Remote probing of atmospheric phenomena has become an area of intense research during the past decade. One result of this research is a technique for remote measurement of temperature profiles in the lower troposphere, which was developed and is being tested at Stanford University. This technique is based on the concept of Doppler-tracking an acoustic pulse by an electromagnetic radar; hence the name radio-acoustic sounding system (RASS). With this system, real-time temperature profiles from near ground level to 1 to 3 km have been obtained. These data compare in accuracy with those obtained from radiosondes; however, use of the RASS is a much more cost-effective procedure.
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