Compatibility capturing method of multi-mode GNSS (Global Navigation Satellite System) combination receiver

Abstract

The invention discloses a compatibility capturing method of a multi-mode GNSS (Global Navigation Satellite System) combination receiver. The capturing method comprises the following steps of: carrying out corresponding capture process on a satellite signal within coherent integration accumulation time and non-coherent integration accumulation time; adopting a fuzzy logic algorithm in the capture process, dynamically adjusting the coherent integration accumulation time and the non-coherent integration accumulation times according to a carrier-to-noise ratio and a carrier speed; and within the coherent integration accumulation time, carrying out the secondary sampling on a middle frequency signal of the acquired satellite signal, i.e. all data are decomposed into a plurality of groups, and the data points in each group are at one pseudo-random code element, and subsequently the Fourier transform, the Fourier inversion, the DCT (Discrete Cosine Transformation), the IDCT (Inverse Discrete Cosine Transform), the mode value square and threshold judgment process are carried out. With the adoption of the capturing method, the defects that signals cannot be captured as an existing capturing method is low in sensitivity and likely to be interfered are overcome, and satellite signals can be captured normally when a GNSS signal is shielded and strong environment noise exists.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a multi-mode GNSS combined receiver compatible acquisition method. Background technique [0002] The Global Navigation Satellite System (GNSS) is a satellite-based radio navigation system, which includes satellite constellations, ground monitoring systems and user terminal equipment, and can provide all-weather, uninterrupted, high-speed Accurate, real-time navigation and positioning services. At present, the most widely used global navigation satellite system is the GPS (Global Positioning System) of the United States, which has penetrated into various fields of national economy and daily life, such as maritime navigation, urban traffic management, commercial logistics management, ship ocean navigation, precision receiving time, geodesy, precision agriculture, etc. At present, my country has also participated in the construction of the Galileo system, which will b...

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Problems solved by technology

[0006] The invention provides a multi-mode GNSS combined receiver compatible acquisition method, which overcomes the drawbacks of the existing GNSS receivers, which are low in sensitivity and easily interfered with, resulting in satellite signal loss of lock, and thus cannot provide positioning results. By designing a multi-mode GNSS The system is compatible with the acquisition scheme, improves the acquisition algorithm, takes measures to improve the acquisition sensitivity and acquisition speed of the GNSS combined receiver, and improves the performance of GNSS positioning reliability and positioning accuracy

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