Arrangement for location-selective speed measurement based on the Doppler principle

摘要

PCT No. PCT/DE95/00746 Sec. 371 Date Dec. 10, 1996 Sec. 102(e) Date Dec. 10, 1996 PCT Filed Jun. 7, 1995 PCT Pub. No. WO95/34829 PCT Pub. Date Dec. 21, 1995When measuring speed over ground by means of microwave Doppler radar, signal noise, switching spikes and nearby reflectors reduce the measurement accuracy. In order to avoid these disadvantages, a reference signal which recurs with the period T0 and a target signal which follows the reference signal after a time interval Ts are emitted via an antenna. That part of the reference signal which has already been received again during transmission of the target signal is subtracted from the target signal which is received later. The difference signal obtained in this way is a measurement signal from which interference spikes, signal noise and nearby reflectors have been largely removed.