![]() If you are located on the equator and are communicating with a satellite directly overhead then the total distance, single hop (up and down) is nearly 72,000 ![]() Radio waves go at the speed of light which is 300,000 km per second. The time for one satellite orbit and the time for the earth to rotate is 1 sidereal day or 23 h 56 m 4 seconds. Height the satellites go around the earth in a west to east direction at the same angular speed at the earth's rotation, so they appear to be almost fixed in Most communications satellites are located in the Geostationary Orbit (GSO) at an altitude of approximately 35,786 km above the equator. However, this example plots it only for the first satellite to serve as a demonstration and to reduce plot clutter.Geostationary satellite latency and time delay ms You may choose to plot the latency corresponding to all satellites. Plot the latency corresponding to the first satellite. % Set the latency and doppler velocity to NaN whenever access status is % false because these quantities are irrelevant when there is no access. ![]() Re-format this velocity such that the first dimension % corresponds to the satellite. This velocity determines the doppler frequency corresponding % to each satellite. % Calculate the velocity along the line between the ground station and each % satellite. You can use permute to re-format the arrays as described.ĭir = cat(1,permute(cosd(el).*cosd(az),). To do this, az and el must also be re-formatted such that the % first dimension, which represents the satellite becomes the third % dimension. Therefore, compute the direction also as a 3-dimensional % array, wherein the first dimension has a size of 1, the second dimension % represents the time sample, and the third dimension corresponds to the % satellite. satV is a 3-dimensional array, % wherein the first dimension represents the cartesian component, second % dimension represents the time sample, and third dimension represents the % satellite. ![]() % Calculate the direction of the ground station with respect to each % satellite in its respective NED frame. = states(sat,CoordinateFrame= "geographic") Therefore, the relative % velocity with respect to the ground station is also the same. ![]() Physically, this is the ECEF velocity, % represented in NED frame of the satellite. % Calculate the velocity of each satellite in its respective % North/East/Down (NED) frame. % Calculate azimuth, elevation, and range from each satellite to the ground % station. ![]()
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