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Double replacement rate carrier tracking loop circuit

A technology of carrier tracking loop and update rate, which is applied in automatic control of power, radio wave measurement system, beacon system using radio wave, etc., and can solve problems such as complex calculations

Active Publication Date: 2010-09-01
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its disadvantage is that the calculation is complicated, and at the same time it still does not avoid those shortcomings of the optimal linear combination method

Method used

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  • Double replacement rate carrier tracking loop circuit
  • Double replacement rate carrier tracking loop circuit
  • Double replacement rate carrier tracking loop circuit

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Embodiment Construction

[0111] For satellite positioning receivers, all of them are spread spectrum signals, so the data branch and the pilot branch are modulated with spread codes. Since in the design of the receiver, the spreading code tracking loop and the carrier tracking loop work relatively independently, it can be assumed that the spreading code has been well stripped from the signal, and the IF signal of the data branch only has the carrier and data bits. There is only carrier on the IF signal of the pilot branch.

[0112] In addition, for the relative phase relationship between the data branch and the pilot branch in different signals, the output of the NCO may be different. If the pilot branch is in phase quadrature with the data branch carrier, there needs to be a 90 degree phase shift between the locally reproduced carriers fed by the NCO to the two coherent integrators. There are also some signals where the data and pilot branches are in phase and separated only by using different sprea...

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Abstract

The present invention provides a double renewal rate carrier-tracking loop, which belongs to the field of global positioning system technology. The present invention is characterized in that the present invention comprises a data branch coherent integrator, a Costas phase detector which is connected with the data branch coherent integrator, a pilot branch coherent integrator, a coherent phase detector which is connected with the pilot branch coherent integrator, a loop filter used for integrating the data signal and the pilot signal after phase detecting and a data controlling oscillator usedfor forming a phase-locked loop. The coherent integration time of the data branch is the integer multiples of the pilot branch. Different filtering coefficient is adapted when the data branch does not act and when the data branch and the pilot branch all act. The total renewal rate takes the smaller one of the two branch coherent integration times. The present invention not only improves the renewal rate of the loop but also reinforces the anti-dynamic performance of the loop. In addition, the data branch using the coherent integration with longer time can reduce square loss. Correspondingly,the anti-noise performance and the anti-dynamic performance of the Costas ring of the data branch are improved.

Description

technical field [0001] The invention belongs to the field of carrier tracking loops, in particular to a carrier tracking loop that simultaneously tracks data branches and pilot frequency branches. As long as two channels of direct spread spectrum signals are simultaneously transmitted on the same frequency, one channel has data bits and the other channel has no data bits, the receiving end can use the present invention to perform carrier synchronization and measurement, which improves stability and accuracy compared with traditional methods. Background technique [0002] In the Global Navigation Satellite System (GNSS) receiver, the carrier observation value can be obtained from the carrier tracking loop, and its accuracy is generally several orders of magnitude higher than the pseudo-range measurement value, so in applications with high precision requirements Play an important role. Moreover, it is also possible to use the carrier tracking loop to track the dynamics to ass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/02G01S5/02H03L7/08H03L7/085H03L7/093H03K17/687G01S19/29
Inventor 姚铮崔晓伟陆明泉冯振明
Owner TSINGHUA UNIV
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