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Method and system for synchronizing data bit of global satellite positioning system

A global satellite positioning and data bit technology, applied in satellite radio beacon positioning systems, positioning, radio wave measurement systems, etc. technical effect

Inactive Publication Date: 2010-04-21
SUNPLUS TECH CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and system for synchronizing data bits of a global satellite positioning system, thereby solving the problem that the known histogram statistical method cannot effectively perform synchronization in an environment with a low signal-to-noise ratio, and at the same time solving the known Problems that technology cannot quickly locate

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  • Method and system for synchronizing data bit of global satellite positioning system
  • Method and system for synchronizing data bit of global satellite positioning system
  • Method and system for synchronizing data bit of global satellite positioning system

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Embodiment Construction

[0016] Please refer to Figure 4 The block diagram of the system is shown. It receives a satellite signal transmitted by the satellite and generates a synchronization signal. Each data bit of the satellite signal is composed of N coarse codes (Coarse / Acquisition Code), where N is a positive integer. The system includes a data buffer 410 , a matched filter 420 , a correlation combination device 430 and a selection device 440 .

[0017] The data buffer 410 is used to receive and store the data bits of the satellite signal. In this embodiment, the operation is performed on three data bits. Since each data bit has 20 CA codes, the data buffer 410 has a total of 3×20 bits. Since a coarse code can be stored in one or more bits, the data buffer 410 can use a word as a unit.

[0018] The matched filter 420 is coupled to the data buffer 410, and filters the 20 coarse codes of each data bit to calculate the correlation (correlation) of the 20 coarse codes in each data bit, and output...

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Abstract

A data bits synchronous device of global satellite positioning system consists of a data buffer for receiving and storing data bits of satellite signal, a matching filter for filtering N numbers of crude codes at each data bit to calculate out relativity of these crude codes and for outputting a relativity set corresponding to said data bit, a selection unit for selecting out relativity with maximum value from N numbers of relativities in relativity set and for applying crude code corresponding to relativity with maximum value as synchronous signal.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and system for synchronizing data bits of a global satellite positioning system. Background technique [0002] In the Global Positioning System (Global Position System, GPS), the transmitted data bits are composed of 20 Coarse / Acquisition Codes (CAcodes) processed by Spread Spectrum. The receiving device receives the satellite signal, converts it to an intermediate frequency signal through radio frequency down-conversion, and uses an analog-to-digital converter (ADC) to sample the intermediate frequency signal, and then uses signal processing technology to extract the original satellite signal bits for positioning. Even in a low signal-to-noise ratio (SNR) environment, signal synchronization such as CA synchronization (CA Synchronization) and data bit synchronization (Bit Synchronization) must be completed in order to successfully complete the purpose of data de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/02G01S1/04G01S5/02G01S5/14G01S19/24G01S19/30
Inventor 陈家溢洪清标
Owner SUNPLUS TECH CO LTD
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