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SDR Input Power Estimation AlgorithmsThe General Dynamics (GD) S-Band software defined radio (SDR) in the Space Communications and Navigation (SCAN) Testbed on the International Space Station (ISS) provides experimenters an opportunity to develop and demonstrate experimental waveforms in space. The SDR has an analog and a digital automatic gain control (AGC) and the response of the AGCs to changes in SDR input power and temperature was characterized prior to the launch and installation of the SCAN Testbed on the ISS. The AGCs were used to estimate the SDR input power and SNR of the received signal and the characterization results showed a nonlinear response to SDR input power and temperature. In order to estimate the SDR input from the AGCs, three algorithms were developed and implemented on the ground software of the SCAN Testbed. The algorithms include a linear straight line estimator, which used the digital AGC and the temperature to estimate the SDR input power over a narrower section of the SDR input power range. There is a linear adaptive filter algorithm that uses both AGCs and the temperature to estimate the SDR input power over a wide input power range. Finally, an algorithm that uses neural networks was designed to estimate the input power over a wide range. This paper describes the algorithms in detail and their associated performance in estimating the SDR input power.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Nappier, Jennifer M.
(NASA Glenn Research Center Cleveland, OH, United States)
Briones, Janette C.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 27, 2013
Publication Date
March 2, 2013
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
Meeting Information
Meeting: 2013 IEEE Aerospace Conference
Location: Big Sky, MT
Country: United States
Start Date: March 2, 2013
End Date: March 9, 2013
Sponsors: American Inst. of Aeronautics and Astronautics, PHM Society, Institute of Electrical and Electronics Engineers
Funding Number(s)
WBS: WBS 553323.
Distribution Limits
Work of the US Gov. Public Use Permitted.
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