Secondary target screening method based on multi-beam forming

A multi-beam and beam technology, applied in the radar field, can solve problems such as high computing power requirements, no target for interference noise, complex inverse calculation, etc., to improve detection performance, easy engineering implementation, and reduce the amount of calculation.

Active Publication Date: 2019-06-28
XIDIAN UNIV
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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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  • Secondary target screening method based on multi-beam forming
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  • Secondary target screening method based on multi-beam forming

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Embodiment Construction

[0040] Embodiment of the present invention and result are described in further detail below in conjunction with accompanying drawing:

[0041] refer to figure 1 , the implementation steps of the present invention are as follows:

[0042] Step 1, get the target unit parameters.

[0043] Get the total number M of target units, and get the distance R of the i-th target unit i and normalized Doppler frequency

[0044] Step 2, judging the positional relationship between the target unit and the sidelobe clutter area.

[0045] 2a) Calculate the maximum normalized Doppler frequency of the sidelobe clutter:

[0046]

[0047] Among them, v=[v x ,v y ,v z ] is the velocity vector of the carrier aircraft, v x , v y , v z Represent the three components of the velocity v on the body coordinate axis; λ 0 is the working wavelength of the radar, fr is the pulse repetition frequency;

[0048] 2b) Determine the normalized Doppler frequency range for the sidelobe clutter region: ...

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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...

Claims

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Application Information

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IPC IPC(8): G01S7/41
Inventor 王彤马南李娜林雪芳
Owner XIDIAN UNIV
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