The principle of stationary phase states that the major contribution to the energy spectral density comes from when the phase is stationary. In other words, the spectral density energy of frequency is relatively large at a specific time when the rate of change of frequency at that time is relatively small.

Inspec keywords: radar signal processing; Fourier analysis

Other keywords: radar signal processing; generalized Fourier integral; spectral density frequency energy; stationary phase

Subjects: Radar theory; Signal processing and detection; Mathematical analysis