Local positioning method and system based on satellite orbit information

Abstract

The invention relates to navigational positioning systems, and discloses a local positioning method and system based on satellite orbit information. A terminal acquires ephemeris data, in all time periods within the preset time length from the current time, of at least N satellites from a server, wherein N is larger than or equal to four. The terminal stores the acquired ephemeris data in a local database, when positioning information of the terminal needs to be acquired, the ephemeris data in the corresponding time periods are acquired from the local database according to the current time, satellite signals are captured and traced according to the ephemeris data acquired from the local database, local coordinates are calculated according to the captured and traced satellite signals, and the positioning information of the terminal is obtained. The terminal with the positioning function can be precisely positioned even though the terminal is under the condition without an auxiliary positioning network or the condition of the severe environment or the extreme weather.

Description

technical field [0001] The invention relates to a navigation and positioning system, in particular to a local positioning technology based on satellite orbit information. Background technique [0002] The positioning and navigation technology based on satellite signals has developed rapidly in the past two decades, and has gradually entered people's daily life from the exclusive application field. At present, there are several sets of global satellite positioning systems in the world: the Beidou system in my country, the GPS system in the United States, the GLONASS system in Russia, and the Galileo system in cooperation between China and Europe. Whether it is GPS positioning, GLONASS positioning, Big Dipper positioning or Galileo positioning, the main control station on the ground collects the observation data and meteorological information of each monitoring station, calculates the ephemeris of each satellite and the correction number of satellite clock, according to the re...

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Problems solved by technology

[0003] However, when the environment is relatively harsh or the weather is relatively extreme, situations such as abnormal signals or no signal reception may occur from time to time, and the realization of these positioning system functions requires the help of the network from time to time. The current A-GNSS (Global Because there is no ephemeris extrapolation, the satellite navigation aid system) service can only obtain the current service (obtain ephemeris information) within a short period of time (2 hours) from A-GNSS. If you need fast positioning after 2 hours, you need Obtain new data from the A-GNSS server. Therefore, the A-GNSS service will not be available in places where the network cannot be covered or the network is unstable, or where the network cannot be connected for a long time. , these will seriously affect the receiver's capture of satellite signals, and then it will be difficult to complete real-time positioning, which will bring a lot of inconvenience to people's daily production and life

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