Add support for type 16 Long Special Surveillance packets. Not tested with real data.

lib/air_modes_slicer.cc

@@ -134,7 +134,7 @@ int air_modes_slicer::work(int noutput_items,
 			slice_result_t slice_result = slicer(in[i+j*2], in[i+j*2+1], rx_packet.reference_level);
 			if(slice_result.decision) pkt_hdr += 1 << (4-j);
 		}
-		if(pkt_hdr == 17 or pkt_hdr == 20 or pkt_hdr == 21) rx_packet.type = Long_Packet;
+		if(pkt_hdr == 16 or pkt_hdr == 17 or pkt_hdr == 20 or pkt_hdr == 21) rx_packet.type = Long_Packet;
 		else rx_packet.type = Short_Packet;
 		int packet_length = (rx_packet.type == framer_packet_type(Short_Packet)) ? 56 : 112;
 

python/msprint.py

@@ -55,8 +55,8 @@ class output_print(air_modes.parse):
         output += self.print11(data, ecc)
       elif msgtype == 17:
         output += self.print17(data)
-      elif msgtype == 20 or msgtype == 21:
+      elif msgtype == 20 or msgtype == 21 or msgtype == 16:
-        output += self.print20(data, ecc)
+        output += self.printTCAS(data, ecc)
       else:
         output += "No handler for message type %i from %x (but it's in modes_parse)" % (msgtype, ecc)
       return output
@@ -184,12 +184,18 @@ class output_print(air_modes.parse):
 
     return retstr
 
-  def print20(self, data, ecc):
+  def printTCAS(self, data, ecc):
     msgtype = data["df"]
-    if(msgtype == 20):
+    if msgtype == 20 or msgtype == 16:
+      #type 16 does not have fs, dr, um but we get alt here
       [fs, dr, um, alt] = self.parse4(data)
-    else:
+    elif msgtype == 21:
       [fs, dr, um, ident] = self.parse5(data)
+
+    if msgtype == 16:
+      bds1 = data["vds1"]
+      bds2 = data["vds2"]
+    else:
       bds1 = data["bds1"]
       bds2 = data["bds2"]
 
@@ -206,6 +212,10 @@ class output_print(air_modes.parse):
     elif bds1 == 3:
       retstr = "Type %i TCAS report from %x: " % (msgtype, ecc)
       tti = data["tti"]
+      if msgtype == 16:
+        (resolutions, complements, rat, mte) = self.parse_TCAS_CRM(data)
+        retstr += "advised: %s complement: %s" % (resolutions, complements)
+      else:
           if tti == 1:
             (resolutions, complements, rat, mte, threat_id) = self.parseMB_TCAS_threatid(data)
             retstr += "threat ID: %x advised: %s complement: %s" % (threat_id, resolutions, complements)
@@ -221,7 +231,7 @@ class output_print(air_modes.parse):
     else:
       retstr = "No handler for BDS1 == %i from %x" % (bds1, ecc)
 
-    if(msgtype == 20):
+    if(msgtype == 20 or msgtype == 16):
       retstr += " at %ift" % alt
     else:
       retstr += " ident %x" % ident

python/parse.py

@@ -193,6 +193,22 @@ class mb_reply(data_field):
 #                "vds": (33,8),  "vds1": (33,4), "vds2": (37,4)
 #              }
 
+class mv_reply(data_field):
+  offset = 33
+  types = { "ara": (41,14), "mte": (60,1),  "rac": (55,4), "rat": (59,1),
+            "vds": (33,8),  "vds1": (33,4), "vds2": (37,4)
+          }
+
+  def get_type(self):
+    vds1 = self.get_bits(33,4)
+    vds2 = self.get_bits(37,4)
+    if vds1 not in (3,) or vds2 not in (0,):
+      raise NoHandlerError(bds1)
+    return int(vds1)
+
+  def get_numbits(self):
+    return 56
+
 #the whole Mode S packet type
 class modes_reply(data_field):
   types = { 0: {"df": (1,5), "vs": (6,1), "cc": (7,1), "sl": (9,3), "ri": (14,4), "ac": (20,13), "ap": (33,24)},
@@ -404,3 +420,8 @@ class parse:
     (resolutions, complements) = self.parseMB_TCAS_resolutions(data)
     threat_alt = decode_alt(data["tida"], True)
     return (resolutions, complements, data["rat"], data["mte"], threat_alt, data["tidr"], data["tidb"])
+
+  #type 16 Coordination Reply Message
+  def parse_TCAS_CRM(self, data):
+    (resolutions, complements) = self.parseMB_TCAS_resolutions(data)
+    return (resolutions, complements, data["rat"], data["mte"])