The design of virtual spectrum analyzer based on LabVIEW
Abstract:
With the rapid development of micro-electronics, computer, network communication t and software’s technique, the tradition instrument is changed in the computerized direction. Virtual Instrument(VI) concept is produced exactly because of the background like this kind of technology. The virtual instrument is the personal computer instrument which has the virtual instrument front-panel which is constitute by the software, and the sampling signal is gathered under the hardware's support, not only the signal can be proceeded, analyzed and shown in real time, but also the storage consequence can be handled variety under the off-line term. By writing the software and installing the hardware, the virtual instrument can be defined completely by customer for applying different environment and the functions of objects.
In the test field, Spectrum Analyzer is a kind of important instrument in common. But processing craft of this kind of instrument is complicated, producing technique is difficult, the price is expensive. Under the corresponding hardware support the virtual spectrum analyzer can be achieved by using the software.
In this paper the design and implementation of virtual spectrum analyzer are presented. This Virtual Instrument (VI) is designed by using the graphical programming language LabVIEW. It is capable of processing sine wave and square wave. It has many functions including the simulation wave producing, displaying and analyzing in the time and frequency domains. In the time the user-friendly human-machine interface is achieved in this system.
Key words:Virtual instrument, Virtual spectrum analyzer, Graphic programming language, LabVIEW