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Session C5: Modernized and Emerging GNSS

Characterization of Phase and Amplitude Quantization Effects in a Direct Digital Synthesis-based Waveform Generator for Future Software-Defined GPS Payloads
Pranav R. Patel, Sanjeev Gunawardena, Richard K. Martin, Air Force Institute of Technology
Location: Grand Ballroom E
Date/Time: Thursday, Feb. 1, 4:05 p.m.

Peer Reviewed

This paper describes a software-defined GPS signal generator with a direct digital synthesis (DDS) architecture to examine the effects of quantization on a signal. We explore the power and cardinality of spurious frequency components due to phase and amplitude quantization on the generated signal. MATLAB® models are developed to match the hardware that is implemented in a field programmable gate array (FPGA) with a high speed digital-to-analog converter (DAC). Once the MATLAB model is validated against hardware, it is used to determine the optimal phase and amplitude resolution for given implementation.



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