Anti-helicopter weapon system radar for e.g. aircraft, has transmitter to transmit phase coded wave, and section to perform Fast Fourier Transform on signal so that output is Discrete Fourier Transformed to detect glares of helicopter blade

摘要

The radar has a transmitter to transmit a wave coded in phase, and a section, during reception, to filter the transmitted code. A section performs Fast Fourier Transform (FFT) on the received signal, during `n` successive recurrences, to realize Doppler filtering. Movable echoes are recognized from fixed echoes on the filter output. The FFT output is subjected to Discrete Fourier Transform to detect the glares of helicopter blades. An independent claim is also included for an anti-helicopter weapon system.