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Integral aperture phase measurement and compensation method and system

A comprehensive aperture and subsystem technology, applied in the field of phase error measurement and correction, can solve the problems of phase measurement error and comprehensive aperture imaging quality.

Inactive Publication Date: 2008-05-28
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deviation of the position of the aperture array will cause the error of the phase measurement, and the phase error has a great influence on the imaging quality of the synthetic aperture

Method used

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  • Integral aperture phase measurement and compensation method and system
  • Integral aperture phase measurement and compensation method and system
  • Integral aperture phase measurement and compensation method and system

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Embodiment Construction

[0022] Figure 3 shows the structure diagram of a single-channel optical fiber system using a 1×2 optical coupler and optical fiber filter to obtain an optical carrier. The laser 8 uses the redPOWER of SPI Company TM The series of SP-M-10-1550 fiber lasers can work in continuous or pulsed mode at 1550nm. For an N-unit passive synthetic aperture photon imaging system, the output of the laser 8 is distributed to the N-channel optical fiber transmission system through a standard 1×N single-mode fiber coupler 9 . Each path is respectively input into the electro-optic modulator 11 through the polarization maintaining optical fiber 10, and the electro-optic modulator 11 is Covega Inc. Mach-40 TM 027 / 066 M-Z optical waveguide LiNbO3 electro-optic phase modulator. The input 12 of the modulated signal is the field of view radiation received from the antenna. The modulated light wave passes through a phase delay and compensator 13——PZT, and the control signal of the PZT is the phase e...

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Abstract

The invention provides a method and a system for measuring and compensating comprehensive apache photon imaging phases, which comprises using interfering results of electrooptical modulation rear carrier waves to abstract error information of phases, thereby a purpose of measuring and compensating in real time for phase errors of an interfering imaging system can be realized, and the invention belongs to the technical field of interfering-type imaging remote sensing and high spatial resolution military detections. In the invention, the comprehensive apache photon imaging is that after field radiating signals are received and lowered frequency by an antenna array, the field radiating signals are transformed as optical wave signals through an electro-optic modulator and are transmitted to fiber ends to form fiber array imaging. Certain errors can be produced in the process of accepting and transmitting the field signals, while the phase errors have great influence to imaging qualities, thereby the invention provides that a fiber filter is used to separate out fiber medium carrier waves; the phase errors of a path can be abstracted by a plurality of the interfering results, and finally phase delays and compensator are used to correct the phase errors for fibers.

Description

technical field [0001] The present invention mainly relates to the phase error measurement and correction technology of the passive synthetic aperture photon imaging system based on up-conversion electro-optic modulation, especially the use of optical carrier signal for interference, and the calculation of the system phase error by analyzing the interference image, and finally through the real-time phase compensation system to correct errors. Background technique [0002] The passive synthetic aperture photon imaging method is an imaging method based on up-conversion technology. First, the receiving antenna array is optimized according to the carrier, and then the signal received by the receiver is loaded on the light wave through electro-optical modulation technology, transmitted through optical fiber, and formed at the end of the array. The optical fiber array uses micro-optical technology to design the optical system to form an optical synthetic aperture imaging system, a...

Claims

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Application Information

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IPC IPC(8): G01J9/02
Inventor 何云涛江月松黎芳
Owner BEIHANG UNIV
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