介绍了一种基于ARM的水文测量报警系统的设计.该系统以LPC2148微处理器为控制核心,基于超声波测距原理测量系统距水面的距离；使用变频雷达传感器测量水面流速.在软件设计中使用滤波法、中值法提高超声波测距精度；编程设计控制雷达波发射频率精确的测量水面流速.系统使用LCD显示测量结果、报警值和报警状态；使用RS-232串口和嵌入式无线数据传输模块通信和数据传输；通过按键扫描调整水面距报警值,实现了系统液面距的声光报警.%This paper introduced the design of a kind of hydrological measuring and alarming system based on ARM.The system took LPC2148 microprocessor as the control core.The distance from system to water surface was measured based on ultrasonic ranging principle.Water surface velocity was measured by the use of frequency modulated continuous wave radar sensor.In software design filtering and median method was used to improve the value of ultrasonic ranging accuracy.The transmit frequency of sensor wave was controled by programing design to measure the water surface velocity accurately.LCD was used to display measured results、alarming value and alarm status,RS-232 serial port and SZ05-SDT embedded wireless data transmission modules were used to communicate and data transmission.The system adjusts the alarm value of the distance to water surface through the key scan presupposition,system acousto-optic alarm of distance to water surface is realized.
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