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Simulator of GNSS receivers

A technology of receiver and simulator, applied in the field of GNSS receiver simulator, to meet the verification requirements and achieve the effect of rich data content

Inactive Publication Date: 2014-01-08
WUHAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] (1) The high-precision GNSS receiver simulator needs to obtain real-time satellite ephemeris, and the ephemeris data must be directly received by the satellite, and the receiver simulator is a virtual The receiver cannot obtain ephemeris data;
[0008] (2) If you want to obtain real-time satellite ephemeris, you must have a real receiver to obtain it from the satellite
The ephemeris data of GNSS satellites is generally updated every 1-2 hours, and each receiver can only receive ephemeris data of a part of satellites at a time point (limited by visible satellites), so only one Receiver cannot obtain complete ephemeris data for all satellites

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  • Simulator of GNSS receivers

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Embodiment Construction

[0026] The basic requirement of a high-precision GNSS receiver is to output the original observations, which at least contain information such as pseudorange, carrier phase, Doppler frequency shift, and signal-to-noise ratio of each satellite. To generate this information, the required conditions are the receiver's position, velocity, time, and satellite ephemeris or almanac. The receiver's position, speed, and time information can be input by the user, but the satellite ephemeris is updated regularly (for example, the update cycle of the broadcast ephemeris is 1-2 hours), so if you want to get the correct original observations, you must update it in real time ephemeris data. The latest broadcast ephemeris data is broadcast by satellites and must be obtained by a real GNSS receiver, and the GNSS receiver simulator itself cannot receive ephemeris. Therefore, the present invention proposes to implement the GNSS receiver simulator with the client-server mode, and the real GNSS r...

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Abstract

The invention discloses a simulator of GNSS receivers. The simulator of the GNSS receivers comprises servers, the GNSS receivers and clients, wherein the servers are connected with the GNSS receivers, and are used for obtaining time data and observation data of satellites and ephemeris data and almanac data of the satellites from the GNSS receivers in a real-time mode, and communication is carried out between the servers and the clients through a network. The high-precision simulator of the GNSS receivers can serve thousands of clients at the same time, and provide the observed quantity similar to observed quantity in reality, and operating experience, similar to operating experience on real receivers, on the receivers, the risk of damage does not exist, a user can carry out operation at will, the teaching effect of related courses of an GNSS is greatly improved, a flexible data generation platform is provided for data processors of the GNSS, a large amount of time for data collection can be saved, and efficiency of development and efficiency of verification are greatly improved.

Description

technical field [0001] The invention belongs to the field of GNSS satellite positioning, in particular to a GNSS receiver simulator. [0002] Background technique [0003] The role of the GNSS receiver simulator is to simulate a real GNSS receiver and output GNSS measurement data according to user needs. It has a wide range of applications and can be used for testing satellite positioning equipment, testing precise positioning algorithms, and learning receiver operations. [0004] In terms of application, GNSS receivers can be divided into three categories. One is GNSS receivers for civil navigation. The single-point positioning accuracy of this type of receiver is meter level, and generally does not have differential positioning functions. The output is in NMEA0183 format. Positioning information; the second type is GNSS receivers for high-precision industry applications. The single-point positioning accuracy of this type of receiver is meter level, and the differential ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/14H04L29/06
CPCG01S19/13G01S19/20
Inventor 张涛花向红
Owner WUHAN UNIV
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