Patent ID: 9618626
Date: 2017-04-11
CPC Classifications: G01S

Claim:
1. A method for improving the performance of a navigation receiver operably coupled to an antenna, wherein the navigation receiver and the antenna are subjected to vibration and shock, and wherein the navigation receiver comprises a quartz crystal oscillator generating a quartz crystal oscillator signal having a quartz crystal oscillator frequency, the method comprising the steps of: receiving a plurality of navigation signals, wherein each individual navigation signal in the plurality of navigation signals corresponds to an individual global navigation satellite in a plurality of global navigation satellites, and wherein each individual navigation signal in the plurality of navigation signals has a corresponding radiofrequency; generating a local oscillator signal having a local oscillator frequency, wherein the local oscillator signal is based on the quartz crystal oscillator signal, and wherein the local oscillator frequency is based on the quartz crystal oscillator frequency; generating a plurality of intermediate signals based on the plurality of navigation signals and based on the local oscillator signal, wherein each individual intermediate signal in the plurality of intermediate signals corresponds to an individual navigation signal in the plurality of navigation signals, and wherein each individual intermediate signal in the plurality of intermediate signals has a corresponding intermediate frequency based on a difference between the corresponding radiofrequency and the local oscillator frequency; generating a plurality of sequences of digital signals, wherein each individual sequence of digital signals in the plurality of sequences of digital signals corresponds to a digital representation of an individual intermediate signal in the plurality of intermediate signals; and for each individual sequence of digital signals in the plurality of sequences of digital signals, tracking a phase of the individual sequence of digital signals with an individual channel phase-lock loop, wherein the step of tracking the phase of the individual sequence of digital signals with an individual channel phase-lock loop comprises the steps of: