Demodulating integrator/demultiplexer

Details Demodulating integrator/demultiplexer Demodulating integrator/demultiplexer

1996-08-02

1997-12-30

Pihulic, Daniel T.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

Complex signal

342195, G01S 730

Patent

active

057035962

ABSTRACT:
A radar digital IF (intermediate-frequency) signal is to be complex demodulated, then processed through a two-channel real lowpass filter, prior to Doppler correction, clutter filtering, and other usual processing steps. A particularly efficient form of lowpass filtering for such applications is the so-called CIC (cascaded integrator/comb) filter. The first stage of such a filter is always an integrator. A conventional mechanization would therefore feature a conventional complex demodulator followed by an accumulator on each of the two demodulator outputs, followed by more processing. This invention more efficiently mechanizes this function by replacing the usual pair of multipliers and pair of accumulators (or integrators) with a single two-delay (54, 58) accumulator having an add/subtract control (48) on the input adder (42), and a pair of multiplexer switches (62, 66).

REFERENCES:
patent: 4667200 (1987-05-01), Gellekink et al.
patent: 5369411 (1994-11-01), Lisle, Jr.

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