Design and analysis of high dynamic GPS/SINS integrated navigation schemes

When designing the GPS/SINS integration under high dynamic environment, the performance of GPS is the key to its successful performance; the crux of GPS performance is the architecture of GPS tracking loop. Once the dynamics of environment exceed a threshold and the tracking loops lose track of just one satellite, the integrated system will lose the assistance of GPS. Usually, GPS receivers employ the Phase-locked loop (PLL) to track an incoming IF signal and to provide accurate carrier phase measurements. However, under high dynamic environments, the conflict between the ability to track the signal and improving PLL tracking performance must be compromised in PLL design. Aiming at this issue, this paper provides two schemes: high dynamic receivers, ultra-tight integration. Simulations show that high dynamic receiver can track 10g of acceleration and ultra-tight coupled navigation system can track 50g of acceleration. Theorization and simulations give the advantages and disadvantages of both schemes. This paper also provides conditions that each scheme fits.