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Implementation method for self-adaptive GPS software receiver

A software receiver and self-adaptive technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as 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 tracking stability

Inactive Publication Date: 2010-09-22
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, which are out-of-lock state, refined state, ready state, and tracking state. The processing of the channel to the input intermediate frequency signal depends on the state of the channel, and the state may change after the processing is completed. , state transitions such as Figure 11 shown. The processing methods in each state are introduced respectively below. The out-of-lock state and refined state correspond to the capturing process, and the ready state and tracking state correspond to the tracking process.

[0073] 1. capture

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

[0075] 1....

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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 auxiliary information of INS information, and also accelerates new star search when INS information assistance exists.

Description

technical field [0001] The invention provides a capture and tracking method for an adaptive GPS software receiver. The method utilizes auxiliary information as much as possible and performs real-time estimation of the crystal oscillator error to realize fast capture and stable tracking. Potentially improve the dynamic performance of the trace channel. A GPS software receiver that realizes low signal-to-noise ratio and high dynamic self-adaptation. Background technique [0002] The high sensitivity and high dynamic performance of GPS receiver are contradictory to each other. Generally, high-sensitivity GPS receivers need long-term non-correlation or correlation integration to capture and track weak signals, and the carrier should not be too maneuverable. However, the high dynamic GPS receiver has a limit on the length of the correlation integral, which makes weak signals unable to be captured and tracked, and is easy to lose lock when the signal is interfered. [0003] Hig...

Claims

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Application Information

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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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