GPS Comparisons Auto
Why have an electronic compass?
A GPS receiver discerns your position on the surface of the earth by measuring the length of time it takes to receive signals from satellites. It cannot, however, tell what direction you are facing while standing still (or moving slowly). So if you are navigating to a waypoint, your GPS can only point you in the correct direction once you are moving. This is where an electronic compass comes in handy. It can tell what direction you are facing, even while standing still.
What type of altitude input is required for TAWS?
Most TAWS installations require only uncorrected barometric pressure altitude information from an existing encoding altimeter. This altitude information is combined together with the altitude dervied from the connected GPS to provide accurate altitude information. This combination of pressure altitude and GPS altitude is called “Geometric Altitude” which is less susceptible to errors or malfunctions from normal altimeter systems.Most TAWS installations require only uncorrected barometric pressure altitude information from an existing encoding altimeter. This altitude information is combined together with the altitude dervied from the connected GPS to provide accurate altitude information. This combination of pressure altitude and GPS altitude is called “Geometric Altitude” which is less susceptible to errors or malfunctions from normal altimeter systems.
Why is there an Abrupt Elevation Change?
During that time you experienced your max Uphill Grade, Max Ascent and Descent Rate. You finished your activity at the same place you started, but the elevation profile shows you finishing over 200 feet higher than where you started. Your altimeter was auto-calibrating using the GPS information as a reality check to correct the change in barometric pressure since last calibration. I love this feature, but it is causing some headaches.Now that SA (Selective Availability) has been turned off, the general answer to this is Yes. GPS altitude is at least as accurate as the reading from a barometric altimeter. However, to determine altitude a GPS MUST be receiving information from at least three satellites and the more it is tracking, the better. If you want more information on this subject, there have been NUMEROUS postings on the rec.aviation.soaring and sci.geo.satellite-nav newsgroups.
How accurate are the heights or depths?
The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode.During that time you experienced your max Uphill Grade, Max Ascent and Descent Rate.
How accurate are the heights or depths?
The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode.The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode.
How much power do the TX-units use?
Depending on the mAh rating of the batteries you use, and the update frequency you select you will get different run times. As well, the radio can be put into ’serial sleep’ mode which lowers its power consumption when not transmitting down to 5 ma. Setting the Radio to ’serial sleep’ does help conserve battery power for applications where the update time is 10 seconds or more. The following examples assume and update frequency of 1 second.The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication). Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode.Now that SA (Selective Availability) has been turned off, the general answer to this is Yes. GPS altitude is at least as accurate as the reading from a barometric altimeter.
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