Design And Relization Of Lightning Location System Based On CPLD

Lightning monitor and location technology, which is an important part of lightning proof technology, mainly detect lightning parameters and measure the location of lightning. It is very useful in lightning proof, lightning forecast and lightning early-warning. So it is a new technology that urgent needs to be developed.This paper based on lightning monitor system, studies design and realization of lightning location system based on CPLD. Combine to actual scientific research, the design of the high precise lightning location system base on TOA (Time of Arrival) is introduced.Following, data processing and transfer are particularly studied. This paper raise a new blue print in data processing and realize it, then give some conclusion from elementary experiment. It provides a novel data collecting system which can process the lighting signal in both low and high frequency band. And the data collection system has been realized based on CPLD.This paper introduces the method of clock calibration to VCXO in system,based on GPS and CPLD. It can solve the problem of frequency offset because of Crystal worse behavior in Long-term use.In order to achieve high-precision clock calibration, to use of high-precision synchronization of GPS signals, CPLD computing system clock frequency offset relative GPS signal, send to ARM to drive D/A. This process provides adjust voltage for the voltage-controlled crystal oscillator to achieve regulate the crystal frequency. The algorithm of CPLD chip designed in this paper, using two pulse-counting and CPLD hardware delay means to achieve the balance between CPLD resource consumption and function.