Communications: directive radio wave systems and devices (e.g. – Determining distance – With correlation
Patent
1989-06-29
1990-04-03
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With correlation
342134, 342201, G01S 1364, G01S 1310
Patent
active
H00007676
ABSTRACT:
A method and apparatus exploiting the discovery that the cross-correlation of rows of Frank or P4 matrices of a given spacing sum to zero. In a ranging system, such as a radar, pulses are coded according to the rows of a Frank or P4 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.
Gerlach Karl R.
Kretschmer, Jr. Frank F.
McDonnell Thomas E.
Miles Edward F.
Tarcza Thomas H.
United States of America
Wallace Linda J.
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