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Hovering helicopter detection method under low-repetition frequency and short-stay conditions

A detection method and low repetition frequency technology, applied in the field of radar, can solve the problems of inapplicability, inability to accumulate and improve the signal-to-noise ratio, and achieve the effect of improving the signal-to-noise ratio

Active Publication Date: 2019-06-21
CNGC INST NO 206 OF CHINA ARMS IND GRP
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Problems solved by technology

In addition, the peak packet only periodically appears in a certain pulse echo in the time domain, and cannot be effectively accumulated to improve the signal-to-noise ratio
Therefore, the traditional hovering helicopter detection method is not suitable for machine-scanning ground intelligence radar with low repetition frequency and short dwell parameters

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  • Hovering helicopter detection method under low-repetition frequency and short-stay conditions
  • Hovering helicopter detection method under low-repetition frequency and short-stay conditions
  • Hovering helicopter detection method under low-repetition frequency and short-stay conditions

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Embodiment Construction

[0028] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0029] refer to figure 1 , the implementation steps of the present invention are as follows:

[0030] Step 1: Echo Preprocessing

[0031] 1a) performing pulse compression processing on each beam echo;

[0032] 1b) Perform MTI processing on the post-pulse echo,

[0033] x MTI =X PC (1:M-1,:)-X PC (2:M,:),

[0034] where X MTI ∈ C (M-1)×L and x PC ∈ C M×L Represent the echo after MTI and the echo after pulse pressure, M and L respectively represent the number of pulses and the number of distance units.

[0035] 1c) Perform MTD processing on the post-MTI echo to realize coherent accumulation,

[0036] x MTD (:,l)=FFT{X MTI (:,l)*w,N fft}l=1,2,...,L,

[0037] in Indicates the echo after MTD, w∈C (M-1)×1 Represents the Hamming window function, the symbol FFT{} represents the fast Fourier transform operation, N fft Indicates the number of points of ...

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Abstract

The invention relates to a hovering helicopter detection method under low-repetition frequency and short-stay conditions. According to the hovering helicopter detection technology under the low-repetition frequency and short-stay conditions, a rotor signal-to-noise ratio is improved by echo preprocessing, the rotor echo is reliably detected through a low threshold CFAR and binary accumulation, anda hovering helicopter is thus detected through Hough transform and peak detection along a Doppler dimension line. The hovering helicopter detection method under low-repetition frequency and short-stay conditions is characterized in that hovering helicopter detection has no requirements about radar pulse repetition frequency and stay time.

Description

technical field [0001] The invention belongs to the field of radar technology, and relates to a new detection technology for hovering helicopters under low repetition frequency and short dwell conditions. The technology is used for ground intelligence radar to effectively detect hovering helicopters under low repetition frequency and short dwell conditions. Background technique [0002] Armed helicopters can fly at low altitude and slow speed or hover, use terrain for cover, hover close to the combat zone and then suddenly jump to attack or hover for combat. Therefore, the hovering helicopter detection technology is of great significance in the military. For traditional machine-scanned ground intelligence radars, considering the unambiguous detection range and data rate requirements, the radar pulse repetition frequency is usually low and the beam dwell time is short. When the helicopter hovers, its echoes are submerged by clutter, and it becomes a difficult problem for gro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88
Inventor 王勇付学斌陈尹翔王育东田欢
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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