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Non-cooperative target ranging system and method combining frequency sweeping and heterodyne interferometer

A technology of heterodyne interferometer and non-cooperative target, which is applied in the direction of radio wave measurement system, instrument, measurement device, etc., and can solve the problem of low measurement accuracy

Pending Publication Date: 2021-11-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of low measurement accuracy in the ranging system of non-cooperative targets in the prior art. The present invention provides a non-cooperative target ranging system and method combined with frequency sweep and heterodyne interferometer

Method used

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  • Non-cooperative target ranging system and method combining frequency sweeping and heterodyne interferometer
  • Non-cooperative target ranging system and method combining frequency sweeping and heterodyne interferometer
  • Non-cooperative target ranging system and method combining frequency sweeping and heterodyne interferometer

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specific Embodiment approach 1

[0094] Specific implementation mode one: the following combination figure 1 Describe this embodiment. The non-cooperative target ranging system combined with frequency sweep and heterodyne interferometer described in this embodiment includes an external cavity laser 1, a single-frequency laser 2, a first auxiliary interferometer 3, a second auxiliary interferometer Instrument 4, Measuring Interferometer 5, No. 1 Beam Splitter 6, No. 2 Beam Splitter 7, No. 3 Beam Splitter 8, No. 4 Beam Splitter 9, No. 5 Beam Splitter 10, Acousto-Optic Modulator AOM11, Data collectors and processors;

[0095] The first auxiliary interferometer 3 and the measuring interferometer 5 form a frequency-sweeping interferometer;

[0096] The second auxiliary interferometer 4 and the measuring interferometer 5 constitute a heterodyne interferometer;

[0097] The laser output from the external cavity laser 1 is split by the No. 1 beam splitter 6 to generate two laser beams, one of which is sent to the f...

specific Embodiment approach 2

[0121] Specific implementation mode two: the following combination figure 1 The present embodiment is described, and the ranging method realized by the non-cooperative target ranging system combined with frequency sweep and heterodyne interferometer described in the first embodiment is adopted, and the method includes the following steps:

[0122] S1, the processor receives the difference frequency signal I a (k) After the distance signal carrying the vibration information, first filter the distance signal carrying the vibration information to obtain the frequency-sweeping interference signal I 1 (k) and heterodyne interference signal I 2 (k);

[0123] S2, using the difference frequency signal I a (k) The heterodyne interference signal I 2 (k) demodulate to obtain I I (k) and I Q (k), and then use the least squares method to I I (k) and I Q (k) Carry out circle fitting, thereby obtain the value of α and β;

[0124] in,

[0125] I I (k) is the heterodyne interference...

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Abstract

The invention discloses a non-cooperative target ranging system and method combining frequency sweeping and a heterodyne interferometer, relates to the field of non-cooperative target ranging, and solves the problem that in the prior art, the ranging system for the non-cooperative target is low in measurement precision. The heterodyne interferometer and the sweep-frequency interferometer adopt a common-path structure, the vibration and the distance of a target can be measured synchronously, the vibration measurement result is used for correcting vibration caused by the Doppler effect in a sweep-frequency interference signal I1 (k), and the influence of the vibration on a distance measurement result is corrected. The system and the method are mainly used for measuring the distance of the non-cooperative target.

Description

technical field [0001] The invention relates to the field of distance measurement of non-cooperative targets. Background technique [0002] The ability to perform high-accuracy absolute distance measurements is becoming increasingly important in industrial environments (aerospace industry or other heavy manufacturing) where large components are being assembled or machines are operating. Due to the development of frequency-sweeping lasers, frequency-sweeping interferometry (FSI), as a technique with high precision and no ranging blind zone, has attracted more and more attention in absolute distance measurement. [0003] For basic FSI, where the optical path difference (OPD) change of the interferometer is measured, the measurement error is hundreds of times larger than the actual OPD change. This is caused by the Doppler effect introduced by the vibration, that is, the ranging accuracy is low due to the vibration. [0004] To overcome this problem, in 2001, Schneider et al....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48G01S7/481G01S7/495G01S7/497G01S17/08
CPCG01S7/4802G01S7/4818G01S7/495G01S7/497G01S17/08Y02A90/10
Inventor 路程许梓艺刘国栋刘炳国
Owner HARBIN INST OF TECH