MTI Velocity discriminator

Details MTI Velocity discriminator MTI Velocity discriminator

1982-08-10

1985-07-16

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7A, G01S 1352

Patent

active

045299854

ABSTRACT:
A digital Moving Target Indicator (MTI) radar system for rejection of low velocity "clutter" by utilizing techniques to identify those radar echo returns from targets having radial velocities lower than fixed predetermined values. For digital MTI radars that have a response which is a periodic function of the radar's Pulse Repetition Frequency (PRF) and doppler frequency shift of the received radar signal relationships exist whereby (a) optimum target velocities which correspond to the maximum canceler gain can be calculated from the radar's PRF; (b) the canceler response can be expressed in terms of a periodic canceler response function which incorporates the ratio of the actual target velocity to the optimum target velocity; and, (c) the output amplitude from the canceler can be determined from the input amplitude to the canceler produced by the MTI receiver's coherent phase detector and the periodic canceler response function. Thus, for a particular target velocity and a number of different input amplitudes the corresponding output amplitudes from the canceler are calculated. These canceler output amplitudes are stored in an electronic memory which is accessed in terms of the input amplitude produced by the coherent phase detector. The canceler output amplitude read from the memory is compared with the actual canceler output to determine whether the output should be treated as clutter or a target having a radial velocity greater than the preselected fixed value.

REFERENCES:
patent: 3417396 (1968-12-01), Stifter et al.
patent: 3775768 (1973-11-01), Lisle et al.
patent: 3787851 (1974-01-01), Hughes
patent: 3902174 (1975-08-01), Siegel
patent: 3972041 (1976-07-01), Howard
patent: 4049953 (1977-09-01), Evans, Jr.
patent: 4057800 (1977-11-01), Ganz
patent: 4093948 (1978-06-01), Long, III
patent: 4117538 (1978-09-01), Shrader et al.

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