Method and device for measuring baseline length of airborne synthetic aperture radar

A technology of synthetic aperture radar and baseline length, which is applied to measurement devices, optical devices, instruments, etc., can solve the problems that the measurement accuracy is greatly affected by the weather environment and the aircraft structure, and can overcome the decline in measurement accuracy and optimize the installation method. , the effect of high measurement accuracy

Pending Publication Date: 2019-02-12
株洲菲斯罗克光电科技股份有限公司
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Problems solved by technology

"This measurement method requires additional additional devices on the aircraft, which has a great impact on the structure of the aircraft, and its measurement accuracy is greatly affected by the weather environment

Method used

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  • Method and device for measuring baseline length of airborne synthetic aperture radar
  • Method and device for measuring baseline length of airborne synthetic aperture radar
  • Method and device for measuring baseline length of airborne synthetic aperture radar

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Embodiment 1

[0043] Such as figure 1As shown, the present embodiment provides an airborne synthetic aperture radar baseline length measuring device, including a measuring optical fiber, a measuring substrate, a fiber grating demodulator, and a host computer; the measuring optical fiber is arranged on the measuring substrate; the measuring substrate is installed on the wing and fixedly connected with the synthetic aperture radar sub-array; the head of the measuring fiber is connected with the fiber grating demodulator, and the tail end of the measuring fiber is respectively connected with an optical isolator. The grating demodulator is connected with the host computer.

[0044] Specifically, a series of fiber gratings are written inside the measuring fiber. Each grating has a different central wavelength, and there is a certain interval between the central wavelengths to ensure that no frequency aliasing occurs during the measurement. In this embodiment, what is written inside the measuri...

Embodiment 2

[0056] The difference between this embodiment and embodiment 1 is that, as Figure 5 to Figure 7 As shown, as a specific implementation of this embodiment, the measurement substrate is a substrate with a continuous cross-section of a rectangular shape with grooves, specifically, a substrate with a concave cross-section. The material of the measurement substrate can be memory alloy. It can be understood that the length of the measurement substrate can be adjusted according to the specific length of the airborne SAR sub-array. The state of installing the fiber Bragg grating on the bottom of the groove of the measurement substrate is as follows Figure 7 As shown, the bottom is the measurement substrate processed by memory alloy, and the measurement optical fiber is accurately installed in the right angle in the groove of the measurement substrate.

[0057] The measurement substrate in this embodiment is not easily twisted and deformed. This embodiment overcomes the result erro...

Embodiment 3

[0059] This embodiment provides a method for measuring the baseline length of an airborne synthetic aperture radar. The measuring optical fiber is installed on the measuring substrate, and the measuring optical fiber is an optical fiber engraved with a fiber Bragg grating; the measuring substrate is arranged on the wing and is connected with the airborne synthetic aperture radar sub-array; by measuring the strain and Curvature, the shape function of the measured substrate is reconstructed to calculate the baseline length between the radar sub-arrays.

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Abstract

The invention relates to the technical field of synthetic aperture radar measurement, and discloses a method and a device for measuring the baseline length of an airborne synthetic aperture radar. Themeasuring method comprises the following steps of: mounting a measuring fiber engraved with fiber Bragg gratings on a measuring substrate, wherein the measuring substrate is disposed on a wing and connected to the airborne synthetic aperture radar sub-array; and reconstructing a shape function of the measurement substrate by the strain and the curvature of the measurement substrate, thereby calculating the baseline length between the radar sub-array. According to the method and the device for measuring the baseline length of the airborne synthetic aperture radar, modeling without wing motioncan be implemented, the accuracy of wing motion modeling cannot affect, and the problem of baseline length measurement of airborne synthetic aperture radar is successfully solved. The measurement accuracy is high, and the method has the advantages of little influence on the wing structure, light weight, and no weather influence.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar measurement, and more specifically, to a method and device for measuring the baseline length of an airborne synthetic aperture radar. Background technique [0002] For airborne SAR aircraft with sub-arrays installed on the wings, the wing deformation during flight will cause the baseline length of the airborne SAR to change. The baseline length is an important parameter in the process of airborne SAR image reconstruction, which is directly related to the quality of the final SAR image reconstruction. [0003] The existing radar baseline length measurement system mainly includes a single POS system + laser / CCD combined sensor baseline measurement system developed by FGSN-FHR Research Institute in Germany. The system's measurement of the baseline length relies on modeling the motion of the wing deformation and is easily affected by the weather environment. [0004] And in the prio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01B11/16G01B11/24
CPCG01B11/02G01B11/18G01B11/24
Inventor 李慧鹏林铁邬战军潘雄邵振华
Owner 株洲菲斯罗克光电科技股份有限公司
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