An overview of spectrum sensing for harmonic radar

Harmonic radar is an exciting technology for the detection and ranging of nonlinear targets. The advantage of harmonic radar is that it can separate linear clutter from the harmonic target response. Possible disadvantages of harmonic radar include the need for highly sensitive receiver components, which can result in degraded performance in the presence of radio frequency interference (RFI). The authors have previously investigated multiple spectrum sensing techniques for harmonic radar. In this paper, an overview of these techniques are presented. These techniques mitigate the impact of RFI on harmonic radar performance, require a low computational complexity so that an up-to-date measure of the RFI is known, and are applicable to multiple radar types.