Researched And Implemented On Various Trigger Capture And Digital Phosphor Display Functions Of Real-time Spectrum Analysis System

In recent years, communications technology changed with each passing day, coding and modulation techniques applied for wireless communications continue to improve, resulting in many new ways to optimize bandwidth utilization and improve communication quality. The higher communication quality of human put forwards new and greater challenges to testing field. In the consideration of improving spectrum capacity and performance of communication, advanced RF(radio frequency) technology, such as adaptive modulation,signal burst and frequency-hopping have been used in communications, these technologies not only make the signal burst and transient but also bring about the characteristic of modulation and frequency changing over time. Therefore, we need to adopt new testing ways and more powerful signal monitoring tools to help find, identify and capture varieties burst-transient signals and those small signals hidden beneath large signals.Based on the development of spectrum analysis technique both at home and abroad, this paper proposed a real-time spectrum analysis system with the functions of digital phosphor display and various trigger capture, and focusing on the research and analysis of overlap frame technology, trigger and capture technology, digital phosphor display technology in spectrum analysis. By overlap frame sliding stepper, effectively solved the effect of window in spectral analysis, avoiding signal loss; Frequency mask trigger technology can trigger and capture various abnormal signals by using two-dimensional trigger mode and storage control scheme; Digital phosphor display technique integrates fast Fourier transform, data compression and color level matching, distinguish the signal changing ditails of some time vividly and intuitively.Meanwhile, in this part, we comparatively analyze two ideas to acquire bitmap data, greatly lighten the pressure of data processing for system’s modules. Besides, this paper also intuitively put forward and implemented logarithmic operation on FPGA(Field Programmable Gate Array)for the data with random decimal point positions. Combined with engineering practice, optimized and analyzed each module’s implementation in FPGA and FPGA chip timing,resources and power by the implementation of real-time trigger module and digital phosphor display module.Finally, according to complete testing idea and hardware and software platform, the entire system and every module are tested and identified,geting the corresponding test results.The design and implementation of spectrum analysis, various trigger functions and digital phosphor display functions in this paper meet the design requirements; The paper not only gives the software simulation results but also finally obtain the practical application results by engineering tests. According to the software simulations and final engineering tests, the system is reliable and with high performance, fully verified the feasibility of algorithm proposed by this paper, which can be applied to a variety of measuring instruments.