Satellite communication important questions

SPACE SEGMENT AND LINK DESIGN 1. Give the two segments of basic satellite communication. a. Earth segment (or) ground segment b. Space segment 2. Write short notes on attitude control system. It is the system that achieves and maintains the required attitudes. The main functions of attitude control system include maintaining accurate satellite position throughout the life span of the system. 3. What is declination? The angle of tilt is often referred to as the declination which must not be confused with the magnetic declination used in correcting compass readings. 4. What is meant by payload? It refers to the equipment used to provide the service for which the satellite has been launched. 5. What is meant by transponder? In a communication satellite, the equipment which provides the connecting link between the satellite’s transmit and receive antennas is referred to as the transponder. 6. Write short notes on station keeping. It is the process of maintenance of satellite’s attitude against different factors that can cause drift with time. Satellites need to have their orbits adjusted from time to time, because the satellite is initially placed in the correct orbit, natural forces induce a progressive drift. 7. What is meant by Pitch angle? Movement of a spacecraft about an axis which is perpendicular to its longitudinal axis. It is the degree of elevation or depression. 8. What is an propellant? A solid or liquid substance burnt in a rocket for the purpose of producing thr...

• Solutions Overview • Satellite Voice • Mobile Satellite / BGAN • Vehicular Network • Future Solutions • Satellite Basics & FAQ • About Us & Firstnet • Why Choose Satellite • How Do I Purchase • Learn About Our Solutions • Solutions Overview • Satellite Voice • Mobile Satellite / BGAN • Vehicular Network • Future Solutions • Satellite Basics & FAQ • About Us & Firstnet Satellite Communications Technology 101 Why is satellite an essential component of critical communication network planning? Satellite communications (SATCOM) have been a trusted, reliable choice for public safety agencies’ mission-critical communication needs for nearly half a century. Unlike traditional wireline or cellular wireless systems, SATCOM uses satellites to “bounce” voice or data signals to or from a remote user through the sky and back to one or more geographically redundant downlink facilities (“earth stations”), which are connected to the global communications backbone networks. This enables communications virtually anywhere, as users have a “line-of-sight” path through the air to the satellite. Without satellite, any disaster response/COOP plan is at risk of falling apart when the traditional terrestrial and cellular networks sustain damage or get overloaded. How Easy Is SATCOM To Use? SATCOM services are as easy to use as a cellular phone. For example, anyone with experience making cellular phone calls can use today’s satellite phone. There are no special dialing prefixes or limitations on w...

SATELLITE ACCESS 1. What is a single mode of operation? A transponder channel abroad a satellite may be fully loaded by a single transmission from an earth station. This is referred to as a single access mode of operation. 2. What are the methods of multiple access techniques? FDMA – Frequency Division Multiple Access Techniques TDMA – Time Division Multiple Access Techniques 3. What is an CDMA? CDMA – Code Division Multiple Access Techniques In this method, each signal is associated with a particular code that is used to spread the signal in frequency and time. 4. Give the types of CDMA. • Spread spectrum multiple access • Pulse address multiple access 5. What is SCPC? SCPC means Single Channel Per Carrier. In a thin route circuit, a transponder channel (36 MHz) may be occupied by a number of single carriers, each associated with its own voice circuit. 6. What is a thin route service? SCPC systems are widely used on lightly loaded routes, this type of service being referred to as a thin route service. 7. What is an important feature of Intelsat SCPC system? The system is that each channel is voice activated. This means that on a two way telephone conversation only one carriers is operative at any one time. 8. What is an TDMA? What are the advantages? TDMA – Time Division Multiple Access Techniques Only one carrier uses the transponder at any one time, and therefore Inter modulation products, which results from the non-linear amplification of multiple carriers are absent. ...