Airforce Radar Academy

Hugang, China

Airforce Radar Academy

Hugang, China
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Peng S.,Airforce Radar Academy | Peng S.,Tsinghua University | Xu J.,Tsinghua University | Xia B.,Tsinghua University | And 2 more authors.
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2011

In this paper, a method of joint estimation of imaging time and rotation velocity is proposed for inverse synthetic aperture radar (ISAR) maneuvering targets, and the closed expression form of rotation velocity with phase slope difference (PSD) is derived in detail. First, the target rotation phase is retrieved based on two prominent scatterers, and the suitable imaging times are selected as the intervals with high phase linearity degree (PLD). Second, the rotation phase during the suitable imaging time is divided into two half segments, and the PSD between the two half segments is estimated by their difference. Accordingly, the rotation velocity can be obtained based on the PSD, and the range-Doppler(RD) image cross range scaling can be realized by using the estimated rotation velocity. Finally, the effectiveness of the proposed method is verified by using simulated as well as real data.

Peng S.-B.,Airforce Radar Academy | Peng S.-B.,Tsinghua University | Xu J.,Tsinghua University | Peng Y.-N.,Tsinghua University | And 2 more authors.
IET Radar, Sonar and Navigation | Year: 2011

In order to rescale an inverse synthetic aperture radar image into a homogeneous range cross-range domain, a novel method is proposed to estimate rotation velocity (RV) by exploiting the phase slope difference of two prominent scatterers on a complex image. Firstly, two prominent scatterers are automatically extracted in a range-Doppler image via watershed method. Subsequently, the signal obtained by the two scatterers is divided into two equal segments, each of which provides an estimation of the phase slope via phase unwrapping and the least-square fitting. Finally, the target RV can be estimated based on the difference of the two phase slopes. The proposed method can be implemented automatically and is more computationally efficient than the traditional methods. Finally, the results based on simulation data and real data are provided to demonstrate the effectiveness of the proposed method. © The Institution of Engineering and Technology 2011.

Peng S.-B.,Airforce Radar Academy | Xu J.,Tsinghua University | Xiang J.-B.,Airforce Radar Academy | Peng Y.-N.,Tsinghua University
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | Year: 2010

In order to select a suitable time interval to reconstruct a well-focused ISAR image for maneuvering target in long recorded data, a novel method based on Phase Linear Degree (PLD) is proposed in this paper. Firstly, the scatterer phase property is deduced in detail and the imaging time condition is given. Secondly, two prominent range cells are selected based on the Average Range Profile (ARP), and the radial phase is removed by the two range cells conjugate multiplication. Then the rotation phase is curve fitting based on the unwrapping phase. Accordingly, the phase linear degree of the rotation phase is evaluated at the different time interval, and the interval with the highest phase linear degree is selected as the imaging time. Finally, the technique effectiveness is tested by simulated and real data.

Tang L.,Beijing Institute of Technology | Hao Q.,Beijing Institute of Technology | Zhu Q.-D.,Beijing Institute of Technology | Wang J.-H.,Beijing Institute of Technology | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

The proposed wavefront testing method in time- and spatial-domain takes advantage of both active and passive phaseshifting. It obtains stable wavefront with random noises removed after processing of large amount of serially collected interforograms. Since the environmental vibration and air turbulence are adopted as the passive phase-shifting source, this method performs well in normal laboratory environment without special vibration isolation or air flow control. This method has application prospect in large-aperture optical surface test because it can help simplify the system and reduce the cost and difficulty in fabrication. In order to quantitatively evaluate the anti-vibration capability of this method, the influence of vibration on the measurement accuracy is simulated and analyzed. It is confirmed that corresponding to certain accuracy tolerance, the product of maximum tolerant vibration amplitude and frequency is invariable. This very product is adopted as the threshold indicating anti-vibration capability. More conclusions can be drawn after analysis about the influence of active phase-shifting velocity, sampling frame frequency and relative sampling frame number on the measurement accuracy: when the relative sampling frame number is fixed, the anti-vibration capability of the method is increased with active phase-sifting velocity. © 2010 Copyright SPIE - The International Society for Optical Engineering.

Tang L.,Beijing Institute of Technology | Yu C.,Beijing Institute of Technology | Zhang C.,Beijing Institute of Technology | Zhang C.,Airforce Radar Academy | Wang Y.,Beijing Institute of Technology
Advanced Materials Research | Year: 2011

This paper presents a self motion and rotation video nodes coverage algorithm. Through software simulation and calculation, building hardware experiment platform, the block field and the overlapped field avoid experiments, It shows that the algorithm can makes the node identify and avoid the block field itself, avoid block and towards the angle of rotation, and reduce the neighbor node area of the overlapped field, and obtain better coverage rate and monitoring results. It enhanced the underlying control techniques for the wireless sensor networks and self-organizing ability, so as to make the wireless sensor network more suitable for the battlefield environment. © 2011 Trans Tech Publications.

Wang Y.,Beijing Institute of Technology | Yu C.,Beijing Institute of Technology | Zhang C.,Beijing Institute of Technology | Zhang C.,Airforce Radar Academy | And 2 more authors.
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

In this paper, we use Taylor model to analyse a twowire transmission line radiated by plane wave. We give a complete solution to the load voltages in response to an electromagnetic interference on two parallel transmission lines, and get the incident direction and polarized direction in which the electromagnetic wave don't cause the interference voltage and current on the load of the two parallel transmission lines. © 2011 IEEE.

Wang Y.,Beijing Institute of Technology | Yu C.,Beijing Institute of Technology | Zhang C.,Beijing Institute of Technology | Zhang C.,Airforce Radar Academy
Proceedings - International Conference on Electrical and Control Engineering, ICECE 2010 | Year: 2010

An electromagnetic topology method used to analyze interactions between electronic systems and electromagnetic environment is presented. Combining electromagnetic topology model with the graph theory, an efficient algorithm is obtained. The algorithm can find out all the paths which have a lower shielding coefficient than the given threshold K in the shielding electromagnetic topological diagram. © 2010 IEEE.

Fu Y.,Airforce Radar Academy | Tang Z.,Airforce Radar Academy | Sun Y.,Airforce Radar Academy | Sun Y.,Beijing Institute of Radio Measurement and Metrology | Zhan L.,Airforce Radar Academy
Proceedings of 2011 IEEE CIE International Conference on Radar, RADAR 2011 | Year: 2011

Based on deliberate analysis of the detection problem concerning the target buried in blind Doppler zone of AEW radar, a target detection system is conceived founding on multi-AEW radar data fusion. The fusion rule as well as the generalized likelihood ratio and the false alarm threshold of local radar sensors are derived. Simulation results demonstrate that the advanced technique can improve the probability of target detection and the quality of target track dramatically in case the necessary condition is satisfied. © 2011 IEEE.

Liu L.,National University of Defense Technology | Zhang G.,Airforce Radar Academy | Mo J.,National University of Defense Technology | Yuan N.,National University of Defense Technology
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2012

Graphical electromagnetic computing(GRECO)is one of the most promising methods to simulate the electrically large object scattering. But traditional GRECO algorithm can not directly calculate the bistatic RCS and multiple reflections. Moreover, the calculation accuracy is limited by the screen resolution. This paper presents a new method to reconstruct the geometric information from the information of pixels, by which the bistatic RCS and multiple reflections can be easily calculated accompanied with SBR. Meanwhile, by using the off-screen frame buffer object(FBO)method, GRECO's shortcoming of its calculation accuracy being dependent on the screen resolution is overcome.

Chen C.,Airforce Radar Academy | He M.,Airforce Radar Academy | Shen Z.,Airforce Radar Academy | Wang Z.,Airforce Radar Academy
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2011

LMS adaptive filter is a widely used algorithm for DSP, and there are lots of methods to put it into practice. This paper studies the characteristics of LMS adaptive filter first, then, proposes the program which uses embedded way of soft processing in FPGA. This paper analyses the advantages and disadvantages of the method, and in-depth looks the wired word length effect in hardware realization.

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