Subspace cross-correlation interference eliminating method based on Doppler frequency difference attenuation factor

Abstract

The invention provides a subspace cross-correlation interference eliminating method based on a Doppler frequency difference attenuation factor. The method comprises the steps that firstly, intermediate-frequency signals corresponding to received satellite navigation signals are determined, and Doppler frequency and the signal to noise ratio corresponding to the satellite navigation signals are determined according to the intermediate-frequency signals; then, a strong signal in the satellite navigation signals is determined according to the signal to noise ratio; the satellite navigation signals are grouped according to the Doppler frequency corresponding to the strong signal in the satellite navigation signals; finally, weak signals without strong signal interference in each satellite navigation signal group are determined according to a subspace projection method and are captured, the satellite navigation signals need to be captured, and the strong signal is obtained. The strong signal in the satellite navigation signals is determined, the satellite navigation signals are grouped according to the Doppler frequency corresponding to the strong signal, and finally cross-correlation interference of each group is eliminated according to the subspace projection method. Therefore, the operation amount is reduced effectively, and the requirement for real-time performance can be met better.

Description

technical field [0001] The invention relates to satellite navigation technology, in particular to a subspace mutual correlation interference elimination method based on Doppler frequency difference attenuation factor. Background technique [0002] With the development of satellite navigation technology, the application of satellite navigation is becoming more and more extensive. The cross-correlation interference between strong signals and weak signals between satellites in the Global Navigation Satellite System (GNSS) will cause weak signals The distorted signal needs to be filtered for a long time to eliminate it, and this distorted signal will cause positioning errors. In some fields that require high positioning accuracy and high real-time requirements, such as civil aviation In the field, it is impossible to eliminate the distorted signal through long-term filtering, so the positioning error caused by the distorted signal will endanger the safety of life. [0003] In t...

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Problems solved by technology

[0005] The embodiment of the present invention provides a subspace cross-correlation interference elimination method based on the Doppler frequency difference attenuation factor, so as to overcome the problem in the prior art that the calculation amount is large and the real-time requirements cannot be met

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