A B1I Signal Capture Algorithm Based on Multi-Multiplier PMF and Tong Detection

Aiming at the characteristics of BeiDou satellite navigation B1I signal with large Doppler shift and fast change in high dynamic environment, a capture algorithm based on multi-multiplicity PMF and Tong detection is proposed. The preprocessing link carries out automatic gain control on the input signal in order to quantize the result after speed reduction in multiple bits, and the PMF link adopts the multi-multiplicity method to carry out the relevant operation, and the relevant result is handed over to the Tong detector for judgment. After the derivation of the formula and software simulation to determine the optimal parameters, the capture probability of this algorithm is greater than 90% when the carrier-to-noise ratio is greater than 36 dB-Hz, which indicates that this algorithm meets the demand for capturing navigation signals in high dynamic environments and has a certain application value.