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Satellite navigation signal fast capturing method and device

A technology of satellite navigation signals and satellite signals, which is applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of prolonged satellite signal capture time and long-time satellite long-code signal, so as to improve the capture speed and improve The effect of computing efficiency

Active Publication Date: 2015-02-11
成都海亨利科技有限公司
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Problems solved by technology

In modern GNSS, some systems use long codes, such as: P code of GPS, P code of Beidou system, 4ms long code of Galileo system, etc., and the acquisition of such satellite long code signals generally takes a long time
In addition, in order to improve the receiving sensitivity of modern satellite navigation receivers, the calculation method of increasing the integration time is generally used, which will also lead to a significant increase in the acquisition time of satellite signals

Method used

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  • Satellite navigation signal fast capturing method and device

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Embodiment 1

[0012] Further describe the technical scheme of the present invention below in conjunction with accompanying drawing, as figure 1 Shown, the purpose of the present invention is achieved through the following technical solutions:

[0013] First, the RF / down-conversion module receives all visible satellite signals through the antenna. After the RF / down-conversion is filtered, amplified and mixed, it is converted into an analog I / Q intermediate frequency signal, and then passed through an analog-to-digital converter (ADC). The analog signal is converted to a discrete digital IF signal. Finally, the output end of the ADC is connected with the digital circuit for fast capture of the satellite navigation signal of the present invention.

[0014] The fast capture device includes the following parts: intermediate frequency processing module, storage control module, code generator, carrier NCO, code NCO, correlation operation module (including coherent operation and non-cohere...

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Abstract

The invention provides a satellite navigation signal fast capturing method and device, wherein the satellite navigation signal fast capturing method comprises the following steps that a crystal oscillator clock of a receiving machine is corrected for reducing the frequency searching range; through auxiliary information such as the position and the time, the code phase and the Doppler error value are estimated, and the searching range is reduced to the maximum degree; according to the estimation result, the two-dimension estimation value is set to be a searching center, in addition, a spiral searching sequence is adopted for signal catching, and the searching is gradually carried out from points with high probability to the points with low probability; the intensity of satellite signals is detected, in addition, different integral time and catching steps are used according to the signal intensity self adaptation; a flexible judging mode is adopted, the use of the threshold judgment or the maximum value judgment is determined according to the intensity of the satellite signals; the threshold dimension is regulated according to the capturing success rate. The satellite navigation signal fast capturing method and device have the advantages that the capturing operation efficiency can be improved to the maximum degree, and in addition, the capturing speed of the satellite signals can be accelerated.

Description

technical field [0001] The invention relates to a method and device for quickly acquiring satellite navigation signals. Background technique [0002] The current global satellite systems include: the GPS system of the United States, the GLONASS system of Russia, the Beidou system of China and the Galileo system of Europe. Japan and India have also proposed their own navigation satellite system plans. [0003] For the above various satellite navigation systems, the principles of satellite navigation and positioning are similar, and satellite signals need to be captured before positioning. In modern GNSS, some systems use long codes, such as: P code of GPS, P code of Beidou system, 4ms long code of Galileo system, etc., and the acquisition of such satellite long code signals generally takes a long time. In addition, in order to improve the receiving sensitivity, the modern satellite navigation receiver generally adopts the calculation method of increasing the integration time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/30
CPCG01S19/23G01S19/24G01S19/30
Inventor 不公告发明人
Owner 成都海亨利科技有限公司
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