added formulas

2026-06-26 11:21:49 +03:00
parent d707e310dc
commit 70828f693e
6 changed files with 750 additions and 2 deletions
@@ -151,3 +151,103 @@ def test_link_viable_depends_on_margin_not_fresnel_quality(monkeypatch) -> None:
    assert result.fresnel_quality == "blocked"
    assert result.fresnel_clear is False
    assert result.link_viable is True
+
+
+def test_itm_link_budget_does_not_double_count_diffraction(monkeypatch) -> None:
+    monkeypatch.setattr(link_service, "vegetation_loss_along", lambda *args, **kwargs: 3.0)
+    monkeypatch.setattr(link_service, "atmospheric_loss_between", lambda *args, **kwargs: 2.0)
+    monkeypatch.setattr(link_service, "deygout", lambda *args, **kwargs: 99.0)
+    monkeypatch.setattr(
+        link_service,
+        "surface_profile_from_points",
+        lambda points, *args, **kwargs: SurfaceProfile(
+            distance_m=points[-1].distance_m,
+            samples=[
+                SurfaceSample(
+                    i=index,
+                    lat=point.lat,
+                    lon=point.lon,
+                    distance_m=point.distance_m,
+                    ground_m=0,
+                    building_m=0,
+                    canopy_m=0,
+                    surface_m=0,
+                )
+                for index, point in enumerate(points)
+            ],
+        ),
+    )
+
+    request = LinkBudgetRequest(
+        tx=LinkTx(lat=60.17, lon=24.94, height_agl=30, power_dbm=37, gain_dbi=8),
+        rx=LinkRx(lat=60.25, lon=25.10, height_agl=2, gain_dbi=2, sensitivity_dbm=-110),
+        frequency_mhz=433,
+        model="itm",
+        include_vegetation=True,
+    )
+    base = link_service.manual_link_budget(
+        request.tx,
+        request.rx,
+        request.tx.power_dbm,
+        request.tx.gain_dbi,
+        request.rx.gain_dbi,
+        request.rx.sensitivity_dbm,
+        request.frequency_mhz,
+    ).fspl_db
+    monkeypatch.setattr(link_service, "itm_loss", lambda *args, **kwargs: base + 12.0)
+
+    result = link_service.link_budget(request)
+
+    assert result.diffraction_db == 12.0
+    assert result.atmospheric_db == 2.0
+    assert isclose(result.total_loss_db, result.fspl_db + 12.0 + 3.0 + 2.0)
+
+
+def test_p452_link_budget_does_not_double_count_diffraction_or_atmosphere(monkeypatch) -> None:
+    monkeypatch.setattr(link_service, "vegetation_loss_along", lambda *args, **kwargs: 3.0)
+    monkeypatch.setattr(link_service, "atmospheric_loss_between", lambda *args, **kwargs: 99.0)
+    monkeypatch.setattr(link_service, "deygout", lambda *args, **kwargs: 88.0)
+    monkeypatch.setattr(
+        link_service,
+        "surface_profile_from_points",
+        lambda points, *args, **kwargs: SurfaceProfile(
+            distance_m=points[-1].distance_m,
+            samples=[
+                SurfaceSample(
+                    i=index,
+                    lat=point.lat,
+                    lon=point.lon,
+                    distance_m=point.distance_m,
+                    ground_m=0,
+                    building_m=0,
+                    canopy_m=0,
+                    surface_m=0,
+                )
+                for index, point in enumerate(points)
+            ],
+        ),
+    )
+
+    request = LinkBudgetRequest(
+        tx=LinkTx(lat=60.17, lon=24.94, height_agl=30, power_dbm=37, gain_dbi=8),
+        rx=LinkRx(lat=60.25, lon=25.10, height_agl=2, gain_dbi=2, sensitivity_dbm=-110),
+        frequency_mhz=433,
+        model="p452",
+        include_vegetation=True,
+    )
+    base = link_service.manual_link_budget(
+        request.tx,
+        request.rx,
+        request.tx.power_dbm,
+        request.tx.gain_dbi,
+        request.rx.gain_dbi,
+        request.rx.sensitivity_dbm,
+        request.frequency_mhz,
+    ).fspl_db
+    monkeypatch.setattr(link_service, "p452_loss", lambda *args, **kwargs: base + 14.0)
+
+    result = link_service.link_budget(request)
+
+    assert result.diffraction_db == 14.0
+    assert result.atmospheric_db == 0.0
+    assert isclose(result.total_loss_db, result.fspl_db + 14.0 + 3.0)