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Extended azimuth phase code based distance fuzzy clutter inhibition method

A technology of distance ambiguity and phase encoding, which is applied in the direction of radio wave measurement system, radio wave reflection/re-radiation, instruments, etc., can solve the problems of limited application, reduction of surveying zone, etc., and achieve effective suppression and solve the problem of clutter suppression , to achieve the effect of limited inhibition

Active Publication Date: 2019-11-05
XIDIAN UNIV
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Problems solved by technology

But the pulse repetition frequency of azimuth-phase encoding is many times larger than the Doppler bandwidth, which leads to a significant swath degradation and limits its application in high-resolution wide-swath SAR / GMTI systems

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  • Extended azimuth phase code based distance fuzzy clutter inhibition method
  • Extended azimuth phase code based distance fuzzy clutter inhibition method
  • Extended azimuth phase code based distance fuzzy clutter inhibition method

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Embodiment Construction

[0030] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] refer to figure 1 , the specific implementation of the range ambiguity clutter suppression method based on the extended azimuth phase coding of the present invention will be further described in detail.

[0032] Step 1, establish the geometric model and slant distance model of the MIMO-SAR system of the moving target.

[0033] refer to figure 2 , set the SAR to work in broadband mode, zero elevation angle, and move along the azimuth direction (X axis) at a constant forward velocity v at a height H above the ground. φ is the depression angle, θ is the cone angle, W g is the entire mapping bandwidth, R u is the maximum unambiguous range. It is assumed that in the MIMO-SAR system, the transmitter has M transmit antennas, and the distance between adjacent transmit antennas is d T Similarly, the receiver has N receiving...

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Abstract

The invention discloses an extended azimuth phase code based distance fuzzy clutter inhibition method. Extended azimuth phase code is used to modulate the phase of the azimuth of an emission signal ofeach transmitting antenna, and spatial frequency spectrums in different distances are separated in the frequency domain of the emission space; an EAPC offset factor is designed, filtering in the transmitting end is carried out, and the target and clutter echo of each distance fuzzy area are extracted independently; energy of a motion target is focused to an expected area by using echoes extractedby orientation de-sloping; and an adaptive matching filtering algorithm is used to inhibit clutters and detect the motion target. Thus, the clutters are inhibited finitely, plotting bandwidth consumption is not generated, and the method can be applied to a high-resolution wide-plotting-band SAR / GMTI system.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a range ambiguity clutter suppression method based on extended azimuth phase encoding, which is used for clutter suppression in a synthetic aperture radar ground moving target detection system and can obtain good range ambiguity clutter Suppression and ground moving object detection effects. Background technique [0002] Ground moving target detection (GMTI) of high-resolution wide swath (HRWS) multi-channel synthetic aperture radar (SAR) can not only provide high-resolution images of stationary scenes in civil fields, including terrain mapping, environmental monitoring and natural disaster damage The assessment can also realize wide-area battlefield surveillance, reconnaissance and intelligence collection for military missions. [0003] For traditional single-channel SAR systems, due to the limitation of the minimum antenna size, it is not easy to so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9029G01S13/9094G01S7/418
Inventor 朱圣棋王博贺雄鹏许京伟曾操王如杰王磊
Owner XIDIAN UNIV
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