Other GPS Systems GPS Tracker Rental Miami Coral Gables
GPS Tracker Rental Miami Coral Gables There are other similar systems to GPS in the world, which are all classified as the Global Navigation Satellite System (GNSS). GLONASS is a satellite constellation system built by Russia. GPS Tracker Rental Miami Coral Gables The European Space Agency is creating Galileo, while China is creating BeiDou. Most Garmin receivers track both GLONASS and GPS, and some even track BeiDou. GPS Tracker Rental Miami Coral Gables You can expect a more reliable solution when you track more satellites. GPS Tracker Rental Miami Coral Gables You could be tracking nearly 20 with newer Garmin products. GPS Tracker Rental Miami Coral Gables
The GPS Satellite System GPS Tracker Rental Miami Coral Gables
GPS Tracker Rental Miami Coral Gables The 31 satellites that currently make up the GPS space segment are orbiting the earth about 12,000 miles above us. GPS Tracker Rental Miami Coral Gables These satellites are constantly moving, making two complete orbits in less than 24 hours. GPS Tracker Rental Miami Coral Gables They travel at speeds of roughly 7,000 miles an hour. Small rocket boosters keep each satellite GPS Tracker Rental Miami Coral Gables flying on the correct path. GPS Tracker Rental Miami Coral Gables
Here are some other interesting facts about the GPS satellites: GPS Tracker Rental Miami Coral Gables
• The official USDOD name for GPS is NAVSTAR GPS Tracker Rental Miami Coral Gables
• The first GPS satellite was launched in 1978. GPS Tracker Rental Miami Coral Gables
• A full constellation of 24 satellites was achieved in 1994. GPS Tracker Rental Miami Coral Gables
• Each satellite is built to last about 10 years. Replacements are constantly being built and launched into orbit. GPS Tracker Rental Miami Coral Gables
• A GPS satellite weighs approximately 2,000 pounds and is about 17 feet across with the solar panels extended. GPS Tracker Rental Miami Coral Gables
• GPS satellites are powered by solar energy, but they have backup batteries onboard, in case of a solar eclipse. GPS Tracker Rental Miami Coral Gables
• Transmitter power is only 50 Watts or less. GPS Tracker Rental Miami Coral Gables
What's the signal? GPS Tracker Rental Miami Coral Gables
GPS satellites transmit at least 2 low-power radio signals. The signals travel by line of sight, meaning they will pass through clouds, glass and plastic but will not go through most solid objects, such as buildings and mountains. GPS Tracker Rental Miami Coral Gables However, modern receivers are more sensitive and can usually track through houses. GPS Tracker Rental Miami Coral Gables
A GPS signal contains 3 different types of information: GPS Tracker Rental Miami Coral Gables
• Pseudorandom code GPS Tracker Rental Miami Coral Gables is an I.D. code that identifies which satellite is transmitting information. GPS Tracker Rental Miami Coral Gables You can see which satellites you are getting signals from on your device's satellite page. GPS Tracker Rental Miami Coral Gables
• Ephemeris data GPS Tracker Rental Miami Coral Gables is needed to determine a satellite's position and gives important information about the health of a satellite, current date and time. GPS Tracker Rental Miami Coral Gables
• Almanac data GPS Tracker Rental Miami Coral Gables tells the GPS receiver where each GPS satellite should be at any time throughout the day and shows the orbital information for that satellite and every other satellite in the system. GPS Tracker Rental Miami Coral Gables
GPS Signal Errors Sources GPS Tracker Rental Miami Coral Gables
Factors that can affect GPS signal and accuracy include the following:
• Ionosphere and troposphere delays: Satellite signals slow as they pass through the atmosphere. GPS Tracker Rental Miami Coral Gables The GPS system uses a built-in model to partially correct for this type of error. GPS Tracker Rental Miami Coral Gables
• Signal multipath: The GPS signal may reflect off objects such as tall buildings or large rock surfaces before it reaches the receiver, which will increase the travel time of the signal and cause errors. GPS Tracker Rental Miami Coral Gables
• Receiver clock errors: A receiver's built-in clock may have slight timing errors because it is less accurate than the atomic clocks on GPS satellites. GPS Tracker Rental Miami Coral Gables
• Orbital errors: The satellite's reported location may not be accurate. GPS Tracker Rental Miami Coral Gables
• Number of satellites visible: The more satellites a GPS receiver can "see," the better the accuracy. When a signal is blocked, you may get position errors or possibly no position reading at all. GPS Tracker Rental Miami Coral Gables GPS units typically will not work underwater or underground, but new high-sensitivity receivers are able to track some signals when inside buildings or under tree-cover. GPS Tracker Rental Miami Coral Gables
• Satellite geometry/shading: Satellite signals are more effective when satellites are located at wide angles relative to each other, rather than in a line or tight grouping. GPS Tracker Rental Miami Coral Gables
• Selective availability: The U.S. Department of Defense once applied Selective Availability (SA) to satellites, making signals less accurate in order to keep 'enemies' from using highly accurate GPS signals. GPS Tracker Rental Miami Coral Gables The government turned off SA in May of 2000, which improved the accuracy of civilian GPS receivers. GPS Tracker Rental Miami Coral Gables
GPS Tracker Rental Miami Coral Gables
