first commit

2026-06-23 09:13:51 +03:00
commit f6c7db328f
103 changed files with 1618 additions and 0 deletions
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+def p676_gas_attenuation(freq_hz: float, distance_km: float) -> float:
+    if freq_hz <= 0:
+        raise ValueError("freq_hz must be positive")
+    if distance_km < 0:
+        raise ValueError("distance_km must be non-negative")
+    raise NotImplementedError("ITU-R P.676 gas attenuation requires pycraf integration")