Software Solution for Demodulation of a DGPS Receiver using a 32 bit Embedded Microprocessor
We describe a software-based method for the demodulation of FM-multiplexed signals in a DGPS receiver by using a 32-bit embedded microprocessor. Demodulation is needed to extract DGPS data from FM-multiplexed signals in DGPS receivers. Currently, dedicated hardware is required for demodulation becau...
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Published in | Eizō Jōhō Media Gakkaishi Vol. 55; no. 8-9; pp. 1178 - 1185 |
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Main Authors | , , , |
Format | Journal Article |
Language | Japanese |
Published |
The Institute of Image Information and Television Engineers
2001
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Subjects | |
Online Access | Get full text |
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Summary: | We describe a software-based method for the demodulation of FM-multiplexed signals in a DGPS receiver by using a 32-bit embedded microprocessor. Demodulation is needed to extract DGPS data from FM-multiplexed signals in DGPS receivers. Currently, dedicated hardware is required for demodulation because it involves many operations. The proposed method based on the use of software, enables demodulation of FM-multiplexed signals by using a 32-bit embedded microprocessor, thus reducing the size and cost of DGPS receivers. Because LMSK demodulation takes up most of the data-processing time in the demodulation of FM-multiplexed signals, the proposed method focuses on mixing, carrier generation, and accumulation of LMSK demodulation. Practical evaluation of this method shows that the processing load for demodulation of FM-multiplexed signals is 12.4 MIPS, while that for GPS receiver using a DGPS receiver is 48.7 MIPS. These results indicate that the proposed method is practical. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1342-6907 1881-6908 |
DOI: | 10.3169/itej.55.1178 |