About The Cause Of The GPS Signal Attenuation
Principle: the GPS receiver receives the 1575.42 MHz microwave signal from thesatellite. Because the satellite launch power and distance, the signal of the same frequency background noise than 100 times smaller than the broadcast signal,now across your body a thousand times smaller. GPS handset use sophisticated technology to filter out really useful signal.
Signal penetration capability:
1 all metal entity will completely cover the GPS signal.
2 the thickness of 1 cm above the water can completely attenuated GPS signal to not available.
3 glass and plastic with mild attenuation of GPS signal, so you can put GPS inclothes pocket, or a car windshield, or insert his mobile phone sets.
4 but the non metal massive objects will completely block signal, a few centimeters of the wood will completely cover the GPS signal.
Microwave signal wavelength of 5 1575.42MHz is 19 cm, so in theory through thepore size (diameter) is larger than that of the metal net 19 centimeters, or ordinary metal lattice structure, such as transmission tower.
Effects of canopy of GPS signal:
Crown on the attenuation of GPS signals is mainly from:
Containing 1 leaves in water, and the water leaves the above (dew or rain). It can be inferred: effects on signal must be smaller than the conifer broadleaf trees.
The 2 tree branches dense degree.
The measured GPS under the tree precision definitely affected the above factors, effect size received all kinds of factors, need to test their GPS receiver for their own, so that the heart, because it is likely that when you are climbingtheir own small life over to the GPS.
Also, is the reflection of GPS signal: smooth metal surface will reflect the microwave signal, resulting in signal by more than one path to the GPS receiver,which affect the precision of GPS, this phenomenon is particularly evident in thecity.