Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Radar mounted on and controls land vehicle
Patent
1991-08-16
1993-01-19
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Radar mounted on and controls land vehicle
342101, 342114, G01S 1393, G01S 1362
Patent
active
051810387
ABSTRACT:
A Doppler control circuit for a CW or pulse Doppler radar system for monitoring not only the phase shift between echo signals from several targets but also the amplitude difference between the several targets and to further tune the radar to a particular target among one or more targets from which echo signals return. The control circuit can be used in state of the art CW or pulse Doppler type radar systems. In a further system, a continuously generated radar signal is repeatedly transmitted at different frequencies in time division fashion to define a succession of transmit and receive frames. The receive frames are divided into a plurality of time interval windows with selected windows being used to detect received signals at the different frequencies. The remaining windows can be used for subsystems of the radar system. The rate of phase shift of received signals at a reference frequency is used to determine closing rate (positive or negative), while the phase shift difference between received signals at two frequencies is used to determine range and target direction. A target persistence and environment filter prevents the radar system from giving false alarms due to short duration target echoes resulting from birds or wayside objects.
REFERENCES:
patent: 3582870 (1971-06-01), Peterson et al.
patent: 3702998 (1972-11-01), Lucas
patent: 3967283 (1976-06-01), Clark et al.
patent: 4549181 (1985-10-01), Tachibana et al.
patent: 4845682 (1989-07-01), Boozer et al.
Asbury Jimmie
Davis John W.
Barron Jr. Gilberto
IVHS Technologies, Inc.
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