Patent Publication Number: US-2022221555-A1

Title: Radar device and mobile platform

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of International Application No. PCT/CN2019/109506, filed Sep. 30, 2019, the entire contents of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure generally relates to the radar structure technology field and, more particularly, to a radar device and a mobile platform. 
     BACKGROUND 
     With the development of science and technology, more and more automation apparatuses are used more and more widely. For example, a radar can be applied in the detection and ranging application fields of unmanned aerial vehicles (UAVs), automobiles, and other industries. The radar is usually configured to detect and perceive obstacles of a surrounding area to effectively avoid the obstacles. 
     However, the radar in the existing technology is generally large and heavy and is not suitable to be applied on a small platform. For example, when being applied to a UAV, the vertical size of the radar is relatively large, which increases the vertical height of the UAV. When the vertical height of the UAV is too high, the flight stability of the UAV will be affected. Moreover, the higher the vertical height of the radar is, the larger a radar cover covering the radar is, and the heavier the weight is, which does not meet a requirement of lightweight. 
     SUMMARY 
     Embodiments of the present disclosure provide a radar device, including a radar base and a radar module. The radar module is mounted at the radar base and configured to rotate relative to the radar base around a rotation axis. The radar module includes an antenna assembly, a signal processing circuit board, and a rotation installation base. The antenna assembly and the signal processing circuit board are arranged oppositely at an interval and jointly enclose to form an accommodation space. The rotation installation base is connected to the antenna assembly and the signal processing circuit board and is located in the accommodation space. The radar base is at least partially located in the accommodation space and arranged opposite to the rotation installation base. 
     The present disclosure provides a radar device and a mobile platform, including a radar base and a radar module. The radar module is rotatably mounted at the radar base. The radar module includes an antenna assembly and a signal processing circuit board arranged at an interval. The antenna assembly and the signal processing circuit board jointly enclose to form an accommodation space. The rotation installation base is connected to the antenna assembly and the signal processing circuit board and located in the accommodation space. The radar base is at least partially located in the accommodation space and arranged opposite to the rotation installation base. By designing a structure with the antenna assembly and the signal processing circuit board of the radar module arranged oppositely at an interval on two sides and accommodating the radar base at least partially in the accommodation space of the radar module, a vertical space may be effectively saved, and an overall size of the radar device and an overall weight of the radar device may be reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to explain the technical solutions of embodiments of the present disclosure more clearly, the drawings needed for describing embodiments will be briefly introduced. Apparently, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings may be obtained from these drawings without any creative effort. 
         FIG. 1  is a schematic cross-sectional structural diagram of a radar device according to some embodiments of the present disclosure. 
         FIG. 2  is a schematic structural diagram of the radar device according to some embodiments of the present disclosure. 
         FIG. 3  is a schematic structural diagram of a radar module according to some embodiments of the present disclosure. 
         FIG. 4  is a schematic cross-sectional structural diagram of the radar device with a radar cover according to some embodiments of the present disclosure. 
         FIG. 5  is a schematic structural diagram showing the radar cover of the radar device according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The technical solutions of embodiments of the present disclosure are described in detail with reference to the accompanying drawings of embodiments of the present disclosure. Apparently, described embodiments are only some embodiments of the present disclosure rather than all embodiments. Based on embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative effort should be within the scope of the present disclosure. 
     Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art of the present disclosure. The terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. 
     The term “including” mentioned in the entire specification and claims is an open term, so the term should be interpreted as “including but not limited to.” “Approximately” means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range to basically achieve the technical effect. 
     In addition, the term “connected” herein includes any direct and indirect connection. Therefore, if in the text a first device is connected to a second device, it means that the first device can be directly connected to the second device or indirectly connected to the second device through another device. 
     The term “and/or” used in the specification is only an association relationship describing associated objects, which means that three relationships may exist. For example, A1 and/or B1 may include three cases that A1 exists alone, A1 and B1 exist at the same time, and B1 exists alone. In addition, the sign “/” in the specification generally indicates that the associated objects before and after are in an “or” relationship. 
     Some embodiments of the present disclosure are described in detail with reference to the accompanying drawings. Where there is no conflict with each other, those skilled in the art can combine and group different embodiments or examples and features of different embodiments or examples described in the specification. In some embodiments, the radar device may emit a detection wave. When the detection wave encounters an obstacle, the detection wave may be reflected and return. The radar device may receive an echo signal to sense the surrounding environment or the obstacle. The radar device of embodiments of the present disclosure may be a laser radar or a microwave radar. A so-called lidar may be a radar system that emits a laser beam to detect a feature measure such as a position, a shape, and a speed of a target. The microwave radar may use a microwave ranging principle to measure the position, shape, and speed of the target. Of course, in other embodiments, those skilled in the art may also implement radar detection by using, for example, an acoustic wave, a wireless wave, etc. Regardless of the detection method used, the smaller the overall size and weight of the radar device are, the more suitable the radar device can be applied to a small system. 
     The radar device provided in embodiments of the present disclosure aims to solve the technical problems that the radar device of the existing technology is too large in size and in weight and is not suitable to be applied to a small system. In some embodiments,  FIG. 1  is a schematic cross-sectional structural diagram of a radar device according to some embodiments of the present disclosure.  FIG. 2  is a schematic structural diagram of the radar device according to some embodiments of the present disclosure.  FIG. 3  is a schematic structural diagram of a radar module according to some embodiments of the present disclosure. 
     With reference to  FIG. 1  to  FIG. 3 , the radar device of embodiments of the present disclosure includes a radar base  10  and a radar module  20 . The radar module  20  is mounted at the radar base  10  and may rotate relative to the radar base  10  around a rotation axis. The rotation axis around which the radar module  20  rotates may be a physical rotation shaft. For example, the radar module  20  may be connected through a rotation drive device such as a motor. The radar module  20  may be connected through a drive shaft of the motor and rotate by using the drive shaft as the rotation shaft. In some other embodiments, the rotation axis around which the radar module  20  rotates may be a virtual rotation axis. For example, the radar module  20  may be connected through a mobile device. The mobile device may be slidably arranged at the radar base  10  and may rotate around a preset rotation axis. By rotatably arranging the radar module  20  at the radar base  10 , the radar device may have more detection directions. When the radar module  20  may rotate 360° or greater than 360° in a circumferential direction, the radar device may realize an omnidirectional detection. No dead detection angle exists. 
     The radar module  20  includes an antenna assembly  21 , a signal processing circuit board  22 , and a rotation installation base  23 . The antenna assembly  21  and the signal processing circuit board  22  may be arranged oppositely at an interval and jointly enclose to form an accommodation space C. The rotation installation base  23  may be connected to the antenna assembly  21  and the signal processing circuit board  22  and located in accommodation space C. The radar base  10  may be at least partially located in accommodation space C and arranged opposite to the rotation installation base  23 . 
     In some embodiments, the antenna assembly  21  and the signal processing circuit board  22  being arranged opposite to each other may mean that overall structural shapes are opposite to each other but not mean that an element of the antenna assembly  21  that emits and receives a detection wave is arranged opposite to the signal processing circuit board  22 . On the contrary, in order to prevent the signal processing circuit board  22  from affecting transmission and reception of the detection wave of the antenna assembly  21 , the element configured to transmit and receive the detection wave at the antenna assembly  21  may be arranged facing away from the signal processing circuit board  22 . Thus, on a travel path of the detection wave, the signal processing circuit board  22  may not block the detection wave, thereby ensuring scanning and detection effects of the antenna assembly  21 . 
     The antenna assembly  21  includes an antenna plate  211  and a radiation sheet arranged at the antenna plate  211 . The antenna plate  211  may be configured as a structure that supports the radiation sheet. The antenna plate  211  may be in a plate shape symmetrical to the signal processing circuit board  22 . The radiation sheet may be attached to the antenna plate  211 . The radiation sheet may be configured to be connected to a power supply. When the radiation sheet is powered by the power supply, the radiation sheet may emit a detection wave. 
     The antenna assembly  21  and the signal processing circuit board  22  may both be in the plate shape to reduce the weight and size of the entire radar device as much as possible. 
     In some embodiments, weights of the antenna assembly  21  and the signal processing circuit board  22  may be substantially the same. Thus, the radar module  20  may be balanced when the radar device  20  rotates. Therefore, the radar base  10  may not generate vibration or shaking, so the stability of the entire radar device may be relatively good. In addition, when the radar device is in a stable state, the ranging of the detection wave may be more accurate, and a detection precision may be higher. 
     In addition, the antenna assembly  21  and the signal processing circuit board  22  may be substantially parallel to each other to reduce the overall size of the radar device as much as possible while ensuring that reasonable accommodation space C is formed between the antenna assembly  21  and the signal processing circuit board  22 . Further, both the antenna assembly  21  and the signal processing circuit board  22  may be parallel to the rotation axis, around which the radar module  20  rotates. The radar base  10  may be in a flat shape to support the radar module  20  stably. The rotation axis may be perpendicular to the radar base  10 . Thus, when the radar module  20  rotates, the radar module  20  may maintain a distance to the radar base  10  unchanged at various rotation angles. 
     The rotation installation base  23  may be parallel to the radar base  10 . The rotation installation base  23  may be located at a position near the top of the antenna assembly  21  and the signal processing circuit board  22 . As such, the antenna assembly  21 , the rotation installation base  23 , the signal processing circuit board  22 , and the radar base  10  may form a large enough accommodation space to accommodate and mount other elements. For example, a drive device is provided for driving the radar module  20  to rotate. The drive device may be accommodated in the accommodation space among the antenna assembly  21 , the rotation installation base  23 , the signal processing circuit board  22 , and the radar base  10 . The overall structure may be compact, and the layout is reasonable, which can effectively save the space. 
     The radar base  10  may be entirely located in accommodation space C or partly located in accommodation space C. When the radar base  10  is entirely accommodated in accommodation space C, a maximum lateral dimension of the radar base  10  may be smaller than a lateral dimension of accommodation space C. When the radar base  10  is partially located in accommodation space C, a lateral dimension of the radar base  10  accommodated in accommodation space C may be smaller than the lateral dimension of accommodation space C. The maximum lateral dimension of the radar base  10  outside accommodation space C may be larger than, smaller than, or equal to the lateral dimension of accommodation space C, which is not limited here. In some embodiments, a maximum cross-sectional dimension of the radar base  10  may be larger than the lateral dimension of the radar module  20 . As such, an orthographic projection of the radar module  20  may be completely located at the radar base  10 . The weight of the radar module  20  may be entirely carried by the radar base  10 , thereby effectively improving the structural stability of the radar device. 
     In some embodiments, as shown in  FIG. 1  and  FIG. 4 , the radar base  10  includes an upper base  10   a  and a lower base  10   b . The upper base  10   a  may extend into accommodation space C. The lower base  10   b  may be located under the radar module  20 . 
     When the radar base  10  is entirely accommodated in accommodation space C, a lateral dimension of the surface supported by the radar base  10  may be smaller than the lateral dimension of the accommodation space C. As such, the surface supported by radar base  10  may be prevented from interfering the radar module  20  when the radar module  20  rotates. 
       FIG. 4  is a schematic cross-sectional structural diagram of the radar device with a radar cover according to embodiments of the present disclosure.  FIG. 5  is a schematic structural diagram showing the radar cover of the radar device according to some embodiments of the present disclosure. As shown in  FIG. 4  and  FIG. 5 , the radar device of embodiments of the present disclosure further includes a radar cover  30 . The radar cover  30  is arranged at the radar base  10 . The radar cover  30  may cooperate with the radar base  10  to enclose to form a space for accommodating the radar module  20 . The radar cover  30  may be cylindrical. An axis of the rotation axis of the radar module  20  may coincide with an axis of the cylindrical radar cover  30 . As such, a size of the radar cover  30  may be reduced as much as possible while the radar cover  30  is ensured not to interfere with the radar module  20 . 
     By arranging the radar cover  30 , the radar module  20  may be protected to prevent the external environment from interfering with the radar module  20 . In some embodiments, for example, external water vapor, dust, etc., can be prevented from being contaminated on the radar module  20  and affecting the sensitivity of the radar module  20 . In addition, the radar cover  30  may also effectively protect the radar module  20  from collisions with external objects to damage the radar module  20 . In order to ensure a normal operation of the radar device, the radar cover  30  should be made of a material that can allow the radar detection wave to pass through, for example, made of a glass fiber composite material. With the radar cover  30 , a service life of the radar device may be effectively extended. 
     When the overall size of the radar device is more compact due to the arrangement, some members of the radar device, such as the radar cover  30 , may be made smaller with the same material, which may effectively reduce the weight of the radar device. 
     The radar device of embodiments of the present disclosure may include the radar base and the radar module. The radar module may be rotatably mounted at the radar base. The radar module may include the antenna assembly and the signal processing circuit board arranged oppositely at an interval. The antenna assembly and the signal processing circuit board may jointly enclose to form an accommodation space. The rotation installation base may be connected to the antenna assembly and the signal processing circuit board and located in the accommodation space. The radar base may be at least partially located in the accommodation space and arranged opposite to the rotation installation base. By designing a structure with the antenna assembly and the signal processing circuit board of the radar module arranged oppositely at an interval on two sides and accommodating the radar base at least partially in the accommodation space of the radar module, a vertical space may be effectively saved, a space stacking may be reduced, and the structure may be compact. Compared with the existing technology that the radar device adopts a technical solution of vertical stacking, the technical solution of embodiments of the present disclosure may reduce the overall size of the radar device and reduce the weight of the radar device. In embodiments of the present disclosure, the radar device is provided. In some embodiments, a power supply and signal transmission method of the radar device and a layout of electronic devices of the radar device are described. The radar module may need to exchange signals with an external apparatus and be stably powered to implement parameter control and signal transmission of the radar module  20 . However, the radar module  20  may constantly rotate during operation, and the external apparatus may be in a fixed position. How to ensure that the radar module  20  can maintain the stable power supply and signal transmission with the external apparatus during rotation and operation is a problem to be solved in embodiments of the present disclosure. 
     As shown in  FIG. 1  or  FIG. 4 , the radar device of embodiments of the present disclosure further includes a wireless power transmission assembly  40  and a wireless power reception assembly  50 . The wireless power transmission assembly  40  may be provided at the radar base  10 . The wireless power reception assembly  50  may be provided at the radar module  20 . The wireless power transmission assembly  40  and the wireless power reception assembly  50  may be wirelessly connected to power the radar module  20 . The wireless power transmission assembly  40  may be connected to an external power source through a cable and powered by the power source, while the wireless power reception assembly  50  is wirelessly connected to the wireless power transmission assembly  40  to transmit electrical power. As such, the radar module  20  may be continuously powered even when rotating, and the rotation of the radar module  20  may not be affected. 
     In other embodiments, the wireless power transmission assembly  40  may be connected to the power supply in a wireless manner. In this case, the wireless power transmission assembly  40  may also rotate with the rotation of the radar module  20 , which is not limited here. 
     In some embodiments, the wireless power transmission assembly  40  includes a first wireless coil  41 . The wireless power reception assembly  50  includes a second wireless coil  51 . The first wireless coil  41  may be coupled to the second wireless coil  51 . The first wireless coil  41  and the second wireless coil  51  may be charged through electromagnetic induction between the first wireless coil  41  and the second wireless coil  51 . The electrical power may be transmitted between the first wireless coil  41  and the second wireless coil  51 . When an alternating current passes through the first wireless coil  41 , an alternating magnetic flux may be generated between the first wireless coil  41  and the second wireless coil  51 . Thus, an induction voltage varying with the magnetic flux may be generated in the second wireless coil  51  to generate a current. 
     In other embodiments, the wireless power transmission assembly  40  and the wireless power reception assembly  50  may transmit the electrical power in a magnetic resonance method and a microwave method. 
     In some embodiments, both axes of the first wireless coil  41  and the second wireless coil  51  may substantially coincide with the rotation axis of the radar module  20 . Thus, when the first wireless coil  41  is fixed, and the second wireless coil  51  rotates with the rotation of the radar module  20 , the axis of the second wireless coil  51  and the axis of the first wireless coil  41  may be coaxial at all times. The rotation of the radar module  20  may not affect a coupling state between the first wireless coil  41  and the second wireless coil  51 . A continuously and stable power supply may exist between the first wireless coil  41  and the second wireless coil  51 . 
     In some embodiments, the wireless power transmission assembly  40  further includes a first coil bracket  42 . The first wireless coil  41  may be fixed at the first coil bracket  42 . The wireless power reception assembly  50  further includes a second coil bracket  52 . The second wireless coil  51  may be fixed at the second coil bracket  52 . The first wireless coil  41  may be located on a side of the first coil bracket  42  facing the wireless power reception assembly  50 . The second wireless coil  51  may be located on a side of the second coil bracket  52  facing the wireless power transmission assembly  40 . Thus, a distance between the first wireless coil  41  and the second wireless coil  51  may be relatively small, the electromagnetic induction between the first wireless coil  41  and the second wireless coil  51  may not be affected by other members, and the transmission effect may be good. 
     The radar device provided by embodiments of the present disclosure further includes a first signal assembly  60  and a second signal assembly  70 . The first signal assembly  60  may be arranged at the radar base  10  and communicatively connected to an external apparatus. The second signal assembly  70  may be arranged at the radar module  20 . The first signal assembly  60  and the second signal assembly  70  may be wirelessly connected to establish a wireless communication connection between the radar module  20  and the external apparatus. The first signal assembly  60  may be connected to the external apparatus through a cable or wirelessly to receive a control signal of the external apparatus. The radar module  20  may communicate with the external apparatus through the first signal assembly  60  and the second signal assembly  70  to connect the external device to transmit the control signal of the external apparatus to the radar module  20  and transmit a radar data signal of the radar module  20  to the external apparatus. Thus, the signal transmission between the external apparatus and the radar module  20  may be realized. The control signal of the external apparatus may be transmitted to the radar module  20  to control the radar module  20 . The radar data signal of the radar module  20  may be transmitted to the external apparatus. 
     The first signal assembly  60  includes a first transmission antenna  61 . The second signal assembly  70  includes a second transmission antenna  71 . The first transmission antenna  61  may be coupled to the second transmission antenna  71 . The first transmission antenna  61  and the second transmission antenna  71  may be linear. Axes of the first transmission antenna  61  and the second transmission antenna  71  may substantially coincide with the rotation axis of the radar module  20 . As such, when the second transmission antenna  71  follows the radar module  20  to rotate, a relative position of the first transmission antenna  61  and the second transmission antenna  71  may not change. The first transmission antenna  61  and the second transmission antenna  71  may always maintain a stable coupled state. The rotation of the radar module  20  may not affect the communication between the radar module  20  and the external apparatus. 
     In other embodiments, wireless transmission between the first signal assembly  60  and the second signal assembly  70  may be implemented through WiFi, Bluetooth, etc. 
     In other embodiments, when requirement for a detection range of the radar device is not high, the power supply and signal transmission of the radar module  20  may also use a wired transmission method. A wiring path of a power supply cable and a signal transmission cable of the radar module  20  may substantially coincide with the axis of the rotation shaft of the radar module  20 . Thus, when the radar module  20  rotates, the cables may not generate an excessive twist, and wire disturbance may be relatively small, which may not have a big impact on the power supply and the signal transmission of the radar module  20 . 
     In addition, the radar base  10  is provided with a base circuit module  80  configured to be electrically connected to the external apparatus. In some embodiments, an accommodation chamber  101  is formed in the radar base  10 . The base circuit module  80  may be arranged in the accommodation chamber  101  to further save space. The wireless power transmission assembly  40  and the first signal assembly  60  may be electrically connected to the base circuit module  80 . The base circuit module  80  may supply power to any device in the radar device that needs to be powered. For example, the base circuit module  80  may also supply power to the drive device such as the motor that drives the radar module  20  to rotate. When the radar base  10  has the upper base  10   a  and the lower base  10   b , the lower base  10   b  may include a top cover  11   b  and a base body  12   b  that are detachably connected to each other. The top cover  11   b  and the base body  12   b  may enclose to form the accommodation chamber  101 . The base circuit module  80  may be located in the accommodation chamber  101 , the top cover  11   b  may be detached from the base body  12   b  to expose the base circuit module  80 , which may facilitate replacement or maintenance of devices of the base circuit module  80 . The base circuit module  80  may have good flexibility. 
     In some embodiments, the radar device further includes a signal transmission module  231  and a signal processing module  221 . The signal transmission module  231  may be electrically connected to the antenna assembly  21 , the signal processing module  221 , the wireless power reception assembly  50 , and the second signal assembly  70 . The signal transmission module  231  may receive the radar data signal of the radar module  20  and send the radar data signal and/or the control signal of the external apparatus to the signal processing module  231  for processing. The signal transmission module  231  may be powered by the wireless power reception assembly  50 . The signal transmission module  231  may transmit the control signal of the external apparatus through the second signal assembly  70 . In some embodiments, the wireless power reception assembly  50  may be electrically connected to an end of the second signal assembly  70 . Another end of the second signal assembly  70  may be electrically connected to the signal transmission module  231 . The signal transmission module  231  may be electrically connected to the signal processing module  221 . 
     In some embodiments, the signal transmission module  231  may be arranged at the rotation installation base  30 . The signal processing module  231  may be arranged at the signal processing circuit board  22 . In order to ensure the balance of the radar module  20  to cause the force of the radar module  20  to be balanced during rotation, the weight of the signal processing circuit board  22  may be equal to the weight of the antenna assembly  21 . Thus, the size of the signal processing circuit board  22  may be also limited. The signal transmission module  231  and the signal processing module  221  cannot be arranged together in the limited space of the signal processing circuit board  22 . Therefore, the signal transmission module  231  may be arranged in the rotation installation base  23  connected between the antenna assembly  21  and the signal processing circuit board  22 . Such a layout is reasonable and can effectively save space. The overall size of the radar device may be reduced. 
     In some embodiments, the motor is further provided and configured to drive the radar module  20  to rotate. The motor includes a stator  2011  and a rotor  2012  rotatable relative to the stator  2011 . The radar module  20  may be fixedly connected to the rotor  2012 . The stator  2011  may be fixed to the radar base  10 . The rotor  2012  may rotate synchronously with the rotation shaft. When the motor drives, the rotor  2012  may continuously rotate to drive the radar module  20  to rotate. In some embodiments, the rotor  2012  of the motor may be controlled to rotate clockwise or counterclockwise to control the radar module  20  to rotate clockwise or counterclockwise. When the rotation angle is greater than or equal to 360°, the omnidirectional multi-angle detection may be realized. 
     A housing  11  may be arranged at an upper portion of the radar base  10 . The stator  2011  may be fixed to the housing  11 . Both wireless power transmission assembly  40  and wireless power reception assembly  50  may be located in the housing  11 . The wireless power transmission assembly  40  may be fixed to the housing  11 . The wireless power reception assembly  50  may be fixedly connected to the rotor  2012 . Therefore, when the rotor  2012  rotates, the rotor  2012  drives the wireless power reception assembly  50  to rotate. The wireless power transmission assembly  40  and the wireless power reception assembly  50  may be arranged in the housing  11 . An inner chamber  110  may be formed in the housing  11 . The wireless power transmission assembly  40  and the wireless power reception assembly  50  may be arranged in the inner chamber  110 . The housing  11  may protect the wireless power transmission assembly  40  and the wireless power reception assembly  50  to prevent the radar module  20  from affecting the wireless power transmission assembly  40  and the wireless power reception assembly  50  during rotation. 
     A top of the housing  11  may have an opening. The stator  2011  may be fixed to the top of the housing  11  and block the top opening. The stator  2011  may be detachably connected to the top opening of the housing  11 . The stator  2011  may seal the housing  11  to prevent dust and water vapor from entering the wireless power transmission assembly  40  and the wireless power reception assembly  50  to affect the power transmission between the wireless power transmission assembly  40  and the wireless power reception assembly  50  or damage wireless power transmission assembly  40  and the wireless power reception assembly  50 . A sealed chamber may be formed inside the housing  11 . The stator  2011  may be fixedly connected to the housing  11 . The wireless power transmission assembly  40  and the wireless power reception assembly  50  may be arranged in the inner chamber  110 , which is not limited here. 
     The rotor  2012  may be located above the housing  11  and fixed under the rotation installation base  23 . The layout may be compact and reasonable. The distance among the rotor  2012 , the rotation installation base  23 , and the housing  11  may be as small as possible to cause the structure to be as compact as possible. 
     The rotor  2012  may be fixedly provided with a rotor bracket  2012   a . The rotor bracket  2012   a  may extend into the housing  11 . The wireless power reception assembly  50  may be arranged at the rotor bracket  2012   a . The rotor bracket  2012   a  may extend into the housing  11  and be fixedly connected to the second coil bracket  52  through the rotor bracket  2012   a . When the rotor  2012  rotates, the rotor bracket  2012   a  may drive the second coil bracket  52  and the second wireless coil  51  connected to the rotor bracket  2012   a  to rotate. 
     The rotor support  2012   a  may include a hollow rotor shaft X. The second signal assembly  70  may be arranged in the hollow rotor shaft X. The stator  2011  may be sleeved at the outside of one end of the hollow rotor shaft X. Thus, the hollow rotor shaft X may extend into the inner chamber  110  of the housing  11 . The axis of the second signal assembly  70  may coincide with an axis of the hollow rotor shaft X. By arranging the second signal assembly  70  in the hollow rotor shaft X, on one hand, the second signal assembly  70  can be protected, and on another hand, space can be effectively saved to realize a reasonable layout. Furthermore, it is beneficial to ensure the axis of the second signal assembly  70  to coincide with the axis of the hollow rotor shaft X. As such, when the radar module  20  rotates, the wireless communication connection between the first signal assembly  60  and the second signal assembly  70  may not be affected. Based on above, in some embodiments, as shown in  FIG. 2 , a plurality of blades S are distributed and arranged at a first sidewall of the antenna plate  211  and/or at a second sidewall of the signal processing circuit board  22 . The plurality of blades S may be configured to cut the air to accelerate the air to flow to form a heat dissipation airflow when the radar module  20  rotates. The first sidewall may be arranged opposite to the second sidewall. 
     The first sidewall may be a side of the antenna assembly  21  facing away from the radiation sheet. By arranging the blades S, when the radar module  20  rotates, the plurality of blades S may form a heat dissipation airflow similar to a fan to accelerate the airflow and dissipate the heat of the radar module  20 . Thus, the heat dissipation effect of the radar device may be effectively improved, and the service life of the radar device may be improved. 
     The blades S may be arranged inclined from top to bottom. An inclination angle of each blade S may be same or different. An inclination direction of each blade may be generally inclined from top to bottom. Thus, when the radar module  20  rotates, a vertically rising heat dissipation airflow can be generated. When the airflow flows upward, members such as the radar base  10  may not block the airflow. Thus, the heat dissipation effect may be further improved. In some embodiments, a mobile platform is provided. The mobile platform of embodiments of the present disclosure may include an unmanned aerial vehicle (UAV), an automobile, and another mobile apparatus. In some embodiments, the mobile platform may include a body and a radar device arranged at the body. The radar device may include the radar base  10  and the radar module  20 . 
     The mobile platform as the UAV may be taken as an example. The UAV may generally include a body and an arm. The antenna assembly  21  of the radar device may be arranged at the body facing away from the body to prevent the body from blocking the detection wave emitted by the antenna assembly  21 . In some embodiments, the radar device may also be arranged at the arm. The radar device may be arranged according to specific needs, which is not limited here. 
     The radar module  20  may be mounted at the radar base  10  and rotate relative to the radar base  10  around a rotation axis. The rotation axis around which the radar module  20  rotates may be a physical rotation shaft. For example, the radar module  20  may be connected through a rotation drive device such as a motor. The radar module  20  may be connected by a drive shaft of the motor and rotate around the drive shaft by using the drive shaft as the rotation shaft. In some other embodiments, the rotation axis around which the radar module  20  rotates may be a virtual rotation shaft. For example, the radar module  20  can be connected through a mobile device. The mobile device may be slidably arranged at the radar base  10  and rotate around a preset rotation axis. By rotatably arranging the radar module  20  at the radar base  10 , the radar device may have more detection directions. When the radar module  20  rotates 360° or greater than 360° in the circumferential direction, the radar device may realize the omnidirectional detection, and no dead detection angle may exist. 
     The radar module  20  may include the antenna assembly  21 , the signal processing circuit board  22 , and the rotation installation base  23 . The antenna assembly  21  and the signal processing circuit board  22  may be arranged oppositely at an interval and jointly enclose to form accommodation space C. The rotation installation base  23  may be connected to the antenna assembly  21  and the signal processing circuit board  22  are located in accommodation space C. The radar base  10  may be at least partially located in accommodation space C and arranged opposite to the rotation installation base  23 . 
     The structure and function of the radar device in the mobile platform of embodiments of the present disclosure may be the same as those of embodiment one. For details, reference may be made to the above description, which is not repeated here. 
     The mobile platform of embodiments of the present disclosure may include a radar device. The radar device may include the radar base and the radar module. The radar module may be rotatably mounted at the radar base. The radar module may include the antenna assembly and the signal processing circuit board that are arranged oppositely at an interval. The antenna assembly and the signal processing circuit board may jointly enclose to form an accommodation space. The rotation installation base may be connected to the antenna assembly and the signal processing circuit board and located in the accommodation space. The radar base may be at least partially located in the accommodation space and arranged opposite to the rotation installation base. By designing a structure with the antenna assembly and signal the processing circuit board of the radar module arranged oppositely at an interval on two sides and accommodating the radar base at least partially in the accommodation space of the radar module, the vertical space may be effectively saved, a space stacking may be reduced, and the structure may be compact. Compared with the technical solution of the existing technology that the radar device is stacked vertically, the technical solution of embodiments of the present disclosure may reduce the overall size of the radar device and reduce the weight of the radar device. Thus, the overall weight of the mobile platform may be reduced. Especially, when the mobile platform is the UAV, the weight of the UAV may be effectively reduced to improve the lightweight degree of the UAV to satisfy the requirement of the small UAV. 
     In embodiments of the present disclosure, the displayed or discussed mutual coupling, direct coupling, or communication connection may be indirect coupling or communication connection through some interfaces, devices, or units and may be electrical, mechanical, or another form. 
     Finally, the above embodiments are only used to illustrate the technical solutions of the present disclosure, not to limit the technical solutions. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that modifications may still be made to the technical solutions recorded in the foregoing embodiments, or equivalent replacements may be performed on some or all of the technical features. These modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of embodiments of the present disclosure.