Zero cross-correlation complementary radar waveform signal proce

Details Zero cross-correlation complementary radar waveform signal proce Zero cross-correlation complementary radar waveform signal proce

1991-01-30

1991-09-10

Sotomayor, John B.

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

With particular circuit

For frequency modulation

342204, 342145, 342132, 342134, G01S 1330

Patent

active

050477846

ABSTRACT:
A method and apparatus exploiting the discovery that the crosscorrelation of constantly spaced rows of the matrices representing certain pulse codes sum to zero. In a ranging system, such as a radar, pulses are coded according to the rows of a such a matrix, transmitted sequentially and each return processed sequentially through a filter matched to one of the coded pulses. (A different preselected filter is used for each return.) The sequence of filters is chosen so that for returns for a given range interval, each filter is matched to the returning pulse, resulting in outputs from the filters representing auto-correlations of the returned pulses. These outputs are time delayed added coherently to form the compressed pulse, and annunciated as a target hit. Should the filters and returns be mismatched, as with ambiguous stationary clutter returns, the outputs of the filters are cross-correlations which, according to said discovery, sum to zero. Thus the invention operates to remove ambiguous range clutter from returns in such a ranging system.

REFERENCES:
patent: H767 (1990-04-01), Kretschmer, Jr. et al.
Karl Gerlack and F. F. Kretschmer, Jr., General Forms and Properties of Z Cross-Correlation Radar Waveforms, Naval Research Laboratory, Washington, D.C., NRL Report 9120, Jan. 30, 1990.

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