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| Optimization of a 50 MHz Frequency Modulated Continuous Wave radar system for the study of auroral E-region coherent backscatter | |
| Perry;Gareth William | |
| 出版年 | 2010 |
| 学位授予单位 | University of Saskatchewan |
| 英文摘要 | A 50 MHz Frequency Modulated Continuous Wave (FMCW) radar system, developed at the University of Saskatchewan to provide improved spatial and temporal resolution measurements of auroral E-region plasma processes, introduces ambiguous spectral information, due to spectral ghosting, for scattering events in which multiple radar echoes are detected. This thesis identifies two Linearly Frequency Modulated (LFM) radar waveforms used by the FMCW system as the source of the ghosting. An analysis procedure designed to counteract the spectral ghosting problem is developed but is not an ideal solution, and therefore replacement of the LFM waveforms is recommended. A detailed investigation of alternative radar waveforms using the Ambiguity Function and Ambiguity Diagram techniques is performed. A frequency coded continuous wave radar waveform based on a composite Costas sequence is proposed as a successor to the LFM waveforms. The composite Costas radar waveform will conserve the spatial and temporal resolutions extended by the LFM waveforms and preclude any spectral ghosting. Implementing the proposed radar waveform and avoiding receiver saturation issues with the mono-static FMCW radar system in which both the transmitting and receiving antenna arrays are simultaneously and continuously active and geographically co-located is also discussed. In addition to this, two 50 MHz backscatter events are presented in this thesis to demonstrate the effectiveness of the FMCW system, notwithstanding the spectral ghosting complication. The first event from November 21, 2009 is identified as a Type 1 instability and the second from September 13, 2009 is identified as a Type 2 instability which lasted for ~ 16 minutes. Linear plasma fluid theory is used to provide a brief interpretation of both scattering events. |
| 英文关键词 | Atmospheric physics Ionosphere E region Frequency Modulated Continuous Wave Aurora LFM Linearly Frequency Modulated waveform Radar Costas FMCW Radar waveform |
| 语种 | 英语 |
| 来源机构 | University of Saskatchewan |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/244840 |
| 推荐引用方式 GB/T 7714 | Perry;Gareth William. Optimization of a 50 MHz Frequency Modulated Continuous Wave radar system for the study of auroral E-region coherent backscatter[D]. University of Saskatchewan,2010. |
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