近距离高速无线数据传输系统研究
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摘要
4当前冲击波测试的常用方法为引线电测法和存储测试法,它们都是基于有线连接的数据传输方式,在使用时存在弊端。引线电测法中,长电线会成为整个测试系统中的薄弱环节;存储测试法则无法实时监测系统状态,数据读取不方便。爆炸结束后,必须正确回收测试装置,并插上专用的读数电缆才能读取测试数据。随着近距离无线通信技术的迅速发展,将无线传输技术应用于冲击波测试已成为趋势。本文将传统的存储测试技术与新兴的无线通信技术相结合,设计了应用于冲击波测试的无线数据传输系统,力图以现场设备的无线化来解决有线电缆带来的诸多问题。
     论文根据冲击波测试的设计要求,选择微功率无线通信技术为冲击波测试无线连接方式的解决方案。为满足测试数据高速传输的需要,本文选取nRF24L01为系统的高速无线收发芯片、USB为与计算机通信的接口、PIC单片机为中央控制单元,进而确定了系统的总体设计方案。整个无线传输系统由从控系统和主控系统两部分组成,其中从控系统与存储测试系统连接,主控系统与计算机连接,根据两者的结构特点,分别进行了射频电路设计、控制电路设计、接口电路设计以及供电电路设计。同时,为满足冲击波测试对通信距离的要求,又设计了功放电路。系统无线传输功能的实现离不开软件系统,本文分别对从控系统和主控系统进行了控制程序设计,设计了测试系统连接、上电、参数设定、测压自检、测速自检、调平衡、读取测试数据等子程序,并提出了两种对测试数据处理的方案。
     论文最后将设计的无线传输系统与存储测试系统联调,进行了控制指令以及测试数据的无线传输实验,同时还对系统的平均传输率和传输距离进行了测试。测试结果表明:设计的近距离无线数据传输系统能够应用在小当量的冲击波测试中,可实现200米范围内测试数据的可靠无线传输,传输率为450Kbps。
Recently, the usual methods of measuring shock wave are down-lead electronic measurement and storage measurement, which are based on lineate data transmission manner and have several disadvantages in application area. For the first method, the long line may become the weakness tache in the system; while the second method can’t real-time monitor the state of system running and can’t read the measuring data expediently. We must not recycle the measuring equipment rightly and insert the special reading cable to read the measuring data until the explode finishes. With the development of short distance wireless communication technique, applying the wireless transmission technique to the shockwave measurement domain already becomes a trend. This paper combines the conventional storage measurement technique with the rising wireless communication technique, designing the wireless data transmission system which applies in the shock wave measurement to solve several problems that lineate cable brings in by locate equipment’s wireless manner.
     According to the design request of shock wave measurement, this paper selects micro-power wireless communication technique as the solving scheme for the shock wave measurement. In order to satisfy the need of high speed data transmission , this paper selects nRF24L01 as the system’s high speed wireless RF chip、selects USB as the communication interface with the computer and selects PIC single chip as the MCU, with these the total design scheme has been finished. The total wireless transmission system is composed of slave-control system which connects the storage measurement system and master-control system that connects the computer. According to their structural character, RF circuit、control circuit、interface circuit and power circuit have been designed respectively. Aiming at extending the communication distance, power amply circuit is also designed. As the realization of wireless transmission function can’t leave software system, this paper respectively designs the control programs for the slave-control system and master-control system, some sub-programs such as connecting the measurement system、power on、parameter initializing、pressure measurement with own checking、speed measurement with own checking、debug balance and reading the measuring data have also been designed, and besides proposing two schemes for dealing with the measuring data.
     At the end of this paper, the wireless transmission system with the storage measurement system have been debugged together to do some experiments for the wireless transmission of control command and the measuring data, besides the average transmission speed and transmission distance for this system have also been measured. The result of measuring realizes that the designed wireless data transmission system can apply in the small quantity shock wave measurement, and can effectively realize wireless data transmission at the speed of 450Kps within 200 meters.
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