High-dynamic Signal Acquisition Technology Based on Multi-high-order-synchrosqueezing
When high dynamic users use LEO satellites for communication,large frequency offset as well as large Doppler rate will be generated due to the high-speed relative movement between the satellite and the terminal.When the frequency change rate within the interception time exceeds the frequency resolution,the conventional acquisition method will fail.In order to realize the acquisition of high dynamic signal,the signal is modeled as a nonlinear FM signal according to the characteristics of Doppler change,and the instantaneous frequency is extracted by time-frequency analysis method.The synchrosqueezing process of high dynamic signal is deduced.In order to improve the aggregation ability and the robustness for dynamic signal of the time-frequency analysis,a multi-high-order-synchrosqueezing method for high dynamic signal is designed.The simulation results show that the frequency estimation error of the method for high dynamic signals with K-level frequency offset and first-order and second-order frequency offset change rate is reduced to about 2.4 Hz at a high signal to noise ratio,and the acquisition probability is increased to about 99.5％,which are both improved as compared with the multi-synchrosqueezing transform methods.
acquisitionnonlinear frequency modulationmulti-high-order-synchrosqueezing
万方数据
维普
