Pro Tier Module
RF Link Budget Analyzer
End-to-end RF link budget for EW / spectrum / satcom: transmit power and antenna gains in; EIRP, free-space + atmospheric + ITU-R P.838-3 rain path loss, received power, thermal noise floor, SNR, Eb/N0 and bit error rate (BPSK / QPSK / 8PSK / 16QAM) out, with the link margin against a target BER drawn as a waterfall.
This tool runs inside GDBS Pro. What it computes and the authorities it applies are below.
What it is
End-to-end RF link budget for EW / spectrum / satcom: transmit power and antenna gains in; EIRP, free-space + atmospheric + ITU-R P.838-3 rain path loss, received power, thermal noise floor, SNR, Eb/N0 and bit error rate (BPSK / QPSK / 8PSK / 16QAM) out, with the link margin against a target BER drawn as a waterfall. Closed-form, deterministic, entirely client-side, wall-time shown on every run. Rain (P.838-3) and BER (erfc fit) are published models; the dB arithmetic is exact. Standard published link-budget math.
Honest scope
Deterministic and citation-backed: every figure is exact arithmetic or a cited rule. Any year- or jurisdiction-indexed value is a confirmable input, never an eternal hardcode. This is a computation tool, not professional (legal, tax, medical, or financial) advice - confirm against the controlling authority for your context.
Authorities cited
- H. T. Friis (1946). A note on a simple transmission formula. Proc. IRE 34(5), 254-256. Free-space path loss / transmission formula. https://doi.org/10.1109/JRPROC.1946.234568
- Rec. ITU-R P.838-3 (2005). Specific attenuation model for rain for use in prediction methods. Coefficients k and alpha; gamma_R = k R^alpha. https://www.itu.int/rec/R-REC-P.838-3-200503-I/en
- Rec. ITU-R P.676 / P.372: gaseous atmospheric attenuation and radio noise (context for the fixed atmospheric-loss term and the -174 dBm/Hz thermal floor).
- J. G. Proakis, Digital Communications, 5th ed., McGraw-Hill 2008: closed-form BER/SER for M-PSK and M-QAM under AWGN with Gray coding.
- M. Abramowitz and I. Stegun, Handbook of Mathematical Functions, eq. 7.1.26: rational approximation to erf/erfc (max abs error 1.5e-7), used for Q(x).
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Run it on your own data
Open it inside GDBS to save runs to Sandbox, attach results to a Worklog case, or share through a Gate client portal - all in the browser, nothing uploaded to anyone’s cloud.