Navigation satellite signal receiver and cold start method thereof

A navigation satellite and receiver technology, applied in the field of satellite navigation and positioning, can solve the problem of long time-consuming cold start of the navigation satellite signal receiver, and achieve the effects of increasing speed, fast cold start, and saving time
CN104777490AInactive Publication Date: 2015-07-15GUANGDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Publication Date
2015-07-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a navigation satellite signal receiver and a cold start method thereof. The cold start method comprises the following steps: receiving navigation message data of a plurality of satellites, performing bit synchronization on the navigation message data, and storing the navigation message data subjected to bit synchronization; performing frame synchronization on the navigation message data, and after finishing frame synchronization, obtaining TOW and subframe number of a current subframe; determining a subframe number of a previous subframe according to the current subframe number, if the subframe number of the previous subframe is 1, 2 or 3, performing backward research on navigation message data of the previous subframe to obtain partial ephemeris data, and storing the partial ephemeris data into an ephemeris storage region; continuously receiving the navigation message data, storing ephemeris data in the navigation message data into the ephemeris storage region, after obtaining complete ephemeris data of a first subframe, a second subframe and a third subframe, decoding the ephemeris data, and obtaining all ephemeris parameters; after obtaining ephemeris parameters of a preset number of satellites, starting to perform positioning. The cold start method realizes quick cold start of the navigation satellite signal receiver.
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Description

technical field

[0001] The invention relates to the field of satellite navigation and positioning, and more specifically, to a navigation satellite signal receiver and a cold start method thereof. Background technique

[0002] Global Navigation Satellite System (GNSS) is a satellite-based radio navigation system. The satellite continuously sends its own ephemeris parameters and time information. After receiving the information, the user calculates the three-dimensional position, three-dimensional direction, movement speed and time information of the receiver.

[0003] Taking the Global Positioning System (GPS) as an example, the space segment uses 24 satellites at an altitude of about 20,200 kilometers to form a satellite constellation. The 21+3 satellites are all in near-circular orbits, with a running period of about 11 hours and 58 minutes, distributed on six orbital planes (four satellites per orbital plane), and an orbital inclination of 55 degrees. The distribution ...

Claims

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