Create propagation_p368.py

.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+    "python.testing.pytestArgs": [
+        "pycraf"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true,
+    "python-envs.defaultEnvManager": "ms-python.python:conda",
+    "python-envs.defaultPackageManager": "ms-python.python:conda"
+}

pycraf/conversions/conversions.py

@@ -25,6 +25,7 @@
     'dB_mW_MHz', 'dBm_MHz',  # this is often used in engineering (dBm/MHz)
     'dB_1_m',
     'dB_uV_m',
+    'dB_uA_m',
     ]
 
 __all__ = [
@@ -57,6 +58,7 @@
 dBm = dB_mW = apu.dB(apu.mW)
 dBm_MHz = dB_mW_MHz = apu.dB(apu.mW / apu.MHz)
 dB_uV_m = apu.dB(apu.uV ** 2 / apu.m ** 2)
+dB_uA_m = apu.dB(apu.uA ** 2 / apu.m ** 2)
 dB_1_m = apu.dB(1. / apu.m)  # for antenna factor
 
 # Astropy.unit equivalency between linear and logscale field strength
@@ -94,8 +96,29 @@ def efield_equivalency():
         )]
 
 
+def magfield_equivalency():
+    '''
+    `~astropy.units` equivalency to handle log-scale magnetic field units.
+
+    For magnetic fields, the Decibel scale is define via the amplitude
+    of the field squared, :math:`{\\vert\\vec B\\vert}^2` which is
+    proportional to the power.
+
+    Returns
+    -------
+    equivalency : list
+        The returned list contains one tuple with the equivalency.
+    '''
+    return [(
+        apu.uA / apu.m,
+        (apu.uA / apu.m) ** 2,
+        lambda x: x ** 2,
+        lambda x: x ** 0.5
+        )]
+
 # apu.add_enabled_equivalencies(apu.logarithmic())
 apu.add_enabled_equivalencies(efield_equivalency())
+apu.add_enabled_equivalencies(magfield_equivalency())
 
 # define some useful constants
 MU0_VALUE = 1.2566370614359173e-06

pycraf/conversions/tests/test_conversions.py

@@ -74,6 +74,11 @@ def test_db_scales(self):
                 _val
                 )
 
+            assert_quantity_allclose(
+                (_db * cnv.dB_uA_m).to((apu.uA / apu.m) ** 2).value,
+                _val
+                )
+
     def test_constants(self):
 
         assert_quantity_allclose(

pycraf/pathprof/__init__.py

@@ -17,6 +17,7 @@
 from .bel import *
 from .imt import *
 from .srtm import *
+from .low_freq_propagation import *
 
 _clutter_table = '''
 +-------+-------------------+------+------+