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Cyclostationary Signal Detection and Doppler Rate Correction for LEO Nanosatellites in the ISM Band.
| 题名： | Cyclostationary Signal Detection and Doppler Rate Correction for LEO Nanosatellites in the ISM Band. |
| 作者： | Hofmann, J. |
| 关键词： | Artificial satellites, Nanosatellites, Signal detection, Frequency shift, Doppler effect, Space systems, Satellite communications, Software defined radio, Algorithms, Gaussian processes, Cubesats(cube satellites), Propcube, Cyclostationarity, Spectral correlation, Doppler shift, Doppler rate, Doppler offset |
| 摘要： | The Space Systems Academic Group (SSAG) of the Naval Postgraduate School (NPS) is a pioneer in the development of nanosatellites. While their miniature size promises great possibilities for applications and research, it also poses severe challenges on the communications link. The SSAG operates satellites called PropCube. Often PropCube's signal cannot be demodulated successfully due to high interference in the industrial, scientific and medical (ISM) band and Doppler shifts occurring in the satellite downlink. In this case, it is useful to have the more general information whether the satellites signal is present or not. Moreover, in the next step towards demodulation, the frequency offset must be corrected. In this thesis, a detector is build, which exploits cyclostationary signal characteristics to reliably detect PropCube's GFSK signal in the ISM environment. If the satellites signal is detected, the position of cyclic features in the frequency domain reveal the Doppler offset, which can then be removed. A performance analysis demonstrating the effectiveness of the proposed algorithm is conducted |
| 报告类型： | 科技报告 |
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