Short-distance target detection radar based on stepped frequency signals
A frequency stepping, close-range technology, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc. Imaging effects, increased sensitivity, easy-to-handle effects
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[0030] Such as figure 1 As shown, the antenna adopts the method of sending and receiving separately, one antenna is used to send the detection signal, and the other antenna is used to receive the scattered echo signal of the target. The antenna is a wideband shaped beam antenna with a beam width of 2 degrees in azimuth and a cosecant square form of elevation beam. During implementation, the antenna rotates periodically in the azimuth direction at a rotation speed of 10 revolutions per minute to achieve scanning in all azimuths, with a fixed pitch angle, and the shaped beam can ensure the detection of targets at different heights.
[0031] The detection signal sent each time is a single-frequency continuous wave. The frequency stepping method is used to send the detection signal, such as figure 2 shown. The number of times the probe signal is transmitted is the frequency number of the probe signal N=B / Δf, where B is the frequency bandwidth, and Δf is the frequency step size...
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