Waveform construction for distributed radar with high Doppler tolerance

Distributed radar sites needs a group of nearly-orthogonal waveforms and polyphase coded waveforms (PCWs) can approach the orthogonality in the code dimension. However, PCWs are sensitive to Doppler mismatch in range compression, which can induce signal-to-noise ratio (SNR) loss and sidelobe level increase. In this paper, we first study how to design a seed PCW with a high Doppler tolerance and then propose a waveform construction method that can simultaneously construct a group of nearly-orthogonal PCWs based only on the seed PCW. It is also proved that all the constructed PCWs share the same high Doppler tolerance with the seed PCW. The effectiveness of this method is verified by numerical results.