NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Lunar Sounder Data Plots of Amplitude vs Time of Position of Spacecraft on Comp PA


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

Time span: 1972-12-11 to 1972-12-16


This data set consists of 70-mm filmed plots of HF-2 data at a frequency of 15 MHz processed using the Environmental Research Institute of Michigan Precision Optical Processor Facility. The HF-2 system was designed for partial overlap with the HF-1 system, trading off depth of exploration for improved resolution. Chirped pulses were transmitted at a rate of 400 pulses per sec. The HF-2 image was processed with an azimuth demagnification of 69.85. The frequency-plane aperture was set so that slant range and azimuth resolution were 100 m. Range weighting was used to reduce range sidelobes, degrading range resolution by a factor of approximately 2.2 times. The film scale parameters are 7.16 x 10 to the minus 2 mm per sec along the film and 4.04 x 10 to the 4 mm per sec across the film. Locations can be determined by measuring from the breaks in the data when the sounder was turned on and off. See table 1 in data set 72-096A-04D. A holographic viewer is required to interpret the data on these plots. Due to instrument variations, different viewers could give results which don't agree with each other.

Alternate Names

  • Lunar Sounder Data Plots HF2


  • Planetary Science: Geology and Geophysics


  • 72-096A-04B

Additional Information



Questions and comments about this data collection can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Mr. G. F. AdamsData ProviderUniversity of Michigan
Mr. G. F. AdamsGeneral ContactUniversity of Michigan
Dr. Roger J. PhillipsGeneral ContactNASA Jet Propulsion
[] NASA Logo -