Method for estimating tropospheric bias in passive detection system

摘要

Electromagnetic wave propagated via troposcatter is a valuable candidate for beyond line-of-sight detection. To improve the location accuracy of passive detection system based on troposcatter, path delay and angle bias caused by tropospheric refraction effect are estimated through the ray tracing method. As well, the Hopfield model is introduced to overcome ray tracing method's dependence on radiosonde data. Finally, consequences indicate that the Hopfield model can describe the tropospheric refraction better than other models. As well, the ray tracing method improved by the Hopfield model can effectively estimate path delay and angle bias.