Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1992-01-21
1992-12-22
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342 36, 342 39, 342101, 342132, 342135, 342136, 342140, 342162, 342195, G01S 1318, G01S 1328, G01S 1342
Patent
active
051737060
ABSTRACT:
A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with .+-.45.degree. coverage in azimuth, from 0.degree. to 60.degree. in elevation. Each antenna element of each phased-array antenna is coupled by a low-loss path to the solid-state amplifier associated with a transmit-receive (TR) module. Each antenna produces a sequenc of pencil beams, which requires less transmitted power from the TR modules than a fan beam, but requires more time beacuse the pencil beam must be sequenced to cover the same volume as the fan beam. In order to scan the volume in a short time, the PRF is responsive to the elevation angle of the beam, so higher elevation angles use a higher PRF. Low elevation angle beams receive long transmitter pulses for high power, and pulse compression is used to restore range resolution, but the long pulse results in a large minimum range within which targets cannot be detected. A second scan is provided at low elevation angles with a short transmitter pulse to fill in the short-range coverage. Beams at higher elevation angles transmit pulse widths which are shorter than beams at low elevation angles, so that the minimum range requirement is met without a second scan, which also reduces the time required for volumetric scan. The number of pulses which are integrated to produce a return increases off-axis, to restore system margin lost due to off-axis power gain reduction. The volumetric scan rate is increased by a dynamic scan regimen by which subsets of beams are pulsed with a high transmitter PRF but with a low effective beam PRF to reduce range ambiguity and preserve Doppler resolution without the usual increase of scan time. For best range resolution, Doppler processing is used, with range sidelobe pulse suppression applied separetely to each Doppler frequency bin.
REFERENCES:
patent: 3032757 (1962-05-01), Majerus et al.
patent: 3173138 (1965-03-01), Erst
patent: 3427617 (1969-02-01), Richman
patent: 3680090 (1972-07-01), Bishop
patent: 3896434 (1975-07-01), Sirven
patent: 4236140 (1980-11-01), Aker et al.
patent: 4827263 (1989-05-01), Jones et al.
patent: 4894660 (1990-01-01), Thompson et al.
patent: 4960329 (1990-10-01), Schofield
patent: 5047784 (1991-09-01), Gerlach et al.
patent: 5070337 (1991-12-01), Chen et al.
General Electric Company
Meise William H.
Nieves Carlos A.
Sotomayor John B.
Young Stephen A.
LandOfFree
Radar processor with range sidelobe reduction following doppler does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radar processor with range sidelobe reduction following doppler , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radar processor with range sidelobe reduction following doppler will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-977058