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System and method of high-precision distance measurement verification

A technology of verification system and ranging system, applied in the direction of radio wave measurement system, instrument, etc., can solve problems such as difficult to find

Inactive Publication Date: 2013-07-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for most research institutes, it is difficult to find an open space distance of tens or even hundreds of kilometers. If the space distance is required to be accurate to the micron level, it is basically impossible to achieve

Method used

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  • System and method of high-precision distance measurement verification
  • System and method of high-precision distance measurement verification

Examples

Experimental program
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Embodiment 1

[0054] Verify the carrier ranging system by the verification platform of the present invention, such as Figure 4 shown. The carrier ranging system sends the ranging signal to the photoelectric modulator through the carrier transmitter. After the ranging signal passes through the verification platform, the ranging distance is calculated by the distance calculation module of the ranging system.

[0055] Carrier ranging is performed by calculating the phase difference between the locally transmitted carrier and the received carrier, assuming that the initial phase of the locally generated high-frequency carrier signal is Φ 0 , after being transmitted by the verification platform, the phase will have a certain delay. Let the phase of the carrier signal output from the verification platform be Φ 1 (Φ 1 The size of the value changes with the length of the fiber and the distance between the two translation platforms), then during the period when the carrier passes through the veri...

Embodiment 2

[0059] Verify the pseudo-code ranging system by the verification platform of the present invention, such as Figure 6 Shown is the ranging principle of the pseudo-code ranging system and the connection diagram with the ranging verification platform, and its connection mode is similar to that in the carrier ranging system. Different from carrier ranging, the carrier of the pseudo-code ranging system does not carry distance information, but the pseudo-code sequence modulated on the carrier carries distance information. Therefore, a pseudo-code sequence generator is required at the local ranging signal generation end and the pseudo-code sequence needs to be modulated onto a high-frequency carrier and then sent to the back-end link. In addition, the delay extraction of the pseudo-code ranging is different from the carrier ranging. The system adopts the direct correlation method, and the received ranging signal is correlated with the local sub-code respectively. For sub-codes other...

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Abstract

The invention discloses a system and a method of high-precision distance measurement verification. The system of the high-precision distance measurement verification comprises an optical part and a translation platform. The optical part comprises a laser device, an electrooptic modulator, a light-intensity amplifier, an electrooptic demodulator and optical fibers used for connecting all components, and is used for simulating a space long distance. The translation platform comprises a controller, a movable platform, a fixed platform, a screw rod, a transmitting antenna and a receiving antenna, wherein the transmitting antenna and the receiving antenna are respectively arranged on the movable platform and the fixed platform, and the translation platform is used for achieving the adjustment of a space accurate distance. The system and the method of the high-precision distance measurement verification obtains the stability degree of a distance measuring system by adjusting the distance between the movable platform and the fixed platform, and the transmitting distances before and after sampling moving, and calculating the mean square error of sampling data, and obtains the distance measuring precision of the distance measuring system by comparing the average values of the sampling data, and comparing the average values with the actual moving distance of the movable platform. The system and the method of the high-precision distance measurement verification fully utilize the superiority of optical fiber communication, simulate the spatial distance of hundreds of kilometers, shield the interference of external environment, and effectively verify the stability degree and the precision of the distance measuring system.

Description

technical field [0001] The invention relates to the fields of optical fiber communication and inter-satellite ranging, in particular to a high-precision ranging verification system and method. Background technique [0002] At present, in the measurement and control of aircraft, ranging plays an important role, because space applications such as deep space flight, missile tracking, and satellite orbit determination are inseparable from distance measurement. The high-precision inter-satellite ranging system is the key payload for low-satellite tracking gravity satellites. By processing high-precision inter-satellite distance and distance change rate data, the earth's gravity field can be recovered. The precise measurement of the earth's gravitational field is of great significance to the development of geodesy, geophysics, geodynamics and oceanography. In March 2002, the GRACE (Gravity Recovery And Climate Experiment) satellite was successfully launched by Germany and the Uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/497
Inventor 金仲和郭学为王春晖
Owner ZHEJIANG UNIV