The instantaneous frequency measurement receiver in the complex electromagnetic environment

Real-time measurement of the carrier frequency of radar signals is an essential part of electronic-reconnaissance systems. The wideband instantaneous frequency measurement (IFM) receiver offers a high intercept probability over wide instantaneous RF bandwidths, high dynamic ranges, good sensitivity and high frequency measurement accuracy. The ability to process economically wide instantaneous RF bandwidths, while making this type of receiver attractive to the system designer, intensifies the problem of measurement correctness in the complex electromagnetic environment. The problem of linear detection in instantaneous frequency measurement systems is presented. Measurement data are shown and compared to theoretical analysis. Methods of minimizing the linear detection error are proposed.