standardize signal type

Author: betaBison

docs/source/reference/reference.rst

@@ -96,10 +96,10 @@ GNSS measurement naming conventions are as follows:
   name in lowercase, possible options are :code:`gps`, :code:`galileo`
   :code:`glonass`, :code:`qzss`, :code:`sbas`, etc.
 * :code:`sv_id` : (int) satellite vehicle identification number
-* :code:`signal_type` (string) Identifier for signal type, eg. GPS_L1,
-  GPS_L5 and GAL_E5. We use the first three characters (capitalized) to
-  represent the constellation, followed by an underscore and the
-  signal band.
+* :code:`signal_type` (string) Identifier for signal type, eg.
+  :code:`l1` for GPS L1 signal, :code:`e5` for Galileo's E5 signal or
+  :code:`b1i` for BeiDou's B1I signal. The string is expected to
+  consist of lowercase letters and numbers.
 * :code:`tx_sv_tow` (float) measured signal transmission time as
   sent by the space vehicle/satellite and in seconds since the start
   of the gps week.

gnss_lib_py/parsers/android.py

@@ -97,6 +97,20 @@ def postprocess(self):
                             }
         self.replace(constellation_map, rows="gnss_id", inplace=True)
 
+        # rename signal_type column to conform to standard convention
+        signal_map = {"GPS_L1" : "l1",
+                      "GPS_L5" : "l5",
+                      "GAL_E1" : "e1",
+                      "GAL_E5A" : "e5a",
+                      "GLO_G1" : "g1",
+                      "QZS_J1" : "j1",
+                      "QZS_J5" : "j5",
+                      "BDS_B1I" : "b1i",
+                      "BDS_B1C" : "b1c",
+                      "BDS_B2A" : "b2a",
+                     }
+        self.replace(signal_map, rows="signal_type", inplace=True)
+
     @staticmethod
     def _row_map():
         """Map of row names from loaded to gnss_lib_py standard
@@ -174,7 +188,21 @@ def postprocess(self):
                              7.:"irnss",
                             }
         self.replace(constellation_map, rows="gnss_id", inplace=True)
-    
+
+        # rename signal_type column to conform to standard convention
+        signal_map = {"GPS_L1" : "l1",
+                      "GPS_L5" : "l5",
+                      "GAL_E1" : "e1",
+                      "GAL_E5A" : "e5a",
+                      "GLO_G1" : "g1",
+                      "QZS_J1" : "j1",
+                      "QZS_J5" : "j5",
+                      "BDS_B1I" : "b1i",
+                      "BDS_B1C" : "b1c",
+                      "BDS_B2A" : "b2a",
+                     }
+        self.replace(signal_map, rows="signal_type", inplace=True)
+
     @staticmethod
     def _row_map():
         """Map of row names from loaded to gnss_lib_py standard