Method and apparatus for spectral analysis with high resolution of non stationary signals from an electromagnetic detection system.

摘要

The apparatus consists of a first device (2) for standard short- period sliding spectral analysis, a multi-target Doppler tracking system (3), a device (5) for estimating the target parameters, and a circuit (6) for restoration of a synthesised signal s'(t) whose instantaneous frequency is opposite the theoretical instantaneous frequency from the target. A circuit (8) demodulates the memorised (7) signal s(t) by the synthesised signal s'(t) so as to provide a signal s''(t) which is rendered stationary. Standard long-period (T) spectral analysis (9) is then carried out. A threshold circuit (10) counts the targets. Application especially to the high resolution processing of non- stationary radar signals. <IMAGE>