Secondary target screening method based on multi-beam forming

Abstract

The invention discloses a secondary target screening method based on multi-beam forming, thereby solving problems of large computational load and low detection efficiency in the prior art. The methodcomprises steps: step one, determining a target unit of a clutter sidelobe region; step two, calculating a ground clutter azimuth with the same Doppler frequency as the target unit; step three, determining an azimuth range of the multiple beams and calculating weight vectors of the multiple beams; step four, comparing a difference between an average output power of the multiple beams and an outputpower of the main beam with a secondary detection threshold and determining whether alarming is false alarming; and step five, traversing all target units and storing real target units to complete secondary detection. According to the invention, a plurality of beams are formed in a specific angle range; and whether the alarming is false alarming is determined based on the difference between the output powers of the main beam and the multiple beams, so that the false alarming number is reduced effectively, the detection performance of the moving target is improved, and the computing load is reduced. Therefore, the method can be applied to detection of ground moving targets by the airborne early warning radar in a non-uniform environment.

Description

technical field [0001] The invention belongs to the technical field of radar, and specifically relates to a target secondary screening method, which can be used to reduce the number of false alarms in CFAR technical detection methods. Background technique [0002] The main task of airborne early warning radar is to detect and track moving targets such as aircraft, missiles, and ships. When the moving target is detected in the airborne pulse Doppler radar, due to the movement of the radar, the static object on the ground produces a radial velocity relative to the radar, resulting in Doppler spread of the ground echo. The energy of the main beam of the radar antenna is very strong, and the energy of the ground echo in its irradiation area is also very strong. The area occupied by the distance Doppler plane is called the main lobe clutter area. The area occupied by the ground echo generated by the antenna sidelobe beam is called the side lobe clutter area, and the power in the...

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Problems solved by technology

[0005] 2) Adjacent cells only contain interference noise and no target

However, in the whitening process of ACE, the inversion of the interference-plus-noise autocorrelation matrix is ​​involved. Usually, the space-time dimension of the matrix ranges from hundreds to thousands. high

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