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Space-time two-dimensional keystone transform method of onboard broadband radar

A broadband radar, space-time technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as the decline of clutter suppression effect, and achieve the effect of reducing clutter rank and improving effect performance

Active Publication Date: 2019-12-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] Purpose of the invention: the present invention provides a space-time two-dimensional keystone transformation method for airborne wideband radar, which can overcome the clutter spectrum broadening caused by increasing the transmission bandwidth. The problem that the wave suppression effect decreases

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  • Space-time two-dimensional keystone transform method of onboard broadband radar
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  • Space-time two-dimensional keystone transform method of onboard broadband radar

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] The schematic diagram of the spatial geometric relationship of airborne array radar echo data collection is as follows: figure 2 As shown, the antenna is assumed to be a uniform linear array, including N array elements with an interval of d, and the radar wavelength is set to λ, φ, θ, and α are the azimuth, pitch and yaw angles, respectively. It is assumed that clutter can be divided into independent clutter units, and each clutter ring contains several independent clutter units. Each array element of the radar receives or transmits signals independently and simultaneously, and the received echo of each array element is the superposition of the echoes of all array elements’ transmitted signals. Therefore, assuming that the radar transmission signal is a linear frequency modulation signal, for a single-element radar, after demodulation, the echo signa...

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Abstract

The invention discloses a space-time two-dimensional keystone transform method of a onboard broadband radar. The transform method comprises the steps of transforming three-dimensional radar echo dataafter range pulse compression to a range frequency domain through range Fourier transform; eliminating time domain range migration and space domain aperture transition by adopting keystone transformation of two-dimensional interpolation of azimuth-array elements; transforming back to the range time domain through inverse Fourier transform; selecting a proper sample to perform clutter covariance estimation, wherein the broadband radar echo after the space-time two-dimensional keystone transform conforms to the narrowband hypothesis, and STAP processing is performed by using the covariance obtained through estimation. Through the method disclosed by the invention, the influence of the clutter spectrum two-dimensional broadening can be solved under a condition that the radar broadband is comparatively high, the signal-to-noise-and-noise ratio (SCNR) of a moving target is improved, and the method is a practical onboard broadband radar STAP signal processing technology. The problem that theclutter suppression effect is reduced due to two-dimensional extension of the space-time clutter is solved, and the STAP performance of the broadband radar is improved.

Description

technical field [0001] The invention belongs to airborne radar array signal processing clutter suppression technology, in particular to a space-time two-dimensional keystone transformation method for airborne wideband radar. Background technique [0002] Ground moving target indication (GMTI) has always been a difficult problem for airborne radars. This is due to the broadening of the ground clutter spectrum caused by platform movement when the radar looks down. are submerged in the ground clutter signal. This makes ultra-low sidelobe technology and early single-antenna moving target indication (MTI) radar or pulse Doppler (PD) radar based on time domain processing unable to complete its detection. In addition, all kinds of stealth aircraft and cruise missiles have become real dangers in modern warfare, and further improving the detection performance of stealth and slow-moving targets under the background of airborne radar clutter has become an urgent technical problem to b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 吴迪祝晨曦朱岱寅毛新华李勇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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