SATELLITE NAVIGATION RECEIVER WITH FIXED POINT SIGMA RHO FILTER

摘要

A multi-band satellite navigation receiver for carrier and code tracking using a fixed point sigma rho filter with improved stability is described. The receiver simplifies and speeds up the data processing in the filter to adaptively accommodate common information from aggregate bands and obtain the accurate position of the receiver in real time. The filter may utilize a standard deviation function and a cross correlation function while determining adaptive scale factors to ensure that the filter is stable and reliable.

主权项

1. A satellite navigation receiver comprising:
a receiver front end for down-converting a composite received signal comprising a plurality of carrier signals; an analog-to-digital converter for converting the down-converted composite received signal to a digital composite received signal; a plurality of signal generators each for generating a local reference carrier signal and a local reference ranging code based on carrier corrective control data and code corrective control data, wherein the local reference carrier signal and the local reference ranging code are associated with one of the plurality of carrier signals; a plurality of receiver modules each comprising a correlator for determining one of a plurality of correlations of the digital composite received signal to the local reference carrier signal and the local reference ranging code, wherein each of the plurality of correlations comprises an in-phase correlation and a quadrature correlation and is associated with one of the plurality of carrier signals; and an aggregate predictive filter in communication with the plurality of signal generators, the aggregate predictive filter for estimating the carrier corrective control data and the code corrective control data based on the plurality of correlations.