Modular Satellite Transponder Digital Channelization
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Solution Overview
Problem
Current satellite transponders face limitations in flexible bandwidth management and switching capabilities, particularly in processing and routing communications data across diverse frequency bands, which restricts their efficiency in handling multiple uplink and downlink beams.
Innovation Solution
The proposed solution involves a modular transponder architecture with an analog front end, digital channelizers, switches, and combiners, which convert analog inputs to digital signals, process them into frequency slices, route and reassemble these slices, and convert them back to analog outputs, enabling flexible bandwidth management and routing through a multiple stage switch network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If analog transponders are used with point-to-point mapping of entire uplink antenna beams to particular downlink antenna beams, then the system structure is simple, but the bandwidth management flexibility and switching capabilities are limited
Solution Approach 1:
The transponder is divided into multiple transponder slices, each capable of independent operation. Each slice includes its own digital channelizer, digital switch, and digital combiner, allowing independent bandwidth management and switching operations. This segmentation enables flexible routing of different frequency slices through different paths while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent replaces analog switching mechanisms with digital switching. Digital transponders use digital signal processing and digital switches instead of analog beam mapping, enabling flexible reconfiguration of bandwidth allocations and routing paths through software control rather than fixed hardware connections.
2Ease of operation
If digital transponders are used with digital signal processing, then the switching flexibility and bandwidth control are improved, but the device complexity and processing requirements increase
Solution Approach 1:
The digital processing function is segmented into discrete transponder slices, each handling specific frequency ranges. Each slice contains a digital channelizer that divides incoming signals into frequency slices, a digital switch for flexible routing, and a digital combiner for reassembly. This segmentation makes the complex digital processing manageable and configurable.
Solution Approach 2:
The digital switch within each transponder slice enables dynamic reconfiguration of signal paths. The system can adaptively route different frequency slices to different destinations based on real-time communication requirements, allowing flexible bandwidth management and interference avoidance without fixed hardware constraints.
3Adaptability or versatility
If multiple frequency slices are routed through a multiple stage switch network, then the routing capability and bandwidth allocation flexibility are enhanced, but the signal processing time and system complexity increase
Solution Approach 1:
The signal processing is divided into parallel transponder slices, each handling specific frequency ranges independently. The multiple stage switch network operates on segmented frequency slices rather than entire bandwidths, reducing the processing complexity and time for each individual slice while maintaining overall routing flexibility.
Solution Approach 2:
Each transponder slice processes only a portion of the total frequency spectrum, performing partial processing actions on segmented signals. This allows the system to handle multiple frequency slices simultaneously through parallel processing, reducing overall processing time compared to sequential handling of complete bandwidths.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the flexibility and efficiency of satellite transponders in processing and routing communications data, allowing for adaptable bandwidth allocation and interference protection, thereby improving overall satellite communication capabilities.
Implementation Method 1
analog to digital converters configured to convert the analog input to digital signals
Implementation Method 2
a digital channelizer configured to process the digital signals to generate a plurality of frequency slices
Implementation Method 3
a digital combiner configured to assemble the plurality of frequency slices to form output sub-bands
Implementation Method 4
digital to analog converters configured to convert the output sub-bands to an analog output
Data Source
AI summary
An apparatus comprising a backplane and a number of transponder slices connected to the backplane to form a transponder. The number of transponder slices comprise an analog front end configured to receive an analog input comprising a first plurality of bandwidths and a first plurality of interface frequencies, analog to digital converters configured to convert the analog input to digital signals, a digital channelizer configured to process the digital signals to generate a plurality of frequency slices, a digital combiner configured to assemble the plurality of frequency slices to form output sub-bands, a digital switch configured to route the plurality of frequency slices from the digital channelizer to the digital combiner, digital to analog converters configured to convert the output sub-bands to an analog output, and an analog back end configured to transmit the analog output comprising a second plurality of bandwidths and a second plurality of interface frequencies.