adaptive frequency shift的用法和样例：
- The earth's rotation and its motion around the sun add an appreciable frequency shift.
- The APV(Adaptive Phase/Doppler Velocimetry)system can b e used to measure the particle size and velocity adaptively according to the Dop pler frequency shift and the Doppler phase shift theory.
- According to the laser gain change is linear related to the frequency shift, the Doppler frequency is extracted by the signal processing.
- The generator of adaptive FH pattern is designed.By using it and the result of the LQA, adaptive frequency selection is accomplished.