Rapid joint capture method for satellite navigation compatible interoperation signals

Abstract

The invention discloses a rapid joint capture method for satellite navigation compatible interoperation signals. The method comprises the following steps of: giving the generalized likelihood ratio detection quantity of joint capture and the analytic expression of false alarm probability and detection probability of the generalized likelihood ratio detection quantity, and establishing a vector linear observation model of multi-satellite signals; and establishing a multi-satellite joint capture detector. The generalized likelihood ratio detection quantity of joint capture is given; coherent integration results of satellite signals of all channels are combined in an incoherent mode; local signals corresponding to different satellites are respectively subjected to correlation and coherent integration with received signals; detection is carried out by utilizing the sum of the signals of all the channels so as to further improve a capture rate; and finally, a joint capture implementation structure based on PVT domain search is completely provided. The invention provides an effective method for the multi-satellite joint capture of satellite navigation receivers.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and relates to a satellite navigation signal receiving system, in particular to a fast joint acquisition method for satellite navigation compatible and interoperable signals. Background technique [0002] The global satellite navigation pattern is undergoing changes. With the emergence of new navigation constellations such as my country's Beidou system and the European Galileo system, satellite navigation has developed from a single GPS system to multiple GNSS coexistence, and the reception and processing of navigation signals are facing more opportunities and challenges. , in the first 20 years of this century, multiple satellite navigation systems will be built, and there will be more than 120 satellites in the sky. Satellite navigation receivers can be combined with multiple GNSS systems to provide seamless For global navigation and positioning services, the existence and combination of multi...

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Problems solved by technology

[0003] Since the traditional capture performs time and frequency two-dimensional search and capture on a single satellite signal, the capture efficiency is low, but the joint capture of the present invention can make full use of auxiliary information and multi-satellite signals to improve the signal detection method of the capture rate, which can significantly improve Acquisition efficiency is an effective way to solve the above needs. At present, the joint acquisition technology using multi-satellite signals is still blank. This paper proposes a fast joint acquisition method for satellite navigation compatible and interoperable signals.

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