Propagation modeling of ocean-scattered low-elevation GPS signals for maritime tropospheric duct inversion
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
a School of Science, Xidian University, Xi'an 710071, China; b China Research Institute of Radio Wave Propagation, Qingdao 266107, China; c Institute of Oceanographic Instrumentation, Qingdao 266001, China
Abstract 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.
Zhang Jin-Peng (张金鹏), Wu Zhen-Sen (吴振森), Zhao Zhen-Wei (赵振维), Zhang Yu-Sheng (张玉生), Wang Bo (王波) Propagation modeling of ocean-scattered low-elevation GPS signals for maritime tropospheric duct inversion 2012 Chin. Phys. B 21 109202
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