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Meng X.W.,Yantai Naval Aeronautical and Astronautical University
Digital Signal Processing: A Review Journal | Year: 2010

The clutter map analyzed by Nitzberg, which averages the detector outputs of the same resolution cell over several past scans to set the detection threshold, plays an important role in radar detection fields. In this work, the average detection threshold (ADT) of Nitzberg's clutter map is derived and its steady-state property is analyzed, moreover, the detection performance of Nitzberg's clutter map for Weibull background is analyzed by the importance sampling technique. © 2009 Elsevier Inc. All rights reserved.


Meng X.W.,Yantai Naval Aeronautical and Astronautical University
IEEE Transactions on Aerospace and Electronic Systems | Year: 2013

The binary integration, also known as S out of M detection, is a popular technique by which the detection statistics of a radar can be greatly improved. In this work, the performance of the ordered-static constant false-alarm rate (OS-CFAR) with binary integration for M sweeps in Weibull background is investigated with an assumption of known shape parameter, not only for homogeneous environment, but also for nonhomogeneous background caused by interfering targets and clutter edges. It's shown that the detection performance of the OS-CFAR with binary integration can not only be greatly improved with respect to the OS-CFAR scheme in a single pulse processing situation, but it can also control the rise of the false alarm rate at clutter edges more effectively. Moreover, an analytic expression for the false alarm rate of the OS-CFAR with binary integration for M sweeps in Weibull background is derived. © 1965-2011 IEEE.


Li T.,Yantai Naval Aeronautical and Astronautical University
Key Engineering Materials | Year: 2011

This paper describes the use of FPGA realization of communication stations, then road transport service data method, if duty rate 32Kb/S, usually on duty voice quality ask for much, as long as can understand. Therefore, if duty rates can be lowered into the appropriate data transmission rate by reducing some of the data, the formation of voice, data combined for the road transport, the rate of post-combiner 32Kb / S, telephone channels in the transmission of duty .this paper designed a total of 5 programs, if the rate of the service16Kb/S, the data rate of 9.6Kb/S, 4.8Kb/S program, done simulation, meet design requirements. © (2011) Trans Tech Publications.


Xu B.,Northwestern Polytechnical University | Shi Z.,Northwestern Polytechnical University | Yang C.,University of Plymouth | Wang S.,Yantai Naval Aeronautical and Astronautical University
Nonlinear Dynamics | Year: 2013

Considering the use of digital computers and samplers in the control circuitry, this paper describes the controller design in discrete time for the longitudinal dynamics of a generic hypersonic flight vehicle (HFV) with Neural Network (NN). Motivated by time-scale decomposition, the states are decomposed into slow dynamics of velocity, altitude and fast dynamics of attitude angles. By command transformation, the reference command for γ-θ p -q subsystem is derived from h-γ subsystem. Furthermore, to simplify the backstepping design, we propose the controller for γ-θ p -q subsystem from prediction function without virtual controller. For the velocity subsystem, the throttle setting constraint is considered and new NN adaption law is designed by auxiliary error dynamics. The uniformly ultimately boundedness (UUB) of the system is proved by Lyapunov stability method. Simulation results show the effectiveness of the proposed algorithm. © 2013 Springer Science+Business Media Dordrecht.


Meng X.W.,Yantai Naval Aeronautical and Astronautical University
IET Radar, Sonar and Navigation | Year: 2010

The performance of the ordered-statistic greatest of (OSGO) constant false alarm rate (CFAR) scheme with binary integration for M non-coherent sweeps in Weibull background was investigated for homogeneous and non-homogeneous backgrounds, with an assumption of known shape parameter. This kind of processing is based on the fact that the clutter can be segmented in regions in many real radar scenarios where a timevarying two-parameter distribution function family can be fitted, but the clutter power may vary locally inside the region. Under the assumption of known shape parameter, the authors examined the changes of the false alarm rate and detection probability of the OSGO-CFAR with binary integration when the shape parameter differs from the nominal one, and compared them to those of the OSGO-CFAR with single pulse processing. The authors have derived analytic expressions of the detection probability and false alarm rate during clutter power transitions for the OSGO-CFAR with binary integration in Weibull background. It is shown that the OSGO-CFAR with binary integration can not only improve the detection performance significantly, but it also control the rise of the false alarm rate at clutter edges more effectively compared to the OSGO-CFAR with single pulse processing. Moreover, it exhibits a good immunity to the variation of the shape parameter. © The Institution of Engineering and Technology 2010.

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