Improve error handling in observation file decoding

src/rinex.py

@@ -281,9 +281,16 @@ def decode_obs(self, nav, maxepoch):
                     obs_ = line[16*i+4:16*i+17].strip()
                     if obs_ == '' or self.sigid[sys][i] == 0:
                         continue
+                    try:
+                        obsval = float(obs_)
+                    except:
+                        obsval = 0
                     f = i // (self.nsig[sys] // self.nband[sys])
+                    if f >= gn.MAX_NFREQ:
+                        print('Obs file too complex, please use RTKCONV to remove unused signals')
+                        raise SystemExit
                     if self.typeid[sys][i] == 0:  # code
-                        obs.P[n, f] = float(obs_)
+                        obs.P[n, f] = obsval
                         Pstd = line[16*i+18]
                         obs.Pstd[n, f] = int(Pstd) if Pstd != " " else 0
                     elif self.typeid[sys][i] == 1:  # carrier
@@ -293,9 +300,9 @@ def decode_obs(self, nav, maxepoch):
                         Lstd = line[16*i+18]
                         obs.Lstd[n, f] = int(Lstd) if Lstd != " " else 0
                     elif self.typeid[sys][i] == 2:  # C/No
-                        obs.S[n, f] = float(obs_)
+                        obs.S[n, f] = obsval
                     elif self.typeid[sys][i] == 3:  # Doppler
-                            obs.D[n, f] = float(obs_)
+                            obs.D[n, f] = obsval
                 n += 1
             obs.P = obs.P[:n, :]
             obs.L = obs.L[:n, :]

src/rtkpos.py

@@ -948,7 +948,7 @@ def relpos(nav, obsr, obsb, sol):
             nav.ns = len(ix)
 
     # resolve integer ambiguities
-    if nav.armode > 0:
+    if nav.armode > 0 and stat != gn.SOLQ_NONE:
         nb, xa = manage_amb_LAMBDA(nav, sats, stat, posvar)
         if nb > 0:
             yu, eu, el = zdres(nav, obsr, rs, dts, svh, var, xa[0:3], 1)