MTI using a polyphase code

Details MTI using a polyphase code MTI using a polyphase code

1983-01-28

1995-10-31

Barron, Jr., Gilberto

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

Determining distance

With frequency modulation

342160, G01S 1328, G01S 13524

Patent

active

054633990

ABSTRACT:
An improved MTI radar system including a signal expander/compressor for providing palindromic P2 phase-coded upswept and downswept expanded signals that are alternately transmitted by a radar transmitter. The echos from the upswept and downswept signals are received by a receiver, compressed in the signal expander/compressor and inputted to an MTI subtractor. Since the autocorrelation sidelobes of the palindromic phase coded echos are real, the echos from stationary clutter are completely cancelled so that the system is capable of detecting weak echos from moving targets.

REFERENCES:
patent: 3225349 (1965-12-01), Thor
patent: 3808594 (1974-04-01), Cook et al.
patent: 3905033 (1975-09-01), Moore et al.
patent: 4096478 (1978-06-01), Chavez
patent: 4241347 (1980-12-01), Albanese et al.
Lewis et al, A New Class of Polyphase Pulse Compression Codes and Techniq, IEEE Trans, on Aerospace and Electronic Systems, vol. AES-17 No. 3, May 1981, pp. 364-371.
Kretschmer et al, Polyphase Pulse Compression Waveforms, NRL Report 8540 Jan./1982, pp. 1-21.

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