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Carrier wave tracking system and method of GPS coarse / capturing code signal

A carrier tracking and code signal technology, which can be used in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., and can solve problems such as carrier phase difficulties.

Inactive Publication Date: 2009-05-20
许军
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] In addition, the existence of Doppler frequency shift in the actual system is characterized by uncertainty, so it is difficult to track the carrier phase with a fixed bandwidth

Method used

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  • Carrier wave tracking system and method of GPS coarse / capturing code signal
  • Carrier wave tracking system and method of GPS coarse / capturing code signal
  • Carrier wave tracking system and method of GPS coarse / capturing code signal

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] like Figure 4 , the carrier tracking system of the GPS coarse / acquisition code signal of the present invention comprises an input signal, a loop formed by combining a frequency-locked loop and a phase-locked loop for processing the input signal, a frequency discriminator in the loop, A phase detector, a loop filter to filter the frequency and phase detector outputs, and a numerically controlled oscillator (NCO) connected to the output of the loop filter. Different from the traditional phase-locked loop for carrier tracking, the present invention combines the frequency-locked loop with the phase-locked loop. When the frequency error is large, the frequency-locked loop mainly works, which is beneficial to increase the tracking efficiency. The loop bandwidth makes it easier to lock the phase; when the frequency error is small, the phase-locked loo...

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Abstract

The invention provides a carrier tracking system of a GPS coarse / acquisition code signal and a method thereof. The system comprises an input signal, a loop circuit, a frequency discriminator in the loop circuit, a phase discriminator, a loop circuit filter and a numerical controlled oscillator (NCO), wherein the loop circuit is used for processing the input signal, and is combined by a frequency locked loop and a phase locked loop; the loop filter filters the output of the phase discriminator and phase discriminator; the numerical controlled oscillator (NCO) is connected with the output of the loop circuit filter. The system combines the frequency locked loop and the phase locked loop, when a frequency error is larger, the frequency locked loop plays the major role to be favorable for improving the bandwidth of a tracked loop, so that phase locking can be more easily; when the frequency error is smaller, the phase locked loop dominates to make the loop bandwidth smaller, so as to reduce noise influence and improve tracking precision.

Description

technical field [0001] The present invention relates to a processing system and method for receiving signals in a Global Positioning System (Global Positioning System, GPS), in particular to a carrier tracking processing system and method for a GPS coarse / acquisition code (Coarse / Acquisition, C / A) signal . Background technique [0002] The GPS global positioning system, as a new generation of satellite navigation and positioning system, was originally developed by the US military and used by the three armed forces. After years of development, the current GPS system has become a widely used military-civilian dual-use system. Its application fields and application prospects far exceed the original imagination of the system designer. In almost all fields such as resource exploration, communication, and meteorology, it is used as a very important technical means and method for navigation, timing, positioning, measurement of geophysical parameters, and measurement of atmospheric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02G01S5/14G01S19/37
Inventor 周加铳赖建文
Owner 许军
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