Techniques to enhance GNSS signal acquisition and tracking sensitivity

Enhancing GNSS acquisition and tracking sensitivity is critical to improving the GNSS user experience in indoor situations. This paper describes various techniques to enhance GNSS signal acquisition and tracking sensitivity and increasing the robustness and availability of position fixes. Specifically, a technique called Staggered Coherent Integration is proposed which enables up to 1 dB improvement in sensitivity compared to conventional techniques. Also discussed are challenges in tracking the weak signals seen in indoor conditions and techniques to improve sustained tracking under these conditions. Analysis and simulation results are shown to demonstrate the effectiveness of the techniques described.