Cheng-Yung Huang

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GPS radio occultation (RO) signals are highly coherent and precise, and thus sufficient for holographic investigation of the atmosphere, iono-sphere, and the Earth's surface from space. In principle, three-dimensional radio-holographic remote sensing is possible by using new radio holo-graphic equations to retrieve the radio field within the atmosphere from(More)
—Radio-occultation (RO) technique, which has been used in planetary science, is a method to obtain the profiles of atmosphere and the global atmospheric data. In 2006, Taiwan launched six low-Earth-orbit satellites as a RO constellation mission , known as FORMOSAT-3. In order to thoroughly understand the process of the RO data retrieval and obtain as much(More)
A three-dimensional ray tracing model with aiming algorithms for global positioning system (GPS) signal is proposed to make simulations conform to the realistic radio occultation (RO) signal propagation. The two aiming algorithms used in this study ensure the initial and end point ray trajectories are located in the prescribed region. In past studies, the(More)
We propose a new configuration for using a triangle-wave signal to drive the electro-optic modulator in an electro-optic heterodyne interferometer system. The new configuration is adapted to measure the phase retardation of a wave plate and the optical rotation angle of a chiral medium. By adding optic elements, the second-harmonic component amplitude of(More)
Fine structures in the vertical gradient of the electron density have been retrieved by means of analysis of the amplitude of radio occultation (RO) data in sporadic E-layers (heights interval 85-110 km). Maximum values of the positive gradients 45⋅10 9 , 48⋅10 9 , 25⋅10 9 , 29⋅10 9 [m −3 km −1 ] are located at levels 92, 105 km (GPS/MET event 0393) and(More)
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