6. Communications
authored by Dr. Zhu with major contributions from Dr. Daniel Selva of Texas A&M
Learning Objectives
- Understand the role of the telecommunications subsystem in the context of spacecraft as a whole and between other subsystems
- Calculate the equations of transmission and reception as a function of spacecraft parameters
- Review different modulation schema, technologies, and constraints
- Produce a link budget
Communications Chapter Content
Learning Objectives
Definition
6.1 Subsystem Responsibilities
6.2 General Design Process
6.3 Typical Requirements and Design Considerations
-
- Artemis Requirements
- Suggested Activity
6.4 General Arrangement and Design Drivers
6.5 Fundamentals in Signals
-
- Analog/Digital Signals
- Quantization
- Sampling
- Aliasing
- Nyquist Theorem
- Coding
- Source Coding
- Channel Coding
- Modulations
- Amplitude Modulation (AM)
- Frequency Modulation (FM)
- Phase Modulation
- Digital Modulation
- Quadrature Amplitude Modulation
- Digital vs. Analog Modulation
- Polarization
- Bit Error Rate (BER)
- Analog/Digital Signals
6.6 Link Budget
-
- Antenna Gain
- Equivalent Isotropic Radiated Power
- Free Space Losses
- Frequency Selection
- Noise
- Signal Noise
- System Noise
- Environmental Noise
- Link Margin
6.7 Technologies
-
- Antennas
- Diplexer
6.8 Communications Analysis and Link Budget
-
- Suggested Activity
- Appendix: Optical Communications
- Optical Modulation
- Detection
- Noise in Optical Communications
- Optical Link Budgets
