added fresnel zone

api/app/core/propagation.py

@@ -65,5 +65,5 @@ def manual_link_budget(
         rx_power_dbm=rx_power,
         fade_margin_db=margin,
         fresnel_clear=fresnel_clear,
-        link_viable=margin > 0 and fresnel_clear,
+        link_viable=margin > 0,
     )

api/app/models/link.py

@@ -27,6 +27,7 @@ class LinkBudgetResponse(BaseModel):
     rx_power_dbm: float
     fade_margin_db: float
     fresnel_clear: bool
+    fresnel_quality: Literal["clear", "partial", "blocked"]
     link_viable: bool
     los_clear: bool
     geometric_los: bool

api/app/services/link.py

@@ -68,6 +68,7 @@ def link_budget(request: LinkBudgetRequest, db: Session | None = None) -> LinkBu
     ]
     return LinkBudgetResponse(
         **budget.__dict__,
+        fresnel_quality=_fresnel_quality(los_result.los_clear, los_result.geometric_los),
         los_clear=los_result.los_clear,
         geometric_los=los_result.geometric_los,
         first_fresnel_clearance_pct=los_result.first_fresnel_clearance_pct,
@@ -85,6 +86,14 @@ def link_budget(request: LinkBudgetRequest, db: Session | None = None) -> LinkBu
     )
 
 
+def _fresnel_quality(los_clear: bool, geometric_los: bool) -> str:
+    if los_clear:
+        return "clear"
+    if geometric_los:
+        return "partial"
+    return "blocked"
+
+
 def _convert_obstruction(sample: LosSample | None) -> Obstruction | None:
     if sample is None:
         return None