Method for detecting low-altitude air vehicle

A method for detecting a low-altitude air vehicle, comprising the following steps:

• S1:
• setting up a fixed column and a movable column, and disposing detection antennas at two ends of each of the fixed column and the movable column, wherein a rotating shaft is disposed on the movable column;
• S2:
• determining whether the two detection antennas on the fixed column simultaneously detect a target;
• and if the two detection antennas on the fixed column simultaneously detect the target, performing step S3;
• or if the two detection antennas on the fixed column do not simultaneously detect the target, performing no operation;
• S3:
• determining in real time whether at least one of the two detection antennas on the fixed column loses the detected target;
• and if the at least one of the two detection antennas on the fixed column loses the detected target, performing step S4;
• otherwise, detecting the target through the two detection antennas on the fixed column;
• and
• S4:
• driving the rotating shaft to make the movable column rotate, such that a displacement of an end portion of the movable column is not less than a half-power beamwidth of the detection antenna;
• and detecting the target through the four detection antennas on the fixed column and the movable column.