Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1991-08-28
1993-03-02
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342108, 342115, 342 99, 342196, G01S 1353
Patent
active
051913470
ABSTRACT:
A pulsed Doppler radar system comprises a transmitter for generating and transmitting a pulse signal having expanded frequency bandwidth, an antenna apparatus for sending the output of the transmitter to a target and for receiving a signal which was sent by the transmitter and reflected by the target, a receiver for processing the received signal to obtain a complex video signal, a pulse compressing circuit including a pulse Doppler processor responsive to the complex video signal for detecting a relative speed of the target and a storage device for storing a reference signal which includes a compensation factor by which an influence of the Doppler effect is compensated in accordance with the speed of the target. The pulse compressing circuit is operative to correlate the output of the pulse Doppler processor with the reference signal so as to convert the complex video signal to a signal having a narrow pulse width, a detector for performing envelope detection on the narrow pulse width signal, and a display responsive to the output of the detector for displaying a detected target thereon.
REFERENCES:
patent: 3745571 (1973-07-01), Chwastyk et al.
patent: 4003054 (1977-01-01), Goldstone
patent: 4042925 (1977-08-01), Albanese et al.
patent: 4876547 (1989-10-01), Franco
patent: 4914441 (1990-04-01), Brookner
Fujisaka Takahiko
Ishikawa Sachiko
Oh-Hashi Yoshimasa
Mitsubishi Denki & Kabushiki Kaisha
Sotomayor John B.
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