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Double replacement rate carrier tracking loop circuit

A technology of carrier tracking loop and update rate, which is applied in the field of phase-locked loop, and can solve problems such as complex calculations

Active Publication Date: 2008-05-21
TSINGHUA UNIV
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  • Summary
  • 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

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

Examples

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

[0112] In addition, according to 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 and the data branch carrier are in quadrature, a 90-degree phase shift is required between the local recurrence carriers sent by the NCO to the two coherent integrators. There are also some signals whose data branch and pilot branch are in phase, and are only separated by u...

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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 used for 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 present invention is a phase locked loop for simultaneously tracking data and pilot branches. It relates to the field of global positioning technology, especially the carrier tracking method in GPS and Galileo modern signal receivers with both data branch and pilot frequency branch. But it is not limited to the global positioning technology, as long as two signals are simultaneously transmitted on the same frequency, and there are data bits on one path and no data bits on the other path, the receiving end can use the present invention to perform carrier synchronization and measurement, which is higher than the traditional method. stability and precision. 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 h...

Claims

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Application Information

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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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