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Width expansion correlator based on GPS L1 signal/L5 signal

A correlator and signal technology, applied in the field of navigation, can solve the problem of difficult balance between tracking accuracy and robustness, and achieve the effects of improving tracking accuracy, reducing tracking error, and strong robustness

Pending Publication Date: 2022-04-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0003] In view of the fact that the existing tracking algorithm fails to effectively utilize the advantages of joint tracking of high and low code rate signals, and there is a background that it is difficult to balance tracking accuracy and robustness in an urban environment, the present invention proposes an extended wide-narrow correlation based on GPS L1 signal / L5 signal Through the natural high and low bit rate characteristics of the two signals, the combination of correlators at different intervals is realized. On the premise of ensuring the robustness of the system, the tracking accuracy is improved and the anti-multipath performance is improved.

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  • Width expansion correlator based on GPS L1 signal/L5 signal
  • Width expansion correlator based on GPS L1 signal/L5 signal
  • Width expansion correlator based on GPS L1 signal/L5 signal

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Embodiment Construction

[0019] Such as figure 1 Shown is an extended wide-narrow correlator based on GPS L1 signal / L5 signal involved in this embodiment, including: three estimation units 100 , 106 and 115 .

[0020] The L1 correlator 102 of the first estimation unit 100 estimates As the center, take one chip as the early and late correlator interval Generate three sets of local signals (early branch instant branch late branch road ),Specifically:

[0021]

[0022]

[0023]

[0024] where C L1 (·) is the L1 pseudo-random code, n represents the nth sampling point, T s is the sampling interval, is the L1 Doppler estimate, is the estimated value of the L1 phase. Combine the three groups of local signals with the L1 baseband signal r L1 Correlation is performed, and T c = 10ms coherent integration, get early, instant, late branch correlation value, specifically:

[0025]

[0026]

[0027]

[0028] Among them, f s is the sampling rate, the L1 signal adopts complex sam...

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Abstract

An expansion width correlator based on a GPS L1 signal / L5 signal comprises a first estimation unit, a second estimation unit and a third estimation unit which are connected in sequence, each estimation unit gives an estimation value, and the correlator outputs an estimation value of a code delay error at the last moment through three times of estimation according to the code delay estimation value. According to the invention, the combination of correlators at different intervals is realized through the natural high and low code rate characteristics of two signals, the tracking precision is improved on the premise of ensuring the robustness of the system, and the improvement of the anti-multipath performance is realized.

Description

technical field [0001] The invention relates to a technology in the field of navigation, in particular to a correlator which uses multi-frequency point signals to improve the tracking accuracy, robustness and anti-multipath performance of navigation signals in an urban environment. Background technique [0002] GNSS is a satellite system that covers the world with independent geographical space positioning. As an important part of signal tracking, the code tracking ring is easily affected by signal occlusion and multipath in urban environments, resulting in decreased accuracy or even loss of lock. The correlator is an integral part of the code tracking loop and is used to estimate the current tracking error. The traditional wide-narrow correlator is a widely used correlator. The combination of a set of wide correlators and a set of narrow correlators achieves the effect of anti-multipath, but the noise level is enlarged. At present, there are abundant navigation signals. Ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/26G01S19/25G01S19/30
Inventor 杨溶徐加玮雷沛璇战兴群
Owner SHANGHAI JIAO TONG UNIV