Group orthogonal arrays for elimination of multiple-time-around

Details Group orthogonal arrays for elimination of multiple-time-around Group orthogonal arrays for elimination of multiple-time-around

1987-12-07

1988-11-01

Buczinski, Stephen C.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

For pulse modulation

342145, G01S 744

Patent

active

H00005487

ABSTRACT:
Sets of group-complementary code arrays which have the property of being ually orthogonal over a subinterval of their total cross-correlation function have been identified. These group-orthogonal arrays are generated by a multiplication operation upon a given group-complementary array using a matrix which has diagonal elements from vectors which are orthogonal. Composite code arrays are synthesized by interleaving rows from the group-orthogonal set of arrays, and applying the resulting rows of codes to bi-phase modulate pulses in bursts. The resulting composite waveform has the desirable property of temporal (zero-Doppler) sidelobe cancellation in the maximum unambiguous range interval and response cancellation over one or more multiple-time-around range intervals of an equivalent uncoded pulse sequence. The waveforms also have the property of maximizing the receiver response in one of the multiple-time-around range intervals, while achieving response cancellation in the maximum unambiguous range interval of an equivalent uncoded pulse sequence.

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