Is this flight software?

No. SIDUS models are educational reimplementations. Cross-check before any flight decision.

DSN array SNR gain

Coherent combining of N identical antennas: SNR scales as N (10 log10 N dB).

SIDUS educational calculator. Category satellite. Tags: comms, operations, RF, satellite. Pure SI. Not flight software.

G = N G_dB = 10 log₁₀ N

Coherent array SNR gain

Antenna Arraying Techniques in the Deep Space Network (NASA / JPL DESCANSO (Rogstad, Mileant, Pham)): Coherent array SNR for identical antennas scales as N. Not a DSN combiner.
Free-space attenuation (ITU-R P.525-5) (International Telecommunication Union Radiocommunication Sector (ITU-R)): ITU-R P.525-5 Eqs. (5)–(6): L_bf = 20 log10(4πd/λ); practical form uses d in km and f in MHz with a 32.4 dB constant. SIDUS uses 32.44 dB as an approximation of the same Friis relation.

Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.