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Maneuvering target parameter estimating method based on acceleration compensation

A technology for maneuvering targets and parameter estimation, applied in radio wave measurement systems, instruments, etc., can solve problems such as estimation result errors, and achieve the effects of improved parameter estimation accuracy, fast operation speed, and low resolution accuracy

Active Publication Date: 2019-05-10
四川九洲空管科技有限责任公司
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Problems solved by technology

However, for the airborne early warning radar, when using FRFT to estimate the parameters of the maneuvering target with a small number of pulses, the error of the estimation result is relatively large

Method used

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  • Maneuvering target parameter estimating method based on acceleration compensation
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Embodiment Construction

[0019] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0020] One, algorithm principle of the present invention

[0021] Since the linear frequency modulation (LFM) signal has approximately rectangular amplitude-frequency characteristics, and its time-wide bandwidth product B·t 0 The larger the , the closer the amplitude-frequency characteristic is to a rectangle, and the spectral width is approximately equal to the signal bandwidth B. Let the frequency spectrum of LFM signal x(t) be X(ω), according to Parseval energy theorem, the power P of LFM signal x(t) is

[0022]

[0023] When B·t 0 = 1, the formula (1) can be approximated, then the integration interval of the frequency domain energy of the LFM signal x(t) can be rewritten as [0, B], the above formula can be expressed as ...

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Abstract

The invention discloses a maneuvering target parameter estimating method based on acceleration compensation. The maneuvering target parameter estimating method includes the following steps that (1) acceleration compensation is conducted on data, after clutter suppression, received by an airborne early-warning radar; (2) fast Fourier transform is conducted on signals after acceleration compensationto obtain maximum amplitude values corresponding to fast Fourier transform frequency spectrums, and the maximum amplitude values and the Doppler frequencies corresponding to the maximum amplitude values are recorded; and (3) the maximum amplitude values corresponding to the fast Fourier transform frequency spectrums are compared, the maximum value in the maximum amplitude values is selected, theDoppler frequency corresponding to the maximum value is saved, and thus an initial velocity estimated value and an acceleration estimated value of a maneuvering target are obtained. Under the situation of the number of pulses emitted by the airborne early-warning radar in one coherent processing interval (CPI), compared with a fractional Fourier transform (FRFT) method, the parameter estimation accuracy is improved significantly, the operation speed is high, parameter estimation performance is closer to a CRB boundary, and engineering realization is facilitated. Therefore, the problem of low accuracy of an existing in-air maneuvering target parameter estimating algorithm under the short time condition can be solved.

Description

technical field [0001] The invention relates to a method for estimating parameters of a maneuvering target, in particular to a method for estimating parameters of a maneuvering target based on acceleration compensation. Background technique [0002] Under the conditions of modern warfare, threats from the air (such as aircraft and missiles) are undoubtedly the greatest, and the development trend of air targets is that their maneuverability is getting better and better. The detection of air targets and the early detection of incoming air targets play a vital role in fighting for the initiative. High-performance airborne radar has become one of the indispensable technical equipment. However, due to the movement of the airborne platform, the ground clutter spectrum of the airborne early warning array radar shows main clutter broadening and sidelobe clutter diffusion on Doppler, and it is space-time two-dimensional coupling. The key issues in the look-down work of the on-board ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/35G01S7/292
Inventor 郑景忠何川周鑫
Owner 四川九洲空管科技有限责任公司
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