Avionics Technology 

Abstract: The developments in recent years of the theory and applications on week signal detection technology are described in detail in this paper,including the background,classification,new methods,and application examples.

Abstract: In this paper,the Algorithm of tight coupling of the integrated navigation system is studied;and the precision in different coupling mode for GPS/INS integrated navigation system is also analyzed by simulationwhen the performance of INS become degraded.It turns out that GPS/INS integrated navigation system based on tight coupling can get higher precision than that by GPS/INS integrated navigation system based on loose coupling.The conclusion is proven correct via simulation.

Abstract: Based on the working principle of HD CCD imaging sensor and AD9847 video processing chip,HD video signal processing circuit is designed.With FPGA(Field-Programmable Gate Array)chosen as the hardware design platform,initialization set and driving schedule generator of AD9847 are described by using VHDL.The function simulation of the system is successfully fulfilled with ISE10.1 software and the simulation results show that the developed HD CCD video signal processing circuit can not only meet the requirements of HD CCD imaging system, but also have reliable performance and functional agility.

Abstract: In the field of image processing,it is very difficult and significant to make right evaluation for image quality.This paper introduces objective measurement techniques for image quality evaluation according to three kinds of FR(Full-Reference),RR(Reduced-Reference)and NR(No-Reference).Firstly it introduces the development of image quality assessment in our country and abroad,then it introduces different ways of evaluation and different models,and choose proper representative algorithm for illustration.Finally,this paper gives the development direction and techniques of image quality evaluation.