A Design Method and Anti-jamming Performance Analysis for Vector Tracking Loop

Due to the power of GPS signal is weak at the receiver, it is easy for receiver to be disturbed in lower carrier-to-noise power density ratio (C/N0) environment, a design method of vector tracking loop is proposed, that jamming signals are suppressed in the tracing loop. Actual pseudorange error and pseudorange-rate error are considered as statements, measured pseudorange errors and pseudorange-rate errors are used as measurement information for structure filter. After receiver position is updated, line-of-sight vectors between the receiver and visible satellites can be calculated, then tracking feedback loop is accomplished. The anti-jamming performance of vector tracking loop is analyzed through comparing the predicted pseudorange variance with scalar loop. Actual satellite ephemeris is collected for simulation experiment, the results show that the predicted pseudorange variance of vector tracking loop is lower and the anti-jamming performance is better than the scalar loop.