57 lines
1.6 KiB
Python
57 lines
1.6 KiB
Python
from math import isclose
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import pytest
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from app.core.antenna import AntennaPattern, gain
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from app.core.diffraction import knife_edge_loss
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from app.core.fresnel import earth_bulge, fresnel_radius, wavelength
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from app.core.propagation import fspl
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from app.core.vegetation import P833Coefficients, p833_attenuation
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def test_fspl_reference_value() -> None:
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assert isclose(fspl(433, 12.45), 107.08, abs_tol=0.05)
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def test_fresnel_radius_reference_value() -> None:
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lmbda = wavelength(433_000_000)
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assert isclose(fresnel_radius(lmbda, 6_225, 6_225), 46.45, abs_tol=0.05)
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def test_earth_bulge_reference_value() -> None:
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assert isclose(earth_bulge(6_225, 6_225, 1.333), 2.28, abs_tol=0.02)
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@pytest.mark.parametrize(
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("v", "expected"),
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[
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(-0.79, 0.0),
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(0.0, 6.03),
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(1.0, 13.93),
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],
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)
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def test_knife_edge_loss_reference_values(v: float, expected: float) -> None:
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assert isclose(knife_edge_loss(v), expected, abs_tol=0.05)
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def test_p833_formula_with_supplied_coefficients() -> None:
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attenuation = p833_attenuation(
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depth_m=100,
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freq_hz=433_000_000,
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forest_type="coniferous",
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coefficients=P833Coefficients(gamma_db_per_m=0.2, max_attenuation_db=30),
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)
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assert isclose(attenuation, 14.60, abs_tol=0.05)
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def test_sector_antenna_gain_peaks_at_boresight() -> None:
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pattern = AntennaPattern(
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pattern="sector",
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azimuth_deg=90,
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gain_dbi=8,
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beamwidth_h=65,
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beamwidth_v=15,
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)
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assert gain(pattern, 90, 0) == 8
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assert gain(pattern, 270, 0) < 8
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