Systolic Architecture of Adaptive Post Detection Integration CFAR Processor in Binomial Distribution Pulse Jamming

Abstract

Abstract.A new parallel algorithm for signal processing and a parallel systolic architecture of a CFAR processor with adaptive censoring and post detection integration (API) are presented in the paper. The processor proposed is used for target detection when echoes from targets are performed in conditions of binomial distribution pulse jamming. The property of the algorithm proposed is its ability automatically to determine and censor the unwanted samples corrupted by pulse jamming in both, the two-dimensional reference window and the test cell, before noise level estimation. In case of binomial distribution pulse jamming for big repetition frequency, the censoring capabilities of the algorithm offered from Behar is small and the probability of false alarm is not constant. We offer the vector at the output of the reference window to be sorted and censored again. In such a way the influence of pulse jamming environment over adaptive threshold is reduced to minimum. The systolic architecture of the API CFAR is designed. Computational losses of the systolic architecture are estimated as a number of processor elements and computational steps needed for real-time implementation.

Systolic Architecture for Adaptive Censoring CFAR PI Detector

“…The suggested statistical algorithm for a RACPI CFAR detector is in fact a further development of the results achieved in [4,5]. The proposed new systolic architecture allows its calculating structure to follow closely the statistical algoritm, which leads to increased quality of detection and keeping constant false alarm probability.…”

“…Censoring of the randomly arriving interference impulses both, in the test resolution cells and the reference cells, is used. Garvanov proposes in [5] a new modification of the parallel algorithm presented in [4]. This algorithm works successfully in the presence of total interference (thermal noise plus pulse jamming) that is binominal distributed according to the compound exponential law [6], with unknown average repetition frequency and magnitude.…”

“…When the probability for the appearance of impulse interference is high, the censoring algorithm, proposed in [3], is unsatisfactory [5,7,8]. In such a case the ACPI CFAR processor does not keep constant the false alarm probability, as it is in [3].…”

“…The proposed new systolic architecture allows its calculating structure to follow closely the statistical algoritm, which leads to increased quality of detection and keeping constant false alarm probability. This new algorithm is compared to the similar algorithms, presented in [4,5] as they all solve the same problem, for the number of the calculating steps and the number of PE elements used. The new algorithm is not compared to algorithms proposed by other authors, because they are different and do not refer to the same task.…”

“…There are systolic structures of sorting algorithms for different types of CFAR detectors. However, the most suitable for comparison in our case are the algorithms presented in [4,5].…”