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Global position system (GPS) signal tracking method, tracking channel loop and adjusting method thereof

A GPS signal and tracking channel technology, applied in the field of satellite-based navigation, can solve the problems of integration time, loop bandwidth and loop average loss of lock time, loop loss of lock, probability increase, etc.

Active Publication Date: 2011-04-06
HERONAV BEIJING TECH DEV
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Problems solved by technology

When the signal strength is weak, it is necessary to increase the coherent integration time and reduce the loop bandwidth to obtain a higher signal-to-noise ratio to ensure the tracking of the signal phase, but increasing the coherent integration time and reducing the loop bandwidth will lead to loop loss. Increased probability of lock
With the further reduction of the signal level, the contradiction between the integration time, the loop bandwidth and the loop average lock-out time limits the existing tracking algorithm for the signal phase to track the GPS signal in indoor and other weak signal strength environments

Method used

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  • Global position system (GPS) signal tracking method, tracking channel loop and adjusting method thereof
  • Global position system (GPS) signal tracking method, tracking channel loop and adjusting method thereof
  • Global position system (GPS) signal tracking method, tracking channel loop and adjusting method thereof

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[0054] In order for those skilled in the art to further understand the features and technical contents of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. The accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

[0055] The technical solutions of the present invention will be described below in conjunction with the drawings and embodiments.

[0056] refer to figure 2 , is a flow chart of a GPS signal tracking method according to an embodiment of the present invention.

[0057] The method can include:

[0058] Step 201, receiving a radio frequency signal transmitted by a satellite.

[0059] The receiving process is similar to the prior art, and will not be repeated here.

[0060] Step 202: Perform down-conversion processing on the radio frequency signal according to the pre-acquired signal generated by the carrier numerically ...

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Abstract

The invention provides a global position system (GPS) signal tracking method, a tracking channel loop and an adjusting method thereof. The GPS signal tracking method comprises the following steps: A. receiving a radio-frequency signal launched by a satellite; B. carrying out down-conversion processing on the radio-frequency signal according to the previously obtained signal generated by a carriernumerical controlled oscillator (NCO), and obtaining a signal after down-conversion; and C. carrying out coherent accumulation and incoherent accumulation on the frequency of the down-conversion signal according to the previously obtained signal generated by a code NCO so as to obtain tracking data of the radio-frequency signal. In the embodiment of the invention, after the radio-frequency signalis subjected to down-conversion processing, the integral time is increased by calculation of coherent accumulation and incoherent accumulation and the signal processing gains are increased, thus ensuring GPS signal frequency tracking at indoors and other environments with weaker signal strength, and realizing GPS weak signal tracking.

Description

technical field [0001] The invention relates to the technical field of satellite-based navigation, in particular to a GPS signal tracking method, a tracking channel loop and an adjustment method thereof. Background technique [0002] GPS (Global Positioning Systems, Global Positioning System) is a system that can realize continuous, real-time and three-dimensional positioning. It consists of 24 satellites deployed in space, a ground control station and user receivers. [0003] The 24 satellites in the space continuously transmit their own proprietary pseudo-random codes and navigation data messages. After the user receiver captures the signals transmitted by the satellites, it obtains the carrier frequency and code phase of the satellites, and then can demodulate the navigation data messages for use in Positioning of end-user receivers. However, the receiver can only obtain the approximate values ​​of the carrier frequency and code phase during the acquisition process, so a...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S1/02
Inventor 董亮龚相铱杨诗明陈文权
Owner HERONAV BEIJING TECH DEV
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