一種無線數(shù)據(jù)采集和傳輸系統(tǒng)的設(shè)計-外文翻譯-其他專業(yè)-閱讀頁
2025-02-08 00:29本頁面
【正文】 F [3] and Infrared [4]. Compared with longdistance wireless munication work, they are different in the basic structure, the application level, service range, and business (data, voice). The originalintention of design of shortrange wireless munication work is to provide shortdistance broadband wireless access to 6 mobile environment or formulation of temporary work, it is the further development of inter in mobile environment. The main advantage of shortrange wireless munication work is lower cost and more flexible use. This paper presents the design proposal of hardware and software of information terminal (a machine) and wireless receiver module of multipoint shortrange wireless data collection and transmission work, which provides a lowpowered and highperformance wireless data munication system, works in the ISM （ Industrial Scientific Medical） Band. The remainder of this paper is anized as follows. In Section Ⅱ , we describe the general block diagram of the wireless data acquisition and transmission system. In section Ⅲ , we analyze the key technologies about the system hardware design. In section Ⅳ , the system software design is introduced. In section Ⅴ , the testing results of system is presented. Finally, we present the conclusion and future work in Section Ⅵ . II. SYSTEM IMPLEMENTATION MODEL A. System Model As a point to multipoints multimission wireless munication system, it consists of one central monitoring system (CMS) and Multiple Remote Terminal Units (RTU) (figure 1). In fact, this remote terminal unit is some kind of removable stations which can municate with other stations in the process of motion. Furthermore, the CMS municate with RTU in bidirectional way. In the next part, some pivotal segment on software and hardware of the information terminal and control center was designed. B. Reference Model The system in this paper is designed based on the first layer (the physical layer) and the second layer (the data link layer) of the architecture of OSI/RM (Open Systems Interconnection Reference Model) that the ISO (International Organization for Standardization) proposed, such as figure 2. The function of the physical layer is finished through constructing the circuit and special chips. Otherwise, munication protocols in the data link layer are realized by software. Ⅲ .THE HARDWARE DESIGN OF THE SYSTEM For the sake of the convenience of design, maintenance and update, some hardware circuit cell and node was divided into some different module according to functional and electric characteristic. There are RF Transceiver module [5], controlling and dealing module, Universal Serial interface module, data buffer and storage module and multifunctional power management module in the basic structure (Figure 2). In the process of sending, the data package should been Modulated with High frequency and sent to object RF 7 Transmitting module, in the process of receiving, the high frequency signal have been demodulated to original data package through the RF receiver module. NRF905 [5] is the key of RF Transceiver module whose frequency is 16MHz Crystal Oscillator. NRF905 can receive the RF signal by Printed Antenna, but this module adopts the external antenna and Filter Circuits in order to improve the receiver sensitivity and antijamming ability. B. Controlling and Treating modue The controlling and treating module consists of MCU and external circuit, it have two functions: one made all module’s working under control and har
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