Parameter estimation of frequency shift keying radar signal intercepted by Nyquist folding receiver using periodic linear frequency modulation local oscillator

Frequency shift keying (FSK) signal has been widely used in modern radar systems. To intercept the FSK with a high interception probability, reconnaissance receiver should have an ultra-wideband receiving ability. The Nyquist folding (NYFR) is novel non-cooperative and it requires small amount of equipment. When intercepted by NYFR, corresponding output hybrid modulation signal. Therefore, necessary to investigate parameter estimation NYFR. Herein, based on NYFR using sinusoidal frequency local oscillator (LO), drawbacks several existing methods are first analysed. overcome these drawbacks, architecture improved changing LO type periodic linear modulation. Then, approach proposed according characteristics template matching rule. method suitable for different kinds common code schemes its computational load low. At last, simulation results show merits method.