NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Paul Dolkas
Date: 2024 Aug 3, 18:13 +0000
Paul-
My understanding is that the system could pick up stars while sitting on the runway on a sunny day at noon.
- Paul
From: NavList@fer3.com <NavList@fer3.com>
Sent: Saturday, August 3, 2024 8:30 AM
To: Paul Dolkas <paul@dolkas.net>
Subject: [NavList] Re: Astro-inertial navigation
Re: Astro-inertial navigation
From: David Pike
Date: 2024 Aug 3, 06:39 -0700
Paul Hirose
Just a couple of questions:
1. Are/were the astro/inertial systems in the SR71 and the B2 only practical for flights above the tropopause, or are these systems able to receive starlight through cloud.
2. It’s interesting that you talk about reference positions. What about initial heading? I would have thought that in an otherwise perfect system the positional error due to an initial position error would increase relatively slowly whereas the positional
error due to an initial azimuth error would build up very quickly. I have seen test plots from experimental GNSS/inertial indoor navigation systems (or maybe they were simulations) where a small azimuth error causes position (e.g. when walking along corridors)
to become unuseable very quickly. DaveP
