The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 04, 1992
Filed:
Jan. 16, 1991
Tetsuo Kirimoto, Kanagawa, JP;
Yoshimasa Ohhashi, Kanagawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
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.