Question

a) Estimate the time in miliseconds taken for a signal to reach the Earth's surface from a GPS satellite knowing that the GPS satellite is at a distance of 21500 km and the radio signal travels at the speed of light which is 3x10 m/s with assuming that the speed of the signal is unchanged over the whole path length (5 marks) b) Calculate the power of the signal in watts per square meter on the surface of the Earth for a GPS transmitter at 20 000 km above the surface of the Earth and transmitting at 60 W. (5 marks) c) Eight computers are connected to a wireless network (AP) that offers a maximum data rate of 12Mbit/s and a throughput of 40%, what is the typical average practical message data rate available for each user in kilobits per second? (5 marks) Note: For the above numerical questions, show formula used and calculation details.

Answer 1

P6 21500 km Times Distana21500 x 1o3 3 x 108 키. millisec : 귀 milliseconds Transmilld Power (P) o w Eortl 20,ooo unit mㄴ R 20000 片 咩.TT x 4X10 Maximun data rate - 12 Mbits Sec. rcu Pachcal dada ra. for eig wstrk 12メ48 F 48 Mbit/see : 4.8 0 Mhi/se f0 Pratical daba rah per ustr : 06 x1000 kilo bik/se o 600 S &c