<<EGPWS - GPS based?
Actually, I am still trying to figure out whether GPS is a requirement or not. It is
not necessary, because Allied Signals EGPWS has been tested with INS.>>
Arun, please correct me if I am wrong, but GPS is not a necessity for the solution. EGPWS is nothing more than an algorithm that compares aircraft position, altitude, velocity and performance characteristics to a very detailed terrain map. The system will detect when the aircraft is being vectored toward the terrain, and will give warning in sufficient time to allow the pilot to gain separation within the aircraft's performance parameters.
As far as I know, the algorithms that have been developed utilize the host navigation system (INS, Doppler, GPS, etc). GPS is becoming more common as an integral part of modern aircraft, but it is not a requirement for EGPWS.
So who wins with EGPWS? Don't know the answer to this one. There are many, many companies out there developing these high tech solutions for safety. Yes, GPS solutions will provide greater redundancy/accuracy so makers of hardware and software will benefit. Companies that provide extremely detailed and up-to-date terrain maps will benefit. Finally, companies that make Mega Data Transfer Cartridges (provides the ability to access the "terrain database" around your route of flight) will benefit.
There are many companies involved due to the size of the future market. According to Janes, a 1992 study cited that US Air Force controlled flight into terrain would be reduced by more than 50 percent using an EGPWS algorithm.
I am basing my analysis on a passive system. How many competitors out there base their system on an active source such as radar? How accurate are they in relation to something like a radio tower perched on top of a ridge?
Thanks.
Boda |
