Abstract:
Provided are an apparatus for searching a distress signal and a controlling method thereof. The apparatus for searching a distress signal includes: a beacon receiver receiving the distress signal transmitted from a distress beacon apparatus of a COSPAS-SARSAT system; a decoder decoding the distress signal to acquire distress information; and a display unit displaying the acquired distress information. The apparatus for searching a distress signal is used by a search and rescue team.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority under 35 U.S.C. §119 to Korean Patent Application No. 10-2009-0114044, filed on Nov. 24, 2009, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
       TECHNICAL FIELD 
       [0002]    The following description relates to a COSPAS-SARSAT system, and more particularly, to an apparatus for searching a distress signal capable of helping a rescue crew to rapidly rescue victims by receiving a distress signal in real time and a controlling method thereof. 
       BACKGROUND 
       [0003]    Recently, a COSPAS-SARSAT system acquiring distress information of ship, aircraft, etc., from a satellite voyaging above Earth, in which a search and rescue apparatus is mounted, is being used to perform searching and rescuing activities. 
         [0004]    In the COSPAS-SARSAT system, ships at sea, mobile terminals on the ground, and aircrafts use distress beacons during distress calls to transmit a 406 MHz emergency beacon signal including locations of distressed terminals, identification numbers of distressed terminals, or the like, every 50 seconds omnidirectionally. Thereafter, the COSPAS-SARSAT satellite receives the transmitted emergency beacon signals and transmits them to a local user terminal (LUT). The LUT extracts distress information from the emergency beacon signal and transmits it to the mission control center (MCC). Next, the mission control center transmits distressed location to a rescue control center (RCC) and the RCC dispatches a search and rescue team to the distressed locations to perform search and rescue. 
         [0005]    However, the emergency beacon signal is transmitted to a search and rescue team via the COSPAS-SARSAT satellite, the LUT, the MCC, and the RCC, such that it takes much time for a search and rescue team to receive distress information. In addition, when communication networks have a problem or the distressed location is changed, a search and rescue team cannot directly recognize the location of distressed beacon, such that it is difficult to save a life. 
       SUMMARY 
       [0006]    In one general aspect, an apparatus for searching a distress signal used by a search and rescue team includes: a beacon receiver receiving the distress signal transmitted from a distress beacon apparatus of a COSPAS-SARSAT system; a decoder decoding the distress signal to acquire distress information; and a display unit displaying the acquired distress information. 
         [0007]    In another general aspect, a controlling method of an apparatus for searching a distress signal used by a search and rescue team may include: receiving the distress signal transmitted from a distress beacon apparatus of a COSPAS-SARSAT system; decoding the distress signal to acquire distress information; and displaying the acquired distress information. 
         [0008]    Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a configuration diagram showing an exemplary COSPAS-SARSAT system; 
           [0010]      FIG. 2  is a configuration diagram showing an exemplary distress signal search apparatus; and 
           [0011]      FIG. 3  is a flow chart showing an exemplary controlling method of the distress signal search apparatus. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0012]    Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals will be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience. The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. Accordingly, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be suggested to those of ordinary skill in the art. Also, descriptions of well-known functions and constructions may be omitted for increased clarity and conciseness. 
         [0013]    Hereinafter, an exemplary embodiment COSPAS-SARSAT system will be described with reference to  FIG. 1 .  FIG. 1  is a configuration diagram showing an exemplary embodiment COSPAS-SARSAT system. 
         [0014]    As shown in  FIG. 1 , an exemplary COSPAS-SARSAT system  10  includes a distress beacon apparatus  110 , a COSPAS-SARSAT satellite  120 , a local user terminal  130 , a mission control center  140 , a rescue control center  150 , a search and rescue team  160 , and a GPS satellite  170 . 
         [0015]    The distress beacon apparatus  110  includes at least one of emergency position indicating radio beacons (EPIRB) that are distress beacons for a ship, personal locator beacon (PLB) that is personal portable distress beacon, and an emergency locator transmitter (ELT) that is a distress beacon for an aircraft. And the distress beacon apparatus  110  transmits a distress signal omnidirectionally for continuous predetermined times (for example, 50 seconds) when the distress occurs. In this case, the distress signal is a signal at 406 MHz band including a location of distressed terminal, an identification number of distressed terminal, etc., and is called an emergency beacon signal. 
         [0016]    The COSPAS-SARSAT satellite  120  receives the distress signal transmitted from the distress beacon apparatus  110  and transmits a distress relaying signal at 1544 MHz band to the local user terminal (LUT) on the ground. 
         [0017]    The local user terminal  130  receives the relaying signal at 1544 MHz band transmitted from the COSPAS-SARSAT satellite  120  and extracts the distress information of the distress beacon apparatus  110  and transmits it to the commission control center  140 . 
         [0018]    The commission control center  140  determines the distressed location from the distressed information transmitted from the local user terminal  130  and transmits it to the rescue control center  150 . 
         [0019]    The rescue control center  150  dispatches the search and rescue team  160  to the distressed location transmitted from the commission control center  140 . 
         [0020]    The search and rescue team  160  is dispatched to the distressed location by the rescue control center  150  to perform search and rescue. In this case, the search and rescue team  160  includes a distress signal search apparatus  200  directly receiving the distress signal from the distress beacon apparatus  110  as well as receiving the distress signal via the COSPAS-SARSAT satellite  120 , the local user terminal  130 , the commission control center  140 , and the rescue control center  150  to determine distressed location. In other words, the search and rescue team  160  executes the distress signal search apparatus  200  after it is ordered to mobilize to directly receive the distress signal from the distress beacon apparatus  110 , thereby making it possible to rapidly perform distress rescuing activities. Components of the distress signal search apparatus  200  will be described in detail with reference to  FIG. 2 . 
         [0021]    The GPS satellite  170  transmits a GPS signal to allow the search and rescue team  160  and the distress beacon apparatus  110 , or the like to determine the present location. 
         [0022]    Hereinafter, the exemplary distress signal search apparatus used by the search and rescue team  160  of the COSPAS-SARSAT system  10  will be described with reference to  FIG. 2 .  FIG. 2  is a configuration diagram showing the exemplary distress signal search apparatus. 
         [0023]    As shown in  FIG. 2 , the exemplary distress signal search apparatus  200  includes a beacon receiver  210 , a decoder  220 , a GPS receiver  250 , a data processor  230 , and a display unit  240 . 
         [0024]    The beacon receiver  210  receives the distress signal transmitted from the distress beacon apparatus  110  and includes an antenna  211 , a low noise amplifier  212 , and a demodulator  213 . In this case, the distress signal is a signal in a frequency band defined in the COSPAS-SARSAT, wherein the frequency band may be a frequency at 406 MHz band (for example, 406.025 MHz, 406.028 MHz, 406.031 MHz, 406.034 MHz, 406.037 MHz, 406.040 MHz, or the like) presently defined. 
         [0025]    That is, the antenna  211  detects the distress signal transmitted from the distress beacon apparatus  110  and the low noise amplifier  212  performs low noise amplification on the distress signal and the demodulator  213  outputs the distress signal from which carrier is removed by demodulation and provides it to the decoder  220 . 
         [0026]    The decoder  220  decodes the distress signal and acquires the distress information of the distress beacon apparatus  110 . In this case, the distress information includes the location of the distress beacon apparatus  110 , the relative direction of the distress beacon apparatus  110  for the present location, the present location, the distance of the distress beacon apparatus  110 , or the like, based on the GPS signal. 
         [0027]    The GPS receiver  250  receives the GPS signal (or navigation signal) transmitted from the GPS satellite  170  and provides it to a data processor  230 . 
         [0028]    The data processor  230  determines the present position of the distress signal search apparatus  200  from the GPS signal and associates the present location with the distress information. And the data processor  230  provides it to the display unit  240 , such that the display unit  240  can display the distress information associated with the present location. 
         [0029]    Hereinafter, an exemplary controlling method of the distress signal search apparatus  200  will be described with reference to  FIG. 3 .  FIG. 3  is a flow chart showing an exemplary controlling method of the distress signal search apparatus. 
         [0030]    Referring to  FIG. 3 , the distress signal search apparatus  200  receives the distress signal transmitted from the distress beacon apparatus  110  of the COSPAS-SARSAT system  10  (S 310 ). In this case, the distress signal is a signal in the frequency band defined in the COSPAS-SARSAT. 
         [0031]    Then, the distress signal search apparatus  200  decodes the distress signal and acquires the distress information (S 320 ). In this case, the distress information may be the location of the distress beacon apparatus  110 , the relative direction of the distress beacon apparatus  110 , the distance of the distress beacon apparatus  110 , or the like. 
         [0032]    Next, the distress signal search apparatus  200  displays the acquired distress information on the display (S 330 ). In this case, the distress signal search apparatus  200  receives the GPS signal from the GPS satellite to determine the present location and associates the present position with the distress information to display. 
         [0033]    In detail, the distress signal search apparatus  200  may display an accurate location of the distress beacon apparatus  110 , the direction of the distress beacon apparatus  110  for the present location, and a spaced distance between the present location and the distress beacon apparatus  110  (by magnifying a map), or the like, based on the GPS signal. 
         [0034]    According to the exemplary embodiments, the search and rescue team can recognize the changed distress information or the distress signal changed after it is ordered to mobilize in real time. Accordingly, it can be better when an emergency rescue should rapidly be performed for example vessel sank especially in the winter or location of victims is changed due to geographic location such as a mountain or a valley, etc. 
         [0000]    A number of exemplary embodiments have been described above. Nevertheless, it will be understood that various modifications may be made. For example, suitable results may be achieved if the described techniques are performed in a different order and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Accordingly, other implementations are within the scope of the following claims.