Originally Posted by bcn
Some modern do combine both - to get the best from the two worlds:
- high precision and bandwidth from gyros and accelerometers
- no drift and precise timing from GPS
| Coda Products
aplications (from the manufacturer of the Coda stuff):
If you will notice in the descriptions, they refer to it as an inertial navigation
system aided by GPS
. An inertial navigation
system does not use a GPS. However, systems that combine inertial navigation with a GPS are very common.
In the case of the marine
applications, I can see that because it is under water
, it can't use the GPS. Through a wire, it CAN use the timing signal of the GPS. SO, even though it is using a GPS for timing, it is not using it for position. So, I can see calling it an inertial navigation with out qualifying that is also uses GPS. This situation had not occurred to me. But again, I would not refer to this a an inertial nav system with GPS, because most people would assume it means the system is using the position from the GPS as well as the timing.
Basically, the very definition of an inertial navigation system precludes it from using a GPS for position. It uses inertia. Accelerometers and gyros.
But there is absolutely nothing keeping people from combining all the different technologies into a piece of equipment
they want to. As they do, sometimes they start getting sloppy with what technology the refer to it as. It gets sloppy.
So, they refer to AIS Radar
, when more accurately it is a Radar
Sorry, you have been posting
excellent information. I was just getting picky about the definition of inertial navigation.