The solar probe plus radio frequency spectrometer: Measurement requirements, analog design, and digital signal processing

Author
Keywords
Abstract
<p>The Radio Frequency Spectrometer (RFS) is a two-channel digital receiver and spectrometer, which will make remote sensing observations of radio waves and in situ measurements of electrostatic and electromagnetic fluctuations in the solar wind. A part of the FIELDS suite for Solar Probe Plus (SPP), the RFS is optimized for measurements in the inner heliosphere, where solar radio bursts are more intense and the plasma frequency is higher compared to previous measurements at distances of 1 AU or greater. The inputs to the RFS receiver are the four electric antennas mounted near the front of the SPP spacecraft and a single axis of the SPP search coil magnetometer (SCM). Each RFS channel selects a monopole or dipole antenna input, or the SCM input, via multiplexers. The primary data products from the RFS are autospectra and cross spectra from the selected inputs. The spectra are calculated using a polyphase filter bank, which enables the measurement of low amplitude signals of interest in the presence of high-amplitude narrowband noise generated by spacecraft systems. We discuss the science signals of interest driving the RFS measurement objectives, describe the RFS analog design and digital signal processing, and show examples of current performance.</p>
Year of Publication
2017
Journal
Journal of Geophysical Research: Space Physics
Volume
1362047113616189401368623119441717820412252301146645116115291331061362045128930183120
Number
Number of Pages
2836-2854
Date Published
03/2017
URL
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JA023345
DOI
10.1002/2016JA023345