Summary
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Theory and practice for analyzing point-to-point RF and microwave links and links through bent-pipe satellites.
Description
A classic link budget is an analysis of the strength of a signal as it passes through a radio, microwave, or satellite link, as well as the noise generated within the link. The result of the analysis will determine if the link can deliver an error-free (or almost error free) connection.
In this course, you will learn how to analyse both simple point-to-point (single-segment) links and links through satellites with "bent pipe" transponders (dual-segment). We will explain all the equations so you will be able to make your own link analyses by hand, but you can use the included simulators to do all the calculations for you.
Included with the course are a 16-page Quick Reference Guide, containing all formulas and constants, plus access to the SatProf Toolkit desktop app which contains RF calculators and single- and dual-segment link budget simulators.
Audience:
This course is recommended for engineers who are planning satellite or microwave links or wish to gain a deeper understanding of commercial link budget software data and results.
Prerequisites:
The following courses are recommended (unless you already have equivalent knowledge): GVF 505 (RF and DC Theory for Satellite Systems, GVF 520 (Satcom Fundamentals), and SBQ403 (Space Communications Fundamentals).
Delivery:
Animated & interactive HTML5, self-paced, on-line format. Requirements: internet access while studying the course material (high speed preferred ); current browser with JavaScript enabled; permission to access SatProf server and learning system websites; mouse.
Tests:
Each lesson contains a mandatory quiz. All pages must be viewed and all quizzes must be passed in order to satisfactorily complete the course. Some lessons also contain Skills Tests using link simulators which you must also pass.Lessons
- Introduction
- Noise and Signals
- Transmission
- Ground Systems Fundamentals
- Predicting Single-Segment Links
- Transponder and Satellite Architectures
- Bent Pipe Transponder Behavior
- Closein GEO Dual-Segment Links
- Advanced Topics
Learning Objectives
- Introduction to link analysis.
- Noise and signals: the math decibels, gain, power, and noise.
- Transmission fundamentals: bits, symbols, modulation, coding, and Shannon's limit
- Ground systems: frequency, wavelength, antennas and antenna noise, G/T, EIRP, and amplifier sizing.
- Single-segment links: the math for calculating the signal and noise at the receiving end of a simple point-to-point link. Rain fade, uplink power control, variable bit rate and adaptive coding, and using the Single-Segment Analysis Tool.
- Transponder and satellite architectures.
- Bent-pipe transponders: how they work and what their performance parameters mean.
- Consider LEO and MEO link issues.
- Closing GEO dual-segment links. You will put all the knowledge from the previous lessons together and calculate a complete link from an uplink station, through a satellite, and back down.
- Additional technical and regulatory constraints that must be met for real-world satellite links.