Abstract: A radar signal processor which operates without clutter canceller and AGC circuits by applying an adaptive weighting circuit which adjusts the FFT weighting function on a range gate basis to account for clutter in that range gate. An input buffer determines Log.sub.2 values per range gate for use in the weighting operation and a normalization circuit scales the weighted FFT output to facilitate post-processing.

Abstract: A technique and apparatus are disclosed for determining the performance of a pulse doppler radar system every integration period. The test is accomplished by injecting into the front end of the radar a highly calibrated signal during initialization or during a periodic test and measuring the signal at the Fast Fourier Transform (FFT) output. This measured signal is used by the radar signal processor as a reference signal which is adjusted for internally induced changes by the radar's signal processing system then summed with the in-phase amplitude of the selected range gate filter cell. The sumed signal and the cell quadrature amplitude are then envelope detected, and a detection counter is incremented when the envelope detection compares favorably with the cell's constant false alarm rate. Each integration period, the process is repeated for all range gate filter cells to obtain a detection count. Then the probability of detection is estimated using the equation: ##EQU1## where N.sub.