Wideband FM Anti-jamming Method of FMCW Radar

Triangular wave FMCW radar has been widely used in the field of target detection due to its advantages of large measurement range, simple structure and high degree of automation. However, the inherent non-linearity of the FM signal can easily cause the spectrum aliasing of the difference frequency signal, which not only reduces the effectiveness of the radar's range and speed measurement, but also increases the risk of radar being interfered. Numerous studies have focused on overcoming or compensating the nonlinearity of FM signals, but they can only achieve the narrow bandwidth linearity, and the anti-jamming capability of the radar has not been improved. In this paper, the FM signal is modulated using the frequency hopping technology. In addition, the frequency of FMCW radar hops in an ultra-wide bandwidth, so the influence of the aliasing of the difference frequency signal spectrum on the FMCW radar ranging can be overcome. Furthermore, the anti-jamming capability of FMCW radar has been greatly improved.