This method does not use the time variable as reference but is based on the amplitude of the signal. It can get the multiratesampling for complex signals.
Several stability robustness criteria for this kind of input multiratesampling digital control systems are given in this paper. These criteria are useful and less conservative.
The theoretic of radar digital receiver are sampling, signal orthogonal transform, multirate digital signal processing, DSP algorithm with high efficiency, etc.