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ANALOG-DIGITAL CORRELATOR
申请号	PCT/US8802159	申请日	1988-06-22	公开(公告)号	WO8900279A3	公开(公告)日	1989-02-09
申请人	HUGHES AIRCRAFT CO;			发明人	BURNS RICHARD J; GRIM KENNETH R; LEVY MIGUEL E;
摘要	An analog-digital correlator (10) utilizes a plurality of sample and hold circuits (16-0 to 16-(M-1)) to directly store samples of a received analog signal. Bits of a correlation pattern are shifted through stages in a correlation pattern shift register (26). The state of the correlation pattern bits causes the value in the associated sample and hold circuit (16) to either be inverted or noninverted when it is summed with other similarly generated signals from the remaining sample and hold circuits to form the correlation output sum by network (30). The output of network (30) will peak when the bits of the digital correlation pattern signal are shifted to stages in register (26) that are aligned with the sample and hold circuits containing the digitally-impressed code of interest. In the preferred embodiment, a mask shift register (28) is used to selectively disable certain of the sample and hold circuits from affecting the correlation output sum. To this end, mask bits corresponding to the length of the digitally-impressed code are shifted through mask register (28) simultaneously with the correlation pattern bits in register (26).
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