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Dan Bobyn |
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L1/L2 GPS Receiver Front End Several
L1/L2 GPS Receiver Front Ends have been designed. This
particular design has been utilized in several scientific applications
including being used on an upper atmosphere rocket for space weather
characterization as well as proprietary Cubesat applications. It provides a digitized IF spectrum to an
off-board client-designed digital signal processing engine. A traditional heterodyne downconverter with linear amplification provides a very high quality signal for precise GPS signal processing. A low noise front end, SAW RF and IF filters and integrated VCO PLL local oscillators are used. Subsampling the UHF IF signal entering the A/D eliminates the second LO to simplify the circuitry. The digitized signal is processed inside an on-board CPLD to provide AGC functions and to format the data samples for export. The CPLD also initializes the board hardware so the board operates completely autonomously. This
project began with a study phase to identify a suitable receiver
architecture. The identified design was implemented, prototyped and the
design validated. The complete drawing
package, PCB artworks, BOM details, CPLD code, engineering design
descriptions and manufacturing details were delivered to the client.
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© 2018 Dan Bobyn Engineering Ltd.