Anordnung zur ortsselektiven Geschwindigkeitsmessung nach dem Doppler-Prinzip

摘要

When measuring speed above ground using microwave Doppler radar, the measurement accuracy is impaired by signal noise, switching spikes and reflections from close-lying reflectors. In order to avoid these disadvantages, the invention calls for a reference signal recurring with a period T0 and a target signal following a time TS after the reference signal to be emitted by the antenna. The part of the reference signal received during emission of the target signal is substracted from the subsequently received target signal. The difference signal thus obtained as the measurement signal is largely free from interference spikes, signal noise and reflections from close-lying reflectors.