Patent ID: 7372399

Claim:
An onboard equipment network system comprising: at least one core device comprising a detecting section for detecting targets by transmitting and receiving signals and generating detection signals or a positioning section for fixing the position of a vehicle by receiving positioning signals from position-fixing satellites and generating position signals representative of the position of the vehicle; and at least one display device for displaying the detection signals or position signals generated by said core device and generating a command signal to set an operating condition of said core device; wherein said core device and said display device are connected to each other by a network and said core device and said display device exchange detection signals or position signals in addition to command signals through the network, and wherein said detecting section comprises: a primary memory for storing on a real-time basis sample values sampled on at least one sweep line; a reference memory for storing the individual sample values derived along the sweep line; and a data buffer controller which compares the individual sample values of each new sweep line read out of the primary memory with sample values previously stored in the reference memory, and if any of the new sample values has a signal intensity differing from that of the previously stored sample value at the same distance from the sweep origin on the same sweep line, causes a transmission data buffer to store update sample value presence data indicating that an update sample value is present, update position data indicating the position of the update sample value on the sweep line, sweep direction data indicating the direction of the sweep line and the update sample value at the position, and if a new sample value has the same signal intensity with the previously stored sample value on the same sweep line, causes the transmission data buffer to store update sample value presence data indicating that no update sample value is present and the sweep direction data once every scan cycle for each pixel; and a display data transmitter for transmitting data content of the transmission data buffer to be displayed by the display device.