Concatenating codes for improved ambiguity behavior

We produce new phase coded waveforms, by concatenating two sequences from two different families of CAZAC codes. In particular, we consider two pairs of families: Wiener and Bjorck codes, and Chu-Zadoff and P4 codes. For both pairs, equally proportioned systems generate signals with reduced sidelobes, at nonzero low Doppler shifts. The 50%-50% concatenated Wiener and Bjorck systems lead to signals with improved autocorrelation and detection-tracking performance.