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Pseudolite time synchronization method and positioning method thereof

A time synchronization, pseudolite technology, applied in the field of satellite navigation, can solve the problems of complex technology, high cost, difficult implementation, etc., and achieve the effect of simple implementation and low hardware cost

Inactive Publication Date: 2014-09-24
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, some of these technologies are costly, and some are complex and difficult to implement

Method used

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  • Pseudolite time synchronization method and positioning method thereof
  • Pseudolite time synchronization method and positioning method thereof
  • Pseudolite time synchronization method and positioning method thereof

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Embodiment Construction

[0042] The principle diagram of a pseudolite time synchronization positioning method of the present invention is as follows figure 1 As shown, including pseudolite time synchronization process and pseudolite user positioning process. which is:

[0043] Step 1, add a reference station in the space; the position of the reference station is fixed, and the three-dimensional position is known in advance;

[0044] Step 2, the atomic clock of the reference station produces accurate reference time; the signal processing module of the reference station encodes the reference time generated by the atomic clock, the three-dimensional position of the reference station and the serial number of the reference station, and the coded information and the spread spectrum of the reference station The code is spread-spectrum modulated, and the spread-spectrum reference signal is then subjected to carrier modulation and up-conversion; finally, it is transmitted through the transmitting antenna of t...

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Abstract

The invention discloses a pseudolite time synchronization method and a positioning method thereof. The reference station is provided with a high-accuracy clock, such as a rubidium atomic clock, and a synchronization signal is transmitted by the reference station; the signal transmitted by the reference station is received by pseudolite stations synchronously, signal processing and timing calculation are performed to obtain a high-accuracy timing result, and the local locks of the pseudolite stations are corrected; and a distance measuring signal is transmitted by each pseudolite station under the control of the local lock. In the pseudolite user positioning process, the pseudolite user receives the signals transmitted by the pseudolite stations, and signal processing is performed to obtain a positioning result of the user. According to the invention, advantages of simple implementation and low hardware cost can be realized.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to a pseudolite time synchronization and a positioning method thereof. Background technique [0002] Due to some congenital factors of the satellite navigation system itself, there are some insurmountable weaknesses. For example, satellite navigation signals are very weak and are susceptible to intentional and unintentional interference; secondly, satellite navigation is completely dependent on the reception of satellite radio signals, and when satellites are poorly distributed or in poor health, the stability and reliability of the entire system will suffer. Affected; especially the satellite always maintains a high altitude angle above the receiver antenna, resulting in an unreasonable satellite collection graphic structure, which fundamentally limits the accuracy of altimetry. Pseudo-satellites are proposed under such circumstances, and these problems can be solved by using p...

Claims

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Application Information

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IPC IPC(8): G04R20/02G01S19/42
Inventor 孙希延纪元法孙希刚邓洪高符强严素清吴孙勇王守华肖建明廖桂生
Owner GUILIN UNIV OF ELECTRONIC TECH
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