Concurrent operation and cross-radar interference cancellation of two over-the-horizon radars

It is known that improved target characterizations can be achieved by concurrently using multiple over-the-horizon radars (OTHRs) as compared to a single OTHR operating alone. However, a key limitation with OTHR radar is the selection of an appropriate operating frequency, given the rising demand on radar waveform bandwidth commensurate with the range resolution requirements. The authors have considered concurrent operations of two OTHR systems that use the same frequency band with different chirp waveforms, and a cross-radar interference cancellation technique has been developed. The purpose of this paper is to examine the performance of cross-radar interference cancellation in the presence of multiple target returns from both auto-and cross-radar reception modes. It is shown that, the interference between target returns corresponding to the same radar is negligible, whereas the residual error of cross-radar interference cancellation in the presence of signal returns corresponding to different radars takes a low value in a typical application scenario.