Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
en:hardware:gnss [2018/08/08 21:07]
gerbold [Using GALILEO]
en:hardware:gnss [2022/06/09 07:28] (current)
Line 1: Line 1:
 ====== GNSS (GPS) ====== ====== GNSS (GPS) ======
 +original source(([[http://​en.blitzortung.org/​Compendium/​Documentations/​Documentation_2014-05-11_Red_PCB_10.4_PCB_12.3_PCB_13.1_PCB_14.1.pdf|Documentation System RED]], chapter 5.4))
  
 ===== Description ===== ===== Description =====
Line 31: Line 32:
 constellation will be almost the same. The most important values are listed here: constellation will be almost the same. The most important values are listed here:
  
-  * The signals of **tracked satellites** are used to calculate position and time data. The count of +  * The signals of **tracked satellites** are used to calculate position and time data. The count of tracked satellites shouldn’t fall below 6 too often. A value of four is the absolutely minimum! Higher values are always better.
-tracked satellites shouldn’t fall below 6 too often. A value of four is the absolutely minimum! +
-Higher values are always better.+
  
-  * **Satellites in view** gives the number of satellites, which could be tracked under perfect conditions +  * **Satellites in view** gives the number of satellites, which could be tracked under perfect conditions (i.e. on a airplane). The number of tracked satellites should be close to the number of satellites in view. >>>​For example, when you have 15 satellites view and only 4 tracked, then you should search a better place for the antenna.
-(i.e. on a airplane). The number of tracked satellites should be close to the number of +
-satellites in view. For example, when you have 15 satellites view and only 4 tracked, then you +
-should search a better place for the antenna.+
  
-  * **PDOP** stands for position dilution of precision. There are also values for vertical and horizontal +  * **PDOP** stands for position dilution of precision. There are also values for vertical and horizontal position (VDOP, HDOP). The DOPs give the best estimation about the "​GPS-quality"​. The lower the values, the >>>​better the position accuracy. Values below 1.0 are almost perfect and those below 3.0 are still far good enough for our purposes. The DOPs give a idea whether the constellation of tracked satellites is good. For example, even if you receive 8 satellites your PDOP could be bigger that 7 (very bad), because the GPS sees only satellites from a part of the sky and cannot calculate a good position.
-position (VDOP, HDOP). The DOPs give the best estimation about the "​GPS-quality"​. The +
-lower the values, the better the position accuracy. Values below 1.0 are almost perfect and +
-those below 3.0 are still far good enough for our purposes. The DOPs give a idea whether the +
-constellation of tracked satellites is good. For example, even if you receive 8 satellites your +
-PDOP could be bigger that 7 (very bad), because the GPS sees only satellites from a part of the +
-sky and cannot calculate a good position.+
  
 ===== Using GALILEO ===== ===== Using GALILEO =====
  
 FIXME add content FIXME add content