DPergunta 7 1 pts You are driving through a dense redwood forest in California u
ID: 114028 • Letter: D
Question
DPergunta 7 1 pts You are driving through a dense redwood forest in California using a GPS unit to track your location and map your route. Why would you likely not be able to generate high-quality location data? O The GPS receiver cannot send a signal to GPS satellites through tree cover O Movement always increases error rates to between 50-75% Tree cover can interrupt satellite signals being sent to the GPS receiver O California is far from the Master Control Station at Colorado Springs, so errors are highExplanation / Answer
tree cover can interrupt signals being sent to GPS receiver
The effectiveness of a GPS signal is presented in decibels. By the time the signals have traveled the 22,200km from the GPS satellite to Earth's surface, the sign gets weaker as poor as -125dBm to -130dBm, even during clear open skies. In the city, developed urban environments or below forest cover, the signal can fall to as low as -150dBm. For the signal presentation the greater the negative value, the less strong the transmission if. At this low levels, some GPS devices would have difficulty in obtaining a working link but might be able to continue GPS tracking if a signal was initially acquired in the open environment.
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