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Distributed high-precision laser online measurement system

A measurement system, high-precision technology, applied in the aerospace field, to achieve the effect of simplifying the design difficulty, avoiding cross-interference, and high reliability

Active Publication Date: 2018-08-17
SHANGHAI RADIO EQUIP RES INST
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  • Abstract
  • Description
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Problems solved by technology

For this reason, the present invention provides a distributed high-precision laser online measurement device for deformation measurement of large-scale mechanisms such as satellite SAR antennas, so as to effectively improve the deformation measurement accuracy of antennas

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  • Distributed high-precision laser online measurement system
  • Distributed high-precision laser online measurement system
  • Distributed high-precision laser online measurement system

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Embodiment Construction

[0045] The invention adopts the method of semiconductor laser sine / cosine intensity modulation, optical fiber split beam emission, and optical switch time division control. Through the reflection of the small pyramid reflector at the measurement point, the co-located optical antenna unit receives and transmits the echo, and performs the operation with the reference signal. The difference frequency digital phase discrimination obtains high-resolution distance information, and then calculates the flatness and twist of the antenna from the multi-point distance data to meet the needs of the whole satellite for real-time deformation measurement of antennas and other deployment mechanisms.

[0046] The main and standby laser light source required by the present invention adopts semiconductor laser, and adopts TEC Peltier temperature control system inside to ensure the stability of luminous power, and modulates the current intensity of the laser at 100MHz to generate the emitted laser of ...

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Abstract

The invention provides a distributed high-precision laser online measurement system. A main / backup laser device acts as an emitting light source. Emitting laser is divided into multipath emitting light beams through an optical beam combiner, an optical circulator and an optical beam splitter. The number of split light paths of the emitting light beams is further increased by an optical switch array, and the optical switches can perform time sequence switching on emergent light paths through the control of the system. Each path of emergent laser is corresponding to one optical transmit-receive antenna so as to be corresponding to one cooperative target body. Laser returned by the cooperative target returns to the optical circulator through the light paths and enters a photoelectric detector. Echo phase calculation is performed by a signal processing system after photoelectric conversion of the photoelectric detector so that accurate distance information of a target dot matrix can be obtained. In-orbit real-time deformation measurement is performed on satellite antennas and other large deployable mechanisms, and imaging resolution of the large antennas and the calculated image quality can be enhanced by measurement of the antenna surface.

Description

Technical field [0001] The invention relates to the field of aerospace technology, in particular to a distributed high-precision laser on-line measurement device for deformation measurement of large-scale mechanisms such as satellite SAR antennas. Background technique [0002] In various deployment mechanisms of the satellite, various online measurements are required to obtain its position accuracy and vibration characteristics. The profile measurement of the antenna has a significant impact on the imaging resolution and the image quality calculated. [0003] Spaceborne SAR and other large antenna mechanisms are subject to various loads in space during orbiting. These loads mainly include thermal loads, gravitational gradient moments, atmospheric drag, and satellite motion interference, which will cause the antenna panel to vibrate and reduce the satellite’s Attitude stability and pointing accuracy, and seriously affect the performance of the antenna, resulting in blurred imaging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 杨德钊杨存亮王艳平陶坤宇许明飞
Owner SHANGHAI RADIO EQUIP RES INST
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