Research on Influence of Optical System Aberrations on Pointing Acquisition and Tracking Technology in Intersatellite Optical Communications
|School||Harbin Institute of Technology|
|Keywords||Satellite optical communications optical aberrations pointing error acquisition error antenna receiver power|
Comparing to microwave communications, inter-satellite optical communications (IOC) have many advantages, such as larger information capacity, smaller antenna, and high security, so they will be an important development direction of inter-satellite communications. Recently, many countries have paid more attention to the development of IOC, such as USA, Europe, Japan and so on. Our country has begun to pay attention to it, and has got some achievement. In the inter-satellite optical communication system, PAT is a key technique related to the establishment and maintenance of the communication links.Optical devices in orbit are affected by their environment, such as space radiation, contamination, and temperature variation, so the optical properties are strongly influenced. In addition, process technic of optical devices, especially of that with larger aperture, is another main factor which affects the optical property. Consequently the laser beam transmitted by antenna is generally the beam with wave-front aberrations. Wave-front aberrations will influence the far-field intensity distribution, and then affect the link and communication properties.To research wave-front aberrations on laser links, pointing and acquisition errors are proposed. Based on Flaunhofer diffraction theory, and using Zernike polynomials to express the wave-front aberrations, the influence of wave-front aberrations on pointing and acquisition errors is studied.To study the influence of wave-front aberrations on antenna receiver power, antenna attenuation factor is proposed. Based on Flaunhofer diffraction theory, and using Zernike polynomials to express the wave-front aberrations, the primary aberrations on antenna receiver power are researched. The numerical will contribute to the design and manufacture of the optical system in inter-satellite communications.