Mechanism Analysis of GPS-IR Technology Based on SNR |
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| Authors: | Xiaorong Sun Shubi Zhang Jizhong Wu Nanshan Zheng |
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| Institution: | 1. NASG Key Laboratory of Land Environment and Disaster Monitoring, China University of Mining and Technology, Jiangsu Xuzhou 221116, China;2. School of Civil Engineering and Architecture, Suqian College, Jiangsu Suqian 223800, China;3. School of Geomatics Science and Technology, Nanjing Tech University, Nanjing 211800, China |
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| Abstract: | The available research on technology mechanism of reflected wave reception, the use of the SNR observations of low elevating angle and the form of SNR residuals for GPS-IR is not clear enough, and they are almost interpreted by experiments. This paper analyzed the GPS-IR technology mechanism from the aspects of theories and experiments. The right hand circular polarized wave transmitted by GPS satellite is partly converted into left hand circular polarized wave after one reflection, and the conversion ratio increases with the increase of satellite elevating angle and dielectric constant. When the right hand circular polarized wave is perpendicular to the surface of the perfect conductor, it can be all converted into left hand circular polarized wave after a reflection; At the same time, in the case of the measuring GPS receiver equipped with the baffle plate, because of the diffraction phenomenon, the antenna of the measuring GPS receiver can still receive the right hand circular polarized wave in the reflected signal. When the elevating angle is smaller or the dielectric constant of the reflector is larger, the less GPS incident wave energy of vertically polarized wave and parallel polarized wave is transmitted to the reflector. The more intense the reflected wave is, the worse the SNR is affected by the reflected wave, and there are more right hand circular polarized waves that can be received. Therefore, the GPS-IR uses the SNR observations of low elevating angle (such as under 30°). When the elevating angle changes and the range is smaller, the SNR residuals sequence is approximately "cosine curve", and thus, an inversion model based on SNR residuals is established. |
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| Keywords: | SNR GPS-IR technology Mechanism analysis Polarization characteristic Inversion model |
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