def MakeLatLngPairs(n_pairs,
dmin_meters=0, dmax_meters=150000.,
lat_min=32.8, lat_max=41.0,
lng_min=-117.0, lng_max=-80):
"""Generates random pairs of points within distance.
Each pair of points are within a bounding box, and at at
controllable distance from each other.
Inputs:
n_pairs: number of pairs to generate.
d_min_meters, d_max_meters: range of distance for each pair of
points (default 0 to 150km)
lat_min, lat_max, lng_min, lng_max: bounding box that contain
pair of points
By default uses a bounding box fully included in continental
US border (but not covering all US).
Returns:
an array of tuple (lat1,lng1, lat2, lng2) of size n_pairs
"""
pair_points = []
while len(pair_points) < n_pairs:
lat1 = np.random.uniform(lat_min, lat_max)
lng1 = np.random.uniform(lng_min, lng_max)
bearing = np.random.uniform(0., 360.)
dist = np.random.uniform(dmin_meters, dmax_meters)
lat2, lng2, _ = vincenty.GeodesicPoint(lat1, lng1, dist, bearing)
if (lat2 < lat_min or lat2 > lat_max or
lng2 < lng_min or lng2 > lng_max):
continue
pair_points.append((lat1, lng1, lat2, lng2))
return pair_points
def test_computeFssBlocking(self):
# Mock things propag and FSS antenna. -70dBm at 30km
wf_itm.CalcItmPropagationLoss = testutils.FakePropagationPredictor(
dist_type='REAL', factor=1.0, offset=70 - 30.0)
antenna.GetFssAntennaGains = mock.create_autospec(
antenna.GetFssAntennaGains, return_value=2.8)
# Create FSS and a CBSD at 30km
fss_point, fss_info, _ = data.getFssInfo(TestAggInterf.fss_record)
fss_freq_range = (3650e6, 3750e6)
cbsd_lat, cbsd_lon, _ = vincenty.GeodesicPoint(fss_point[1],
fss_point[0], 30, 0)
cbsd = entities.CBSD_TEMPLATE_CAT_A_OUTDOOR._replace(
latitude=cbsd_lat, longitude=cbsd_lon)
grant = entities.ConvertToCbsdGrantInfo([cbsd], 3640, 3680)[0]
constraint = data.ProtectionConstraint(
fss_point[1], fss_point[0], 3550e6, fss_freq_range[0],
data.ProtectedEntityType.FSS_BLOCKING)
itf = interf.computeInterferenceFssBlocking(grant, constraint,
fss_info, grant.max_eirp)
self.assertAlmostEqual(
itf,
20 + # EIRP/MHZ
10 + # 10MHz effective bandwidth
-70 # pathloss
+ 2.8 # FSS antenna gain
- 3.1634, # FSS mask loss for adjacent 10MHz
4)
def test_SimplePpaCircle(self):
# Configuring for -96dBm circle at 16km includes
wf_hybrid.CalcHybridPropagationLoss = testutils.FakePropagationPredictor(
dist_type='REAL', factor=1.0, offset=(96+30-0.1) - 16.0)
expected_ppa = sgeo.Polygon(
[vincenty.GeodesicPoint(
TestPpa.devices[0]['installationParam']['latitude'],
TestPpa.devices[0]['installationParam']['longitude'],
dist_km=16.0, bearing=angle)[1::-1] # reverse to lng,lat
for angle in xrange(360)])
ppa_zone = ppa.PpaCreationModel(TestPpa.devices, TestPpa.pal_records)
ppa_zone = json.loads(ppa_zone)
self.assertAlmostSamePolygon(
utils.ToShapely(ppa_zone), expected_ppa, 0.001)
def GenerateCbsdList(n_cbsd, template_cbsd,
ref_latitude, ref_longitude,
min_distance_km=1,
max_distance_km=150,
min_angle=0, max_angle=360):
"""Generate a random list of CBSDs from a CBSD template.
The CBSD are randomly generated in a circular sector around a reference point,
and using a CBSD template.
If the template contains a list of azimuth, then multi-sector CBSD are built
with the given azimuths. Otherwise a random azimuth is used.
Inputs:
n_cbsd: Number of CBSD to generate.
template_cbsd: A |Cbsd| namedtuple used as a template for all non location
parameters.
ref_latitude: Reference point latitude (degrees).
ref_longitude: Reference point longitude (degrees).
min_distance_km: Minimum distance of CBSD from central point (km). Default 1km.
max_distance_km: Maximum distance of CBSD from central point (km). Default 150km.
min_angle: Minimum angle of the circular sector (degrees). Default 0
max_angle: Maximum angle of the circular sector (degrees). Default 360
Note that 0 degree is the north, and the angle goes clockwise.
Returns:
a list of |Cbsd| namedtuple
"""
distances = np.random.uniform(min_distance_km, max_distance_km, n_cbsd)
bearings = np.random.uniform(min_angle, max_angle, n_cbsd)
t = template_cbsd
azimuths = (t.antenna_azimuth if isinstance(t.antenna_azimuth, list)
else [t.antenna_azimuth])
cbsds = []
for k in xrange(n_cbsd):
lat, lng, _ = vincenty.GeodesicPoint(ref_latitude, ref_longitude,
distances[k], bearings[k])
for azimuth in azimuths:
cbsd = Cbsd(lat, lng,
t.height_agl, t.is_indoor, t.category, t.eirp_dbm_mhz,
int(azimuth + np.random.uniform(0, 360)) % 360,
t.antenna_beamwidth, t.antenna_gain)
cbsds.append(cbsd)
return cbsds
def _GetPolygon(device):
"""Returns the PPA contour for a single CBSD device, as a shapely polygon."""
install_param = device['installationParam']
eirp_capability = install_param.get(
'eirpCapability', MAX_ALLOWABLE_EIRP_PER_10_MHZ_CAT_A if
device['cbsdCategory'] == 'A' else MAX_ALLOWABLE_EIRP_PER_10_MHZ_CAT_B)
# Compute all the Points in 0-359 every 200m up to 40km
distances = np.arange(0.2, 40.1, 0.2)
azimuths = np.arange(0.0, 360.0)
latitudes, longitudes, _ = zip(*[
vincenty.GeodesicPoints(install_param['latitude'],
install_param['longitude'], distances, azimuth)
for azimuth in azimuths
])
# Compute the Gain for all Direction
# Note: some parameters are optional for catA, so falling back to None (omni) then
antenna_gains = antenna.GetStandardAntennaGains(
azimuths, install_param['antennaAzimuth'] if 'antennaAzimuth'
in install_param else None, install_param['antennaBeamwidth']
if 'antennaBeamwidth' in install_param else None,
install_param['antennaGain'])
# Get the Nlcd Region Type for Cbsd
cbsd_region_code = drive.nlcd_driver.GetLandCoverCodes(
install_param['latitude'], install_param['longitude'])
cbsd_region_type = nlcd.GetRegionType(cbsd_region_code)
# Compute the Path Loss, and contour based on Gain and Path Loss Comparing with Threshold
# Smoothing Contour using Hamming Filter
contour_dists_km = _HammingFilter([
_CalculateDbLossForEachPointAndGetContour(install_param,
eirp_capability, ant_gain,
cbsd_region_type,
radial_lats, radial_lons)
for radial_lats, radial_lons, ant_gain in zip(latitudes, longitudes,
antenna_gains)
])
# Generating lat, lon for Contour
contour_lats, contour_lons, _ = zip(*[
vincenty.GeodesicPoint(install_param['latitude'],
install_param['longitude'], dists, az)
for dists, az in zip(contour_dists_km, azimuths)
])
return sgeo.Polygon(zip(contour_lons, contour_lats)).buffer(0)
def CalcItmPropagationLoss(lat_cbsd,
lon_cbsd,
height_cbsd,
lat_rx,
lon_rx,
height_rx,
cbsd_indoor=False,
reliability=0.5,
freq_mhz=3625.,
its_elev=None,
is_height_cbsd_amsl=False,
return_internals=False):
"""Implements the WinnForum-compliant ITM point-to-point propagation model.
According to WinnForum spec R2-SGN-17, R2-SGN-22 and R2-SGN-5 to 10.
One can use this routine in 3 ways:
reliability = -1 : to get the average path loss
reliability in [0,1] : to get a pathloss for given quantile
sequence of reliabilities: to get an array of pathloss. Used to obtain
inverse CDF of the pathloss.
Inputs:
lat_cbsd, lon_cbsd, height_cbsd: Lat/lon (deg) and height AGL (m) of CBSD
lat_rx, lon_rx, height_rx: Lat/lon (deg) and height AGL (m) of Rx point
cbsd_indoor: CBSD indoor status - Default=False.
reliability: Reliability. Default is 0.5 (median value)
Different options:
value in [0,1]: returns the CDF quantile
-1: returns the mean path loss
iterable sequence: returns a list of path losses
freq_mhz: Frequency (MHz). Default is mid-point of band.
its_elev: Optional profile to use (in ITM format). Default=None
If not specified, it is extracted from the terrain.
is_height_cbsd_amsl: If True, the CBSD height shall be considered as AMSL (Average
mean sea level).
return_internals: If True, returns internal variables.
Returns:
A namedtuple of:
db_loss Path Loss in dB, either a scalar if reliability is scalar
or a list of path losses if reliability is an iterable.
incidence_angles: A namedtuple of
hor_cbsd: Horizontal departure angle (bearing) from CBSD to Rx
ver_cbsd: Vertical departure angle at CBSD
hor_rx: Horizontal incidence angle (bearing) from Rx to CBSD
ver_rx: Vertical incidence angle at Rx
internals: A dictionary of internal data for advanced analysis
(only if return_internals=True):
itm_err_num: ITM error code from ItmErrorCode (see GetInfoOnItmCode).
itm_str_mode: String containing description of dominant prop mode.
dist_km: Distance between end points (km).
prof_d_km ndarray of distances (km) - x values to plot terrain.
prof_elev ndarray of terrain heightsheights (m) - y values to plot terrain,
Raises:
Exception if input parameters invalid or out of range.
"""
# Case of same points
if (lat_cbsd == lat_rx and lon_cbsd == lon_rx):
return _PropagResult(db_loss=0 if np.isscalar(reliability) else [0] *
len(reliability),
incidence_angles=_IncidenceAngles(0, 0, 0, 0),
internals=None)
# Sanity checks on input parameters
if freq_mhz < 40.0 or freq_mhz > 10000:
raise Exception('Frequency outside range [40MHz - 10GHz]')
if is_height_cbsd_amsl:
altitude_cbsd = drive.terrain_driver.GetTerrainElevation(
lat_cbsd, lon_cbsd)
height_cbsd = height_cbsd - altitude_cbsd
# Ensure minimum height of 1 meter
if height_cbsd < 1:
height_cbsd = 1
if height_rx < 1:
height_rx = 1
# Internal ITM parameters are always set to following values in WF version:
confidence = 0.5 # Confidence (always 0.5)
dielec = 25. # Dielectric constant (always 25.)
conductivity = 0.02 # Conductivity (always 0.02)
polarization = 1 # Polarization (always vertical = 1)
mdvar = 13
# Get the terrain profile, using Vincenty great circle route, and WF
# standard (bilinear interp; 1500 pts for all distances over 45 km)
if its_elev is None:
its_elev = drive.terrain_driver.TerrainProfile(lat1=lat_cbsd,
lon1=lon_cbsd,
lat2=lat_rx,
lon2=lon_rx,
target_res_meter=30.,
do_interp=True,
max_points=1501)
# Find the midpoint of the great circle path
dist_km, bearing_cbsd, bearing_rx = vincenty.GeodesicDistanceBearing(
lat_cbsd, lon_cbsd, lat_rx, lon_rx)
latmid, lonmid, _ = vincenty.GeodesicPoint(lat_cbsd, lon_cbsd,
dist_km / 2., bearing_cbsd)
# Determine climate value, based on ITU-R P.617 method:
climate = drive.climate_driver.TropoClim(latmid, lonmid)
# If the common volume lies over the sea, the climate value to use depends
# on the climate values at either end. A simple min() function should
# properly implement the logic, since water is the max.
if climate == 7:
climate = min(drive.climate_driver.TropoClim(lat_cbsd, lon_cbsd),
drive.climate_driver.TropoClim(lat_rx, lon_rx))
# Look up the refractivity at the path midpoint, if not explicitly provided
refractivity = drive.refract_driver.Refractivity(latmid, lonmid)
# Call ITM prop loss.
reliabilities = reliability
do_avg = False
if np.isscalar(reliabilities) and reliability == -1:
# Pathloss mean: average the value for 1% to 99% included
reliabilities = np.arange(0.01, 1.0, 0.01)
do_avg = True
db_loss, ver_cbsd, ver_rx, str_mode, err_num = itm.point_to_point(
its_elev, height_cbsd, height_rx, dielec, conductivity, refractivity,
freq_mhz, climate, polarization, confidence, reliabilities, mdvar,
False)
if do_avg:
db_loss = -10 * np.log10(np.mean(10**(-np.array(db_loss) / 10.)))
# Add indoor losses
if cbsd_indoor:
if np.isscalar(db_loss):
db_loss += 15
else:
db_loss = [loss + 15 for loss in db_loss]
# Create distance/terrain arrays for plotting if desired
internals = None
if return_internals:
prof_d_km = (its_elev[1] / 1000.) * np.arange(len(its_elev) - 2)
prof_elev = np.asarray(its_elev[2:])
internals = {
'itm_err_num': err_num,
'itm_str_mode': str_mode,
'dist_km': dist_km,
'prof_d_km': prof_d_km,
'prof_elev': prof_elev
}
return _PropagResult(db_loss=db_loss,
incidence_angles=_IncidenceAngles(
hor_cbsd=bearing_cbsd,
ver_cbsd=ver_cbsd,
hor_rx=bearing_rx,
ver_rx=ver_rx),
internals=internals)
def generate_FAD_2_default_config(self, filename):
"""Generates the WinnForum configuration for FAD_2"""
# Create the actual config for FAD_2
# Load the esc sensor in SAS Test Harness
esc_sensor = json.load(
open(
os.path.join('testcases', 'testdata',
'esc_sensor_record_0.json')))
# Load the device_c1 with registration in SAS Test Harness
device_c1 = json.load(
open(os.path.join('testcases', 'testdata', 'device_a.json')))
# Get a latitude and longitude within 40 kms from ESC.
latitude, longitude, _ = vincenty.GeodesicPoint(
esc_sensor['installationParam']['latitude'],
esc_sensor['installationParam']['longitude'], 0.1,
30) # distance of 0.1 km from ESC at 30 degrees
# Load the device_c1 in the neighborhood area of the ESC sensor
device_c1['installationParam']['latitude'] = latitude
device_c1['installationParam']['longitude'] = longitude
# Load grant request for device_c1
grant_g1 = json.load(
open(os.path.join('testcases', 'testdata', 'grant_0.json')))
grant_g1['operationParam']['maxEirp'] = 20
# Load one ppa in SAS Test Harness
pal_record_0 = json.load(
open(os.path.join('testcases', 'testdata', 'pal_record_0.json')))
pal_low_frequency = 3550000000
pal_high_frequency = 3560000000
ppa_record_0 = json.load(
open(os.path.join('testcases', 'testdata', 'ppa_record_0.json')))
ppa_record_a, pal_records = makePpaAndPalRecordsConsistent(
ppa_record_0, [pal_record_0], pal_low_frequency,
pal_high_frequency, 'test_user_1')
# Load device_c3 in SAS Test Harness
device_c3 = json.load(
open(os.path.join('testcases', 'testdata', 'device_c.json')))
# Load the device_c3 in the neighborhood area of the PPA
device_c3['installationParam']['latitude'] = 38.821322
device_c3['installationParam']['longitude'] = -97.280040
# Load grant request for device_c3 in SAS Test Harness
grant_g3 = json.load(
open(os.path.join('testcases', 'testdata', 'grant_0.json')))
grant_g3['operationParam']['maxEirp'] = 20
# Update grant_g3 frequency to overlap with PPA zone frequency for C3 device
grant_g3['operationParam']['operationFrequencyRange'] = {
'lowFrequency': 3550000000,
'highFrequency': 3555000000
}
# Load the device_c2 with registration to SAS UUT
device_c2 = json.load(
open(os.path.join('testcases', 'testdata', 'device_b.json')))
# Get a latitude and longitude within 40 kms from ESC.
latitude, longitude, _ = vincenty.GeodesicPoint(
esc_sensor['installationParam']['latitude'],
esc_sensor['installationParam']['longitude'], 0.1,
30) # distance of 0.1 km from ESC at 30 degrees
device_c2['installationParam']['latitude'] = latitude
device_c2['installationParam']['longitude'] = longitude
# Creating conditionals for C2 and C4.
self.assertEqual(device_c2['cbsdCategory'], 'B')
conditional_parameters_c2 = {
'cbsdCategory': device_c2['cbsdCategory'],
'fccId': device_c2['fccId'],
'cbsdSerialNumber': device_c2['cbsdSerialNumber'],
'airInterface': device_c2['airInterface'],
'installationParam': device_c2['installationParam'],
'measCapability': device_c2['measCapability']
}
del device_c2['cbsdCategory']
del device_c2['airInterface']
del device_c2['installationParam']
# Load grant request for device_c2 to SAS UUT
grant_g2 = json.load(
open(os.path.join('testcases', 'testdata', 'grant_0.json')))
grant_g2['operationParam']['maxEirp'] = 30
# Load the device_c4 with registration to SAS UUT.
device_c4 = json.load(
open(os.path.join('testcases', 'testdata', 'device_d.json')))
# Move device_c4 in the neighborhood area of the PPA
device_c4['installationParam']['latitude'] = 38.8363
device_c4['installationParam']['longitude'] = -97.2642
device_c4['installationParam']['antennaBeamwidth'] = 0
# Creating conditionals for Cat B devices.
self.assertEqual(device_c4['cbsdCategory'], 'B')
conditional_parameters_c4 = {
'cbsdCategory': device_c4['cbsdCategory'],
'fccId': device_c4['fccId'],
'cbsdSerialNumber': device_c4['cbsdSerialNumber'],
'airInterface': device_c4['airInterface'],
'installationParam': device_c4['installationParam'],
'measCapability': device_c4['measCapability']
}
del device_c4['cbsdCategory']
del device_c4['airInterface']
del device_c4['installationParam']
# Load grant request for device_c4 to SAS UUT
grant_g4 = json.load(
open(os.path.join('testcases', 'testdata', 'grant_0.json')))
grant_g4['operationParam']['maxEirp'] = 20
#Update grant_g4 frequency to overlap with PPA zone frequency for C4 device
grant_g4['operationParam']['operationFrequencyRange'] = {
'lowFrequency': 3550000000,
'highFrequency': 3555000000
}
conditionals = {
'registrationData':
[conditional_parameters_c2, conditional_parameters_c4]
}
cbsd_records = [device_c1, device_c3]
grant_record_list = [[grant_g1], [grant_g3]]
ppa_records = [ppa_record_a]
# Creating CBSD reference IDs of valid format
cbsd_reference_id1 = generateCbsdReferenceId('test_fcc_id_x',
'test_serial_number_x')
cbsd_reference_id2 = generateCbsdReferenceId('test_fcc_id_y',
'test_serial_number_y')
cbsd_reference_ids = [[cbsd_reference_id1, cbsd_reference_id2]]
# SAS test harness configuration
sas_harness_config = {
'sasTestHarnessName': 'SAS-TH-1',
'hostName': getFqdnLocalhost(),
'port': getUnusedPort(),
'serverCert': getCertFilename('sas.cert'),
'serverKey': getCertFilename('sas.key'),
'caCert': "certs/ca.cert"
}
# Generate FAD Records for each record type like cbsd,zone and esc_sensor
cbsd_fad_records = generateCbsdRecords(cbsd_records, grant_record_list)
ppa_fad_records = generatePpaRecords(ppa_records, cbsd_reference_ids)
esc_fad_records = [esc_sensor]
sas_harness_dump_records = {
'cbsdRecords': cbsd_fad_records,
'ppaRecords': ppa_fad_records,
'escSensorRecords': esc_fad_records
}
config = {
'registrationRequestC2': device_c2,
'registrationRequestC4': device_c4,
'conditionalRegistrationData': conditionals,
'grantRequestG2': grant_g2,
'grantRequestG4': grant_g4,
'palRecords': pal_records,
'sasTestHarnessConfig': sas_harness_config,
'sasTestHarnessDumpRecords': sas_harness_dump_records
}
writeConfig(filename, config)
def CalcHybridPropagationLoss(lat_cbsd,
lon_cbsd,
height_cbsd,
lat_rx,
lon_rx,
height_rx,
cbsd_indoor=False,
reliability=-1,
freq_mhz=3625.,
region='RURAL',
is_height_cbsd_amsl=False,
return_internals=False):
"""Implements the Hybrid ITM/eHata NTIA propagation model.
As specified by Winforum, see:
R2-SGN-03, R2-SGN-04 through R2-SGN-10 and NTIA TR 15-517 Appendix A.
Note that contrary to the ITM model, this function does not provide the
possibility to retrieve a CDF of path losses, as it is not required in the
intended use of that model (it shall be used currently only for protecting
zones using average aggregated interference).
Warning: Only 'reliability' values 0.5 (median) and -1 (average) are currently
fully supported, as other values will not return the quantile when using
internally the eHata model. Workaround is to apply it afterwards when the
returned opcode=4, and using the standard deviation obtained with the
'GetEHataStdev()' routine.
Inputs:
lat_cbsd, lon_cbsd, height_cbsd: Lat/lon (deg) and height AGL (m) of CBSD
lat_rx, lon_rx, height_rx: Lat/lon (deg) and height AGL (m) of Rx point
cbsd_indoor: CBSD indoor status - Default=False.
freq_mhz: Frequency (MHz). Default is mid-point of band.
reliability: Reliability. Default is -1 (average value).
Options:
Value in [0,1]: returns the CDF quantile
-1: returns the mean path loss
region: Region type among 'URBAN', 'SUBURBAN, 'RURAL'
is_height_cbsd_amsl: If True, the CBSD height shall be considered as AMSL (Average
mean sea level).
Returns:
A namedtuple of:
db_loss: Path Loss in dB.
incidence_angles: A namedtuple of angles (degrees)
hor_cbsd: Horizontal departure angle (bearing) from CBSD to Rx
ver_cbsd: Vertical departure angle at CBSD
hor_rx: Horizontal incidence angle (bearing) from Rx to CBSD
ver_rx: Vertical incidence angle at Rx
internals: A dictionary of internal data for advanced analysis
(only if return_internals=True):
hybrid_opcode: Opcode from HybridCode - See GetInfoOnHybridCodes()
effective_height_cbsd: Effective CBSD antenna height
itm_db_loss: Loss in dB for the ITM model.
itm_err_num: ITM error code (see wf_itm module).
itm_str_mode: Description (string) of dominant prop mode in ITM.
dist_km: Distance between end points (km)
prof_d_km ndarray of distances (km) - x values to plot terrain.
prof_elev ndarray of terrain heightsheights (m) - y values to plot terrain,
Raises:
Exception if input parameters invalid or out of range.
"""
# Case of same points
if (lat_cbsd == lat_rx and lon_cbsd == lon_rx):
return _PropagResult(db_loss=0,
incidence_angles=_IncidenceAngles(0, 0, 0, 0),
internals=None)
# Sanity checks on input parameters
if freq_mhz < 40 or freq_mhz > 10000:
raise Exception('Frequency outside range [40MHz - 10GHz].')
if region not in ['RURAL', 'URBAN', 'SUBURBAN']:
raise Exception('Region %s not allowed' % region)
if reliability not in (-1, 0.5):
raise Exception('Hybrid model only computes the median or the mean.')
if is_height_cbsd_amsl:
altitude_cbsd = drive.terrain_driver.GetTerrainElevation(
lat_cbsd, lon_cbsd)
height_cbsd = height_cbsd - altitude_cbsd
# Get the terrain profile, using Vincenty great circle route, and WF
# standard (bilinear interp; 1501 pts for all distances over 45 km)
its_elev = drive.terrain_driver.TerrainProfile(lat1=lat_cbsd,
lon1=lon_cbsd,
lat2=lat_rx,
lon2=lon_rx,
target_res_meter=30.,
do_interp=True,
max_points=1501)
# Structural CBSD and mobile height corrections
height_cbsd = max(height_cbsd, 20.)
height_rx = 1.5
# Calculate the predicted ITM loss
# and get the distance and profile for use in further logic
db_loss_itm, incidence_angles, internals = wf_itm.CalcItmPropagationLoss(
lat_cbsd,
lon_cbsd,
height_cbsd,
lat_rx,
lon_rx,
height_rx,
False,
reliability,
freq_mhz,
its_elev,
return_internals=True)
internals['itm_db_loss'] = db_loss_itm
# Calculate the effective heights of the tx
height_cbsd_eff = ehata.CbsdEffectiveHeights(height_cbsd, its_elev)
internals['effective_height_cbsd'] = height_cbsd_eff
# Use ITM if CBSD effective height greater than 200 m
if height_cbsd_eff >= 200:
return _BuildOutput(db_loss_itm, incidence_angles, internals,
HybridMode.ITM_HIGH_HEIGHT, cbsd_indoor)
# Set the environment code number.
if region == 'URBAN':
region_code = 23
elif region == 'SUBURBAN':
region_code = 22
else: # 'RURAL': use ITM
if not return_internals: return_internals = None
return _BuildOutput(db_loss_itm, incidence_angles, internals,
HybridMode.ITM_RURAL, cbsd_indoor)
# The eHata offset to apply (only in case the mean is requested)
offset_median_to_mean = _GetMedianToMeanOffsetDb(freq_mhz,
region == 'URBAN')
# Now process the different cases
dist_km = internals['dist_km']
if not return_internals: return_internals = None
if dist_km <= 0.1: # Use Free Space Loss
db_loss = CalcFreeSpaceLoss(dist_km, freq_mhz, height_cbsd, height_rx)
return _BuildOutput(db_loss, incidence_angles, internals,
HybridMode.FSL, cbsd_indoor)
elif dist_km > 0.1 and dist_km < 1: # Use E-Hata Median Basic Prop Loss
fsl_100m = CalcFreeSpaceLoss(0.1, freq_mhz, height_cbsd, height_rx)
median_basic_loss = ehata.MedianBasicPropLoss(freq_mhz, height_cbsd,
height_rx, 1,
region_code)
alpha = 1. + math.log10(dist_km)
db_loss = fsl_100m + alpha * (median_basic_loss - fsl_100m)
# TODO: validate the following approach with WinnForum participants:
# Weight the offset as well from 0 (100m) to 1.0 (1km).
if reliability == -1:
db_loss += alpha * offset_median_to_mean
return _BuildOutput(db_loss, incidence_angles, internals,
HybridMode.EHATA_FSL_INTERP, cbsd_indoor)
elif dist_km >= 1 and dist_km <= 80: # Use best of E-Hata / ITM
ehata_loss_med = ehata.ExtendedHata(its_elev, freq_mhz, height_cbsd,
height_rx, region_code)
if reliability == 0.5:
ehata_loss = ehata_loss_med
itm_loss_med = db_loss_itm
else:
ehata_loss = ehata_loss_med + offset_median_to_mean
itm_loss_med = wf_itm.CalcItmPropagationLoss(
lat_cbsd, lon_cbsd, height_cbsd, lat_rx, lon_rx, height_rx,
False, 0.5, freq_mhz, its_elev).db_loss
if itm_loss_med >= ehata_loss_med:
return _BuildOutput(db_loss_itm, incidence_angles, internals,
HybridMode.ITM_DOMINANT, cbsd_indoor)
else:
return _BuildOutput(ehata_loss, incidence_angles, internals,
HybridMode.EHATA_DOMINANT, cbsd_indoor)
elif dist_km > 80: # Use the ITM with correction from E-Hata @ 80km
# Calculate the ITM median and eHata median losses at 80km
bearing = incidence_angles.hor_cbsd
lat_80km, lon_80km, _ = vincenty.GeodesicPoint(lat_cbsd, lon_cbsd, 80.,
bearing)
its_elev_80km = drive.terrain_driver.TerrainProfile(
lat_cbsd,
lon_cbsd,
lat_80km,
lon_80km,
target_res_meter=30.,
do_interp=True,
max_points=1501)
ehata_loss_80km = ehata.ExtendedHata(its_elev_80km, freq_mhz,
height_cbsd, height_rx,
region_code)
itm_loss_80km = wf_itm.CalcItmPropagationLoss(lat_cbsd, lon_cbsd,
height_cbsd, lat_80km,
lon_80km, height_rx,
False, 0.5, freq_mhz,
its_elev_80km).db_loss
J = max(ehata_loss_80km - itm_loss_80km, 0)
db_loss = db_loss_itm + J
return _BuildOutput(db_loss, incidence_angles, internals,
HybridMode.ITM_CORRECTED, cbsd_indoor)