Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Transmitter
Patent
1990-09-18
1992-02-11
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Transmitter
342 81, 342372, G01S 1300
Patent
active
050879170
ABSTRACT:
A radar system having a phased array antenna for transmission and a digital beam forming antenna for reception for observing a plurality of targets by transmitting transmission pulses to the respective targets comprises a subtraction control circuit, a transmission timing control circuit and a transmission beam direction control circuit. The substraction control circuit calculates a required number of transmission pulses (beams) to be transmitted for each of transmission cycles in accordance with detected Doppler frequencies of the targets, so as not to cause ambiguity on the detected Doppler frequencies, and determines a beam direction for each of transmission beams. The timing control circuit and beam direction control circuit control transmission timing and direction of the beams.
REFERENCES:
patent: 4656479 (1987-03-01), Kirimoto et al.
patent: 4724438 (1988-02-01), Arnold et al.
patent: 4868574 (1989-09-01), Raab
patent: 4924235 (1990-05-01), Fujsaka
Ruvin et al, "Digital Multiple Beamforming Techniques for Radar", Eason, 1978.
U.S. Application Ser. 07/450,290 filed Dec. 13, 1989, Kirimoto, et al.
Fujisaka Takahiko
Kirimoto Tetsuo
Kondo Michimasa
Oh-Hashi Yoshimasa
Hellner Mark
Mitsubishi Denki & Kabushiki Kaisha
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