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Distance-Doppler matching method for measuring radar cross section of moving target

A radar cross-sectional area and matching method technology, which is applied in the field of distance and Doppler matching of moving target radar cross-sectional area measurement, can solve problems such as large energy fluctuations and affecting the accuracy of RCS measurement

Active Publication Date: 2017-05-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The traditional moving target detection adopts the pulse compression method in the range domain and the Doppler filter bank in the Doppler domain, but the energy fluctuation of this method is large, which seriously affects the accuracy of RCS measurement

Method used

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  • Distance-Doppler matching method for measuring radar cross section of moving target
  • Distance-Doppler matching method for measuring radar cross section of moving target
  • Distance-Doppler matching method for measuring radar cross section of moving target

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Embodiment

[0077] Arrange the external field environment, set the carrier frequency f c =35GHz, then the operating wavelength of the radar λ=c / f c =8.57mm, where c=3×10 8 m / s is the speed of light, and V=20m / s is the speed of the moving target. Assuming that the diameter of the target to be measured is D=5m, substitute λ and D into the formula r≥2D 2 / λ can get the distance r≥5834m that satisfies the radar far-field working conditions. In this example, the distance of the moving target to be measured is around 7500m, and the moving target to be measured is moving away from the radar within the range of the radar beam, such as figure 1 As shown, the RCS measurement includes the following steps:

[0078] 1) Pulse repetition period T r =0.25ms, pulse width T p =5μs, signal bandwidth B=2×10 7 Hz, modulation frequency K=B / T p =4×10 12 , the T r , T p , K, f c Bring into the formulas (1), (2), (3) to get the expression of the chirp s(t), and the radar radiates the signal through the...

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Abstract

The invention belongs to the technical field of wireless electricity measurement and particularly relates to a distance-Doppler matching method for measuring a radar cross section of a moving target. The invention discloses a high-precision distance-Doppler matching method for measuring the radar cross section (RCS) of the moving target. By utilizing a matching filter with time shifting and a frequency domain subdivision method, the high-precision distance-Doppler matching is realized, and therefore, a high-precision RCS measurement value is obtained. The method has the advantages that compared with a traditional pulse compression method, by utilizing the matching filter with the time shifting, the fluctuation of energy in a distance domain is obviously reduced; compared with a traditional Doppler filter set, by utilizing the frequency domain subdivision method, the fluctuation of energy in a Doppler domain is obviously reduced; and compared with traditional schemes, by utilizing a signal processing method, errors of matching between the distance domain and the Doppler domain are reduced, and therefore, the high-precision RCS measurement value is obtained.

Description

technical field [0001] The invention belongs to the technical field of radio measurement field, and in particular relates to a distance and Doppler matching method for measuring the radar cross-sectional area of ​​a moving target. Background technique [0002] Radar cross-section (RCS) is a measure of the ability of a target to scatter electromagnetic waves in a given direction under plane wave illumination. The larger the RCS value, the easier it is for the target to be detected. Therefore, RCS measurement is of great significance in radar detection, stealth and anti-stealth, aerospace and other fields. High-precision RCS measurement has also become the focus of researchers. [0003] There are two measurement methods of RCS: The first one is theoretical calculation method, according to the electromagnetic theory, several typical scattering mechanisms can be analyzed. However, for targets with complex structures and various materials, it is very difficult to use theoretic...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4008
Inventor 宗竹林杨梦君周龙杰高洁舒兆伟张顺生
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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