Table of Contents
- 1 Can GPS read altitude?
- 2 How is location determined using GPS?
- 3 How many satellites does it take to determine location and altitude?
- 4 How does a GPS determine its location quizlet?
- 5 What are the two things a GPS receiver needs to know to determine where it is on the earth?
- 6 How does a GPS receiver know where a GPS satellite is quizlet?
Can GPS read altitude?
GPS units have the capability of knowing whether they have enough reference satellite fixes to provide an accurate MSL altitude fix – within about 15 feet. GPS is not affected by changes in atmospheric pressure.
How is location determined using GPS?
A GPS receiver determines its own location by measuring the time it takes for a signal to arrive at its location from at least four satellites. Because radio waves travel at a constant speed, the receiver can use the time measurements to calculate its distance from each satellite.
How accurate is GPS elevation data?
It is true that GPS elevations are less accurate than the horizontal positions gained from GPS. In fact, GPS elevations generally have two to three times the error of horizontal positions gained from GPS. Even so, there is a tremendous value to the elevations provided by precise, carrier-phase GPS observations.
What altitude do GPS satellites orbit?
20,200 km
GPS satellites fly in circular orbits at an altitude of 10,900 nautical miles (20,200 km) and with a period of 12 hours.
How many satellites does it take to determine location and altitude?
An atomic clock synchronized to GPS is required in order to compute ranges from these three signals. However, by taking a measurement from a fourth satellite, the receiver avoids the need for an atomic clock. Thus, the receiver uses four satellites to compute latitude, longitude, altitude, and time.
How does a GPS determine its location quizlet?
GPS receivers use triangulation with the data from three satellites to determine a precise two-dimensional location. With at least four satellites in view and operational, three-dimensional location data can be obtained.
How high up are GPS satellites?
GPS satellites fly in circular orbits at an altitude of 10,900 nautical miles (20,200 km) and with a period of 12 hours.
How does a GPS receiver determine from which satellites it is receiving the signal?
GPS uses a lot of complex technology, but the concept is simple. The GPS receiver gets a signal from each GPS satellite. The satellites transmit the exact time the signals are sent. By subtracting the time the signal was transmitted from the time it was received, the GPS can tell how far it is from each satellite.
What are the two things a GPS receiver needs to know to determine where it is on the earth?
In order to make this calculation, every GPS receiver must know the following things: 1. The location of at least four GPS satellites above it and; 2. The distance between the receiver and each of those GPS satellites.
How does a GPS receiver know where a GPS satellite is quizlet?
Most receivers have several channels that are tuned to receive the civilian GPs frequency. Although all channels are tuned to the same frequency, a single channel can track a GPS satellite by locking onto its PRN code.