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According to MRD (461-SYS-RQMT-0019L) RMRD_1307 & RMRD_1363: each spacecraft clock will be kept within 500 microsec with respect to GPS time (1 PPS < 500 microsec of GPS time).

CIDP to IDPU ICD (10160.17-CIDP_FPI_IDPU_ICD-01) RC@IDPU_0180 allocates 50 microsec for the delay from CIPD receipt of the 1 PPS and its issuance of the triple-pulse time-at-tone (TaT)

According to MRD (461-SYS-RQMT-0019L) FPI was granted a waiver (MMS_DW-0233) to exceed the 100 microsec time-tagging requirement.

  • The greatest error observed was 119.5 microsec and we generally allocate 120 microsec for conversatism.
  • Pre-launch testing report (FPI-SYS-RPT-0403) explains the exceedances as a limitation of the testing procedure
  • The results show variability by instrument suite bay (Table 2-4 in FPI-SYS-RPT-0403)
  • No adjustment of the received Time Tags is done to account for these delays.

In General:  FPI time tag difference < 670 microsec with respect to GPS time

 

Assignment of Time Tags to Measurements of Individual FPI Spectrometers and/or Energy Observation

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OR:
mms_load_fpi, /time_clip, trange=trange,probes=sc_num, datatype='dis-moms', level=fpi_level, data_rate=fpidatarate, versions=versions, /center_measurement
mms_load_fpi, /time_clip, trange=trange,probes=sc_num, datatype='des-moms', level=fpi_level, data_rate=fpidatarate, versions=versions, /center_measurement

 

Info

Author for this section:  Conrad Schiff