Frequency estimator performance for a software-based beacon receiver

Zemba, Michael; Morse, J.; Nessel, James A.

doi:10.1109/aps.2014.6905113

Cited by 9 publications

(14 citation statements)

References 5 publications

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“…The 5 MHz IF of the receiver requires modifications in order to maintain similar performance from the frequency estimation routine employed in all NASA GRC-based beacon receivers [34], [35]. The 5 MHz IF signal is sampled by a 12-bit National Instruments 5124 data acquisition (DAQ) card at a sampling frequency of 11.111 MHz.…”

Section: Measurement Setup and Parameter Estimation A Measuremementioning

confidence: 99%

Channel Modeling for Satellite Communication Channels at Q-Band in High Latitude

et al. 2019

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This paper proposes a three-dimensional (3D) channel model for satellite communications at Q-band in a high latitude, including the path loss, shadowing, and small-scale fading. The shadowing effect is modelled by a Markov chain. The three states in the Markov chain are separated by the threshold of the received power level for the link budget and system optimization. The probability density function (PDF) of shadowing amplitude is modelled by a mixture of two Gaussian distributions with parameters obtained by the expectation-maximum (EM) algorithm. The small-scale fading is represented by a 3D geometrybased stochastic model (GBSM) where scatterers are located on the spherical surface of a hemisphere. The movement of the receiver and the Rician factor influenced by environment scattering are considered. Statistical properties including the local temporal autocorrelation function (ACF) and Wigner-Ville spectrum are derived. The satellite communication channel measurement at Q-band is conducted on the campus of Heriot-Watt University (HWU) in Edinburgh, UK. The parameters of our proposed channel model are estimated by the measurement data. Numerical and simulation results demonstrate that our proposed channel model has the ability to reproduce main statistical properties which are also consistent well with the corresponding theoretical and measurement results.

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Section: Measurement Setup and Parameter Estimation A Measuremementioning

confidence: 99%

Channel Modeling for Satellite Communication Channels at Q-Band in High Latitude

et al. 2019

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“…In both Milan and Edinburgh, the downconverted 5 MHz beacon signals are digitized using a National Instruments PCI‐5124 oscilloscope card. Measurement of the signal power is accomplished through a novel frequency estimation technique using a variant of the Quinn‐Fernandes (QNF) frequency estimator, which interpolates the Fast Fourier Transform (FFT). Measurements are recorded at a rate of 10 Hz and are also averaged in real time to 1 Hz.…”

Section: Digital Signal Processingmentioning

confidence: 99%

“…Measurement of the signal power is accomplished through a novel frequency estimation technique 12,13 Several digital processing techniques are also applied to maximize the dynamic range of the receivers by improving their performance in low signal-to-noise ratio environments: the simplest of these is the use of an a priori frequency window to limit the measurement to a small frequency range known to contain the beacon. Because the QNF algorithm begins with a simple peak search, it is susceptible to favoring spurious noise peaks over the true signal when the SNR is low.…”

Section: Frequency Tracking and Windowingmentioning

confidence: 99%

NASA's alphasat propagation terminals: Milan, Italy, and Edinburgh, Scotland

Zemba

Nessel

Riva

et al. 2019

Satell Commun Network

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Summary Since May of 2014, NASA's Glenn Research Center has operated measurement campaigns for the Alphasat Aldo Paraboni Propagation Experiment alongside the European community of propagation experimenters. Presently, three NASA stations have been deployed to distinct climatological regions across Europe. NASA's participation in the campaign began in 2014 through a collaborative effort with the Politecnico di Milano (POLIMI) to jointly operate a 20/40 GHz ground terminal at the POLIMI campus in Milan, Italy. Subsequently, a single‐channel 40 GHz terminal was deployed to Edinburgh, Scotland in March 2016 in collaboration with Heriot‐Watt University (HWU). A third terminal was deployed to NASA's Madrid Deep Space Communications Complex (MDSCC) in March 2017 with NASA'S Jet Propulsion Laboratory (JPL), also observing the 40 GHz beacon. In addition, a fourth station is planned for deployment to Andøya, Norway by early 2019 in collaboration with the Norwegian Defence Research Establishment (FFI). This paper will detail the design and results of the two most established terminals, Milan and Edinburgh, which together comprise 11 station years of propagation measurements.

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“…f an FFT bin, the ent bins and, if se by as much as n be reduced by has the negative ange due to the bandwidth. One ploy a frequency signal frequency signal power at ance of various single bin power dB [3]. As the jacent FFT bins, quency estimator and provide an to the peak FFT dily observable.…”

Section: Frequency Estimation Apmentioning

confidence: 99%

Performance of the NASA beacon receiver for the Alphasat Aldo Paraboni TDP5 propagation experiment

Nessel

Morse

Zemba

et al. 2015

2015 IEEE Aerospace Conference

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NASA Glenn Research Center (GRC) and the Politecnico di Milano (POLIMI) have initiated a joint propagation campaign within the framework of the Alphasat propagation experiment to characterize rain attenuation, scintillation, and gaseous absorption effects of the atmosphere in the 40 GHz band. NASA GRC has developed and installed a K/Q-band (20/40 GHz) beacon receiver at the POLIMI campus in Milan, Italy, which receives the 20/40 GHz signals broadcast from the Alphasat Aldo Paraboni Technology Demonstration Payload (TDP) #5 beacon payload. The primary goal of these measurements is to develop a physical model to improve predictions of communications systems performance within the Q-band. Herein, we describe the design and preliminary performance of the NASA propagation terminal, which has been installed and operating in Milan since June 2014. The receiver is based upon a validated Fast Fourier Transform (FFT) I/Q digital design approach utilized in other operational NASA propagation terminals, but has been modified to employ power measurement via a frequency estimation technique and to coherently track and measure the amplitude of the 20/40 GHz beacon signals. The system consists of a 1.2-m K-band and a 0.6-m Q-band Cassegrain reflector employing synchronous open-loop tracking to track the inclined orbit of the Alphasat satellite. An 8 Hz sampling rate is implemented to characterize scintillation effects, with a 1-Hz measurement bandwidth dynamic range of 45 dB. A weather station with an optical disdrometer is also installed to characterize rain drop size distribution for correlation with physical based models.

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Frequency estimator performance for a software-based beacon receiver

Cited by 9 publications

References 5 publications

Channel Modeling for Satellite Communication Channels at Q-Band in High Latitude

Channel Modeling for Satellite Communication Channels at Q-Band in High Latitude

NASA's alphasat propagation terminals: Milan, Italy, and Edinburgh, Scotland

Performance of the NASA beacon receiver for the Alphasat Aldo Paraboni TDP5 propagation experiment

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