----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Hi,
In order to get artificial horizon data from the GPS, you must have an antenna on each wing and at least one on the fuselage. The GPS will calculate the differential time of the arrival of the signal (pseudo range) and knowing the position of the satellite, can calculate the angles of the triangle between the three or more antennas, thereby giving attitude data. The military has been using it for some time for weapons system guidance, and for certain commercial applications such as aerial surveying where it is important to know the pointing vector of the camera. , To my knowledge, it has not been implemented in general aviation GPS as yet.. The thinking is that the gyros that we use now are about as accurate as the gps information EXCEPT. In certain applications a unit using two inputs, GPS and gyro information are combined. The gyro is great for short term accuracy and the GPS resets the long term drift errors to keep the gyros accurate. A few years ago there was talk about using GPS for auto pilot use but to my knowledge, nothing was done about it. Portable GPS unit will probably never be certified because of the number of antennas involved. Stay tuned.
Bill Coons APC
Garmin GPS rep for J.A. Air Center
Wood-Thomas wrote:
----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Can any parachute for aircraft (BSR) be fitted to the coupe? legally or illegally?When a portable moving map display can show an artificial horizon, where is it getting it's information? I'm assuming the device must also be fixed to the aircraft?Cyrus
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