Interference mitigation based on miniature switch GNSS array

Signals of global navigation satellite system (GNSS) are susceptible to radio frequency interference (RFI). The inherent channel bias and mutual coupling in conventional array can worsen the performance of interference mitigation. To mitigate interference, a miniature switch array with all elements sharing one RF channel is proposed. With the synchronization between switching time and integral time of the tracking loop, switching vector is compensated when calculating the weights. And then adaptive beam forming is achieved based on correlator-based beam forming (CBF) when the unworking elements are connected to open-circuit. Minimum variance distortionless response algorithm (MVDR) is used to make sure the phase center is fixed in the synthetic array. Simulation shows that when the inter-element spacing was 0.35 lambda, switch array is more effective on interference mitigation than conventional array due to less channel bias.