Computer/Embedded Technology


Rugged VPX position, navigation and timing board

24 November 2021 Computer/Embedded Technology

A rugged plug-in card has been introduced by Concurrent Technologies for position, navigation and timing (PNT) in a 3U VPX form factor. Designed in alignment with the SOSA technical standard (The Open Group’s ‘sensor open systems architecture), Concurrent’s new PR A11/61d-RCR provides resilient PNT data for sensor-based solutions that are used in electronic warfare and intelligence, surveillance and reconnaissance applications. As a key differentiator, the board is ITAR-free and is designed and built in the UK utilising technology licensed from Racelogic, another UK company specialising in positioning data.

In normal operation, the PR A11/61d-RCR sources highly accurate PNT data from a built-in GNSS receiver and uses this to discipline a chip-scale atomic clock (CSAC). This, in turn, feeds radial clock signals to the signal processing plug-in cards that make up a VPX-based sensor subsystem. In periods of GNSS denial or jamming, accurate PNT data continues to be provided by utilising signals from an on-board inertial measurement unit and sophisticated Kalman filtering techniques. The timing slot on most commercially available backplanes supports one or two 10GBASE-KR pipes and the PR A11/61d-RCR is controlled using one of these pipes. Bussed clock signals are also supported for backward compatibility with older VPX systems.


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