IMPULSE AUTOCORRELATION FUNCTION COMMUNICATIONS SYSTEM

摘要

A pulse code modulation communications system employing orthogonally separated noise code mate pairs having autocorrelation functions which upon detection in a matched filter and addition compress to a lobeless impulse. A mate pair of bi-polar digital noise codes are impressed on respective RF carriers generated by the same frequency source with one code mate being transmitted separately as a vertically polarized wave while the other code mate is transmitted separately as a horizontally polarized wave. The polarized RF carrier signals containing the code mates are respectively received by horizontally and vertically polarized antennas coupled to radio receiver apparatus which provides respective received signals containing the code mates. The code mates are then detected by matched filters which operate to compress the code mates. The compressed code mates are then linearly added to provide an output signal comprising a lobeless impulse signal.