CONSTANT CHANNELS

Author: haraschax

laika/astro_dog.py

@@ -296,12 +296,6 @@ def get_all_sat_info(self, time):
 
     return {prn: eph.get_sat_info(time) for prn, eph in ephs.items()}
 
-  def get_glonass_channel(self, prn, time):
-    nav = self.get_nav(prn, time)
-    if nav:
-      return nav.channel
-    return None
-
   def get_frequency(self, prn, time, signal='C1C'):
     if get_constellation(prn) == ConstellationId.GPS:
       switch = {'1': constants.GPS_L1,
@@ -315,7 +309,7 @@ def get_frequency(self, prn, time, signal='C1C'):
         return freq
       raise NotImplementedError("Dont know this GPS frequency: ", signal, prn)
     elif get_constellation(prn) == ConstellationId.GLONASS:
-      n = self.get_glonass_channel(prn, time)
+      n = constants.GLONASS_CHANNELS[prn]
       if n is None:
         return None
       switch = {'1': constants.GLONASS_L1 + n * constants.GLONASS_L1_DELTA,

laika/constants.py

@@ -32,3 +32,34 @@
 SECS_IN_DAY = 24*SECS_IN_HR
 SECS_IN_WEEK = 7*SECS_IN_DAY
 SECS_IN_YEAR = 365*SECS_IN_DAY
+
+
+# Glonass channel have not changed between 2018 and 2025 for sats 1-24, assume constant
+GLONASS_CHANNELS = {
+                    "R01": 1,
+                    "R02": -4,
+                    "R03": 5,
+                    "R04": 6,
+                    "R05": 1,
+                    "R06": -4,
+                    "R07": 5,
+                    "R08": 6,
+                    "R09": -2,
+                    "R10": -7,
+                    "R11": 0,
+                    "R12": -1,
+                    "R13": -2,
+                    "R14": -7,
+                    "R15": 0,
+                    "R16": -1,
+                    "R17": 4,
+                    "R18": -3,
+                    "R19": 3,
+                    "R20": 2,
+                    "R21": 4,
+                    "R22": -3,
+                    "R23": 3,
+                    "R24": 2,
+                    "R25": None,
+                    "R26": None,
+                    }