LAB 3, Mahin Ahmed, 42123224.pdf

LAB 3, Mahin Ahmed, 42123224.pdf - Name Mahin Ahmed Student...

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Name: Mahin Ahmed Student ID: 42123224 Date: 06/02/1029 Lab 3: Global Positioning Systems Q1. What is a satellite’s almanac? Why is it important for a GPS receiver to be able to read a satellite’s almanac? What is the difference between a satellite’s almanac and its ephemeris? Almanac is a type of data that is transmitted by GPS satellites. It includes information about the health of the entire GPS satellite constellation and coarse data on every satellite's orbit. It is important for a GPS server to be able to read a satellite s almanac because when the GPS receiver has our current almanac data in its memory, it can acquire signals and determine positions more quickly. The difference between the ephemerides and the almanac are: Ephemerides Almanac contains information on week number, satellite accuracy and health, age of data, satellite clock correction coefficients, orbital parameters assists the receiver in determining which satellites to search for; contains less accurate orbital information than ephemerides valid for 2 hours valid for up to 90 days different for each satellite same across the system Q2. Click on a healthy and an unhealthy satellite and compare their almanac details. What’s different about their Time of Almanac values? The values for Time of almanac are different for both a healthy almanac and an unhealthy almanac. The unhealthy almanac is behind in time than a healthy almanac. Q3. At which time of day are the most satellites visible? The least? From which GNSS missions are the most satellites visible throughout the day? Why might this be?
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Most satellites are visible at 5:00. (29) Least satellites are visible at 9:30 . (15).
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  • Spring '16
  • Carroll
  • Global Positioning System, satellite’s almanac

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