Fundamental theory of VSAT communications for all VSAT technicians and engineers. Includes advanced interactive graphical simulations.
GVF520, the second in a series of three online courses leading to GVF Advanced Satcom Professional Certification, provides the student with a thorough understanding of the fundamental theories of VSAT communications. This knowledge is essential for every skilled and effective satellite ground equipment terminal field technician.
Audience:The course is appropriate for all installers and field technicians who may be responsible for activating any type of VSAT terminal, as well as engineers and technicians desiring a technical introduction to two-way satellite communications.
Tests:Each lesson contains a mandatory quiz and simulator-based skills assessments. All pages must be viewed and all quizzes and simulator tests must be passed in order to satisfactorily complete the course.
- General understanding satellite communications theory at a technician level;
- Compare satellite, wireless, wired, and fiber communications and their preferred applications;
- Describe spacecraft physical size, payloads, transponders, antennas, lifetime;
- Describe typical launch vehicles;
- Compare LEO, MEO, and GEO orbits;
- Identify GEO arc as viewed from the earth and space;
- Describe the concepts of links, link budgets, and how they are affected by dish size;
- Define qualitatively EIRP, G/T, footprints, and contours ;
- Describe the main properties of microwaves and how signals are affected by blockage;
- List the frequencies bands used for satellite communications;
- Define rain fade loss, rain zones, availability;
- Explain solar outages;
- Describe the operation of a satellite transponder.
- Compare co- and cross-pol transponders.
- Define linear polarization, polarization angle, cross-pol alignment and interference, pol re-use, and circular polarization.
- Identify the main hardware components in a VSAT and a larger earth station.
- Define the functions of the antenna, LNB, TRF, BUC, IFL, OMT, waveguide, and modem.
- Compare the main types of antennas used for earth stations.
- Describe sidelobes and beamwidth.
- Describe the relationships between antenna size, frequency band, beamwidth, and gain.
- Describe the how inclined orbit satellites affect ground antennas.
- Define amplitude, frequency, decibels, gain, EIRP, spectrum, symbol rate, bandwidth, noise, power, C/N, and Eb/No.
- Define modulation and demodulation. Describe and compare BPSK, QPSK, and 8PSK.
- Define and describe SCPC, TDM, TDMA, MF-TDMA, DVB, DVB-RCS, star, and mesh networks.
- Describe the functions of a LAN, Ethernet, IP address, subnet, gateway/router address, DNS, DHCP, NAT.
- Define the functions of nonroutable addresses, ping, and tracert.
- Identify and compare auto-point and stabilized antennas.
- Describe the process of automatic acquisition in an auto-point antenna.