Off-axis reflection-type optical antenna design method applied to space laser communication

Abstract

The invention discloses an off-axis reflection-type optical antenna design method applied to space laser communication. The off-axis reflection-type optical antenna design method includes the following steps: determining an optical antenna objective lens initial structure; calculating and selecting an optical antenna overall initial structure; conducting aberration correction; conducting optical antenna error analysis; conducting isolation analysis. According to the off-axis reflection-type optical antenna design method, under the condition that the caliber, the view field and the amplification factor of an optical antenna are guaranteed, the focal distance, the wave aberration, the structural style, the error distribution and the like of the optical antenna are analyzed and calculated. By means of the off-axis reflection-type optical antenna design method, the image quality, the isolation degree and the transmission efficiency of the laser communication optical antenna can be accurately evaluated, and correlation technical indexes of the optical antenna in the laser communication field are improved.

Description

technical field [0001] The invention relates to an off-axis reflective optical antenna design method applied to space laser communication, which can quantitatively determine the off-axis reflective optical antenna, and belongs to the technical field of laser communication. Background technique [0002] Laser communication is an important technical approach for high-speed data transmission, and the rate of single-load data transmission ranges from several Gbps to 30Gbps. The remote sensing data transmission rate of the high-resolution earth observation system has high requirements and a wide range of rates, and the data transmission equipment will also be mounted on various satellite platforms, run in different orbits, and be used in inter-satellite and satellite-ground links. The satellite-borne data transmission equipment of the high-resolution system needs to choose a modulation and demodulation method that matches the ultra-high-speed transmission, and has the characteris...

AI Technical Summary

Problems solved by technology

The disadvantage is that the field of view is small, the backscattering is large, and the transmission efficiency is low

The transmit-receive isolation of the Cassegrain optical antenna is about 50dB, and at the same time, it has a central shield. Since the emitted beam is a Gaussian beam, a large part of the energy in the center cannot be used. The center of the card-type optical antenna is shielded by 20%, and the beam distribution is Gaussian beam. Calculated, the loss of emission efficiency is about 1.5dB, and the energy loss is about 30%, so there is an urgent need for an optical antenna that can achieve high image quality, high isolation and high transmission efficiency.

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