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Beidou receiver and warm start method thereof

A receiver and hot start technology, which is applied in the field of Beidou navigation, can solve the problems of long startup time of the warm start technology, cannot meet the requirements and influences of the quick start of the Beidou receiver, and achieve the goal of realizing fast positioning after starting up and improving the time for the first positioning Effect

Inactive Publication Date: 2012-11-14
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The disadvantages of auxiliary Beidou technology are: due to the need for a wireless communication network receiving system, the cost is high, and it will cause signal interference, which will affect the already weak satellite signal
[0008] The start-up time of the warm start technology is relatively long, usually about 40s, which still cannot meet the requirements of the Beidou receiver to quickly start
[0009] In the process of realizing the present invention, the inventor found that none of the Beidou receiver start-up schemes in the prior art can meet the requirements of quick start, and a method for quick start of the Beidou receiver is urgently needed

Method used

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  • Beidou receiver and warm start method thereof
  • Beidou receiver and warm start method thereof
  • Beidou receiver and warm start method thereof

Examples

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Embodiment 1

[0051] see figure 1 , which is a schematic flow chart of the Beidou receiver hot start method provided in Embodiment 1 of the present invention, specifically as follows:

[0052] Step 10, the Beidou receiver obtains the time T' when the local satellite signal is received r .

[0053] We know that what satellite positioning needs is the precise position of the satellite participating in the positioning at the current moment and the distance from the satellite to the user at the current moment. In order to calculate the satellite position, we need the valid ephemeris and the transmission time T of the satellite signal t ; In order to get the distance from the satellite to the user, we use the ranging method based on TOA, we need to know the sending time T of the satellite signal t and local reception time T r . The ephemeris can be stored in the memory of the receiver, and the local time can be recorded by the RTC unit of the receiver. Therefore, if you want to locate quick...

Embodiment 2

[0087] see image 3 The embodiment of the present invention provides a Beidou receiver, including a receiving time unit 100, a transmitting time estimating unit 200, a last positioning calculation unit 300, a transmitting time reconstruction unit 400, an error adjustment unit 500, and a calculating and positioning unit 600, specifically as follows:

[0088] The receiving time unit 100 is used to obtain the time T' of receiving satellite signals locally r .

[0089] The transmission moment estimation unit 200 is used for receiving the satellite signal locally according to the moment T' r Calculate roughly estimated satellite signal launch time T te .

[0090] The last positioning calculation unit 300 is used to roughly estimate the satellite signal transmission time T according to the satellite te Calculate the distance and propagation time from the satellite to the last location of the user.

[0091] The launch time reconstruction unit 400 is used to reconstruct the sate...

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Abstract

The invention discloses a Beidou receiver and a warm start method thereof. The warm start method of the Beidou receiver comprises the following steps of: obtaining the time T'r of a local receiving satellite signal; according to T'r, calculating a roughly-estimated satellite signal emission moment Tte; obtaining the coordinate of a satellite at the roughly-estimated satellite signal emission moment Tte; calculating the distance and the transmission time of the satellite to the last-time user positioning position; reconstructing a satellite signal emission moment T't with a error delta; according to the satellite signal emission moment T't, calculating the transmission time; comparing the transmission time with real satellite transmission time delta T to obtain the value of the error delta; regulating the error delta to add the error delta into the signal calculation of each satellite required by positioning; calculating a pseudorange; and carrying out a least square method to resolve a positioning result to finish the warm start. According to the warm start method of the Beidou receiver, which is disclosed by the invention, the first-time positioning time of the Beidou receiver can be improved, and a purpose of starting-up quick positioning is realized.

Description

technical field [0001] The invention relates to the technical field of Beidou navigation, in particular to a Beidou receiver and a hot start method thereof. Background technique [0002] The application of satellite navigation system is becoming more and more extensive, and it is gradually developing towards high precision, high sensitivity, fast positioning and high dynamic navigation. Among them, the fast positioning ability of the satellite navigation receiver is one of the important indicators of the receiver application, especially in the field of emergencies and military applications. Time to First Fix (TTFF) refers to the time it takes for the receiver to obtain the first positioning result after it is started. Under different startup conditions, the average time to first fix of the receiver is different, ranging from a few seconds to 60 seconds. Second. [0003] Beidou Satellite Navigation and Positioning System (GNSS, Global Navigation Satellite System) is a satel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/13G01S19/27
Inventor 邓中亮刘竞超杨磊尹露席岳李晓敏詹中伟王冠一董慧
Owner BEIJING UNIV OF POSTS & TELECOMM
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