Adaptive MTD digital processor for surveillance radar

Details Adaptive MTD digital processor for surveillance radar Adaptive MTD digital processor for surveillance radar

1984-07-16

1987-01-13

Tarcza, Thomas H.

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

Clutter elimination

Mti

G01S 1352

Patent

active

046367934

ABSTRACT:
A digital MTD processor interposed between a coherent video detector and a signal extractor of a surveillance radar comprises a plurality of Doppler filters connected in parallel to the video-detector output, including a zero filter, working into respective modulus extractors connected by way of respective threshold circuits to a common OR gate. Each threshold circuit includes a fixed-threshold comparator and an adaptive-threshold comparator with inputs connected in parallel to the output of the associated modulus extractor, either of these comparators being connectable to the OR gate via a switch controlled with the aid of a rain-clutter map so that the adaptive threshold is used only during exploration of regions with heavy rain. A ground-clutter map, which can be updated on the basis of level measurements performed on the output of the zero filter, controls the selective loading of each Doppler filter with one of three preselected sets of weights depending on the intensity of the ground clutter in the region being explored. Where ground clutter is heavy, the threshold circuit of the zero filter may be cut off from the OR gate. Both the fixed and the adaptive thresholds can be incremented in response to a command from the signal extractor generated upon the occurrence of an excessive number of false alarms.

REFERENCES:
patent: 4375640 (1983-03-01), Harvey
patent: 4463356 (1984-07-01), Short, III et al.
patent: 4488154 (1984-12-01), Ward
Introduction to Radar Systems--Second Edition--Merrill I. Skolnik--pp. 127-129.
MTI Radar--edited by D. Curtis Schleher, Ph.d., pp. 176-182.
"Moving Target Detector, An Improved Signal Processor--C. E. Muehe--pp. 142-145.
Automated Tracking for Aircraft Surveillance Radar Systems--C. E. Muehe--pp. 508-516.
Report No. FAA-RD-80-77--Project Report--ATC-95--II-1-II-7.
Evaluation of the MTD in a High-Clutter Environment--John R. Anderson et al--pp. 219-224.
Sacrifices in Radar Clutter Suppression Due to Compromises in Implementation of Digital Doppler Filters--J. W. Taylor, Jr., pp. 46-50.
On the Azimuthal Accuracy of an FFT-Based Signal Processor for Air Traffic Control Radars--Egidio Cristofalo et al--pp. 8-16, vol. 7n. 1.
The Autogate Circuit in Radar Detection: Analysis and Comparison of Alternative Configurations--Gaspare Galati--pp. 19-29.

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