Hypersonic platform-based random frequency hopping radar sub-aperture synthetic imaging method

An imaging method and hypersonic technology, applied in instruments, measuring devices, and re-radiation, etc., to achieve the effect of improving the imaging effect

Pending Publication Date: 2022-01-28
HUNAN UNIV +1
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Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a sub-aperture synthetic imaging method based on hypersonic platform random frequency hopping radar, which solves the above-mentioned problems

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  • Hypersonic platform-based random frequency hopping radar sub-aperture synthetic imaging method

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Embodiment Construction

[0102] 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.

[0103] see Figure 1-9 , the embodiment of the present invention provides the following technical solutions:

[0104] As an optional embodiment, the compensation of the secondary phase term (acceleration):

[0105] If the echo signal of a scatterer appears at the kth sampling point in each pulse period, the initial distance c(n s T+kτ+τ) / 2 as the estimated value of R'; that is

[0106] R(k)=c(n s T+kτ+τ) / 2

[0107] The beam of the tracking radar is very n...

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Abstract

The invention discloses a hypersonic platform-based random frequency hopping radar sub-aperture synthetic imaging method. The method specifically comprises the following steps: 1, providing compensation; 2, performing relation derivation; 3, compensating and correcting; 4, performing imaging processing; and 5, performing full-aperture imaging. The invention relates to the technical field of radar imaging. According to the hypersonic platform-based random frequency hopping radar sub-aperture synthetic imaging method, after coherent accumulation is carried out on images of all sub-apertures, the intensity of the images at the center pixel of each scattering point image is enhanced due to in-phase addition, and the intensity of surrounding pixel points is weakened due to positive and negative offset, that is, relative to the images of all the sub-apertures, the image bright spot of each scatterer in the synthesized image becomes narrower in the speed direction, so that the lateral resolution is improved, the nominal lateral distance resolution of full-aperture coherent accumulation can be achieved, a high-resolution target image is effectively obtained, and the imaging effect is improved.

Description

technical field [0001] The invention relates to the technical field of radar imaging, in particular to a hypersonic platform-based random frequency hopping radar sub-aperture synthetic imaging method. Background technique [0002] In order to improve the target detection, low interception and anti-jamming capabilities of the synthetic broadband imaging guidance radar in super / hypersonic applications, high repetition frequency random frequency hopping synthetic broadband waveforms have been applied. In hypersonic applications, due to the high speed of the radar platform motion, there is serious range-Doppler coupling in the target echo signal. In the case of random frequency hopping, the pulse-to-pulse variation of the radar signal frequency in each synthesized broadband frame is random, the relationship between the range-Doppler coupling phase item and the pulse cycle number is random / non-linear, and the distance- Doppler coupling will lead to severe defocus / blur of the tar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9094
Inventor 张露何松华朱济民欧建平刘盛启
Owner HUNAN UNIV
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