radar transponder function

Radar transponder is a navigation device that emits a specific coded signal after receiving radar signals. It is used to improve the recognition ability of radar targets. It is often used for the identification and measurement of coastlines without obvious features; the recognition of navigation aids in water and on land. ; Identification of first sighting of land; identification of warning areas and traffic separation system center lines and turning points; identification of dangerous objects not plotted on new charts; identification of navigable bridge openings under bridges; use as guides, etc.

The working principle of the radar transponder is that when the radar transponder receives a frequency signal through the microwave antenna, it passes through the transmitting interface to the circulator of the microwave component and mixes it into an intermediate frequency signal and outputs it to the logarithmic detector and frequency identification component. The frequency, pulse width, and amplitude information of the signal are used through the components to send back the response signal at the same frequency, suppress the radar antenna side-lobe signal, and control the code length (Morse code) of the sent back signal.

Types of radar transponders include Mode A, Mode C, Mode S, etc. Among them, Mode A and Mode C are currently the most widely used in the world. They respond to the four-digit code and air pressure altitude information of the aircraft respectively; Mode S is an emerging one. This mode is also the future development direction. It is a mode that can transmit data links. When it is launched, it not only has the function of C mode, but also can transmit the 24-bit address code of the aircraft and other flight data.

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