CAJ | 학술논문

土壤水分含量不仅对农作物生长有较大的影响,而且对越野车辆地面通过性也有重要的影响.设计了一种基于时域反射法的土壤含水量测试系统.通过直接数字频率合成器(DDS)产生电磁波测试其介电常数;然后利用介电常数-含水量经验模型得出土壤含水量.系统还配备了GPS接收系统,能记录每次测量的经纬度坐标,并且根据经纬度地名对照表在记录中存储相应的地名.系统通过扩展存储容量使测试记录数可达上万条,并且能通过串口把数据上传到计算机中进行进一步处理.该测试系统具有便携、快速、原位测量的特点,便于构建时空尺度的土壤含水量演变立体分布图,为车辆地面通过性判断提高依据.
토양수분함량불부대농작물생장유교대적영향,이차대월야차량지면통과성야유중요적영향.설계료일충기우시역반사법적토양함수량측시계통.통과직접수자빈솔합성기(DDS)산생전자파측시기개전상수;연후이용개전상수-함수량경험모형득출토양함수량.계통환배비료GPS접수계통,능기록매차측량적경위도좌표,병차근거경위도지명대조표재기록중존저상응적지명.계통통과확전존저용량사측시기록수가체상만조,병차능통과천구파수거상전도계산궤중진행진일보처리.해측시계통구유편휴、쾌속、원위측량적특점,편우구건시공척도적토양함수량연변입체분포도,위차량지면통과성판단제고의거.
The soil water content has a great influence not only to the growth of crops, but also to the off-road vehicle' s ground trafficability. A soil water content detector system based on time domain reflectometry is designed. It tests soil' s dielectric constant by the DDS producing electromagnetic waves, then uses dielectric constant - water content empirical model to educe the soil water content. The system also provides the GPS receiving system. It can record the latitude and longitude to coordinate each time, and to save the corresponding geographic name in the record according to the latitude and longitude geographic name comparative table. The system makes the record number reach ten thousand through extending the storage capability, and can upload the data to the computer through the serial port for a further processing. The test system has portable, rapid, insitu measurement characteristics, and is easy to construct the space-time-scale three-dimensional distribution of the soil water content evolution. It can help judge vehicle' s ground trafficability.