FDR土壤墒情传感器的研究与实现
发布时间：2018-09-05 15:46
【摘要】：丰富而准确的土壤墒情信息对研究水循环变化规律、水资源合理利用、农林牧业精准灌溉和抗旱救灾等工作发挥重要作用。而现今我国土壤墒情检测主要依靠经验估计,墒情信息获取难度大且准确性差。随着数据通信技术的发展,将无线通信技术、计算机网络及土壤检测技术结合起来实现对土壤墒情的准确智能检测是大势所趋。本文对比了国内外土壤墒情检测方法的优劣,选定频域反射法(FDR)为土壤墒情检测实现方法,以S3C2440A为嵌入式处理器,Linux为嵌入式操作系统提出了土壤墒情传感器的设计方案。该传感器由模拟信号输入模块、信号处理模块、显示模块、存储模块、通信模块和供电单元组成,模拟信号输入模块实现墒情信息与电信号的转换,由LC谐振电路、128分频电路、波形转换电路、滤波电路和信号放大电路组成。在嵌入式Linux平台上,完成u-boot的修改,kernel的定制和root的构建,并将其移植到传感器上。基于Linux软件开发环境实现传感器驱动和测试功能。对FDR土壤墒情传感器进行实地测试,测试结果表明,该传感器能够准确测量、显示土壤墒情,并且将其通过3G模块,以PDU格式发送至终端设备,具有高精度、高灵敏性、高实时性和操作便捷等特点。
[Abstract]:Rich and accurate soil moisture information plays an important role in the study of water cycle, rational utilization of water resources, precision irrigation of agriculture, forestry and animal husbandry, drought resistance and disaster relief. Nowadays, the soil moisture detection in China mainly depends on the experience estimation, the soil moisture information acquisition is difficult and the accuracy is poor. With the development of data communication technology, it is a general trend to combine wireless communication technology, computer network and soil detection technology to realize accurate and intelligent detection of soil moisture. In this paper, the advantages and disadvantages of soil moisture detection methods at home and abroad are compared. The frequency domain reflection method (FDR) is selected as the realization method of soil moisture detection, and the design scheme of soil moisture sensor is put forward with S3C2440A as embedded processor and embedded operating system. The sensor is composed of analog signal input module, signal processing module, display module, storage module, communication module and power supply unit. The analog signal input module realizes the conversion of moisture information and electrical signal. Waveform conversion circuit, filter circuit and signal amplifier circuit. On the embedded Linux platform, the customization of the u-boot kernel and the construction of the root are completed and transplanted to the sensor. The sensor driving and testing functions are realized based on Linux software development environment. The field test of FDR soil moisture sensor shows that the sensor can accurately measure and display soil moisture, and send it to terminal equipment in PDU format through 3G module, which has high precision and high sensitivity. High real-time and convenient operation and other characteristics.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152.7;TP212
本文编号：2224726
[Abstract]:Rich and accurate soil moisture information plays an important role in the study of water cycle, rational utilization of water resources, precision irrigation of agriculture, forestry and animal husbandry, drought resistance and disaster relief. Nowadays, the soil moisture detection in China mainly depends on the experience estimation, the soil moisture information acquisition is difficult and the accuracy is poor. With the development of data communication technology, it is a general trend to combine wireless communication technology, computer network and soil detection technology to realize accurate and intelligent detection of soil moisture. In this paper, the advantages and disadvantages of soil moisture detection methods at home and abroad are compared. The frequency domain reflection method (FDR) is selected as the realization method of soil moisture detection, and the design scheme of soil moisture sensor is put forward with S3C2440A as embedded processor and embedded operating system. The sensor is composed of analog signal input module, signal processing module, display module, storage module, communication module and power supply unit. The analog signal input module realizes the conversion of moisture information and electrical signal. Waveform conversion circuit, filter circuit and signal amplifier circuit. On the embedded Linux platform, the customization of the u-boot kernel and the construction of the root are completed and transplanted to the sensor. The sensor driving and testing functions are realized based on Linux software development environment. The field test of FDR soil moisture sensor shows that the sensor can accurately measure and display soil moisture, and send it to terminal equipment in PDU format through 3G module, which has high precision and high sensitivity. High real-time and convenient operation and other characteristics.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S152.7;TP212
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