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An electromagnetism scattering characteristics of Stealth target is a base for bistatic radar design. To study anti— stealth technology of bistatic radar, the radar cross section(RCS) of F-22 are calculated and measured by a true contrail. The simulation conclusion is accordant with the theory. Some valuable data can be provided as the theoretical bases for the design of anti-stealth radar systems.
The high-accuracy retrieval of sea remote sensing information, such as wind field, wave height and Permittivity, is determined by the microwave scattering model at the sea surface. Thus it is meaningful to study the accurate microwave scattering characteristic of rough sea surface. Based on the current Two-Scale model, this paper modifies the model of microwave scattering from three aspects:the correction...
The high-accuracy retrieval of sea remote sensing information, such as wind field, wave height and Permittivity, is determined by the microwave scattering model at the sea surface. Thus it is meaningful to study the accurate microwave scattering characteristic of rough sea surface. Based on the current Two-Scale model, this paper modifies the model of microwave scattering from three aspects:the correction...
Aiming at the limitation of the TRMM Radar, we study on the next generation precipitation radar - GPM DPR radar, which not only works in the Ku-band, but also the Ka-band, for the global precipitation measurement. In this paper, the scattering characteristic of precipitation particles in the Ku-band and Ka-band has been analyzed in theory. Firstly, the model of precipitation is set up. Secondly, scattering...
The signal sparse representation is one of the key elements of CS theory. This article covers construction of sparse basis matrix according to the form of radar signal,the sparse transform for radar echo signal, imagination according to the algorithm of CS reconstruction, showing the effectiveness of the compressed sensing imaging method by simulation results.
The high-power microwave (HPM) test platforms using pulse compression method are investigated for anti-jamming application of radar in this paper. The X-band and S-band test platforms have been designed, and the main parameters are: output 5–7MW with pulse width 10ns for X-band, output 50MW–150MW with pulsed width 10ns, 100ns respectively for S-band. The platforms have played a key role to produce...
More and more attentions are being paid on space detection in terahertz range. The information of deep space and the Earth can be extracted from the observatory datum in terahertz range. The rapidly increasing space debris is heavily threatening the safety of the space vehicles. The small, high speed kinetic kill vehicles with super manoeuvrability also threatening. Ballistic missile warheads had...
The high-accuracy retrieval of sea remote sensing information, such as wind field, wave height and Permittivity, is determined by the microwave scattering model at the sea surface. Thus it is meaningful to study the accurate microwave scattering characteristic of rough sea surface. Based on the current Two-Scale model, this paper modifies the model of microwave scattering from three aspects: the correction...
This paper proposes a novel reconstruction algorithm developing from the earlier work by Stuff. The proposed algorithm acquires better computational efficiency and reconstruction accuracy by reducing the redundant parameters describing the geometry invariants. The 3D Euclidean distances between points are used to evaluate the accuracy performance of the proposed algorithm. The experiment results show...
At present, most of 3D reconstruction algorithms only use the range history of scatters for ISAR frame. The reconstruction algorithm that utilizes both range and cross range data is proposed to replace of the method using only the range, which improves the reconstruction accuracy and decreases the least image quantity for the successful reconstruction. The 3D Euclidean distances between points are...
The cross-range resolution of a traditional radar depends on its antenna beam width and The distance between radar and target. The resolution of non-synthetic aperture radar is usually low due to the limited antenna aperture. This paper presents cross-range super-resolution algorithm based on principle components linear prediction in the sub bands, in order to improve the angle resolution of the short-distance...
A modeling and calculation method for the RCS of complicated satellite targets is given in this paper, and the method is applied in the calculation of cube and cylinder with perfect conductor characteristic. Finally, the paper gives the instance of calculation to satellite target's RCS, and contrasts the result between satellite with metal and satellite with multi-layer material. We get the conclusion...
High resolution spaceborne SAR to obtain a wide range of application in recent years, but the real-time imaging algorithm encountered a huge computation challenge. CS(compressed sensing) theory is a novel data collection and coding theory under the condition that signal is sparse or compressible. This paper discusses the CS technology will be introduced to the spaceborne radar imaging algorithm, so...
The 180° hybrid is a fundamental component in microwave circuit. It's inherently a narrow-band structure. This paper presents the design and performance of a broadband microstrip 180° hybrid operating from 3 to 5 GHz. The hybrid is composed of a power divider and a marchand balun. By designing a new three coupled lines marchand balun structure instead of conventional narrowband balun, the hybrid achieves...
The design and implementation of a three-dimensional (3D) location system to provide accurate location information is proposed in this paper. The location information is computed by two techniques. Both Trilateration technique and the Time Difference of Arrival (TDOA) are applied to three sets of collected distance measurements and to obtain accurate distance measurements between the Transmission...
The standing-wave dipole and the traveling-wave monopole in time domain are proposed to model information technology equipment. The standing-wave dipole model can be easily got from some other references and the traveling-wave monopole model is built based on Rothwell's work with some revision made. The condition, on which selection can be made, is included. Features of the transient near zone and...
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