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GPS weak signal fast capturing realizing method

A technology of GPS signal and implementation method, which is applied in the field of capturing weak GPS signals to achieve the effects of improving sensitivity, shortening time, and improving processing gain

Inactive Publication Date: 2007-11-07
XIAN HUAXUN MICROELECTRONICS
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  • Abstract
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  • Claims
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Problems solved by technology

Although this segmented coherent integration method will not bring integral loss, the required data length will be twice the useful data length

Method used

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  • GPS weak signal fast capturing realizing method
  • GPS weak signal fast capturing realizing method
  • GPS weak signal fast capturing realizing method

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the drawings.

[0036] Figure 1 is a schematic diagram of a commonly used method of increasing gain through piecewise coherent integration. As shown in the figure, the received data is divided into odd array 101 and even array 102. Since the navigation data bits may change every 20 milliseconds, there must be a group of data that is not affected by the navigation data bits. By separately integrating the odd group data 101 and the even group data 102, different gains can be obtained. Through this method, the influence of code phase jumps caused by navigation data changes can be ignored. But this method will discard some useful data that can be used. If there is a phase jump in the odd array 101a, but there is no phase jump in the odd array 101b, then the 10ms data of the odd array 101b can be compared with the even array 102. The data are coherently integrated together, but this method cannot make full...

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Abstract

The invention discloses GPS weak signal fast capture implement method. It includes the following steps: storing the received GPS signal data in the memory; sending to phase detection module to detect data segment position with phase jumping; dividing the data into phase jumping before and after; separately putting on the grouped data G1 and G2; processing coherent integration; sending the result to the compare module; sending the maximum to gain judgment module to judge whether the gain satisfies the capture demand or not; if it is not, sending it to the phase detect module to process the next data. The invention combines the phase jumping detection with the coherent integration to judge code phase jumping position caused by navigation message which can fully utilize received satellite data to realize coherent integration for long time, solve the problem of low capture sensitivity caused by integration loss and low gain.

Description

Technical field [0001] The invention relates to the field of capturing GPS (Global Positioning System) weak signals, in particular to a method for quickly capturing weak GPS signals by estimating phase jumps, increasing the length of coherent integration, and improving the system signal-to-noise ratio (SNR). Background technique [0002] The global satellite positioning system can provide users with accurate position, speed, time and other information, and it has been widely used. However, in complex environments such as indoors, forests, and cities, GPS signals are severely attenuated, and the GPS signal power is far below the working range of general GPS receivers. In these environments, general GPS receivers cannot capture and track. As far as navigation satellite signals are concerned, this greatly limits the application areas of GPS. The FCC (American Communications Commission) issued an administrative order Enhanced 911 (E911), which requires users to be tracked through mob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/02G01S5/14H04L29/02G01S19/30
Inventor 何秋生程亚奇
Owner XIAN HUAXUN MICROELECTRONICS
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