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Satellite navigation signal tracking system and method suitable for dynamic weak signals

A satellite navigation signal and tracking system technology, applied in satellite radio beacon positioning systems, radio wave measurement systems, measurement devices, etc., can solve the problems of poor tracking loop dynamics, easy lock loss, and low tracking accuracy.

Inactive Publication Date: 2020-04-21
BEIJING MXTRONICS CORP +1
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a system and method suitable for the stable tracking of the carrier and pseudo-code in the navigation receiver in the dynamic weak signal environment, and to overcome the dynamic tracking loop in the prior art. In order to realize the stable tracking of the satellite navigation signal under the dynamic weak signal and improve the dynamic performance and tracking accuracy, the method of the present invention uses the UKF algorithm in the loop tracking to realize high For carrier tracking under dynamic conditions, for code phase tracking, the correlation between code phase offset and Doppler frequency shift is used to adopt carrier-assisted code loop technology, which basically eliminates the dynamic stress on the code loop and realizes high dynamic code tracking.

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  • Satellite navigation signal tracking system and method suitable for dynamic weak signals
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  • Satellite navigation signal tracking system and method suitable for dynamic weak signals

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and method principles. The invention proposes a tracking method for a dynamic weak signal satellite navigation signal.

[0041] Such as Figure 1-Figure 4 As shown, a tracking method of a dynamic weak signal satellite navigation signal, the specific implementation steps are as follows:

[0042] Step 1: The captured maximum energy value, Doppler frequency shift f dacq and code phase offset p acq Save it, and send the satellite navigation signal that has completed the pseudo code and carrier stripping into the tracking channel, and the signal after the mixing result is correlated with the copied pseudo code can be expressed as follows:

[0043] I P (t)=aD(t)cos(ω e t+θ e ) (1)

[0044] Q P (t)=aD(t)sin(ω e t+θ e ) (2)

[0045] Among them, ω e is the carrier angular frequency, θ e is the initial phase.

[0046] Step 2: Determine whether all the messages are rec...

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Abstract

The invention relates to a satellite navigation signal tracking system and method for dynamic weak signals, and belongs to the technical field of satellite navigation signal processing. The method isused for realizing stable tracking of satellite navigation signals under dynamic weak signals. Dynamic performance and tracking precision are improved, a UKF algorithm is applied to loop tracking, carrier tracking under high dynamic is achieved, for tracking of a code phase, the correlation of code phase deviation and Doppler frequency shift is utilized, the carrier-assisted code loop technology is adopted, dynamic stress borne by a code loop is basically eliminated, and high-dynamic code tracking is achieved. Meanwhile, the invention provides a self-adaptive message removing method. Under thecondition that messages are not received completely, influence of the messages is eliminated in a symbol judgment and phase inversion mode, and under the condition that the messages are received completely, known satellite navigation messages are adopted, influence of the messages is eliminated, long-time coherent integration is achieved, and then carrier tracking and code tracking under the weaksignal environment are achieved.

Description

technical field [0001] The invention relates to a satellite navigation signal tracking system and method for dynamic weak signals, belonging to the technical field of satellite navigation signal processing. Background technique [0002] At present, with the expansion of satellite navigation application fields, traditional receivers can no longer meet the navigation and positioning requirements in harsh environments such as dynamics and occlusions. For this reason, China has begun to develop receivers under high dynamics, and develop receivers suitable for occluded environments. Due to the high dynamic harsh environment, the receiver has a certain speed, acceleration, and jerk, which increases the Doppler change of the signal, making it difficult for the receiver to track the satellite navigation signal. In the case of occlusion, the satellite signal is weak, the tracking accuracy of the traditional tracking loop is very low, and it is easy to lose the lock. Contents of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 吴雨航毕波
Owner BEIJING MXTRONICS CORP
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