Design And Development Of Spectrum Monitor Device Application Software Based On Embedded Linux System

As a device which is based on spectrum analysis,combines spectrum analysis and spectrum direction finding, can be used in different kinds of field such as radar set,radio monitoring and spectrum analysis etc. As control center, lots of function are achieved by application software, so the quality of application software affect the using effect.The main content of this paper is to develop embedded Linux system application software according to the function of this device.The requirement demonstration of the whole system is done. By using QT + QWT as software development tools, the development cycle is greatly shortened. According to the function,software is divided into six modules, each module runs as a separate thread, which ensures the stability and speed of the software.According to the function of device, six parts are introduced in the paper:spectrum analysis,spectrum direction finding,spectrum monitoring,data communication,FFT, GPS and serial port keyboard.HPI interface is used to achieve data communication and command send.For the large number of command,index table is designed to achieve the command download. When designing the module of spectrum analysis,the waveform response is promoted by using the Qt double caching technology and QWT.Lots of methods are used to optimize the code to improve the readability in the UI part.Following function is achieved:waveform refresh,wave data processor,Marker, spectrum amplication and spectrogram etc.Based on the spectrum analysis, GIS and GPS, the function of spectrum direction finding and spectrum monitoring is achieved. By using Mapinfo map and transplanting MAPX into Qt, the target location is achieved in the map.In view of low demand,software provide FFT interface to achieve FFT algorithm in ARM to replace DSP,which can greatly reduce the cost of the equipment.In order to guarantee the accuracy of the system time,GPS time is used to calibrate system time.After testing many times,the software runs steadily,meets requirements,it can be referred in later period.