This page presents the EMC characterization for RPW in-flight.

EMC Frequency Coverage

Frequency (Hz)OriginImpact on RPW
8
AOCS Synchronisation pulse (ASP)

Impact on SCM which could be mitigated

15 360
MAG drive
Around 50 000

Due to Bias currents. See EMC_Teleconf_11032021_RPW_Status.pdf below for more details.

Large impact on TNR-HFR and TDS
80 000 + harmonicsReaction wheel (RW) electronic box

Large impact on TNR-HFR

120 000

120 kHz lines of the central power distribution unit (PCDU APR converters) radiated by the Solar Panels

Major impact on TNR-HFR

Major impact on TDS but which could be mitigated (flight S/W update)

No impact on LFR

Hereafter the number (6) and frequencies expected from  the PCDU APRs DC/DC Converters (data from frequency plan provided by ADS).


APR#1 DC/DC Converter (~120 kHz)

117,6

Not Xtal

~84Hz/degC. For a 5 degC variation over 1 hour, Δf/f=0.3%; during  TVAC frequency drift  <100 ppm/h for  4 degC variation of PCDU temperature

APR#2 DC/DC Converter (~120 kHz)

118,4

Not Xtal

~84Hz/degC. For a 5 degC variation over 1 hour, Δf/f=0.3%; during  TVAC frequency drift  <100 ppm/h for  4 degC variation of PCDU temperature

APR#3 DC/DC Converter (~120 kHz)

119,3

Not Xtal

~84Hz/degC. For a 5 degC variation over 1 hour, Δf/f=0.3%; during  TVAC frequency drift  <100 ppm/h for  4 degC variation of PCDU temperature

APR#4 DC/DC Converter (~120 kHz)

120,7

Not Xtal

~84Hz/degC. For a 5 degC variation over 1 hour, Δf/f=0.3%; during  TVAC frequency drift  <100 ppm/h for  4 degC variation of PCDU temperature

APR#5 DC/DC Converter (~120 kHz)

121

Not Xtal

~84Hz/degC. For a 5 degC variation over 1 hour, Δf/f=0.3%; during  TVAC frequency drift  <100 ppm/h for  4 degC variation of PCDU temperature

APR#6 DC/DC Converter (~120 kHz)

121,1

Not Xtal

~84Hz/degC. For a 5 degC variation over 1 hour, Δf/f=0.3%; during  TVAC frequency drift  <100 ppm/h for  4 degC variation of PCDU temperature

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