[time-nuts] Loran C sounds

Robert Atkinson robert8rpi at yahoo.co.uk
Sun Feb 14 10:53:34 UTC 2010


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 <phk at phk.freebsd.dk> wrote:

From: Poul-Henning Kamp <phk at phk.freebsd.dk>
Subject: Re: [time-nuts] Loran C sounds
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Sunday, 14 February, 2010, 8:34

In message <C33E8481-7F7B-4E45-AC70-9FB896AB6C88 at gmail.com>, 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
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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