摘要
针对罗兰-C信号幅度、二次相位延迟和形变等重要参数与地面电参数和地形起伏密切相关,设计开发了基于复杂地形下的罗兰-C信号模拟器。通过采用积分方程方法计算出不同频点下的地波衰减因子,与标准信号在频域内相乘,经离散傅里叶逆变换(IDFT)、电文编码和脉冲调制后,生成了包含地面电参数、地形信息和时间信息的实际接收信号。实验以贺县(发射台)至西安(观测点)为例,相对于均匀光滑路径,结果为实际信号的幅度降低了1.47 dB,二次时延增加了0.407μs,信号展宽了约1.5μs。实验结果表明,基于复杂地形的罗兰-C信号模拟器可为罗兰-C接收设备的研制、调试、检测和维修提供更接近实际传输路径的导航信号。
Due to the important parameters of Loran-C signal amplitude,secondary phase delay and deformation are closely related to the ground electrical parameters and terrain fluctuations,the Loran-C signal simulator based on complex terrain is designed.The groundwave attenuation factor at different frequencies is calculated using the integral equation method,which multiplied by the standard signal in the frequency domain,and after IDFT,encoding and modulation,an actual signal containing ground electrical parameters,terrain features,and time information are generated.Taking Hexian County(transmitting station)to Xi’an(observation point)as an example,the actual signal amplitude is reduced by 1.47 dB,the secondary time delay is increased by 0.407μs,and the signal is widened by about 1.5μs relative to the uniform and smooth path.The experimental results show that the Loran-C signal simulator based on complex terrain can provide a navigation signal closer to the actual transmission path for the development,debugging,testing and maintenance of Loran-C receiving equipment.
作者
原艳宁
孙瑾颖
席晓莉
Yuan Yanning;Sun Jinying;Xi Xiaoli(School of Automation and Information Engineering,Xi'an Universily of Technology,Xi'an 710048,China)
出处
《电子测量与仪器学报》
CSCD
北大核心
2020年第12期109-116,共8页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金-面上项目(61771389)资助。
关键词
罗兰-C信号
模拟器
复杂地形
地波衰减因子
Loran-C signal
simulator
complex terrain
groundwave attenuation factor
