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Apollo 16 Subsatellite Raw Doppler Frequency Shift Data


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1972-04-27 to 1972-05-28


This data set is from the Apollo 16 subsatellite, which was used to measure the lunar gravitational field based on the dynamical motion. The Doppler velocity resolution is approximately 0.6 mm/s. The Doppler frequency data tapes were originally created on an IBM 7094 computer and are now available on 9-track tapes. The tapes contain high-speed data only (10 observations per second). Each record consists of 90 48-bit words with 10 observation frames per record. The data include CCATS label, station ID, time of year in tenths of seconds, X-angle or local hour angle, Y-angle or declination angle, mission ID, range-rate data (binary counts of nondestruct Doppler cycles), range data, flag bits for frame rate, real/test data, angle tracking mode, Doppler modes, frequency standard ID (prime or back-up oscillator), range data quality, exciter voltage controlled oscillator indicator, range-rate quality, synchronizing codes, and polynomial error code.

Alternate Names

  • Raw Doppler Frequency Data
  • STDN Radar Observations


  • Planetary Science: Geology and Geophysics


  • 72-031D-03A

Additional Information



Questions and comments about this data collection can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Mr. Wilber R. WollenhauptData ProviderNASA Johnson Space Center
Mr. Will YorkGeneral ContactNASA Johnson Space Center

Selected References

  • Apollo 15 and 16 JSC raw doppler frequency data, NSSDC.
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