System for obtaining summarised information on the line spectrum provided by the spectrum analyser of a Doppler radar

摘要

The system comprises a demultiplexer 21, a series-parallel transformer 22 and two encoders 25, 26 for determining a target detection signal D and the position G, F of the first and last logical levels I of the elementary raw plot PBE. An adding circuit 29, two comparators 27, 30, a counter 23 and an AND gate 31 make it possible to produce a signal indicating whether the target has a uniform speed V. An arithmetic and logic unit 28 and an exclusive OR gate 32 determine the spectral estimate ES of the target, and a counter 24 gives the spectral bandwidth SP of the radar cells. Application to Doppler radars. <IMAGE>