Hi,Yes DME is still going strong. Modern interrogators time division multiplex between 3 or more ground stations, giving enough data for the navigation computer to get a position fix. It's the one analogue system that looks like it's got a future. It's compatible with the distance part of the military TACAN (TACtical Air Navigation) system. The original system design in the '50's was very forward thinking and allowed for expansion. They even modulate the pulses (L band around 1000MHz) to piggy-back a datalink on the TACAN signal.Did some work once pulling 0.01nm resolution signals out of a DME for ILS calibration. Robert G8RPI. --- On Sun, 14/2/10, Poul-Henning Kamp <[email protected]> wrote:
From: Poul-Henning Kamp <[email protected]> Subject: Re: [time-nuts] Loran C sounds To: "Discussion of precise time and frequency measurement" <[email protected]> Date: Sunday, 14 February, 2010, 8:34 In message <[email protected]>, Neville Michie wri tes: >We had a system of secondary radar called DME [...] DME is still going strong, and is the main GPS-Backup over Europe for air-traffic. >I do not know how shipping located themselves. Possibly Omega... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
