NASA's
High
Resolution
Microwave
Survey

Statistics from One Year of HRMS Observations

Sky Survey

• 72 Sky Frames observed at 8.4 GHz
  • 40 MHz, dual polarization
  • volume = 37 MHz-Steradians = 3.3x10**-4 of total Sky Survey
  • theoretical limiting sensitivity was achieved (.98 - 5.1 x 10**-22 Wm**-2)
  • each Sky Frame required 1.5 hours to map in one polarization
  • observations remoted to JPL in Jan 1993
  • average of 8 hours per week of observations on 34 m BWG antenna
  • 10 strongest singlets/doublets each frame were followed up in Targeted Search mode
  • 3 candidate signals reacquired in Targeted mode
  • Subsequent observations demonstrated they were RFI
• 130 Maps made of 3 Galactic Plane Sky Frames at 1.7 GHz
  • techniques for map addition successful
  • RFI precluded achieving theoretical sensitivity

Targeted Search

• 24 Target Stars observed in 35 frequency bands each 8 MHz wide, dual pol.
  • Observations lasted 299 or 92 seconds
  • Observing sequence of ON-OFF-ON used throughout
  • 436 successful observing sequences completed in 200 hours observing
  • Hardware detectors reported:
    • 3174 clustered CW signals
    • 3758 clustered Pulse trains (total in all 3 resolutions)
    • 291 CW bad bands
    • 1282 Pulse bad bands
  • Of these, most were signals seen once-and-only-once:
    • 1219 signals during 92 second observations
    • 1310 signals during 299 second observations
  • 15 candidate signals passed ON !OFF ON test
  • none of these signals survived additional confirmation observations
  • RFI precluded reaching theoretical sensitivity limit (5x10**-24 Wm**-2) except at 2380 MHz

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