中国物理B ›› 2012, Vol. 21 ›› Issue (10): 109202-109202.doi: 10.1088/1674-1056/21/10/109202
• GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS • 上一篇 下一篇
张金鹏a, 吴振森a, 赵振维b, 张玉生b, 王波c
Zhang Jin-Peng (张金鹏)a, Wu Zhen-Sen (吴振森)a, Zhao Zhen-Wei (赵振维)b, Zhang Yu-Sheng (张玉生)b, Wang Bo (王波)c
摘要: The maritime tropospheric duct is a low-altitude anomalous refractivity structure over the ocean surface, and it can significantly affect the performance of many shore-based/shipboard radar and communication systems. We propose the idea that maritime tropospheric ducts can be retrieved from ocean forward-scattered low-elevation global positioning system (GPS) signals. Retrieval is accomplished by matching the measured power patterns of the signals to those predicted by the forward propagation model as a function of the modified refractivity profile. On the basis of a parabolic equation method and bistatic radar equation, we develop such a forward model for computing the trapped propagation characteristics of an ocean forward-scattered GPS signal within a tropospheric duct. A new GPS scattering initial field is defined for this model to start the propagation modeling. A preliminary test on the performance of this model is conducted using measured data obtained from a 2009-experiment in the South China Sea. Results demonstrate that this model can predict GPS propagation characteristics within maritime tropospheric ducts and serve as a forward model for duct inversion.
中图分类号: (Ocean/atmosphere interactions, air/sea constituent fluxes)