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Bit synchronization method of satellite navigation signals

A satellite navigation signal, bit synchronization technology, applied in the field of satellite navigation signal bit synchronization, can solve the problems of long bit synchronization time, difficult to find bit edge, carrier-to-noise ratio can not accurately achieve bit synchronization, etc., to improve the capture sensitivity , the effect of shortening the bit synchronization time

Inactive Publication Date: 2014-01-08
BEIJING MXTRONICS CORP +1
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Problems solved by technology

[0004] In the environment of weak navigation satellite signal reception, since the 1ms wide bit value is often not equal to the same 20ms wide data bit time edge, and there are many symbol jumps in the bit, it is difficult to find the bit edge by using the traditional bit synchronization method
Moreover, in the currently existing bit synchronization methods, the changes of strong and weak signals cannot be taken into account at the same time, and the bit synchronization cannot be accurately realized when the carrier-to-noise ratio is low, or the bit synchronization time is too long

Method used

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  • Bit synchronization method of satellite navigation signals
  • Bit synchronization method of satellite navigation signals

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Embodiment Construction

[0026] Further explanation will be given below in conjunction with the accompanying drawings and various specific embodiments as examples, and each embodiment does not constitute a limitation to the embodiments of the present invention.

[0027] Such as figure 1 Shown is the flow chart of the present invention. The signal strength discriminator is used to judge the strength of the satellite navigation signal, and select whether to perform strong signal bit synchronization processing or weak signal bit synchronization processing on the satellite navigation signal according to the result.

[0028] An adaptive threshold determination module, a dot product value calculation module, an accumulator and a discriminator form a weak signal bit synchronization processing branch. The preset symbol string module and the correlation value symbol series module constitute a strong signal bit synchronous processing branch.

[0029] When a satellite navigation signal is received, the signal ...

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Abstract

The invention discloses a bit synchronization method of satellite navigation signals, which comprises judging received satellite navigation signals and choosing a strong signal bit synchronous processing step or a weak signal bit synchronous processing step; in the strong signal bit synchronous processing step, achieving bit synchronization by comparing correlation value symbol strings with preset symbol strings; and in the weak signal bit synchronous processing step, achieving bit synchronization by utilizing related accumulated value of the satellite navigation signals continuous within 2ms. The bit synchronization method can regulate bit synchronization strategies in a self-adaptive mode. Under the condition of strong signals, the bit synchronization method can quickly achieve the bit synchronization to ensure starting time, and under the condition of weak signals, the bit synchronization method ensures reliability of the bit synchronization and shortens the time of the bit synchronization simultaneously.

Description

technical field [0001] The invention relates to a bit synchronization method of satellite navigation signals. Background technique [0002] After the satellite navigation receiver based on the ranging code captures and tracks the satellite signal, it performs bit synchronization processing on the satellite signal, that is, finds the edge of the data bit from the received signal, thereby performing subframe synchronization, data demodulation, and obtaining the signal The navigation message and launch time, and finally realize the navigation positioning. [0003] Bit synchronization is the basis of pseudo-range calculation. The realization of bit synchronization is a random process. The receiver usually has a certain probability of bit synchronization error, and bit synchronization error will introduce an error of integer milliseconds. 1ms error is equivalent to about 300km The pseudo-range measurement error, bit synchronization affects the accuracy of pseudo-range observatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/24
Inventor 吴雨航孙永刚
Owner BEIJING MXTRONICS CORP
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