EOL's Multiple Antenna Profiler (MAPR), generally deployed as part of an ISS (Integrated Sounding System), uses spaced antenna techniques to measure high time resolution wind profiles as short as 30 seconds compared with 15 minutes or longer from traditional profiling techniques. MAPR is well suited to study air motion around frontal boundaries and other small-scale features and precipitation particle dynamics.

The radar operates at 449 MHz and is now being developed to become modularized to make the system scaleable.  For example, for basic boundary layer observations three antenna modules are deployed; to get higher into the atmosphere additional antenna modules are deployed to provide more sensistivity.  The system is also now known as the 449 MHz modular wind profiler.

The multiple antennas are used to make a rapid wind measurement using a technique known as Spaced Antenna Winds.  As the atmosphere moves over the radar, the motion of atmospheric echoes is tracked over the multiple receiving antennas to make a wind measurement.   Measurements can be made on time scales of 30 seconds to 5 minutes, which is considerably faster than the 10-15 minutes required by traditional DBS wind profilers. MAPR can also be run in multiple frequency mode to make RIM (Range IMaging) fine range resolution measurements.

The system was originally developed as a 915 MHz system, based on a Radian (now Vaisala) LAP3000 wind profiler, however was been highly modified in the 1990s, then in totaly rebuilt in 2009-2012 as the modular wind profiler.