Doppler Navigation

[Harerton Dourado - HJG]

Hi,

Is there anyone on the forum that's a comercial pilot and has ever flown an aircraft equipped with Doppler Navigation?

I am currently tryingo to program a doppler nav gauge based on a 707 system manual and need some background info from someone who knows the real thing.

Thanks,

[raven]

by doppler nav I think you are refering to the drift indicator maybe? I dunno what they look like in the 707 but I might be able to dig up a drift meter gauge / indicator commonly used by the USAF granted i can find a pic of one....

EDIT:
just looked all I can find is this link to what they do:
www.tpub.com/content/aviation/14030/css/14030_54.htm

basically its a needle that points to the left or right with an airspeed read out below the needle... most gauges are in 2 degree increments up to about 14 degrees either direction. (I cant remember the limit on the ones i saw but its in that realm)

From reading your other threads this might help you out.. OMEGA is was nothing more than a location system to help you get lat longs and you would need to use drift and groundspeed to plot where you are going

Omega tells you where you are, mag heading +- mag variation = (mag course) +- drift = true heading and then the doppler also gives you gs in knots so you can dead reckon with using the omega for a fix and doppler drift / speed to find out where you will be in X minutes.

An INS on the other hand after it is zeroed in (initialized about 10 minutes) on the ground it knows where you are based on accel/ deceleration and turns from the gyros.. now they use laser ring gyro's and they are hella accurate

[chris]

According to my 1968 dc-8 manual, "doppler nav" is a navigational aid normally found on overwater aircraft. It measures actual ground speed, and drift angle (any movement of the aircraft perpendicular to the indicated heading), through the use of doppler radar, and the indication was displayed on a 3" round indicator, which has a deviation needle and a mechanical "digital" readout for the speed. Although in itself, it can't tell you where you are, it was used to show any deviation from the indicated heading and airspeed, so you could correct for the winds aloft, etc, and get where you were headed with more accuracy. In simple terms, it worked like a cop's radar gun.

[Harerton Dourado - HJG]

Thanks Raven and Chris!

As I am figuring out, the drift gauge is easy to do in FS. I understand ground speed, a/c true heading and a/c selected heading are FS parameters. So the hard part is to program what the navigation computer does.

Chris, is it possible for you to scan the info on doppler contained in the dc8 manual?

I´ve been trying to figure this gauge out and I hope I can make it!

[chris]

Sure, I can scan it, but be warned, it is only a couple pages, probably similar to your manual. Just let me know where you'd like me to send them. I also have a 1958 DC-8 systems manual I haven't had a chance to dig out, that may have a lot more information. I'll take a look when I get home tonight and let you know what I find.

Chris

[Harerton Dourado - HJG]

Thanks Chris!

Send it to my email: [e-mail]