Method for correcting multiple constellation SBAS system time difference

A multi-constellation, satellite navigation system technology, applied in the field of system time difference correction

Inactive Publication Date: 2008-11-05
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention provides a multi-constellation SBAS system time difference correction method, which can solve the multi-constellation SBAS system time difference calculation problem, and provides the broadcasting method of the system time difference and the calculation method of the integrity information corresponding to the system time difference

Method used

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  • Method for correcting multiple constellation SBAS system time difference
  • Method for correcting multiple constellation SBAS system time difference
  • Method for correcting multiple constellation SBAS system time difference

Examples

Experimental program
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Embodiment

[0120] Embodiment: Utilize China's satellite-based augmentation system-SNAS to monitor GPS satellites and Galileo satellites, select 30 reference stations to form the SNAS monitoring network, wherein there are 5 clock synchronization stations, and the simulation time is 2400 seconds. The reference time system is the Beidou time system followed by SNAS. SNAS will provide users in the service area with the system time difference correction number between GPS, Galileo system and the reference system and the integrity information of the system time difference correction.

[0121] Step 1: Determine the reference time system, and determine the number of system time differences that SBAS needs to calculate according to the number of satellite navigation systems.

[0122] Determine the reference time system as the Beidou time system, and the number m of satellite navigation systems is 2, which are GPS and Galileo systems. Since the GPS and Galileo time systems are inconsistent with th...

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Abstract

The present invention discloses a method for correcting the time-difference of a multiple-constellation SBAS system, and the method comprises the following steps: a step1, confirming a reference time system, confirming the number of the system time-difference required calculating by the SBAS according to the number of satellite navigation system; a step2, calculating the system time-difference between different satellite navigation system and the reference system; a step3, establishing a time-difference model of the multiple-constellation SBAS system and confirming the broadcast parameter; and a step 4, calculating the wholeness information of the system time-difference. The invention can settle the problem of time-difference resolving of the multiple-constellation SBAS system, and provide a broadcast parameter of the system time-difference and a method for calculating the wholeness information of the system time-difference.

Description

technical field [0001] The invention belongs to the field of satellite navigation and relates to a system time difference correction method based on a multi-constellation satellite-based augmentation system (SBAS). Background technique [0002] SBAS is a wide-area differential system that uses GEO as a communication link to provide GNSS differential correction data and integrity information. Its goal is to meet the navigation system requirements of civil aviation from the en route flight stage to the vertical guidance precision approach stage. Existing SBAS include WAAS in the United States, EGNOS in Europe, SNAS in China, MSAS in Japan and GAGAN in India. [0003] The existing SBAS is an independent regional system, which can only provide differential correction data and integrity information for its own navigation system. However, with the continuous development of GPS modernization and the maturity of Galileo system and my country's Beidou system, the multi-constellation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/00G01S5/02G01S19/02G01S19/20
Inventor 李锐马小辉杨婷黄智刚张军朱衍波
Owner BEIHANG UNIV
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