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Implementation method for self-adaptive GPS software receiver

A software receiver and self-adaptive technology, used in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of weak satellite signals, no satellite signals, and inability to meet high dynamic and high sensitivity application requirements at the same time. , to achieve the effect of improving dynamic performance and improving tracking stability

Inactive Publication Date: 2012-07-04
GUANGZHOU HESHENG TEACHING EQUIP CO LTD
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Problems solved by technology

[0023] (6) If no modulus value exceeding the threshold is found in step (5), it means that the satellite signal does not exist or the satellite signal is too weak to be captured by the 1 millisecond relative time
Regardless of the high dynamic or high sensitivity receiver, its design method is not flexible enough to meet the requirements of high dynamic and high sensitivity applications at the same time

Method used

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  • Implementation method for self-adaptive GPS software receiver
  • Implementation method for self-adaptive GPS software receiver
  • Implementation method for self-adaptive GPS software receiver

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Embodiment Construction

[0072] Each channel of the GPS software receiver has four possible states, namely the unlocked state, the refined state, the ready state, and the tracking state. The processing of the input IF signal by the channel depends on the state of the channel, and the state may change after the processing is completed , The state transition such as Picture 11 Shown. The processing methods in each state are introduced below. Among them, the locked state and refined state correspond to the capture process, and the ready state and tracking state correspond to the tracking process.

[0073] 1. Capture

[0074] The capture method of the intermediate frequency signal is based on the non-correlated integration capture method, because in this way, the integration length can be adjusted as needed. As we all know, the amount of calculation in the capture process is too large. This section uses auxiliary information and some strategies to reduce the amount of calculation.

[0075] 1.1 Acceleration a...

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Abstract

The invention designs a GPS software receiver, which is suitable for various working environments with low signal to noise ratio, high dynamic, assistance of an inertial navigation system (INS) or independent working and the like, automatically regulates performance as required to adapt to different working environments and achieves the optimal information utilization to the fullest extent as possible. An implementation method for the GPS software receiver comprises the following steps of: independently regulating the tracking bandwidth of each tracking channel according to signal strength; combining the advantages of long-term noncorrelation integral and short-term correlation integral to design a tracking loop with high-sensitivity real-time output; realizing real-time estimation of a receiver crystal frequency error model by using a method for estimating fixed intervals; and finally, based on the deep combination, improving capture velocity and tracking dynamic performance of a weak signal. The implementation method for the GPS software receiver can fully use all detectable satellite signals, can improve the tracking dynamic performance of the weak signal by utilizing auxiliaryinformation of INS information, and also accelerates new star search when INS information assistance exists.

Description

Technical field [0001] The present invention provides a method for acquiring and tracking an adaptive GPS software receiver. The method utilizes auxiliary information as much as possible and performs real-time estimation of crystal error to achieve rapid acquisition and stable tracking, and when the signal strength allows Possibly improve the dynamic performance of the tracking channel. A GPS software receiver with low signal-to-noise ratio and high dynamic adaptive adjustment. Background technique [0002] The high sensitivity and high dynamic performance of GPS receivers contradict each other. Generally, high-sensitivity GPS receivers need long-term uncorrelated or correlated integration to capture and track weak signals, and the carrier should not be too maneuverable. The high dynamic GPS receiver limits the length of the correlation integral, which makes weak signals unable to be captured and tracked, and it is easy to lose lock when the signal is interfered. [0003] High-d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/24G01S19/25G01S19/31G01S19/37
Inventor 王可东侯绍东吴镇王海涌张弘
Owner GUANGZHOU HESHENG TEACHING EQUIP CO LTD
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