Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-04-01
1978-02-28
Tubbesing, T.H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5DP, G01S 744
Patent
active
040770389
ABSTRACT:
A digital system for processing return energy in a aircraft pulsed doppler radar system which includes a wave energy transmitter and a receiver for detecting the wave energy returned to the receiver by reflection. A digital signal processor develops target and noise information from the return energy and the return energy related information is supplied to a digital computer. The computer determines the range from which the return energy is reflected and provides digital range data. The width of the return energy in the time domain and the amplitude of the return energy are evaluated to provide digital width and digital amplitude data. The return energy is designated as clutter and clutter AGC and blanking signals are generated to control the receiver in response to an evaluated width and amplitude of the return energy above predetermined minimum values. The return energy is designated as an altitude line and the altitude line designated return energy is tracked in response to a predetermined number of detections of the return energy at about the same range over a predetermined period of time. The altitude line designating and tracking loop has a tracking loop response sufficient to account for changes in terrain beneath the aircraft and for sudden range changes of short duration so that the altitude line is not lost due to changes in the terrain beneath the aircraft. The return energy is designated as a target and the target designated return energy is tracked in response to the range determination, the amplitude determination and an evaluated width of the return energy below the predetermined value.
REFERENCES:
patent: 3646554 (1972-02-01), Fierston et al.
patent: 3720942 (1973-03-01), Wilmot et al.
patent: 3858208 (1974-12-01), Parke et al.
patent: 3987442 (1976-10-01), McLeod, Jr.
Heller Robert I.
McCracken Stephen R.
Schafer Larry C.
Patterson H. W.
Tubbesing T.H.
Westinghouse Electric Corporation
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