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A Parameter Estimation Method of Maneuvering Target 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, achieve the effects of improved parameter estimation accuracy, low resolution accuracy, and fast operation speed

Active Publication Date: 2021-07-16
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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  • A Parameter Estimation Method of Maneuvering Target 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 method for estimating parameters of a maneuvering target based on acceleration compensation, which comprises the following steps: 1) performing acceleration compensation on the clutter-suppressed data received by an airborne early warning radar; 2) performing fast Fusion on the acceleration-compensated signal Get the maximum amplitude value corresponding to the fast Fourier transform spectrum, and write down the maximum amplitude value and its corresponding Doppler frequency; 3) Compare the maximum amplitude value corresponding to the fast Fourier transform spectrum, and select the maximum value , and save its corresponding Doppler frequency, and then obtain the estimated initial velocity and acceleration of the maneuvering target. In the case of the number of pulses transmitted within one CPI of the airborne early warning radar, the present invention has significantly improved parameter estimation accuracy compared with the FRFT method, and the calculation speed is faster, and the parameter estimation performance is closer to the CRB boundary, which is beneficial to engineering realization. Therefore, the present invention can solve the problem of low accuracy under short-term conditions in existing air maneuvering target parameter estimation algorithms.

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 ...

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Application Information

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Patent Type & Authority Patents(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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