Performance of a Correlation-Sensitive Radar Detection Technique.

摘要

The double threshold method of automatic radar target detection is used in the Common Digitizer to detect targets in the search radar video. While the performance of this method is acceptable in clear areas, the number of false alarms in weather clutter has been found to be excessive. A modification which results in an increased capability to discriminate between weather clutter and aircraft targets is suggested. The modification is an adaptive procedure for adjusting the second threshold level based on both the probability of the first threshold output and the azimuthal correlation between adjacent sweeps. Correlation in weather clutter has been identified as the prime cause for the failure of the present method to yield a constant false alarm rate. The probability and correlation of the first threshold output are estimated by counting the number of hits and the number of sequential pairs of hits in azimuth in a moving zone surrounding the cell of interest.