Space-borne liquid crystal optical phased-array antenna beam pointing dynamic switching method

Abstract

The invention discloses a method for dynamically switching beam pointing of a satellite-borne liquid crystal optical phased-array antenna. The method comprises the following specific steps: acquiring a current satellite system beam pointing angle theta 1 and an expected antenna pointing angle theta 2; calculating an absolute value of a difference value between theta 1 and theta 2, comparing the absolute value with a switching threshold value, and if the absolute value is smaller than the threshold value, waiting for a time interval, and re-acquiring a current beam pointing angle theta 1; if the absolute value is larger than the threshold value, calculating the initial phase shift amount and the target phase shift amount of each electrode in the current antenna; adjusting the phase shift amount of the electrode i from the initial phase shift amount to the target phase shift amount, and adding 1 to i; judging whether i is greater than the total number N of the electrodes, and if so, completing beam pointing switching; otherwise, adjusting the phase shift amount of the electrode i from the initial phase shift amount to the target phase shift amount, repeating the previous step until i is larger than the total number N of the electrodes, and completing satellite beam pointing switching. The power is kept stable in the wave position switching process, and wave beam control can be effectively and conveniently achieved; the beam pointing angle is in smooth transition, and far-field light spot blazing can be avoided.

Description

technical field [0001] The invention belongs to the field of satellite mobile communication, and in particular relates to a method for dynamically switching beam direction of a space-borne liquid crystal optical phased array antenna. Background technique [0002] Liquid crystal optical phased array (LCOPA) technology is an advanced beam scanning technology, which has the advantages of low driving voltage, low SWaP, fast response speed, etc. It is widely used in adaptive optics, lidar and space optical communication and other fields. LCOPA achieves high-precision beam deflection and beam pointing through precise modulation of beam phase. Due to the limitation of the liquid crystal processing technology level, the actual deflection efficiency of the liquid crystal optical phased array is far lower than the theoretical level, and the elimination of defects caused by the processing technology can only rely on the improvement of the production technology level. Therefore, improv...

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Problems solved by technology

[0004] Aiming at the problem that the actual deflection efficiency of the existing liquid crystal optical phased array is low, the present invention discloses a method for dynamically switching the beam pointing of the space-borne liquid crystal optical phased array antenna. The specific steps include:

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