Mathematics – Logic
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ssi.....4..351k&link_type=abstract
Space Science Instrumentation, vol. 4, Apr. 1979, p. 351-372. Bundesministerium für Forschung und Technologie
Mathematics
Logic
3
Electrometers, Ionospheric Electron Density, Ionospheric Ion Density, Pioneer Venus 1 Spacecraft, Pioneer Venus 2 Spacecraft, Plasma Diagnostics, Satellite-Borne Instruments, Venus Atmosphere, Computerized Simulation, Current Amplifiers, Data Processing, Electron Distribution, Planetary Ionospheres, Retarding, Telemetry
Scientific paper
The retarding potential analyzer on the Pioneer-Venus Orbiter Mission has been designed to measure most of the thermal plasma parameters within and near the Venusian ionosphere. Parameters include total ion concentration, concentrations of the more abundant ions, ion temperatures, ion drift velocity, electron temperature, and low-energy (0-50 eV) electron distribution function. To accomplish these measurements on a spinning vehicle with a small telemetry bit rate, several functions, including decision functions not previously used in RPA's, have been developed and incorporated into this instrument. The more significant functions include automatic electrometer ranging with background current compensation; digital, quadratic retarding potential step generation for the ion and low-energy electron scans; a current sampling interval of 2 ms throughout all scans; digital logic inflection point detection and data selection; and automatic ram direction detection. Extensive numerical simulation and plasma chamber tests have been conducted to verify adequacy of the design for the Pioneer Mission.
Bakke Jostein
Knudsen William C.
Novak Vaclav
Spenner Karl
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