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Method for detecting and repairing satellite navigation signal carrier cycle clips assisted by doppler frequency offset

A technology of satellite navigation signal and Doppler frequency offset, which is applied in the field of satellite navigation and positioning, and can solve the problems of large amount of calculation and insufficient real-time performance.

Active Publication Date: 2013-09-04
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to overcome the disadvantages of large amount of calculation and insufficient real-time performance in the prior art, and provide a fast and real-time method for the real-time detection and repair of satellite navigation signal carrier cycle slip assisted by Doppler frequency offset

Method used

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  • Method for detecting and repairing satellite navigation signal carrier cycle clips assisted by doppler frequency offset
  • Method for detecting and repairing satellite navigation signal carrier cycle clips assisted by doppler frequency offset
  • Method for detecting and repairing satellite navigation signal carrier cycle clips assisted by doppler frequency offset

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Embodiment

[0108] Data source: a set of 2000-point cycle-slip-free data with a nominal sampling interval of 0.1 second, artificially adding 1, -3, and 7 cycle slips at epochs 200, 400, and 800, respectively. image 3 Shown is the remnant of the inter-epoch phase difference after artificially added cycle slips.

[0109] Method implementation: press figure 1 The implementation process shown is carried out step by step, first according to figure 2 The navigation receiver structure sets the nominal sampling interval T sn 0.1 second; navigation receiver local intermediate frequency deviation δf i0 2.3KHz. Take the navigation receiver measurement data of the previous Q (Q takes 5) epochs to calculate the mean value of the residual phase difference between epochs 0 is 0.048 weeks, the variance σ 0 is 0.016 weeks, set the cumulative cycle slip value dN 0 is 0.

[0110] According to step 2)-step 5), detection and repair of cycle slips are carried out on the data. Table 1 shows the resid...

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Abstract

The invention discloses a method for detecting and repairing satellite navigation signal carrier cycle clips assisted by doppler frequency offset. A doppler frequency offset measurement value reproduced by a navigation receiver is utilized to detect and repair the cycle clips on carrier phase measurement in an assistant mode. A feasible scheme is provided for position calculation by utilizing a cycle-clip-free carrier phase measurement value in real-time positioning. In the k+1 epoch, the phase difference residual between epochs is calculated out by means of satellite carrier phase measurement values, doppler frequency offset measurement values and nominal sampling interval and accumulation cycle clips provided by a current-epoch navigation receiver and a k-epoch navigation receiver. The phase difference residual between the epochs is compared with a mean value of the phase difference residual between the epochs. When an absolute value of the difference between the phase difference residual between the epochs and the mean value of the phase difference residual between the epochs is larger than a detection threshold of the cycle clips, the cycle clips exist in a carrier phase, and an integer closest to the difference is taken to serve as a cycle clip value to repair the cycle clips of the carrier phase. By means of the method, the detection and the reparation of the satellite navigation signal carrier cycle clips can be quickly achieved in real time.

Description

technical field [0001] The invention belongs to the field of satellite navigation and positioning, and in particular relates to a method for real-time detection and repair of satellite navigation signal carrier cycle slip assisted by Doppler frequency offset. Background technique [0002] The Beidou satellite navigation system is a global satellite navigation system independently developed and operated independently by China. Together with the US GPS, Russia's GLONASS, and the EU's Galileo system, it is known as the world's four major satellite navigation systems. The Beidou satellite navigation system provides positioning, navigation, timing and short message communication services. As of December 2, 2011, China has sent 10 second-generation Beidou satellites, and plans to cover the Asia-Pacific region around 2012 and the whole world around 2020. The construction of the Beidou satellite navigation system promotes the formation of the satellite navigation industry chain, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/29
Inventor 任周丰钟杰赵民建李立言
Owner ZHEJIANG UNIV
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