Orthogonal sequence generator and radar system incorporating the

Details Orthogonal sequence generator and radar system incorporating the Orthogonal sequence generator and radar system incorporating the

1991-01-16

1992-08-04

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 370 21, 342195, H04L 2730, G01S 1302

Patent

active

051366118

ABSTRACT:
An apparatus, usable in a radar system, for generating a multi-value orthogonal sequence includes a multi-element M-sequence generator and a component substituting device. The M-sequence generator comprises a shift register including delay elements, multipliers for multiplying signals output from the respective delay elements by feedback factors, and adders for adding the multiplied signals from the multipliers to provide the result to the delay element initially arranged in the shift register whereby a multi-element M-sequence is generated from the delay element finally arranged therein. The substituting device comprises a microcomputer and substitutes each component of the M-sequence with one of complex-numbers, Z.sub.o, Z.sub.i, . . . Z.sub.q-1 in such a manner that when the component is 0, it is substituted with Z.sub.o .noteq.0, and when it is .epsilon..sup.i (i=1, 2, . . . q-1), it is substituted with z.sub.i, where the set of Z.sub.o, Z.sub.i, . . . Z.sub.q-1 are the solution of the following simultaneous algebraic equations: ##EQU1## where mod.sub.q-1 (.multidot.) represents a calculation of modulo (q-1) and is expressed as q-1 when the result is 0, * represents a complex conjugate, and r=1, 2, . . ., q-2.

REFERENCES:
patent: H484 (1988-06-01), Holliday
patent: 3890618 (1975-06-01), Speiser
patent: 4513288 (1985-04-01), Weathers et al.
patent: 4939745 (1990-07-01), Kirimoto et al.
R. L. Frank, "Phase Shift Pulse Codes With Good Periodic Correlation Properties".
"IRE Trans. on Info. Theory"; (IT-8, Oct. 1962; pp. 381-382).
Suehiro et al., "Modulatable Orthogonal Sequences and Their Application to SSMA Systems"; IEEE Trans. on Info. Theory; (IT-34, No. 1; Jan. 1988; pp. 93-100).

Affiliated with

Also associated with

Rating

Orthogonal sequence generator and radar system incorporating the does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Orthogonal sequence generator and radar system incorporating the, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orthogonal sequence generator and radar system incorporating the will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-785295