Predictive Signal Cancellation for MIL-STD-1553 Bandwidth
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Solution Overview
Problem
The existing MIL-STD-1553 data bus infrastructure struggles to support high-speed networking standards due to bandwidth limitations, electromagnetic interference, and the presence of concurrent 1 Mb/s signals, which reduces the available spectrum for High Performance 1553 signaling.
Innovation Solution
The implementation of predictive cancellation techniques, both analog and digital, to subtract out the 1 Mb/s MIL-STD-1553 signals from the composite signal, allowing for the reception of High Performance 1553 signals without filtering, thus maximizing usable bandwidth and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low pass filters are installed to limit harmonic content above 1 MHz, then the 1 Mb/s MIL-STD-1553 signal quality is improved, but the High Performance 1553 signal bandwidth is reduced and cost increases
Solution Approach 1:
The patent extracts and removes the 1 Mb/s MIL-STD-1553 signal from the composite signal containing both 1 Mb/s and High Performance 1553 components. By separating the legacy signal component, the High Performance signal can utilize the full bandwidth without filtering limitations, resolving the contradiction between maintaining legacy signal quality and maximizing high-speed data rates
Solution Approach 2:
The patent changes the approach from frequency-domain filtering to time-domain signal subtraction. By modeling and subtracting the 1 Mb/s signal characteristics from the composite signal, the system preserves the full frequency spectrum for High Performance 1553 operation while maintaining legacy signal integrity through adaptive parameter adjustment
2Object-affected harmful factors
If the High Performance 1553 signal bandwidth is positioned above the 1 Mb/s signal spectrum, then interference from legacy signals is reduced, but the usable channel response is significantly weakened
Solution Approach 1:
The patent converts the harmful interference from 1 Mb/s signals into a beneficial separation mechanism. By using adaptive filtering and signal modeling, the system identifies and subtracts the legacy signal components, transforming the interference problem into an opportunity to isolate and enhance the High Performance 1553 signal across the entire frequency spectrum, including the valuable low-frequency band with strong channel response
3Reliability
If predictive cancellation is used to remove 1 Mb/s signals, then the signal-to-noise ratio for High Performance 1553 is improved, but the system complexity increases
Solution Approach 1:
The patent introduces an adaptive filter as an intermediary component that mediates between the composite signal and the High Performance 1553 receiver. This filter acts as a signal processing layer that adaptively cancels 1 Mb/s components through coefficient adjustment, improving signal-to-noise ratio while keeping the overall system architecture manageable through modular implementation
Data Source
AI summary
Method and apparatus for maximizing the usable bandwidth for High Performance 1553 terminals operating concurrently on the same physical bus with legacy 1 Mb/s MIL-STD-1553 terminals. More specifically, the method and apparatus provides implementation for predictive cancellation by synthesizing an estimate of the 1 Mb/s MIL-STD-1553 component of a composite 1 Mb/s plus High Performance 1553 input signal using either of two different techniques: (1) a combination of digital and analog techniques; and (2) an all digital technique. The synthesized signal is then subtracted from the composite signal. Both techniques employ an algorithm for minimizing the effects of clock skew between 1 Mb/s 1553 transmitting clocks and the local High Performance 1553 sampling clock. Both techniques also incorporate an adaptation algorithm for developing and maintaining digital models of 1 Mb/s 1553 signals received from multiple 1 Mb/s 1553 terminals on a bus.