Double-frequency parabolic antenna guiding and capturing method

Abstract

The invention discloses a double-frequency parabolic antenna guiding and capturing method. The method specifically comprises the following steps: 1, controlling an antenna to point to a target pull-inpoint according to a known antenna guiding angle; 2, controlling the antenna to be in a program guiding mode after the task is started, and enabling the antenna to be in a low-frequency-band self-tracking mode; 3, after the antenna enters the low-frequency-band self-tracking mode, judging a high-frequency-band signal locking condition and an angle error signal, and when a high-frequency self-tracking mode condition is met, switching the antenna to the high-frequency-band self-tracking mode, otherwise, enabling the antenna to be in a low-frequency-band self-tracking state; and 4, in the tracking process, if the receiver loses lock for the high-frequency-band signal, judging the locking condition and the angle error signal of the low-frequency-band signal, and switching the antenna into different guide tracking modes according to different judgment results. By adopting the method provided by the invention, the requirements on the satellite orbit prediction precision and the antenna pointing precision can be reduced, and the target can be conveniently captured by the antenna.

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