Engineering topics
Kellogg, K.
Publications and source records attributed to Kellogg, K..
Overview of the QuikSCAT and SeaWinds on ADEOS II missions
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Overview of the SeaWinds and the planned AlphaSCAT instrument and missions
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Advanced design concepts for a SeaWinds scatterometer follow-on mission
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Sea Winds on QuikSCAT: Sensor Description and Mission Overview
The SeaWinds instrument is the first pencil-beam scatterometer to routinely measure ocean surface winds from space.
Design and Near-Field Measurement Performance Evaluation of the SeaWinds Dual-Beam Reflector Antenna
This paper presents the design and performance evaluation of a lightweight, composite material, elliptical-aperture, parabolic-reflector antenna.
Design and Near-Field Measurement Performance Evaluation of the Sea Winds Dual- Beam Reflector Antenna
This paper presents the design and performance evaluation of a lightweight, composite material, elliptical-aperture, parabolic-reflector antenna. The performance characterization is obtained using the cylindrical near-field measurement facility at JPL as shown. The reflector has been designed and calibrated for the SeaWinds spaceborne scatterometer instrument. The instrument operates at Ku-band and is designed to accurately measure wind speed and direction over Earth's ocean surface. The SeaWinds antenna design requires two linearly polarized independent beams pointed at 40 deg.and 46 deg. from nadir as shown. The inner beam, pointed at 40 deg. from nadir, is horizontally polarized with 1.6 in x 1.8 in required beamwidths in the elevation and azimuth planes, respectively. The outer beam, pointed at 46 deg. from nadir, is vertically polarized with 1.4 in x 1.7 in required beamwidths. Noteworthy, the reflector boresight axis is pointed at 43 deg. from nadir. Both beams are required to have the first sidelobe level below -15 dB relative to the peak of the beam.
Microtechnology in Telecommunicaton for Spacecraft Cost and Mass Reduction
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Microtechnology in Telecommunications for Spacecraft Cost and Mass Reduction
This paper examines the incorporation of both microelectronics and micromachining (termed microtechnologies) as applied to deep space telecommunication subsystems. Using the Pluto Fast Flyby Pre-Project as a main case study we have reduced the subsystem mass by 50%.
Proposed Solar Probe telecommunications system concept
A proposed telecommunications system concept for NASA's Solar Probe mission is described. Key system requirements include 70 kbps data rate at perihelion and operation at X-band (uplink/downlink) and Ka-band (downlink). A design control table is presented to demonstrate design compliance with telecommunication needs. The Ka-band feed is to be a hexagonal array of 37 active elements, each containing 1/4W HEMT amplifiers. The array is located at the Cassegrain point of a 0.75-m reflector. When compared to the TWTA-based system, the Ka-band active array feed provides advantages of reduced mass, increased dc power efficiency, enhanced reliability, graceful degradation, and reduced volume requirements.
Proposed Ka-band array-fed near field Cassegrain system for NASA's Polar Probe Mission
A Ka-band array-fed near-field Cassegrain antenna envisioned for NASA's Solar Probe Mission is the basis of the present spacecraft telecommunications system, which is designed for operation at X-band up/downlink and Ka-band downlink. The hexagonal array employed, which is located at the Cassegrain point of the 0.75-m reflector, encompasses 37 active elements; each of these contains 1/4-W HEMT amplifiers. Relative to a TWTA-based system, this active array feed reduces mass, increases dc power efficiency, enhanced reliability, and reduces volume requirements.