Study on the Influence of Antenna Arrays Anti-Jamming Algorithms on GNSS Receiver Single Point Position

GNSS has been widely used in military, aviation and other fields due to its high precision and wide coverage. However, GNSS signal is so weak that it is susceptible to interference. The antenna arrays anti-jamming algorithms are effective methods to enhance the robustness of the GNSS receiver single point position. According to whether the steering vector of the GNSS signal is needed, the algorithms are generally divided into two categories, i.e. minimum variance distortion less response (MVDR) algorithm and power inversion (PI) algorithm. Both of those two algorithms can implement null steering in the interference direction to suppress interference. The former needs the steering vector of the GNSS signal and can implement beamforming steering in the GNSS signal direction while the latter does not. The cost of those two anti-jamming algorithms is the introduction of pseudo-code measurement error. In this study, the principle of pseudo-code measurement error introduced by those two algorithms is analyzed. Several experiments are implemented to evaluate the pseudo-code measurement errors introduced by those two algorithms when the GNSS signal parameters and the inference signal parameters vary. Results show that –5 to 5 m errors are introduced into the pseudo-code measurement for the PI algorithm when the GNSS and the interference signal parameters vary. For the MVDR algorithm, the pseudo-code measurement errors are smaller than those of PI algorithm. Receiver single point position (SPP) is tested using real BDS observations and simulated pseudo-code measurement errors introduced by those two algorithms. Results show that several meters level position errors are introduced into the receiver SPP.