GPS (Global Position System) signal digital correlator

Abstract

The invention discloses a GPS (Global Position System) signal digital correlator, comprising a local C / A code generator, a data input interface, a C / A code receiving register, 16 correlation value computing units, correlation value storage address generator, a clock input interface, a 64 frequency divider and a C / A code receiving counter; each correlation value computing unit comprises a local C / A code storage address generator, a local C / A code storage, a digital adder-subtractor and a correlation value storage connected orderly; the local C / A code generator is connected with each local C / A code storage; the C / A code receiving register is connected with the data input interface and each digital adder-subtractor; and the correlation value storage address generator is respectively connected with the correlation value storage and the local C / A code storage address generator. By using the structure, the effects of less resource consumption, short capture time and accurate capture result in a signal capture process can be achieved.

Description

technical field [0001] The invention relates to GPS satellite positioning and navigation technology, in particular to a digital correlator for signal acquisition. Background technique [0002] GPS (Global Positioning System), the global positioning system, also known as the global satellite positioning system. GPS is a new generation of satellite navigation and positioning system jointly developed by the United States Navy, Land and Air Forces in the 1970s. It is mainly used to provide real-time, all-weather and global navigation services for the three fields of sea, land and air. [0003] At present, we have a set of global satellite positioning and communication system developed by China - "Beidou" satellite navigation system. It consists of three parts: space segment, control segment and user segment. The user end includes military and civilian user equipment, such as receivers. In order to provide users with better navigation services, the development of receivers has ...

AI Technical Summary

Problems solved by technology

Although the search time is relatively reduced compared to the serial search, the complexity of the circuit is increased due to the addition of Fourier transform and inverse Fourier transform to the circuit, and the resource consumption is greatly increased.

[0008] To sum up, the traditional GPS signal acquisition methods have the disadvantages of long time-consuming, complex circuits, large amount of calculation, and high resource consumption, which need to be improved.

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