In this paper, we investigate the ability of the Arecibo Observatory to characterize the orbital ... more In this paper, we investigate the ability of the Arecibo Observatory to characterize the orbital debris environment and compare it to the primary instrument used by NASA’s Orbital Debris Program Office, the Haystack Ultra-Wideband Satellite Imaging Radar (HUSIR). Arecibo’s location (18.°3 N) increases the percentage of observable orbits (relative to HUSIR) by 27%, which gives Arecibo access to a much larger and previously unmeasured portion of the environment. Due to the recent collapse of the Arecibo dish, in addition to exploring historic capabilities of the Legacy Arecibo Telescope, estimates of the performance of the proposed Next Generation Arecibo Telescope (NGAT) are explored. We show that the current NGAT design could have a sensitivity comparable to the Goldstone Orbital Debris Radar, currently NASA’s most sensitive orbital debris radar. Additionally, design suggestions are presented that would significantly improve the capabilities of the NGAT for orbital debris investigat...
Recent advances in recording technology and computational power have made possible the developmen... more Recent advances in recording technology and computational power have made possible the development of a wide bandwidth digital recording system for radio astronomy. A prototype 50 MHz bandwidth system along with two production systems with 10-50 MHz bandwidth have been designed and built at Caltech. Signal processing techniques have been developed in order to remove various artifacts introduced into the signal by the digitization process. These techniques along with various pulsar signal processing algorithms have been successfully implemented in a suite of highly portable analysis programs designed to run on multi-purpose parallel supercomputers, networked workstations, and stand-alone workstations. The single pulse radio emission properties of the bright millisecond pulsar PSR J0437-4715 have been studied using standard analysis methods. New techniques have been developed in order to study the single pulse properties of "weak" or low-intensity pulsars. These techniques h...
and the LWA ConsortiumExecutive Summary The Long Wavelength Array (LWA), currently under construc... more and the LWA ConsortiumExecutive Summary The Long Wavelength Array (LWA), currently under construction in New Mexico, will be an imaging HF/VHF interferometer providing a new approach for studying the Sun-Earth environment from the surface of the sun through the Earth’s ionosphere [1]. The LWA will be a powerful tool for solar physics and space weather investigations, through its ability to characterize a diverse range of lowfrequency, solar-related emissions, thereby increasing our understanding of particle acceleration and shocks in the solar atmosphere along with their impact on the Sun-Earth environment. As a passive receiver the LWA will directly detect Coronal Mass Ejections (CMEs) in emission, and indirectly through the scattering of cosmic background sources. If coupled with a suitable transmitter, the LWA would be an excellent receiver for solar radar, potentially demonstrating accurate geomagnetic storm prediction from the Earth’s surface. Both radar and passive receiving t...
L'invention concerne des procedes permettant d'analyser les fluides de formation dans un ... more L'invention concerne des procedes permettant d'analyser les fluides de formation dans un environnement de champ petrolifere par spectroscopie d'absorption a proche infrarouge. Des indications d'absorption a proche infrarouge sont analysees afin de determiner la teneur des composes dans un echantillon de fluide de formation.
: The Low-Frequency All-Sky Monitor (LoFASM) is an innovative new radio astronomy observatory. De... more : The Low-Frequency All-Sky Monitor (LoFASM) is an innovative new radio astronomy observatory. Designed and built by faculty and by graduate, undergraduate, and high-school students, it is the first instrument specifically designed for the detection of low-frequency (10 to 88 MHz) astrophysical radio transients. It consists of four geographically-separated stations, each comprising 12 phased array dipole antennas. All four stations have now started taking data. The observatory has also been a vital recruiting and training tool for physics students from the South Texas region. LoFASM was instrumental in establishing the Spacecraft Tracking and Astronomical Research into Gigahertz Astrophysical Transient Emission (STARGATE) project, a public-private partnership between UTB's Center for Advanced Radio Astronomy and SpaceX, focused on RF technology innovation and commercialization. Where this DoD grant funded the deployment and commissioning of LoFASM, an NSF grant has recently been...
In this paper, we investigate the ability of the Arecibo Observatory to characterize the orbital ... more In this paper, we investigate the ability of the Arecibo Observatory to characterize the orbital debris environment and compare it to the primary instrument used by NASA’s Orbital Debris Program Office, the Haystack Ultra-Wideband Satellite Imaging Radar (HUSIR). Arecibo’s location (18.°3 N) increases the percentage of observable orbits (relative to HUSIR) by 27%, which gives Arecibo access to a much larger and previously unmeasured portion of the environment. Due to the recent collapse of the Arecibo dish, in addition to exploring historic capabilities of the Legacy Arecibo Telescope, estimates of the performance of the proposed Next Generation Arecibo Telescope (NGAT) are explored. We show that the current NGAT design could have a sensitivity comparable to the Goldstone Orbital Debris Radar, currently NASA’s most sensitive orbital debris radar. Additionally, design suggestions are presented that would significantly improve the capabilities of the NGAT for orbital debris investigat...
Recent advances in recording technology and computational power have made possible the developmen... more Recent advances in recording technology and computational power have made possible the development of a wide bandwidth digital recording system for radio astronomy. A prototype 50 MHz bandwidth system along with two production systems with 10-50 MHz bandwidth have been designed and built at Caltech. Signal processing techniques have been developed in order to remove various artifacts introduced into the signal by the digitization process. These techniques along with various pulsar signal processing algorithms have been successfully implemented in a suite of highly portable analysis programs designed to run on multi-purpose parallel supercomputers, networked workstations, and stand-alone workstations. The single pulse radio emission properties of the bright millisecond pulsar PSR J0437-4715 have been studied using standard analysis methods. New techniques have been developed in order to study the single pulse properties of "weak" or low-intensity pulsars. These techniques h...
and the LWA ConsortiumExecutive Summary The Long Wavelength Array (LWA), currently under construc... more and the LWA ConsortiumExecutive Summary The Long Wavelength Array (LWA), currently under construction in New Mexico, will be an imaging HF/VHF interferometer providing a new approach for studying the Sun-Earth environment from the surface of the sun through the Earth’s ionosphere [1]. The LWA will be a powerful tool for solar physics and space weather investigations, through its ability to characterize a diverse range of lowfrequency, solar-related emissions, thereby increasing our understanding of particle acceleration and shocks in the solar atmosphere along with their impact on the Sun-Earth environment. As a passive receiver the LWA will directly detect Coronal Mass Ejections (CMEs) in emission, and indirectly through the scattering of cosmic background sources. If coupled with a suitable transmitter, the LWA would be an excellent receiver for solar radar, potentially demonstrating accurate geomagnetic storm prediction from the Earth’s surface. Both radar and passive receiving t...
L'invention concerne des procedes permettant d'analyser les fluides de formation dans un ... more L'invention concerne des procedes permettant d'analyser les fluides de formation dans un environnement de champ petrolifere par spectroscopie d'absorption a proche infrarouge. Des indications d'absorption a proche infrarouge sont analysees afin de determiner la teneur des composes dans un echantillon de fluide de formation.
: The Low-Frequency All-Sky Monitor (LoFASM) is an innovative new radio astronomy observatory. De... more : The Low-Frequency All-Sky Monitor (LoFASM) is an innovative new radio astronomy observatory. Designed and built by faculty and by graduate, undergraduate, and high-school students, it is the first instrument specifically designed for the detection of low-frequency (10 to 88 MHz) astrophysical radio transients. It consists of four geographically-separated stations, each comprising 12 phased array dipole antennas. All four stations have now started taking data. The observatory has also been a vital recruiting and training tool for physics students from the South Texas region. LoFASM was instrumental in establishing the Spacecraft Tracking and Astronomical Research into Gigahertz Astrophysical Transient Emission (STARGATE) project, a public-private partnership between UTB's Center for Advanced Radio Astronomy and SpaceX, focused on RF technology innovation and commercialization. Where this DoD grant funded the deployment and commissioning of LoFASM, an NSF grant has recently been...
Uploads
Papers by Fredrick Jenet