GNSS text demodulation method and device and satellite navigation receiver

A telegram and demodulation technology, applied in the field of satellite positioning and navigation, can solve the problem of long time for the first positioning, and achieve the effect of shortening the time for the first positioning

Inactive Publication Date: 2018-04-06
ARKMICRO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method, device, readable storage medium and satellite navigation receiver for GNSS message demodulation, aiming to solve the problem that the first positioning time is relatively long because the message demodulation is started after the in-position synchronization is successful. question

Method used

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  • GNSS text demodulation method and device and satellite navigation receiver
  • GNSS text demodulation method and device and satellite navigation receiver
  • GNSS text demodulation method and device and satellite navigation receiver

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Embodiment 1

[0031] see figure 1 The method for GNSS message demodulation provided by Embodiment 1 of the present invention includes the following steps: It should be noted that if there are substantially the same results, the method for GNSS message demodulation of the present invention does not use figure 1 The flow sequence shown is limited.

[0032] S101. After the satellite is captured successfully, the control starts the main tracking channel and N auxiliary tracking channels at the same time, where N is a natural number.

[0033] In Embodiment 1 of the present invention, S101 may specifically be:

[0034] After the satellite is captured successfully, calculate the preliminary signal-to-noise ratio, and if the signal-to-noise ratio is higher than the preset threshold, the control starts the main tracking channel and N auxiliary tracking channels at the same time.

[0035] In Embodiment 1 of the present invention, S101 specifically includes the following steps:

[0036] Obtain the ...

Embodiment 2

[0053] see figure 2 The device for GNSS message demodulation provided by Embodiment 2 of the present invention includes:

[0054] The tracking channel starting module 11 is used to control the simultaneous start of the main tracking channel and N auxiliary tracking channels after the satellite capture is successful, wherein N is a natural number;

[0055] The tracking channel control module 12 is used to control the main tracking channel to perform bit synchronization, control one of the auxiliary tracking channels to open the message demodulation to obtain the navigation bit data stream, and control the remaining N-1 auxiliary tracking channels to delay the preset time interval to start the message demodulation to obtain the navigation bit data stream;

[0056] The frame synchronization module 13 is used to perform frame synchronization on the navigation bit data streams obtained after the N auxiliary tracking channels are respectively opened for demodulation of the message...

Embodiment 3

[0062] Embodiment 3 of the present invention also provides a readable storage medium, the readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for demodulating GNSS messages as provided in Embodiment 1 of the present invention is implemented. A step of.

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Abstract

The invention provides a GNSS text demodulation method suitable for the navigation field. The method comprises that a main tracking channel and N auxiliary tracking channels are started after that a satellite is captured successfully; bit synchronization of the main tracking channel is controlled, one auxiliary tracking channel starts text demodulation, and the other N-1 auxiliary tracking channels start text demodulation successively by being delayed at preset time intervals; frame synchronization is carried out on navigation bit data streams obtained by the N auxiliary tracking channels; after successful bit synchronization of the main tracking channel, text demodulation of the main tracking channel is controlled; whether frame synchronization of the navigation bit data stream of a random auxiliary tracking channel succeeds is determined, if YES, a navigation bit data stream obtained by the main tracking channel continues collecting ephemeris, and the N auxiliary tracking channels are released; and otherwise, the navigation bit data stream obtained by the main tracking channel is used to carry out frame synchronization and collect ephemeris, and the N auxiliary tracking channelsare released. According to the invention, time of first positioning can be shortened effectively needless of adding too many hardware resources.

Description

technical field [0001] The invention belongs to the field of satellite positioning and navigation, in particular to a method and device for GNSS message demodulation and a satellite navigation receiver. Background technique [0002] At present, the Global Navigation Satellite System (GNSS) includes GPS of the United States, GLONASS of Russia, Galileo system of the European Union, and Beidou Navigation System (BDS) of China. The GNSS system aims to provide users with satellite navigation and positioning around the clock Serve. Taking the GPS system as an example, the system consists of three parts, namely the space part, the ground part and the user device part. The space part consists of 24 satellites (the actual number of satellites in normal operation is about 30), distributed in 6 orbits, and four satellites are unevenly distributed in each orbit. Each satellite on part of the space constellation transmits navigation signals to the ground. The ground monitoring part de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24
CPCG01S19/243
Inventor 阳金金刘俊秀严卫健石岭
Owner ARKMICRO TECH
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