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Frequency tracking method and device for positioning system

A frequency tracking and positioning system technology, applied in the field of frequency tracking and its devices for positioning systems, can solve the problems of tracking signal frequency offset, positioning system navigation speed and direction error, etc.

Inactive Publication Date: 2013-07-24
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ideally track the signal frequency (f TRK ) needs to be equal to the line-of-sight signal frequency (f 1 ), but the existing technology does not estimate the influence of the multipath signal on the frequency, so the frequency of the tracking signal will be shifted by the influence of the multipath signal, and the signal frequency and the frequency of the multipath signal (f 2 ) can have a difference of up to 40 hertz (Hz), and the frequency of the tracking signal and the direct-view signal can have a difference of up to 30 Hz, resulting in a huge error in the navigation speed and direction of the positioning system

Method used

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  • Frequency tracking method and device for positioning system
  • Frequency tracking method and device for positioning system
  • Frequency tracking method and device for positioning system

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Embodiment Construction

[0032] figure 2 It is a flowchart of a frequency tracking method for a positioning system according to an embodiment of the present invention. Step 220 is to receive a two-path baseband signal including a light-of-sight signal (LOS for short) and a multipath signal (MP for short), which can be expressed as:

[0033] r ( t ) = A 1 c ( t - τ 1 ) e j ( 2 π f 1 t + θ 1 ) + A 2 c ( t - ...

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Abstract

The invention discloses a frequency tracking method and device for a positioning system. The method comprises the following steps: receiving a fundamental frequency signal, wherein the fundamental frequency signal comprises a light-of-sight signal and a multipath signal; generating a cost function according to a plurality of equidistant frequencies, the fundamental frequency signal and signal averaging energy; and generating an estimated light-of-sight signal frequency according to the cost function.

Description

technical field [0001] The present invention relates to a positioning method and its device, in particular to a positioning system frequency tracking method and its device. Background technique [0002] The former Soviet Union launched the first artificial satellite Sputnik I (Sputnik I), declaring that mankind has entered the space age, and the utilization of space resources has become an important topic of research and development in various countries. The global positioning system (Global Positioning System, referred to as GPS) originated from the navigation system of the U.S. Navy, and then the U.S. Department of Defense continued the plan to complete a global system that uses satellites as positioning tools. [0003] The U.S. Department of Defense divides the entire GPS program into three stages, including the research and development period, the test period, and the maturity period. After the plan enters the maturity period, it will be open to civilian use. GPS is als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/02
Inventor 杨子颐何建纬
Owner MEDIATEK INC