Study Of Distributed Transient Physical Parameters Filed Information Node Collection Technology

Explosion transient signal is an important parameter in the evaluation of weaponperformance, in current, but storage test equipment of transient signal can commonly usedonly a single test, failing to carrying out multiple times and fast repeatability test. Under thebackground of underwater explosion shock wave testing, basic theory and technology ofdistributed testing system to support, information of distributed transient physical parametersnode collection technology is mainly studied, and a method for obtaining transient signal isproposed in the paper, the method uses a node design technology which combine storage withtelemetry functions, and through multiple nodes form a distributed field information retrievalsystem, which can be used in land-based explosion test and other test field.Firstly, the basic theory of distributed test system is studied in this paper, and focus onthe data communication ways, the node time synchronization technology, test system triggerand data processing programs, based on this, the paper proposed a kind of program oftransient signal acquisition and storage. On this basis, a circuit is designed which mainlyfocuses on the high-frequency portion of transient signal can be quickly collect and storewithin a short time. In order to control signal is sampled and stored, design a negative delaytrigger control mode. The trigger threshold adaptive technology can ensure the stability oftrigger signal. The coding circuit which having the time synchronization function is designed,it is ensure that the subsequent data can be reconstructed and processed. In the design of datawireless transmission, the node circuit and Flash array adopt data interface, which base on SPIbus.The test circuit using FPGA as control unit, by way of hardware programming to achieveeach module coordinating work, A/D converter can in dual channel with a sampling rate of1~8MS/S to complete data collection, the data would be temporarily stored in a ferroelectricmemory, and then in the control of control center，adopting wireless communication make thetarget data transfer to the control center, and choosing specialized software to process data.