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Airborne double-antenna double-measuring device interference SAR base linc motion measuring method

A measurement device and motion measurement technology, used in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc. problem, to achieve the effect of high short-term accuracy, light weight, and improved motion measurement accuracy

Inactive Publication Date: 2007-11-07
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

Since the calculation process will inevitably introduce random vibration errors, no matter how the accuracy of the baseline near-end antenna motion measurement device is improved (and the cost will increase), the error caused by random vibration will seriously affect the baseline remote antenna motion measurement accuracy, resulting in inaccurate measurement Baseline length d and baseline inclination angle α, which seriously affect the accuracy of interferometric SAR height measurement

Method used

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  • Airborne double-antenna double-measuring device interference SAR base linc motion measuring method
  • Airborne double-antenna double-measuring device interference SAR base linc motion measuring method
  • Airborne double-antenna double-measuring device interference SAR base linc motion measuring method

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Embodiment Construction

[0032]System hardware configuration requirements:

[0033] 1. One of the two airborne interferometric SAR antennas is located on the side of the fuselage, and the other is far away from the fuselage. The baseline formed by the two is perpendicular to the flight direction of the carrier aircraft. See Figure 1. The baseline near-end antenna can send and receive SAR signals; the baseline far-end antenna only receives the SAR echo signal sent by the baseline near-end antenna.

[0034] 2. Install motion measurement devices at positions close to the phase centers of the two antennas. The baseline near-end antenna movement measurement device is an optical fiber or flexible inertial navigation + GPS integrated navigation system, and the baseline far-end antenna movement measurement device is silicon MEMS inertial navigation.

[0035] The specific implementation of the system is:

[0036] The inertial navigation + GPS integrated navigation system for baseline near-end antenna motion ...

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Abstract

The invention discloses a measuring method used piggyback twin antenna double measuring devices to interfere SAR base line motion. It includes the following steps: using twin antenna interference phase to gain carried machine roll angle; increasing observed quantity for base line near end antenna motion measurement integrated navigation system by co-ordinate transformation to restrain attitude measurement error diversity for routine inertial navigation and GPS integrated navigation system to increase base line near end antenna motion measurement precision; using the base line as strengthener to realize rough transfer alignment; using silicon MEMS inertial navigation output data and local relative navigation technique to correct the rough transfer alignment result to increase base line far end antenna motion measurement precision.

Description

technical field [0001] The invention relates to an airborne double-antenna double-measuring device interference SAR (Synthetic Aperture Radar, synthetic aperture radar) baseline motion measurement method, which is particularly suitable for the measurement method of the baseline motion accurate measurement under the high-frequency vibration environment of the interference SAR carrier aircraft platform. Background technique [0002] SAR high-resolution remote sensing imaging has the advantages of all-weather imaging, penetrating imaging, and stereoscopic imaging. Military and civilian dual-use high-tech equipment for earth observation. Interferometric SAR is the product of the combination of phase interferometry technology and synthetic aperture radar technology, and is mainly used to obtain terrain relative height information. Interferometric SAR has the characteristics of high measurement accuracy, large coverage and high work efficiency. [0003] The principle of interfer...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 盛蔚房建成曹娟娟孙宏伟韩晓英
Owner BEIHANG UNIV
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