Analysis of an improved fixed-point loop for satellite navigation receiver

Aim to avoid the deficiency of huge computation load and resource use in conventional fixed-point loop control method, base on the study of signal tracking method and accuracy of navigation receiver, an improved one is proposed, along with theoretical analysis and actual verification of the accuracy loss of signal tracking compared to the floating-point loop control method from the following two aspects respectively: quantization error of phase discriminator, approximation of filter coefficients, as well as the discipline when choosing appropriate filter coefficients. The results demonstrate that the accuracy loss of signal tracking in the improved method is very small with appropriate filter coefficients, which can be accepted.