Fix detector orientations

AUTHORS.md

@@ -69,6 +69,7 @@ Sharan Banagiri
 Shichao Wu
 Simon Stevenson
 Soichiro Morisaki
+Stephen R Green
 Sumeet Kulkarni
 Sylvia Biscoveanu
 Tathagata Ghosh

bilby/gw/detector/detectors/GEO600.interferometer

@@ -9,5 +9,5 @@ length = 0.6
 latitude = 52 + 14. / 60 + 42.528 / 3600
 longitude = 9 + 48. / 60 + 25.894 / 3600
 elevation = 114.425
-xarm_azimuth = 115.9431
-yarm_azimuth = 21.6117
+xarm_azimuth = 21.6117
+yarm_azimuth = 115.9431

bilby/gw/detector/detectors/K1.interferometer

@@ -15,3 +15,5 @@ longitude = 137 + 18 / 60 + 21.44171 / 3600
 elevation = 414.181
 xarm_azimuth = 90 - 60.39623489157727
 yarm_azimuth = 90 + 29.60357629670688
+xarm_tilt = 0.0031414
+yarm_tilt = -0.0036270

bilby/gw/detector/detectors/L1.interferometer

@@ -11,3 +11,5 @@ longitude = -(90 + 46. / 60 + 27.2654 / 3600)
 elevation = -6.574
 xarm_azimuth = 197.7165
 yarm_azimuth = 287.7165
+xarm_tilt = -3.121e-4
+yarm_tilt = -6.107e-4

test/gw/detector/interferometer_test.py

 import sys
 import unittest
+
+import lal
+import lalsimulation
 import pytest
 from packaging import version
 from shutil import rmtree
@@ -552,5 +555,46 @@ class TestInterferometerEquals(unittest.TestCase):
         self.assertNotEqual(self.ifo_1, self.ifo_2)
 
 
+class TestInterferometerAntennaPatternAgainstLAL(unittest.TestCase):
+    def setUp(self):
+        self.name = "name"
+        self.ifo_names = ['H1', 'L1', 'V1', 'K1', 'GEO600', 'ET']
+        self.lal_prefixes = {'H1': 'H1', 'L1': 'L1', 'V1': 'V1', 'K1': 'K1', 'GEO600': 'G1', 'ET': 'E1'}
+        self.polarizations = ['plus', 'cross', 'breathing', 'longitudinal', 'x', 'y']
+        self.ifos = bilby.gw.detector.InterferometerList(self.ifo_names)
+        self.gpstime = 1305303144
+        self.trial = 100
+
+    def tearDown(self):
+        del self.name
+        del self.ifo_names
+        del self.lal_prefixes
+        del self.polarizations
+        del self.ifos
+        del self.gpstime
+        del self.trial
+
+    def test_antenna_pattern_vs_lal(self):
+        gmst = lal.GreenwichMeanSiderealTime(self.gpstime)
+        f_bilby = np.zeros((self.trial, 6))
+        f_lal = np.zeros((self.trial, 6))
+
+        for n, ifo_name in enumerate(self.ifo_names):
+            response = lalsimulation.DetectorPrefixToLALDetector(self.lal_prefixes[ifo_name]).response
+            ifo = self.ifos[n]
+            for i in range(self.trial):
+                ra = 2. * np.pi * np.random.uniform()
+                dec = np.pi * np.random.uniform() - np.pi / 2.
+                psi = np.pi * np.random.uniform()
+                f_lal[i] = lal.ComputeDetAMResponseExtraModes(response, ra, dec, psi, gmst)
+                for m, pol in enumerate(self.polarizations):
+                    f_bilby[i, m] = ifo.antenna_response(ra, dec, self.gpstime, psi, pol)
+
+            std = np.std(f_bilby - f_lal, axis=0)
+            for m, pol in enumerate(self.polarizations):
+                with self.subTest(':'.join((ifo_name, pol))):
+                    self.assertAlmostEqual(std[m], 0.0, places=7)
+
+
 if __name__ == "__main__":
     unittest.main()