Lab4_McGovern

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Date used: 2/1/2024 Lab 4 Question 4.1 How many GNSS satellites were being tracked by Navmatix GNSS Mission Planning on the date selected? How many of them were considered unhealthy? On February 1 st 2024 Navmatix was tracking 138 GNSS satellites, of the 138 being tracked 20 of them were considered unhealthy Question 4.2 How many Galileo satellites were active and healthy on the date selected? On February 1 st 2024 Galileo had 20 Active satellites, of which 18 of them were healthy. Question 4.3 How many BeiDou satellites were active and healthy on the date selected? On February 1 st 2024 BeiDou had 45 Active satellites, of which 44 of them were healthy. Question 4.4 At what specific times of day are the maximum number of GPS satellites visible for your selected date? What is this maximum number? The Maximum number of Satellites visible was 13 across the entire day, it was 13 between 8:00 pm to 8:20 pm, 11:40 pm to 11:50 pm, 7:20 am, and 5:00 pm to 5:10 pm. At all these intervals of time within the 24 hours, there were 13 visible satellites which is the maximum number. Question 4.5 At what specific times of day are the minimum number of GPS satellites visible for your selected date? What is this minimum number? The minimum number of satellites visible is 8 across the entire day. It was at 8 during the times of 3:10 am, 8:50 am to 9:30 am, 10:20 am, and 11:30 am. Question 4.6 Which satellites are visible from Orlando at 6 a.m. on the selected date? The satellites visible from Orlando at 6 a.m. on February 1 st 2024 are G02, G10, G12, G21, G23, G25, G26, G28, G31, and G32. Question 4.7 Which satellites are visible from Orlando at 12:00 p.m. on the selected date? The satellites visible from Orlando at 12 p.m. on February 1 st 2024 are G04, G07, G08, G09, G16, G21, G26, and G31 Question 4.8 At 6 a.m. on the selected date, which three satellites are closest to the center position? At 6 a.m. on February 1 st 2024 the three closest satellites to the center position are G15 which is practically centered, G29, and G13 Question 4.9 At 12 p.m. on the selected date, which four satellites are closest to the center position?

At 12 p.m. on February 1 st 2024 the four satellites closest to the center position are G28, G32, G31, and G10 Question 4.10 At what time(s) of day on the selected date is the maximum value for geometric DOP (GDOP) encountered? What is this maximum value? Between the times of 9:00 a.m. and 9:10 a.m. the maximum value for geometric DOP is encountered, that value is 2.38. Question 4.11 At what time(s) of day on the selected date is the minimum value for GDOP encountered? What is this minimum DOP value? At 7:20 a.m. the minimum value for GDOP is encountered, that value is 1.21. Question 4.12 Just based on the number of visible satellites and the ionospheric and DOP calculations, what would be the “best” (i.e., peak) time range during which to perform GPS field measurements in Orlando on the selected date, and why? Based on the data I collected I think around the times of 6-7:20 am, specifically 7:20 am would be the best time range to perform GPS field measurements. At this time there is the peak of satellite visibility with 13 of them visible, with G15 being closest around 6 am and G18 around 7:20. Additionally at 7:20 am this is the time when the DOP is closest to 1 at 1.21. Question 4.13 Just based on a number of visible satellites and the ionospheric and DOP calculations, what would be the “worst” time range during which to perform GPS field measurements in Orlando on the selected date, and why? Based on the data collected the worst time to perform GPS Field measurements would be around 9:00 am. This would be the worst time due to several factors, one being this time is when the minimum number of satellites are visible that being only 8, and at this time the DOP is also above 2 being at 2.38 which is the highest value recorded on February 1 st 2024.

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