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Distance measurement using frequency modulated radar - employs corrections for Doppler effects also echo separation techniques
Distance measurement using frequency modulated radar - employs corrections for Doppler effects also echo separation techniques
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机译：使用调频雷达进行距离测量-修正多普勒效应以及回波分离技术
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摘要
Frequency modulated radar techniques are used in distance measuring equipments such as radio altimeters in aircraft. Doppler effects and echo separation effects can be eliminated. A frequency modulated radar system using a common antenna (4) with a circulator (3) transmits the output of an oscillator (1) which has been modulated by a sawtooth waveform from a radial sweep wobbulator (10). This wobbulator controls a pulse generator (13) to delay the start of the sawtooth waveform. It also blocks an amplifier (7) in the receiver and unblocks the doppler measurement amplifier (14) at the mixer (6) output. The signal proportional to speed is applied to a sweep delay (15) circuit for the cathode ray tube thus correcting for doppler effects. The speed of the aircraft is indicated (16).
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