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Detection method for distance-extended target

A technology of distance expansion target and detection method, which is applied in the detection field of distance expansion target

Pending Publication Date: 2019-03-26
XIDIAN UNIV
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Problems solved by technology

But for Gaussian white noise, since the covariance matrix has the same structure, the estimated covariance matrix from the auxiliary data degenerates into a covariance estimate

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  • Detection method for distance-extended target
  • Detection method for distance-extended target
  • Detection method for distance-extended target

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Embodiment Construction

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0063] refer to figure 1 , the implementation steps of the technical solution of the present invention are as follows:

[0064] Step 1, the transmission signal of the high-resolution radar is T r (t), the echo signals of two adjacent range units received by the receiver are respectively s 1 (t), s 2 (t), the same reference signal as the transmitted signal is REF(t).

[0065] 1a) The transmitted signal of high-resolution radar is:

[0066] The reference ...

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Abstract

The invention, which belongs to the technical field of signal processing, discloses a detection method for a distance-extended target. The detection method comprises: setting a transmission signal ofa high-resolution radar and respectively determining echo signals, received by the high-resolution radar, of two adjacent distance units; setting a reference signal and removing carrier frequencies inthe echo signals of two adjacent distance units to obtain two mixed output signals; carrying out sampling on the two mixed output signals respectively to obtain two corresponding discrete signals; calculating mutual S expressions and singular values of the two discrete signal; constructing two time-frequency decomposition features according to the singular values and using the two time-frequencydecomposition features as two detection statistic amounts of the target respectively; and determining detection thresholds corresponding to the two detection statistic amounts of the target respectively and thus carrying out target detection according to the two detection statistic amounts and the corresponding detection threshold. Therefore, the target in high-speed motion is detected; and the method has the constant-false-alarm characteristic and can be applied to detection of the distance-extended target immersed in white Gaussian noises.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a detection method of a range-extended target, which can be used for detecting the range-extended target submerged in Gaussian white noise. Background technique [0002] It is well known in the industry that the echo signal of the target is related to the wavelength and distance resolution of the radar transmitted signal. Under high-resolution radar HRR, the projection length of the target on the radar line of sight LOS is longer than the wavelength of the transmitted signal, so the target can be considered to be composed of multiple scattering centers, and its echo is the superposition of the echoes of each scattering center. And because the length of the range resolution unit of the high-resolution radar is smaller than the projection length of the target on the radar LOS, the target is distributed in multiple range units at this time, so it is called a ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/414G01S7/415G01S7/418
Inventor 左磊产秀秀李明孙浩张鹏吴娇娇
Owner XIDIAN UNIV
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