Research Of A Subminiature Modular Measuremental System Based On Simplified Serial Bus

The conventional missile-borne testing system plays a very important role in cutting testing costs and adapting the intelligent and flexible developments requirements. In this article, a modularization design is presented based on a structure of the specific simplified serials bus, which could be applied in common design of conventional missile-borne testing system with aperture size not less than 76mm.Based on the system, a specific synchronous serial bus communication protocol is designed, and an interface plan is proposed to actualize the bus protocol, meanwhile, the programmable devices for FPGA-based hardware and software designs and implementation are realized. In order to meet the verification requirements of the bus system, four kinds of typical function module units are designed according to the bus interface module. The functional blocks diagram of each functional module units are introduced in detail. The ground configuration management software used in PC is programmed, and hardware and software design of programmable analog conditioning channel based on a programmable system on chip (PSoC) is presented. Besides, a subminiature experimental verification system is setted up which consists of the telemetry module, storage module and three sampling & encoding modules. And the verification experiments are conducted.According to the characteristics of the missile-borne testing system, a general and modular integration means based on specific simplified serial bus is proposed. The key issues of specific streamline serial bus testing systems such as the synchronization, control and error control techniques and so on are discussed in detail. Besides, a specific synchronous serial bus communication protocol based on the practical control method of TDMA is designed, which is significant for achieving the standeration of the missile-borne testing system.Because of the problems of synchronal data acquisition of each modules and plug-and-play exist in the missile-borne testing system, a delay-waited state machine control system to solve the problems of synchronal starting sampling of each module, including that of the reliable separation missile system and ground system on the bus.In designing the sampling & encoding function module units, because classical sampling encoder based on the structure of RAM has much address lines, and can not ultilize the inner hardware FIFO controller of the FPGA, and can not diretedly connect with the bus interface, this paper offers a method of sampling & encoding control based on cyclic FIFO's structure, which simplifies the design and reduces the programmable device performance requirements.When the document management system (FAT32) is applied in the storage testing system, there exists a complicate redundancy and takes up much chip resourses, hence, a simplified method of memory area information management in memory module function units is presented, which realizes data storage management efficiently and briefly.A miniature experimental verification system is set up which consists of the telemetry module, storage module and three sampling & encoding modules.Two experimental verification program is designed and verification experiments are conducted. Test results showed that this bus system worked correctly and eventually realized the modularization design based on bus structure as well as the expected goal was reached finally.