Double-frequency parabolic antenna guiding and capturing method

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 mod