A dual-frequency parabolic antenna guided acquisition method

Abstract

The invention discloses a dual-frequency parabolic antenna guidance capture method, which specifically includes the following steps: step 1, control the antenna to point to the target entry point according to the known antenna guidance angle; step 2, control the antenna to a program guidance mode after the task starts, Make the antenna switch to the low-frequency self-tracking mode; step 3, after the antenna enters the low-frequency self-tracking mode, judge the high-frequency signal locking situation and the angle error signal, and when the high-frequency self-tracking mode conditions are met, the antenna switches to the high-frequency self-tracking mode; Otherwise, the antenna is in the low-frequency self-tracking state; step 4, if the receiver loses lock on the high-frequency signal during the tracking process, judge the low-frequency signal locking situation and the angle error signal, and switch the antenna to a different guiding tracking mode according to the judgment result . Adopting the method in the invention can reduce the requirements on satellite orbit prediction accuracy and antenna pointing accuracy, and facilitate the antenna to capture the target.

Description

technical field [0001] The invention belongs to the technical field of spacecraft measurement, control and application, and relates to a dual-frequency parabolic antenna guidance capture method. Background technique [0002] In recent years, with the improvement of satellite communication capacity, there has been a greater demand for satellite-ground communication bandwidth, and the frequency bands of spacecraft measurement, control and communication have gradually expanded from S and C to higher frequency bands such as X and Ka. From the formula θ=70λ / D (where λ is the wavelength and D is the antenna aperture) of the parabolic antenna beam width, it can be seen that the beam width is proportional to the wavelength. When the antenna aperture is constant, the higher the frequency, the smaller the beam. Taking the 15-meter antenna as an example, when it works in the S-band (f=2GHz), the beamwidth is about 0.7°, and when it works in the Ka-band (f=20GHz), the beamwidth is about...

AI Technical Summary

Problems solved by technology

[0003] The antenna is in the stage of capturing the target. When the antenna points to the target position, if the downlink signal can enter the ground station antenna beam range, the target can be captured; when the pointing deviation exceeds the antenna beam width, the downlink signal cannot enter the ground station antenna beam range. within, the capture of the target will fail

Antenna pointing deviation is related to factors such as satellite orbit forecast error, atmospheric refraction, axis error and other factors. The narrow beam capture requires greatly improving the accuracy of antenna axis error, atmospheric refraction error and orbit forecast error, which will cost a lot, and the effect may be did not meet expectations