Inertial Navigation Flashcards
INS do (not) require external input to compute position
not
With ___ from the ADC, they can calculate wind velocity
TAS
INS can work ___ and are (not) undetectable
anyway, they are
They can apply local variation between __N and __S from a table in the database, meaning a flux detector is not required
73 65
If the variation table cannot update the output from true to magnetic, then the set might show either ___ ___ or switch to ___
HDG FAIL TRUE
The difference between WGS84 and the oblique spheroid of the Earth is why ___ ___ is required
Schuler Tuning
Outline the general principle of Inertial Navigation
- Start from a known position
- Calculate present position from directions and speed since then.
The drift should be around _nm per hour for a strapdown system
1
The drift could be _nm per hour for a stable platform
3
The main cause of cumulative distance errors come from wander in the ___ ___ and ___ ___ in the second stage of integration
levelling gyros, integration errors
The accuracy of any computed altitude decreases ___ with time
exponentially
As the accuracy degrades over time, supplementation with ___/___ is required, where it becomes subject to bound errors based on the other system
GPS/navaids
As the system error keeps growing, it is ___, and readings will be inaccurate to some extent
unbounded
The position will be most inaccurate at the top of ___, and just after ___
descent take off
Map shift occurs when the ___
moving map changes position to show the updates
