VORRICHTUNG ZUR ERZEUGUNG EINER ORTHOGONALSEQUENZ

摘要

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, Zo, Zi, . . . Zq-1 in such a manner that when the component is 0, it is substituted with Zo NOTEQUAL 0, and when it is epsilon i (i=1, 2, . . . q-1), it is substituted with zi, where the set of Zo, Zi, . . . Zq-1 are the solution of the following simultaneous algebraic equations: where modq-1(x) 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.