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Small-size UAV (unmanned aerial vehicle) target radar detection method based on long-time phase-coherent accumulation

A small unmanned aerial vehicle, coherent accumulation technology, applied to radio wave measurement systems, instruments, etc., can solve the problem of lack of small unmanned aerial vehicle detection in low-altitude airspace

Active Publication Date: 2018-07-31
成都电科智达科技有限公司
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Problems solved by technology

[0010] What the present invention aims to solve is to provide a radar detection method for small UAV targets based on long-term coherent accumulation to solve the problem of lack of detection systems for small UAVs in the existing low-altitude airspace.

Method used

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  • Small-size UAV (unmanned aerial vehicle) target radar detection method based on long-time phase-coherent accumulation
  • Small-size UAV (unmanned aerial vehicle) target radar detection method based on long-time phase-coherent accumulation
  • Small-size UAV (unmanned aerial vehicle) target radar detection method based on long-time phase-coherent accumulation

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0050] The signal that radar transmits among the present invention is chirp signal:

[0051]

[0052] Among them, rect(·) is a rectangular window function, T r is the pulse width, γ is the frequency modulation slope, f 0 is the carrier frequency, is the total time, is the time horizon (fast time), t m =mT, m=0, 1, 2, ... means the slow time, T is the pulse repetition time.

[0053] Using a piecewise function to model the movement process of the UAV target, the instantaneous slant distance within the observation time can be described as:

[0054]

[0055]

[0056] Among them, r 0 is the initial slant distance between the target and the radar, v i , i=0,1,...M is the radial velocity of the i+1th movement of the target, T i , i=0,1,...M is the end time of the i+1th movement of the target, and the total number of segments of the target's segmented...

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Abstract

The invention belongs to the technical field of radar target detection, and specifically relates to a method for detecting small-size maneuvering target, moving in a segmented manner, based on long-time phase-coherent accumulation. According to the technical scheme of the invention, the modeling of the slope distance between a radar and a moving target is mainly carried out through a segmentationequation. Afterwards, a proposed phase-coherent accumulation method based on RFT is employed, and the searching of parameters is performed, thereby achieving the long-time phase-coherent accumulationof a target echo signal, and improving the detection probability of a target. The beneficial effects of the invention are that the method can achieve the quick recognition of a small target which moves in a segmented manner.

Description

technical field [0001] The invention belongs to the technical field of radar target detection, and in particular relates to a small unmanned aerial vehicle target radar detection method based on long-term coherent accumulation. Background technique [0002] With the maturity of drone technology and the sharp drop in the price of related products, various types of drones have been used in different fields. However, while drones bring convenience to people, they have also become criminal tools in the hands of criminals. Due to the lack of regulatory control measures for drones, the phenomenon of drone abuse and illegal flying is becoming more and more serious. Faced with the threat of such targets, higher requirements are put forward for the detection capability of radar. [0003] Today, multi-rotor small drones are not only easy to control, can take off and land vertically, and can easily hover in the air after takeoff, but also have the advantage of high serviceability, th...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/411G01S7/415
Inventor 曹宗杰
Owner 成都电科智达科技有限公司
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