The telemetry system of a geostationary communications satellite samples 150 sensors on the spacecraft in sequence. Each sample is transmitted to earth as 10 eight-bit words in a TDM frame. An additional 200 bits are added to the frame for synchronization and status information. The data are then transmitted at a rate of 2.0 kilobit per second using binary phase shift keying (BPSK) modulation of a low power carrier. a. How long does it take to send a complete set of samples to earth from
The telemetry system of a geostationary communications satellite samples 150 sensors on the spacecraft in sequence. Each sample is transmitted to earth as 10 eight-bit words in a TDM frame. An additional 200 bits are added to the frame for synchronization and status information. The data are then transmitted at a rate of 2.0 kilobit per second using binary phase shift keying (BPSK) modulation of a low power carrier. a. How long does it take to send a complete set of samples to earth from the satellite? b. Including the propagation delay, what is the longest time the earth station operator must wait between a change in a parameter occurring at the spacecraft and the new value of that parameter being received via the telemetry link? (Assume a path length of 37 000 km.)
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![Digital Modulation Scheme (Amplitude-Shift Keying [ASK], Phase-Shift Keying [PSK], Frequency-Shift Keying [FSK])](/static/compass_v2/subjects/engineering/electrical-engineering.svg)
