Tom Cwik, the head of JPL’s Space Technology Program (left) and Allen Farrington, JPL Deep Space Atomic Clock Project Manager, view the recently integrated Atomic Clock Payload on Surrey Satellite US’s Orbital Test Bed Spacecraft. Credit: Surrey Satellite Technology. No one keeps time quite like NASA. Last month, the space agency’s next-generation atomic clock was joined to the spacecraft that will take it into orbit in late 2017.
That instrument, the Deep Space Atomic Clock was developed by NASA’s Jet Propulsion Laboratory in Pasadena, California. On Feb. 17, JPL engineers monitored integration of the clock on to the Surrey Orbital Test Bed spacecraft at Surrey Satellite Technology in Englewood, Colorado.
Timekeeping plays a critical role in spacecraft navigation and will be especially important for future deep space missions. This clock will be smaller, lighter and magnitudes more precise than any atomic clock flown in space before.
Most spacecraft are tracked using ”two-way” methods: the ground-based antenna ’pings’ the spacecraft and waits for the signal to return. By measuring how long the signal takes to travel, the distance to the spacecraft can be calculated. A navigation team then processes this information to determine the spacecraft’s flight path and determine if any course corrections are required. The Atomic Clock, GPS Receiver, and Ultra-Stable Oscillator which make up the Deep Space Atomic Clock Payload, following integration into the middle bay of Surrey Satellite US’s Orbital Test Bed Spacecraft. Credit: Surrey Satellite Technology The clock enables ”one-way” tracking, where the spacecraft doesn’t need to send the signal back to Earth. The tracking measurements could be taken onboard and processed with a spacecraft-based navigation system to determine the path and whether any maneuvers are needed to stay on course.
This will be a key advance for safely navigating future human exploration of the solar system by providing astronauts with their position and velocity when they need it. It will lighten the load on the antennas in NASA’s Deep Space Network, allowing more spacecraft to be tracked with a single antenna.
The Deep Space Atomic Clock would also improve the precision and quantity of the radio data used by scientists for determining a planet’s gravity field and probing its atmosphere. Employees at Surrey Satellite US in Englewood, Colorado recently integrated JPL’s Deep Space Atomic Clock payload on to their Orbital Test Bed Spacecraft. Credit: Surrey Satellite Technology Explore further:Why the Deep Space Atomic Clock is key for future space exploration
More information: For more information about the clock, visit www.nasa.gov/mission_pages/tdm/clock/index.html