Suppressor of second-time-around clutter echoes for MTI pulse ra

Details Suppressor of second-time-around clutter echoes for MTI pulse ra Suppressor of second-time-around clutter echoes for MTI pulse ra

1984-05-04

1986-12-16

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

G01S 728

Patent

active

046300520

ABSTRACT:
A device for suppressing second-time-around echoes from far-out clutter in an MTI pulse radar lies in shunt with a digital signal processor connected to the receiver output of the radar whose transmitter includes a power oscillator maintaining phase coherence only for the duration of an outgoing pulse. In order to minimize the occurrence of blind speeds, the oscillator is triggered for different pulse-repetition frequencies of predetermined values in alternate scanning intervals each lasting for an antenna rotation by half a beamwidth. Echoes from a group of radar pulses emitted in one interval are accumulated and then compared in magnitude with accumulated echoes from another such group emitted in an adjoining interval. If these magnitudes--relatively adjusted to compensate for the different numbers of pulses per group--are substantially equal over a sequence of antenna revolutions, they are classified as due to second-time-around clutter echoes and the output signal of the processor is eliminated for the corresponding scanning intervals.

REFERENCES:
patent: 3023409 (1962-02-01), Smith et al.
patent: 3312969 (1967-04-01), Halsted
patent: 3706990 (1972-12-01), Carre 343 7.7
Introduction to Radar Systems-Second Edition-Merrill Skolnik, pp. 2, 3, 105, 106, 114, 117, 119, 139.
On the Aximuthal Accuracy of an FFT-Based Signal Process for Air Traffic Control Radars-E. Cristofalo et al-pp. 8-15, "Revista Tecnica Selenia" (vol. 7, No. 1).

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