Time multiplexer for high prf pulse doppler radar

Claim 1

A digital time multiplexer for converting a plurality of pulse doppler radar receiver output CW signals which appear simultaneously in a pulse doppler radar system into a corresponding plurality of sequential signals for analysis by a single doppler filter bank, comprising, in combination: a synchronizer circuit providing outputs comprising time related control signals; circuits means coupled to and operated by said synchronizer for selectively sampling all of said plurality of CW signals; a plurality of signal output lines coupled from said circuit means; first signal converter means coupled to each of said plurality of signal output lines generating a digital representation of the respective CW signal appearing on said plurality of output lines; a digital memory coupled to and operated by said synchronizer and adapted to temporarily store said digital representations in a predetermined order; a multiplexer circuit coupled between said first signal converter means and said memory and operated by said synchronizer for selectively coupling said digital representations into said memory on a time shared basis, said synchronizer then effecting a predetermined sequential read-out of said digital representations; second signal converter means coupled to said memory for reconverting said digital representations in sequential timed relationship into reconstructed representations of said receiver output CW signals; and means coupling said second signal converter means to said doppler filter bank wherein said reconstructed output CW signals appearing in sequential timed relation are fed thereto for spectral analysis of the doppler band.