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DCS F-14 Update - All About Inertia!


Cobra847

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Awesome, just awesome work! That's the kind of stuff I really love to see!

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Incredibly interesting update! Eagerly looking forward to the next one. Keep up the good work!

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I already asked these question in a different part of the forum, and with the excellent eye and attention to detail you fine fellows from HB provide us with I have no doubt we will see an equally excellent documentation set explaining my question in detail;

 

But how does the GPS available from the Lightning pod factor into the navigation aspect (broadly speaking)? Or is that only useable to send info to the guided weapons (CDU's only on the F14 AFAIK?)?

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Iirc first lantirn integration was a hack of the video feed into the TCS feed. So there would be not much avionics integration. But I could be wrong.

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But how does the GPS available from the Lightning pod factor into the navigation aspect (broadly speaking)? Or is that only useable to send info to the guided weapons (CDU's only on the F14 AFAIK?)?

 

The LANTIRN Targeting System (LTS) used on the F-14 got rid of the original LANTIRN two pod system, and didn't use the terrain avoidance/following navigation pod. Instead, the LTS itself got GPS and IMU integrated, but the LTS as a whole was not tightly integrated into the F-14 systems at all, basically just a control panel was installed in the RIO cockpit left panel (joystick and some hats and a few switches) and the LTS video output could be viewed on the RIO's TID TV selection and the pilot's VDI TV repeat selection (essentially both of those are just aux video input selections). The LTS video could show own GPS coordinates, as well as calculated ground point (or tracked target) coordinates (calculated from laser range together with azimuth+elevation), so the RIO would be able to manually use that to enter coordinates on the CAP+TID to do a nav fix. I don't think the LTS and F-14A/B were able to directly use GPS/INS weapons (e.g. JDAM, JSOW, WCMD), but they were able to generate accurate enough coordinates for other aircraft to deploy these weapons on target. Of course, LTS was used with laser guided bombs on the F-14 itself.

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GPS navigation came to F-14B as a part of the F-14B Upgrade program, when the AN/ASN-92 were replaced by the new EGI (Embedded GPS/INS) units from Honeywell as a part of a deep avionics change. Updating AN/ASN-92 and the whole set of the routines to include GPS abilities was probably much more complicated than replacing the entire system.

 

A not-so-official upgrade allowing for GPS navigation was to get a personal Garmin 95XL.

 

But as far as I know, it was impossible to inject GPS data from the pod to the INS.


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That's very interesting indeed. Thanks for the insight!

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Woah...

 

I am guessing all this is mainly for the A model ? As you mentioned the B variant got the EGI.

 

I got a question about the in-flight corrections ?

 

Will you go in detail how they are done ?

 

Are they automated ? or does it put a workload on the RIO ?

 

The RIO can improve (restore) the precision of the INS in-flight by updating the aircraft position:

With the radar by locking on the known reference point (waypoint);

Using TACAN signal and known coordinates of the TACAN station stored as a waypoint;

By overflying a visual reference point;

Using data-link, either when flying in close formation, or by hooking a radar track of the cooperating aircraft.

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As you mentioned the B variant got the EGI.

 

From the beginning? I understood that as beeing a later upgrade that came to the F-14B later on.

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Initially, the F-14B had AN/ASN-92, so this topic - the update on the INS for Heatblur F-14 - stands for both A and B. The EGI was a part of the "F-14B Upgrade" which entered into service in the late '90s.

 

 

An update procedure is initiated manually, although the updated position is calculated automatically. For example, in case of a TACAN update it looks as follows:

 

  1. Tune a TACAN in range.
  2. Hook a point (waypoint, Fix, Home Base, etc.) which is located where the TACAN station is. If you don't have the TACAN assigned to a point, you have to store the coordinates of the TACAN in one of the points first, and then use this point for the update.
  3. Select NAV category on CAP.
  4. Press TACAN FIX.
  5. On the TID, read and verify the position delta (position shift to be applied).
  6. Press FIX ENABLE to apply the delta.

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A not-so-official upgrade allowing for GPS navigation was to get a personal Garmin 95XL.

 

But as far as I know, it was impossible to inject GPS data from the pod to the INS.

 

Sooooo... Might we be able to get a lawyer-friendly 95XL look-alike at some point? ^.^

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From the beginning? I understood that as beeing a later upgrade that came to the F-14B later on.

 

Guess, I misunderstood as mentioned in the next post

 

Initially, the F-14B had AN/ASN-92, so this topic - the update on the INS for Heatblur F-14 - stands for both A and B. The EGI was a part of the "F-14B Upgrade" which entered into service in the late '90s.

 

 

An update procedure is initiated manually, although the updated position is calculated automatically. For example, in case of a TACAN update it looks as follows:

 

  1. Tune a TACAN in range.
  2. Hook a point (waypoint, Fix, Home Base, etc.) which is located where the TACAN station is. If you don't have the TACAN assigned to a point, you have to store the coordinates of the TACAN in one of the points first, and then use this point for the update.
  3. Select NAV category on CAP.
  4. Press TACAN FIX.
  5. On the TID, read and verify the position delta (position shift to be applied).
  6. Press FIX ENABLE to apply the delta.

 

Yeah, this is what I meant, you don't have manually start adjusting stuff, just dual in the correct stuff and push couple of buttons (said in a simple manner)

 

This is all cool, would have liked to see some EGI, but we can dial with what we've got. Thank you !

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So for this version of the F-14B we are getting dumb bombs and laser guided bombs. JDAM was not in the "B" suite modeled by Heatblur?

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So for this version of the F-14B we are getting dumb bombs and laser guided bombs. JDAM was not in the "B" suite modeled by Heatblur?

Yes, that's my understanding as well.

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Hello,

 

I still don't get what is INS alignment process exactly… Given the fact that it drifts anyway, and the position can be updated while flying or waiting on the carrier's deck, doesn't it consist to just spool up gyros and tell the computer this is now that position/heading/altitude ? Must the gyro be in a specific position according to the aircraft's position before flying ?

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Hello,

 

I still don't get what is INS alignment process exactly… Given the fact that it drifts anyway, and the position can be updated while flying or waiting on the carrier's deck, doesn't it consist to just spool up gyros and tell the computer this is now that position/heading/altitude ? Must the gyro be in a specific position according to the aircraft's position before flying ?

 

Non-technically speaking, the gyro needs to figure what is zero movement and by that I mean standing still on the ground. Sounds easy at first, but then you have to consider that while we are standing still on the ground we are moving through space as the earth rotates. That means, that the highly sensitive gyros need to figure out at what kind of "movement" the aircraft is standing still on the ground, so it can base all future aircraft movements on this zeroed in movement value. This is the alignment process and that takes some time.

This process obviously is much more difficult on an aircraft carrier as explained in the OP.

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DCS Panavia Tornado (IDS) really needs to be a thing!

 

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What a waste of time...I didn't understand ANY of that...BUT ITS COOL!

 

Seriously outstanding work.

 

When I was in the Air Force we had a Comm/Nav guy at Beale that could explain why the INS worked...Not how...WHY. He usually knew exactly what was wrong with an INS as soon as he read the write up.

 

Tried to explain Earth Rate to me once...I just smiled and Nodded occasionally.

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Once again Heatblur thank you for an amazing update to the quality work going into the Tomcat. Will there be any F10 radio menu options to utilize the deck edge cable or SINS integration to CV INS alignment?

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