Intersymbol difference and code parallel GPS weak signal capturing method and system

Abstract

The invention belongs to the technical field of satellite navigation, and discloses an inter-symbol difference and code parallel GPS weak signal capturing method and system. Comprising a digital down-conversion module, a code merging module, a data storage module, a Doppler stripping module, a data folding module, a step-by-step matching coherence module, an inter-symbol difference module, a Doppler compensation module, a step-by-step coherence module, a step-by-step incoherence module, a peak value judgment module, a Purler search completion judgment module, a Doppler regulation and control module and a result output module. According to the high-orbit GPS signal capturing method based on inter-symbol difference and code parallelism, a rapid and efficient capturing algorithm is provided for a navigation receiver; an inter-symbol difference algorithm is adopted to avoid the influence of navigation data jump on the coherent integration duration, and the capture sensitivity of the GPS signal is improved by improving the coherent integration duration. According to the invention, a step-by-step coherent algorithm and a step-by-step incoherent algorithm are adopted, so that rapid acquisition of signals with different intensities is realized, and the first positioning time of a navigation receiver is shortened.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a GPS weak signal acquisition method and system with inter-code difference and code parallel. Background technique [0002] At present, with the development of satellite navigation systems, satellite navigation has gradually penetrated into all aspects of the civilian field from the initial military field. Tunnels, forests, subways, and indoor places such as large buildings or underground garages have gradually become the application of navigation technology. important place. The rapid growth of demand for satellite navigation services has put more and more pressure on traditional ground measurement and control stations. If satellites or spacecraft have the capability of autonomous positioning and orbit determination, the cost of satellite measurement and control will be greatly reduced. People began to explore the design of high-orbit satellite navigat...

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Problems solved by technology

[0008] Aiming at the problems existing in the prior art, the present invention provides a GPS weak signal acquisition method and system based on inter-code difference and code parallelism, especially relates to a high-orbit GPS weak signal acquisition method and system based on inter-code difference and code parallelism , media, equipment and terminals, aiming to solve the problem of high-sensitivity capture and fast capture of satellite signals by high-orbit GPS navigation receivers

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