Communications: directive radio wave systems and devices (e.g. – With particular circuit – Digital processing
Patent
1989-04-14
1989-12-05
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Digital processing
342160, 342384, G01S 1300
Patent
active
048855901
ABSTRACT:
A radar system mounted on a moving vehicle uses a displaced phase center antanna (DPCA) and associated processing for taking the difference between the two signals received by the displaced antennas to provide moving target indication (MTI) by cancellation of the returns from stationary targets. The presence of moving targets is identified by threshold processing within discrete frequency bands. DPCA processing ordinarily results in amplitude nulls or "blind speeds" for targets moving at particular radial velocities. According to the invention, the two signals received by the displaced antennas are summed, weighted and divided into frequency bands which extend through the expected null region in a form of Doppler processing. Threshold processing is performed on DPCA processed signals within certain frequency bands outside of the null regions and on Doppler processed signals within other frequency bands, thereby substantially eliminating the blind speeds.
REFERENCES:
patent: 4546355 (1985-10-01), Boles
"An Extension To The Theory Of The Performance Of Airborne Moving-Target Indicators", by Urkowitz, pp. 210-214, of the IEEE Transactions on Aeronautical and Navigational Electronics, Dec., 1958.
"The Effect Of Antenna Patterns On The Performance of Dual-Antenna Radar Airborne Moving Target Indicators", by Urkowitz, pp. 218-223, of the IEEE Transactions On Aerospace and Navigational Electronics, Dec., 1964.
Blum Theodore M.
General Electric Company
Meise William H.
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