Software-Defined Protocol Translation Middleware for MIL-STD-1553B and STANAG 4586 Interoperability: Architecture, Comparative Analysis, and Deployment Roadmap

The coexistence of MIL-STD-1553B-equipped legacy combat platforms and STANAG 4586-compliant unmanned aerial systems (UAS) represents an unresolved interoperability deficit spanning every armed force operating mixed-generation fleets. Existing solutions—proprietary hardware gateways from Western vendors—are opaque, non-auditable, and incompatible with national indigenisation requirements. This paper presents a software-defined middleware architecture bridging MIL-STD-1553B and STANAG 4586 Edition 2 Amendment 1 through a protocol-agnostic Common Internal Representation (CIR). Four contributions are presented: (i) a systematic gap analysis identifying 49 field-level incompatibilities classified by a six-category taxonomy (DIRECT, LOSSY, APPROXIMATE, STUB, DROP, UNTRANSLATABLE) and grouped into fifteen architectural gap identifiers; (ii) a five-component hub-and-spoke middleware architecture reducing translation complexity from N×(N−1) to 2N adapter implementations; (iii) a structured comparative analysis demonstrating superior field-level auditability and indigenous modifiability relative to commercial gateways; and (iv) a simulation-based validation confirming sub-millisecond Translation Engine latency with zero silent information loss, assessed at Technology Readiness Level 4 with a concrete roadmap to TRL 6. The architecture supports Link 16 and Data Distribution Service extension and is aligned with India’s Atmanirbhar Bharat and iDEX defence innovation frameworks.