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Method for autonomous ephemeris prediction of GPS receiver

A technology of GPS receiver and ephemeris, which is applied in the direction of measuring device, radio wave measurement system, satellite radio beacon positioning system, etc., can solve the problem of not being able to significantly improve the time length of the first positioning

Active Publication Date: 2019-05-10
西安开阳微电子有限公司
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Problems solved by technology

Although it can speed up GNSS signal acquisition at present, it does not significantly improve the time to first fix

Method used

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  • Method for autonomous ephemeris prediction of GPS receiver
  • Method for autonomous ephemeris prediction of GPS receiver
  • Method for autonomous ephemeris prediction of GPS receiver

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Embodiment Construction

[0271] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or elements need not be limited to those steps explicitly listed or units, but may include other steps or units not explicitly listed o...

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Abstract

The invention discloses a method for autonomous ephemeris prediction of a GPS receiver. The method comprises the following steps: step one, computing a location speed vector of a satellite in ephemeris effective time according to input broadcast ephemeris as an observation value of precise orbital determination; step two, performing precise orbital determination according to the observation value,computing by utilizing an orbital determination program to obtain a precise location speed vector at initial moment of an orbital determination segmental arc, and a satellite area-mass ratio in a solar radiation pressure model parameter; step three, performing orbital forecast, taking the precise location speed at the initial moment of the orbital determination segmental arc as the starting, taking the satellite area-mass ratio as the satellite equivalent area-mass ratio parameter to perform orbit extrapolation, and extrapolating to turn-on moment; and step four, fitting the location speed quantity at the turn-on moment as the broadcast ephemeris to give out the forecast ephemeris, and directly applying the forecast ephemeris to positioning resolution of a receiver location. The first positioning duration of the receiver not in warm start is greatly shortened, a requirement on a chip storage space is reduced, and the cost control of the chip is convenient.

Description

technical field [0001] The invention belongs to the field of GPS receivers, and relates to a method for autonomously predicting ephemeris by GPS receivers. Background technique [0002] With the development of automobile and electronic computer technology and the improvement of people's living needs, the global satellite positioning system (GPS) has been widely used, and more and more people have begun to use GPS receivers and navigation systems. GPS receivers are developing rapidly in fields such as vehicle navigation and mobile consumer electronics. With the continuous expansion of application fields and the rapid increase of user groups, users have put forward more and more requirements for the functions and performance of GPS receivers, such as sensitivity (Sensitivity) and positioning accuracy (Accuracy). In addition, the time to first fix (TTFF, Time To First Fix) after power-on is also a very important performance indicator. Users want to be able to locate within a ...

Claims

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Application Information

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IPC IPC(8): G01S19/27
Inventor 邢逢峰汤加跃
Owner 西安开阳微电子有限公司
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