Cyclostationary Signal Detection and Doppler Rate Correction for LEO Nanosatellites in the ISM Band
Abstract
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 satellite’s 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 satellite’s 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.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.NPS Report Number
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