罗兰C信号传播中的ASF修正方法  

ASF Correction in Loran-C Signal Transmission

作　　者：高锐[1] 

机构地区：[1]中国电子科技集团公司第二十研究所,陕西西安710068

出　　处：《现代电子技术》2006年第13期10-11,共2页Modern Electronics Technique

摘　　要：罗兰C信号在传播过程中受到陆地导电率和地形等因素的影响,传播速度不可预测,使信号传播时延增加,引起附加二次相位因子(ASF),降低了接收机的定位精度,因此在精确定位解算之前,需要用ASF对实测的罗兰传播时延进行修正。介绍了采取时间比对方法,利用现场实测和理论预测相结合建立起ASF修正数据库,提供给用户使用,解决ASF修正问题,使定位准确度得到有效改善。Loran- C signal is affected by land conductivity and landform,it passes through in the course of transmission, the speed of transmission is unpredictable,increase time delay,produced ASF,thus making the location of receiver less accurate. So before compute the position, we need correct time delay of Loran transmission by ASF. The paper expatiates method of time contrast,builds ASF data- base by practical measure and academic measure, supplies need of user. The accuracy will greatly be improved and solve the ASF when using the methed.

关 键 词：罗兰C ASF修正 TOA 等效导电率 

分 类 号：TN911.7[电子电信—通信与信息系统] P228.4[电子电信—信息与通信工程]