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Method for solving far-near problem in GNSS pseudo-satellite positioning

A pseudolite, problem technology, applied in the field of GNSS pseudolite positioning, to achieve the effect of low cost

Inactive Publication Date: 2010-11-24
WUHAN UNIV
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Problems solved by technology

[0006] In view of the above problems, the present invention proposes an effective and easy-to-implement method for solving the mid-far-near problem of GNSS pseudolite positioning

Method used

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  • Method for solving far-near problem in GNSS pseudo-satellite positioning
  • Method for solving far-near problem in GNSS pseudo-satellite positioning

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Embodiment Construction

[0015] 1. Theoretical basis

[0016] In the GNSS positioning system, the transmitter (satellite or pseudolite) emits modulated high-frequency electromagnetic waves with navigation information, and the receiver receives these electromagnetic waves, then demodulates the information inside and performs positioning calculations to obtain its own Location.

[0017] Take the C / A code of the L1 band in the GPS system as an example. In the GPS system, the transmission frequency of the L1 band is 1575.42MHz. Y) code modulated. At present, civil receivers can only perform correlation calculations on C / A codes, capture satellite signals, and then perform code tracking and carrier tracking, demodulate navigation messages, and finally perform positioning calculations. In the whole process, the correlation calculation of C / A code is a very critical step. If this step cannot be completed, it is impossible to know which satellite is being received, let alone further tracking, demodulation a...

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Abstract

The invention provides a method for soling a far-near problem in GNSS pseudo-satellite positioning. In the method, the current positioning receiver and a pseudo-satellite per se are not required to be modified at all, the positioning receiver only needs to use a communication link between a receiver and a main control computer to transmit the received signal-to-noise ratio and positioning status of the pseudo-satellite to the main control computer, and the main control computer dynamically changes the launching power or the launching mode and the like of the pseudo-satellite so as to solve the far-near problem.

Description

technical field [0001] The invention belongs to the field of GNSS pseudolite positioning, in particular to a new method for solving the far-near problem. Background technique [0002] GNSS pseudolite positioning technology is to solve the problem that GNSS positioning cannot be performed normally in indoor, underground, tunnel and other areas, using pseudolite to transmit signals, and then the receiver performs calculation and positioning after receiving them. [0003] In the process of GNSS pseudolite positioning, one thing is very different from real satellite positioning, that is, real satellites are located in the sky orbit tens of thousands of kilometers away from the receiver. When their signals reach the receiver, the signal strength of each satellite There is little difference and little influence on each other. The distance between the pseudolite and the receiver is relatively short, usually in the range of a few meters to tens of kilometers. In this range, the sig...

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Application Information

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IPC IPC(8): G01S19/42G01S19/23
Inventor 张涛徐亚明
Owner WUHAN UNIV
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