GPS Global Positioning Systems
GPS devices communicate via a NMEA (National
Marine Electronic Association) spec which costs about 250ドル.
see also:
Suppliers:
-
Garmon produces a unit with integral antenna and serial NMEA output
-
Rockwell, Jupiter - 12 channel aith NMEA serial output
-
Trimble SK8
-
http://www.sigem.ca VERY affordable. The
entire receiver unit (12 sattelites!) costs about 135ドル in small quantities.
The wiring diagram is a builder's dream! Coax connector for antenna is soldered
on the board. Then there's a 10 pin header for power and data, and the data
is already formatted in NMEA 0183 format.
-
http://www.axiomnav.com/
Garmin GPS 16/17 to DB9 PC serial port
interconnect:
Here is a Javascript function to calculate distance in miles. Change the
multiplier to equal the number of your preferred units in one mile. For example,
to get results in feet the multiplier would be 5280.
function calcDist(lon1,lat1,lon2,lat2) {
var r = 3963.0;
var multiplier = 1;
return multiplier * r * Math.acos(Math.sin(lat1/57.2958) *
Math.sin(lat2/57.2958) + Math.cos(lat1/57.2958) *
Math.cos(lat2/57.2958) * Math.cos(lon2/57.2958 -
lon1/57.2958));
}:
See:
file: /Techref/io/sensor/pos/gps.htm,
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