Defense Advanced Research Projects AgencyTagged Content List

Position, Navigation and Timing

Technologies relating to precision geolocation, time-keeping and synchronization

Showing 46 results for PNT RSS
08/05/2013
How do you take the temperature of a cell? The familiar thermometer from a doctor’s office is slightly too big considering the average human skin cell is only 30 millionths of a meter wide. But the capability is significant; developing the right technology to gauge and control the internal temperatures of cells and other nanospaces might open the door to a number of defense and medical applications: better thermal management of electronics, monitoring the structural integrity of high-performance materials, cell-specific treatment of disease and new tools for medical research.
08/29/2013
Researchers from the National Institute of Standards and Technology (NIST), with funding from DARPA’s Quantum-Assisted Sensing and Readout (QuASAR) program, have built a pair of ytterbium atomic clocks that measure time with a precision that is approximately ten times better than the world’s previous best clocks, also developed under QuASAR. How good are they? The record-setting clocks are stable to within less than two parts per quintillion (1 followed by 18 zeros). They measure time so precisely that their readout would be equivalent to specifying the Earth’s diameter to less than the width of a single atom or the age of the known universe to less than one second.
03/13/2014
At the break of dawn on March 13, 2004, 15 vehicles left a starting gate in the desert outside of Barstow, Calif., to make history in the DARPA Grand Challenge, a first-of-its-kind race to foster the development of self-driving ground vehicles. The immediate goal: autonomously navigate a 142-mile course that ran across the desert to Primm, Nev. The longer-term aim was to accelerate development of the technological foundations for autonomous vehicles that could ultimately substitute for men and women in hazardous military operations, such as supply convoys.
07/24/2014
It is difficult to imagine the modern world without the Global Positioning System (GPS), which provides real-time positioning, navigation and timing (PNT) data for countless military and civilian uses. Thanks in part to early investments that DARPA made to miniaturize GPS technology, GPS today is ubiquitous. It’s in cars, boats, planes, trains, smartphones and wristwatches, and has enabled advances as wide-ranging as driverless cars, precision munitions, and automated supply chain management.
12/23/2015
One of the greatest episodes in the history of clockmaking unfolded over three decades during the 18th century in response to a government challenge to overcome a daunting and often deadly problem: Find a way to reliably determine a ship’s east-west position, or longitude, on the high seas. British clockmaker John Harrison won the prize, equivalent to millions of today’s dollars, for his invention of a chronometer that remained stable enough for navigators to make accurate longitude calculations even during long-distance sea voyages.