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US Glenn L. Martin Company 15,000 km 154,000 kg 9 Mt Inactive 1962 No Silo 29 Minuteman I: US Boeing 1.2 Mt Inactive 1961 No Silo 200 m 30 Minuteman II: US Boeing 1.2 Mt Inactive 1965 No Silo 31 LGM-118 Peacekeeper: US Boeing, Martin Marietta, TRW, 14,000 km 96,750 kg 10 x 300 kt Inactive 1983 Yes Silo 120 m 32 Midgetman: US Martin Marietta ...
Real-time kinematic positioning. Real-time kinematic positioning ( RTK) is the application of surveying to correct for common errors in current satellite navigation (GNSS) systems. It uses measurements of the phase of the signal's carrier wave in addition to the information content of the signal and relies on a single reference station or ...
Fundamental operation A block diagram of a PID controller in a feedback loop. r(t) is the desired process variable (PV) or setpoint (SP), and y(t) is the measured PV.. The distinguishing feature of the PID controller is the ability to use the three control terms of proportional, integral and derivative influence on the controller output to apply accurate and optimal control.
Consequently, accurate measurements of the speed of light yield an accurate realization of the metre rather than an accurate value of c. Astronomical measurements Measurement of the speed of light from the time it takes Io to orbit Jupiter, using eclipses of Io by Jupiter's shadow to precisely measure its orbit.
The time-scale computations on 7 June 2007 weighted 70 of the clocks into the standard. US Naval Observatory outside display of the master clock time. The U.S. Naval Observatory provides public time service via 26 NTP servers on the public Internet, and via telephone voice announcements: +1 202 762-1401 (Washington, DC)
Excalibur. : 40 km (25 mi) [9] The M777 howitzer is a towed 155 mm artillery piece in the howitzer class. It is used by the ground forces of Australia, Canada, Colombia, India, Saudi Arabia, Ukraine, and the United States. It was first used in combat during the War in Afghanistan . The M777 is manufactured by BAE Systems ' Global Combat Systems ...
A Norden bombsight in the nose of the B-29 FIFI. The Norden Mk. XV, known as the Norden M series in U.S. Army service, is a bombsight that was used by the United States Army Air Forces (USAAF) and the United States Navy during World War II, and the United States Air Force in the Korean and the Vietnam Wars.
Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic ...