Unlock instant, AI-driven research and patent intelligence for your innovation.

Satellite-borne differential GNSS compatible machine test method based on clock synchronization

A technology of clock synchronization and testing methods, which is applied in the direction of measuring devices, radio wave measuring systems, satellite radio beacon positioning systems, etc., to achieve small delay, realize system-level assessment, and realize the effect of testing

Active Publication Date: 2020-09-18
SHANGHAI AEROSPACE CONTROL TECH INST
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of satellite clock error, ephemeris error, ionosphere and troposphere error, receiver clock error and other system errors that are difficult to eliminate for non-difference receivers in single-point positioning, the actual positioning accuracy can only meet within 50m (3σ)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Satellite-borne differential GNSS compatible machine test method based on clock synchronization
  • Satellite-borne differential GNSS compatible machine test method based on clock synchronization
  • Satellite-borne differential GNSS compatible machine test method based on clock synchronization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] Step 1. Separately use a dual-channel oscilloscope to calibrate the simulation response delay of the clock board and the two channels in the dual-carrier GNSS target simulator, for example, record t 1 = 3ms, t 2 = 5ms; then in the delay setting of the main control machine, set the delay supplement of channel 1 to 3ms and that of channel 2 to 5ms, so as to realize the synchronization of two radio frequency signals;

[0042] Step 2, the preset information of the initial point is taken as 13:1:9 on October 2, 2017 (Beijing time), and the corresponding WGS84 system position velocity is [x y z] T =[6506969 -727163 -1846550] T ;[vx vy vz] T =[-718.0875546.157 -4665.4] T

[0043] Step 3, the threshold of the absolute time between the dynamics host computer and the read GNSS target simulator can be set to 20ms. When the read deviation value Δt is not greater than 20ms, the host computer will normally output the simulation without recursion of navigation data Navigation dat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a spacecraft differential GNSS ground test method, in particular to a satellite-borne differential GNSS compatible machine ground test method based on clock synchronization. The method adopted by the invention has the advantages that the real target original observed quantity can be introduced into the differential GNSS compatible machine for pseudorange differential resolving in a system closed-loop test instead of adopting a data forwarding mode, so that the functional performance indexes of the satellite-borne differential GNSS compatible machine can be assessed inreal time in a control closed loop; a double-carrier scene (a target receiver and a satellite-borne differential GNSS compatible machine) is driven in a clock correction and navigation data recursionmode, and the problem of system-level test of high-precision pseudo-range differential positioning of the satellite-borne differential GNSS compatible machine is solved.

Description

technical field [0001] The invention relates to a space vehicle differential GNSS ground test technology, in particular to a clock synchronization-based spaceborne differential GNSS compatible ground test method. Background technique [0002] A GNSS compatible machine is configured on a conventional space vehicle to provide accurate time information and corresponding position and velocity information. According to the navigation principle, single-point positioning can be realized at any time based on 4 navigation constellation satellites. The specific implementation method of the ground test is to set in the GNSS target simulator A set of orbital parameters or a set of off-line orbital data sends the GNSS signal to the GNSS compatible machine through radio frequency. The GNSS compatible machine calculates the navigation information according to the ephemeris and sends it to the GNC computer. Provide accurate time and send it down to the ground measurement and control station...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/23
CPCG01S19/23
Inventor 艾奇武静张召弟陈浩郭旭升
Owner SHANGHAI AEROSPACE CONTROL TECH INST