Add support for CIRBE

python/satyaml/CIRBE.yml

@@ -0,0 +1,21 @@
+name: CIRBE
+norad: 99401
+data:
+  &tlm Telemetry:
+    telemetry: cirbe_70cm
+transmitters:
+  9k6 FSK downlink:
+    frequency: 437.250e+6
+    modulation: FSK
+    baudrate: 9600
+    framing: AX.25 
+    data:
+    - *tlm
+  19k2 FSK downlink:
+    frequency: 437.250e+6
+    modulation: FSK
+    baudrate: 19200
+    framing: AX.25 
+    data:
+    - *tlm
+

python/telemetry/CMakeLists.txt

@@ -39,6 +39,8 @@ GR_PYTHON_INSTALL(
     binar1.py
     by02.py
     by70_1.py
+    cirbe_70cm.py
+    cirbe_bct_soh.py
     csp.py
     ctim_70cm.py
     cute_70cm.py

python/telemetry/__init__.py

@@ -25,6 +25,7 @@
 from .binar1 import binar1
 from .by02 import by02
 from .by70_1 import by70_1
+from .cirbe_70cm import cirbe_70cm
 from .csp import csp
 from .ctim_70cm import ctim_70cm
 from .cute_70cm import cute_70cm

python/telemetry/cirbe_70cm.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+
+# Copyright 2017, 2018, 2019, 2020 Daniel Estevez <daniel@destevez.net>
+# Copyright 2022 The Regents of the University of Colorado
+#
+# This file is part of gr-satellites
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
+
+from datetime import datetime
+from construct import Adapter, BitsInteger, BitStruct, Container, Enum, \
+                      Flag, GreedyBytes, If, Int8ub, Int16ub, Int32ub, \
+                      Padding, RawCopy, Struct, Switch
+from .ax25 import Header
+from .cirbe_bct_soh import cirbe_bct_soh
+
+
+PrimaryHeader = BitStruct(
+    'ccsds_version' / BitsInteger(3),
+    'packet_type' / Flag,
+    'secondary_header_flag' / Flag,
+    'is_stored_data' / Flag,
+    'APID' / BitsInteger(10),
+    'grouping_flag' / Enum(BitsInteger(2), GRP_MIDDLE=0, GRP_BEGIN=1,
+                           GRP_END=2, GRP_FIRST_AND_LAST=3),
+    'sequence_count' / BitsInteger(14),
+    'packet_length' / BitsInteger(16)
+)
+
+
+SecondaryHeaderRaw = Struct(
+    'time_stamp_seconds' / Int32ub,
+    'sub_seconds' / Int8ub,
+    Padding(1)
+)
+
+
+class TimeAdapter(Adapter):
+    def _encode(self, obj, context, path=None):
+        return Container()
+
+    def _decode(self, obj, context, path=None):
+        offset = datetime(2000, 1, 1, 12) - datetime(1970, 1, 1)
+        return (datetime.utcfromtimestamp(obj.time_stamp_seconds) + offset)
+
+
+SecondaryHeader = TimeAdapter(
+    SecondaryHeaderRaw
+)
+
+
+cirbe_70cm = Struct(
+    'ax25_header' / Header,
+    'primary_header' / PrimaryHeader,
+    'secondary_header' / If(
+        lambda c: c.primary_header.secondary_header_flag,
+        SecondaryHeader
+    ),
+    'packet' / Switch(
+        lambda c: c.primary_header.APID,
+        {
+            0x050: cirbe_bct_soh
+        }
+    )
+)