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Microsatellite (Bus (Service Module) (Tracking, telemetry, command and…
Microsatellite
Bus (Service Module)
Tracking, telemetry, command and ranginf (TTC&R)
Solar panels
Batteries
Reaction control system (Propulsion)
Attitude and spacecraft control processing (Orbit control)
Thermal control and structure
Payload (Communication Module)
Repeater (receivers, multiplexers, amplifiers, processing and switching)
Analog Repeater
Bent pipe (no change in format; uplink and downlink noise combine)
Standard design for FSS and BSS statellites
Simple design, simple operation
very flexible
Network optimization limited
Coverage is defined by the antenna gain pattern
Supports any modulation and multiple access
Limited routing capability
Excellent dynamic range; impairments can aggregate
Digital Processing Repeater
Channel routing or packet switching
Tailored to multiple access (and modulation)
Separates uplink from downlink
Excellent routing (and switching) capability
Limited dynamic range
Need for flexible payload architecture
channel routing
on-demand reconfiguration
Demod/remod performance
Beam forming, multiple and flexible
Constraints
Signal structure (multiplex, modulation and multiple access
Bandwith
Processor speed and complexity
Power and weight
Impairments
Dynamic range
Antennas (reflectors, feeds, feed networks, support structure and pointing mechanisms)