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Royal Robbins resting on his aiders during the 3rd pitch of the FA of the Salathé Wall (VI 5.9 C2). Aid climbing traces its origins to the start of all climbing, with ladders used on historic ascents such as the 1492 ascent of Mont Aiguille, the 1786 ascent of Mont Blanc, or the 1893 ascent of Devils Tower, and with drilled bolts on historic ascents such as the 1875 first ascent of Half Dome.
In aid climbing (i.e. the opposite of free climbing), the most widely used system is the A-grade system (e.g. A3+), which was recalibrated in the 1990s as the "new wave" system from the legacy A-grade system. For "clean aid climbing" (i.e. aid climbing equipment is used but only where the equipment is temporary and not permanently hammered into ...
First-free-ascents that set new grade milestones are important events in rock climbing history, and are listed below. While sport climbing has dominated absolute-grade milestones since the mid-1980s (i.e. are now the highest grades), milestones for modern traditional climbing, free solo climbing, onsighted, and flashed ascents, are also listed.
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance. [1] It does this by bouncing a microwave signal off a desired target and analyzing how the object's motion has altered the frequency of the returned signal.
The Regular Northwest Face of Half Dome was the first Grade VI big wall climbing route in the United States. It was first climbed in 1957 by a team consisting of Royal Robbins, Mike Sherrick, and Jerry Gallwas. Its current aid climbing rating is VI 5.9 A1 or 5.12 for the free climbing variation. [1]
Search radar that include pulse-Doppler are usually dual mode because best overall performance is achieved when pulse-Doppler is used for areas with high false alarm rates (horizon or below and weather), while conventional radar will scan faster in free-space where false alarm rate is low (above horizon with clear skies).
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Continuous-wave radar (CW radar) is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects. [1] Individual objects can be detected using the Doppler effect , which causes the received signal to have a different frequency from the transmitted signal ...