Ephemeris collection device and method thereof

A collection device and ephemeris technology, applied in the direction of measuring devices, satellite radio beacon positioning systems, instruments, etc., can solve the problems of reducing the TTFF performance of the receiver, the receiver cannot complete synchronization, etc., and achieve the effect of saving ephemeris collection time
CN104181557AInactive Publication Date: 2014-12-03AOTU ELECTRONICS WUHAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AOTU ELECTRONICS WUHAN
Publication Date
2014-12-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present disclosure discloses an ephemeris collection device and a method of collecting ephemeris data. The ephemeris collection device may include a data storage unit, configured to store a first part of a first ephemeris subframe if a synchronization of the first ephemeris subframe is not completed; and a subframe merge unit, coupled with the data storage unit and configured to receive a second part of the first ephemeris subframe from the subframe synchronizer and retrieve the first part of the first ephemeris subframe from the data storage unit during a subsequent transmission of the first ephemeris subframe. A complete first ephemeris subframe is obtained based on the first part and the second part of the first ephemeris subframe.
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Description

technical field

[0001] The present invention relates to an ephemeris collection device and its method, in particular to an ephemeris collection device and its method that use subframe synchronization data to improve the Time To First Fix (TTFF) performance of a satellite receiver cold start . Background technique

[0002] Currently, satellite positioning is widely used in various applications, and many parameters are utilized to evaluate the performance of a positioning system receiver, such as a Global Positioning System (GPS) receiver or a Global Navigation Satellite System (GLONASS) receiver. One such parameter is the time delay (also known as TTFF) from when the receiver is turned on until the receiver determines its current position. In general, the receiver with the shortest TTFF is preferred. However, the TTFF of conventional GPS receivers can range from 30 seconds to several minutes. The situation is even worse if the receiver is in a cold start state (meaning no ...

Claims

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