Navigation method based on INS-assisted (Inertial Navigation System) GNSS (Global Navigation Satellite System) vector tracking loop

Abstract

The invention discloses a navigation method based on an INS-assisted (Inertial Navigation System) GNSS (Global Navigation Satellite System) vector tracking loop. The navigation method comprises the following steps: S1: converting a received satellite signal into an intermediate frequency digital signal, and carrying out carrier wave removal and integral clearing on the intermediate frequency digital signal to obtain an I/Q signal; S2: utilizing the I/Q signal to obtain a carrier-to-noise ratio C/N0 of the satellite signal; S3: determining a signal tracking loop order and an optimal bandwidth according to the carrier to noise ratio C/N0; and S4: if the dynamic stress of the carrier is greater than a set threshold value, adopting the INS-assisted vector tracking loop to track the I/Q signal,and otherwise, adopting an INS-assisted scalar tracking loop to track the I/Q signal. By use of the method, the navigation ability of a highly dynamic receiver under a high-adverse electromagnetic environment can be improved, and the method is especially suitable for navigation requirements of missile-borne high-dynamic satellite navigation under a complex electromagnetic environment.

Description

technical field [0001] The invention belongs to the technical field of satellite positioning and navigation, and in particular relates to a navigation method based on an INS-aided GNSS vector tracking loop. Background technique [0002] The global satellite navigation system can provide position, speed and time information in real time around the clock, and has become an indispensable source of navigation information for low-cost guided weapons. High dynamic positioning and navigation systems are widely used in guided weapons. However, due to the low power of satellite signals, the satellite navigation system faces a harsh electromagnetic environment with weak signals and strong interference, and is vulnerable to unintentional and intentional interference. Low-cost guided rockets, guided artillery shells and other guided munitions are limited by cost and volume, and it is difficult to use high-performance and high-cost antenna arrays combined with space-time adaptive filteri...

AI Technical Summary

Problems solved by technology

However, due to the low power of satellite signals, the satellite navigation system faces a harsh electromagnetic environment with weak signals and strong interference, and is vulnerable to unintentional and intentional interference.

Low-cost guided rockets, guided artillery shells and other guided munitions are limited by cost and volume, and it is difficult to use high-performance and high-cost antenna arrays combined with space-time adaptive filtering and other anti-jamming technologies

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