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Carrier wave tracking method and loop for GPS signal receiver

A carrier tracking loop, GPS signal technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., can solve the problems of complex filtering algorithms and low precision

Active Publication Date: 2014-02-19
CHINA AEROSPACE KEGONG INFORMATION TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a carrier tracking method and a loop for a GPS signal receiver in order to overcome the problem of complex and low-precision filtering algorithms in the prior art

Method used

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  • Carrier wave tracking method and loop for GPS signal receiver
  • Carrier wave tracking method and loop for GPS signal receiver
  • Carrier wave tracking method and loop for GPS signal receiver

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Embodiment

[0141] figure 2 Shown is the FLL that adds the Kalman filter that the present invention designs, by comparing figure 1 It can be seen that the improved FLL of the present invention adds Kalman filtering between the frequency discriminator and the loop filter, and there is a feedback from the loop filter through the data processing module to the Kalman filtering module. loop, which is an essential, critical feedback loop. image 3 Shown is the PLL designed by the present invention with Kalman filtering added. Kalman filtering is added between the phase detector and the loop filter. There is also a feedback loop. The difference from FLL is that there is no data processing link in the middle.

[0142] Such as Figure 4 As shown, Kalman filtering is divided into two processes: prediction and filtering. On the premise of estimating the initial values ​​of the state variables and the error covariance matrix, the state variables and the error covariance matrix are calculated forw...

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Abstract

The invention provides a carrier wave tracking method and loop for a GPS signal receiver. The method comprises the steps that 101) a GPS satellite signal is received by an antenna, and down conversion and related processing are implemented on the received GPS satellite signal to obtain related results; 102) the related results are input into a discriminator to calculate the frequency or phase difference between the received signal and a local signal, wherein the discriminator is a frequency discriminator when a carrier loop is a frequency locked loop, and the discriminator is a phase discriminator when the carrier loop is a phase locked loop; 103) a discrimination result is filtered via a Kalman filter; and 104) an output result after filtering update is then input into a loop filter for filtering, a carrier-wave Doppler frequency is further output, and local carrier waves are generated according to the carrier-wave Doppler frequency and a carrier-wave frequency. According to the invention, the carrier loop in the tracking loop is improved and optimized via improved Kalman filtering, thereby simplifying calculation while greatly improving the tracking precision for high-sensitivity GPS signals.

Description

technical field [0001] The invention relates to the field of satellite navigation receivers, in particular to a carrier tracking method and a loop of a GPS signal receiver. Background technique [0002] GPS (Global Positioning System) has omnipotent, global, all-weather, continuous and real-time navigation, positioning and timing functions, and can provide users with precise three-dimensional coordinates, speed and time. GPS technology is widely used in civil and military fields, and has produced excellent economic and social benefits, and has become an indispensable and important technical means in the information age. Satellite navigation receiver technology is an important part of GPS technology, which directly affects the functions of GPS positioning and timing. [0003] Traditional navigation receivers are generally used in environments with strong navigation signals such as the surface and outdoors. In these environments, navigation signals are not affected by shadowi...

Claims

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Application Information

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IPC IPC(8): G01S19/29
CPCG01S19/29G01S19/37
Inventor 欧春湘代栋敏
Owner CHINA AEROSPACE KEGONG INFORMATION TECH RES INST
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