This thesis deals with the modeling, simulation, and analysis of millimeter and near-millimeter w... more This thesis deals with the modeling, simulation, and analysis of millimeter and near-millimeter wave signals obtained with a reflective antenna. In particular, the work parallels the near-millimeter wave experiment currently being performed at Case Institute of Technology's Atmospheric Propagation Facility. Using a model based upon smooth fluctuation theory, the power spectrums of the intensity scintillation and angle-of-arrival fluctuation are derived for a general beamwave shape and finite transmitter and receiver apertures. These results are then incorporated into a simulation model which is used to predict the receiver output under a wide variety of atmospheric conditions or experimental setups. Parameters incorporated into the simulation model include absorption, dispersion, noise jitter in the angle-of-arrival measurements (due to receiver vibrations), background noise, and instrumentation noise. From the simulated signals, three different signal processing methods are der...
ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed ... more ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed and is currently being implemented at a one mile long test site in Sandusky, Ohio. An optically pumped near-millimeter wave (NMM) laser, used as a source of radiation for frequencies near 300 GHz, is located at one end of this site. The beamwidth of the laser, at the other end of the propagation path, is controlled by a two-lens optical system placed at the laser's output. The receiver, which is controlled by a 68000 microprocessor, consists of a parabolic reflector, focal plane scanner, and a fast liquid helium cooled InSb detector. Measurement of the characteristics of the received beam is based upon a quasi-optical method. Simultaneously with the propagation measurements, the temperature/humidity atmospheric structure parameters and characteristics of hydrometeors in the path are obtained. These two measurements will then be correlated to provide a meteorologically well-verified propagation model for near-millimeter wavelengths.
IEEE Transactions on Instrumentation and Measurement, 1988
ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed ... more ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed and implemented at 1-mile-long test site in Sandusky, OH. Measurements of the atmospheric structure functions and the transverse wind velocity along the propagation path is accomplished with a custom-built meteorological data-acquisition network consisting of six towers linked together with fiber-optic data lines. Each tower is microprocessor controlled and includes a three-axis anemometer, a Lyman-alpha hydrometer, and a differential temperature probe, with other meteorological parameters obtained at various locations along the path. A modified ISO-OSI reference model is used as the controlling protocol
IEEE Transactions on Antennas and Propagation, 1989
ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at opt... more ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at optical and millimeter wavelengths from flux measurements taken at the focal plane of a reflector antenna. The procedure consists of first computing the inverse Abel transform of the flux, taking the Fourier transform of the result, and then dividing by the aperture pupil function. It is shown that when the flux measurements contain additive noise, the Abel inversion is an ill-posed problem. Therefore, calculation of the inverse Abel transform is accomplished by a Kalman filtering algorithm. Results of the mutual coherence function estimator are given for simulated flux measurements
Journal of Atmospheric and Oceanic Technology, Dec 1, 1988
An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean estimato... more An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean estimator using simulated Doppler weather spectra. Results show that the pulse pair method has superior performance, on the basis of estimate variance, under all conditions. An advantage of the adaptive estimator over the pulse pair and Fourier transform methods is its ability to operate in nonstationary environments.
Proceedings of the IEEE 1997 National Aerospace and Electronics Conference. NAECON 1997, 1997
Evaluation of the actual performance capabilities of airborne systems against electronic threats ... more Evaluation of the actual performance capabilities of airborne systems against electronic threats in a real-world environment is one of the foremost concerns in the acceptance of a newly introduced airborne platform. Ground based threat simulator systems have been widely used in both testing and training; however, simulations of airborne emitters are also required to fully test any new aircraft weapon
Journal of Atmospheric and Oceanic Technology, 1988
ABSTRACT An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean... more ABSTRACT An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean estimator using simulated Doppler weather spectra. Results show that the pulse pair method has superior performance, on the basis of estimate variance, under all conditions. An advantage of the adaptive estimator over the pulse pair and Fourier transform methods is its ability to operate in nonstationary environments.
IEEE Transactions on Antennas and Propagation, 1989
ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at opt... more ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at optical and millimeter wavelengths from flux measurements taken at the focal plane of a reflector antenna. The procedure consists of first computing the inverse Abel transform of the flux, taking the Fourier transform of the result, and then dividing by the aperture pupil function. It is shown that when the flux measurements contain additive noise, the Abel inversion is an ill-posed problem. Therefore, calculation of the inverse Abel transform is accomplished by a Kalman filtering algorithm. Results of the mutual coherence function estimator are given for simulated flux measurements
ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed ... more ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed and is currently being implemented at a one mile long test site in Sandusky, Ohio. An optically pumped near-millimeter wave (NMM) laser, used as a source of radiation for frequencies near 300 GHz, is located at one end of this site. The beamwidth of the laser, at the other end of the propagation path, is controlled by a two-lens optical system placed at the laser's output. The receiver, which is controlled by a 68000 microprocessor, consists of a parabolic reflector, focal plane scanner, and a fast liquid helium cooled InSb detector. Measurement of the characteristics of the received beam is based upon a quasi-optical method. Simultaneously with the propagation measurements, the temperature/humidity atmospheric structure parameters and characteristics of hydrometeors in the path are obtained. These two measurements will then be correlated to provide a meteorologically well-verified propagation model for near-millimeter wavelengths.
This thesis deals with the modeling, simulation, and analysis of millimeter and near-millimeter w... more This thesis deals with the modeling, simulation, and analysis of millimeter and near-millimeter wave signals obtained with a reflective antenna. In particular, the work parallels the near-millimeter wave experiment currently being performed at Case Institute of Technology's Atmospheric Propagation Facility. Using a model based upon smooth fluctuation theory, the power spectrums of the intensity scintillation and angle-of-arrival fluctuation are derived for a general beamwave shape and finite transmitter and receiver apertures. These results are then incorporated into a simulation model which is used to predict the receiver output under a wide variety of atmospheric conditions or experimental setups. Parameters incorporated into the simulation model include absorption, dispersion, noise jitter in the angle-of-arrival measurements (due to receiver vibrations), background noise, and instrumentation noise. From the simulated signals, three different signal processing methods are der...
ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed ... more ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed and is currently being implemented at a one mile long test site in Sandusky, Ohio. An optically pumped near-millimeter wave (NMM) laser, used as a source of radiation for frequencies near 300 GHz, is located at one end of this site. The beamwidth of the laser, at the other end of the propagation path, is controlled by a two-lens optical system placed at the laser's output. The receiver, which is controlled by a 68000 microprocessor, consists of a parabolic reflector, focal plane scanner, and a fast liquid helium cooled InSb detector. Measurement of the characteristics of the received beam is based upon a quasi-optical method. Simultaneously with the propagation measurements, the temperature/humidity atmospheric structure parameters and characteristics of hydrometeors in the path are obtained. These two measurements will then be correlated to provide a meteorologically well-verified propagation model for near-millimeter wavelengths.
IEEE Transactions on Instrumentation and Measurement, 1988
ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed ... more ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed and implemented at 1-mile-long test site in Sandusky, OH. Measurements of the atmospheric structure functions and the transverse wind velocity along the propagation path is accomplished with a custom-built meteorological data-acquisition network consisting of six towers linked together with fiber-optic data lines. Each tower is microprocessor controlled and includes a three-axis anemometer, a Lyman-alpha hydrometer, and a differential temperature probe, with other meteorological parameters obtained at various locations along the path. A modified ISO-OSI reference model is used as the controlling protocol
IEEE Transactions on Antennas and Propagation, 1989
ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at opt... more ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at optical and millimeter wavelengths from flux measurements taken at the focal plane of a reflector antenna. The procedure consists of first computing the inverse Abel transform of the flux, taking the Fourier transform of the result, and then dividing by the aperture pupil function. It is shown that when the flux measurements contain additive noise, the Abel inversion is an ill-posed problem. Therefore, calculation of the inverse Abel transform is accomplished by a Kalman filtering algorithm. Results of the mutual coherence function estimator are given for simulated flux measurements
Journal of Atmospheric and Oceanic Technology, Dec 1, 1988
An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean estimato... more An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean estimator using simulated Doppler weather spectra. Results show that the pulse pair method has superior performance, on the basis of estimate variance, under all conditions. An advantage of the adaptive estimator over the pulse pair and Fourier transform methods is its ability to operate in nonstationary environments.
Proceedings of the IEEE 1997 National Aerospace and Electronics Conference. NAECON 1997, 1997
Evaluation of the actual performance capabilities of airborne systems against electronic threats ... more Evaluation of the actual performance capabilities of airborne systems against electronic threats in a real-world environment is one of the foremost concerns in the acceptance of a newly introduced airborne platform. Ground based threat simulator systems have been widely used in both testing and training; however, simulations of airborne emitters are also required to fully test any new aircraft weapon
Journal of Atmospheric and Oceanic Technology, 1988
ABSTRACT An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean... more ABSTRACT An adaptive mean frequency estimator is compared to the pulse pair (autocovariance) mean estimator using simulated Doppler weather spectra. Results show that the pulse pair method has superior performance, on the basis of estimate variance, under all conditions. An advantage of the adaptive estimator over the pulse pair and Fourier transform methods is its ability to operate in nonstationary environments.
IEEE Transactions on Antennas and Propagation, 1989
ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at opt... more ABSTRACT An algorithm is presented for computing the atmospheric mutual coherence function at optical and millimeter wavelengths from flux measurements taken at the focal plane of a reflector antenna. The procedure consists of first computing the inverse Abel transform of the flux, taking the Fourier transform of the result, and then dividing by the aperture pupil function. It is shown that when the flux measurements contain additive noise, the Abel inversion is an ill-posed problem. Therefore, calculation of the inverse Abel transform is accomplished by a Kalman filtering algorithm. Results of the mutual coherence function estimator are given for simulated flux measurements
ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed ... more ABSTRACT Instrumentation for studying the propagation of near-millimeter waves has been designed and is currently being implemented at a one mile long test site in Sandusky, Ohio. An optically pumped near-millimeter wave (NMM) laser, used as a source of radiation for frequencies near 300 GHz, is located at one end of this site. The beamwidth of the laser, at the other end of the propagation path, is controlled by a two-lens optical system placed at the laser's output. The receiver, which is controlled by a 68000 microprocessor, consists of a parabolic reflector, focal plane scanner, and a fast liquid helium cooled InSb detector. Measurement of the characteristics of the received beam is based upon a quasi-optical method. Simultaneously with the propagation measurements, the temperature/humidity atmospheric structure parameters and characteristics of hydrometeors in the path are obtained. These two measurements will then be correlated to provide a meteorologically well-verified propagation model for near-millimeter wavelengths.
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Papers by J. Sitterle