LunaNet Spec Implementation Guide
Source basis:
Tracks/LunaNet/spec.pdfTracks/LunaNet/lunanet-signal-in-space-recommended-standard-augmented-forward-signal-vol-a.pdf - LSIS-AFS-volA.pdf
Purpose
Translate LSIS-AFS normative definitions into implementation boundaries and verification rules for the software reference implementation.
Normative Focus Areas For This Competition
- Spreading code generation families and assignments
- Frame/message structure and timing
- BCH/LDPC/CRC/interleaving behavior
- Baseband modulation and I/Q generation
- Frame synchronization and decode flows
- Message parsing and timing reconstruction
Sections With Highest Implementation Impact
- 2.3.x signal structure and code generation behavior
- 2.4.x frame structure and coding flow
- 2.5.x message content and field semantics
- Appendix C/D/E code parameter references
Why this prioritization:
- These sections directly determine algorithm outputs and interoperability, which dominate scoring.
Architecture Rules
- Separate deterministic code generation from framing/encoding.
- Separate signal synthesis from decoding pipelines.
- Keep codec primitives (BCH/LDPC/CRC/interleaver) independently testable.
- Keep parser logic independent from decoder internals.
Why these rules:
- They improve test isolation and reduce failure coupling between encode/decode paths.
Critical Constants To Treat As Configuration-Backed
- PRN assignments and code parameters
- Sync pattern symbols and frame lengths
- Subframe sizes and coding settings
- Chip and symbol rates
Why configuration-backed:
- Hardcoding constants across modules creates drift and difficult auditability.
Risk Hotspots
- Off-by-one errors in frame/subframe boundaries
- Incorrect puncturing/interleaving behavior in LDPC path
- Inconsistent code coherency across channels
- Symbol/chip rate mismatch and output timing drift
Spec Governance Roles
- Engineer A: normative interpretation owner
- Engineer B: evidence and test-threshold owner
- Engineer C: interoperability conformance owner
- Developers A/B/C: section-linked implementation and test evidence generation
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