Add qb50 decoder

db/base/decoders/qb50.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+from datetime import datetime, timedelta
+
+EPOCH_DATE = datetime.strptime('20000101T000000Z', '%Y%m%dT%H%M%SZ')
+
+
+def decode_payload(payload, observation_datetime, data_id):
+    dt = payload[:32]
+    datasets = payload[32:]
+
+    # calculate initial datetime
+    seconds = int(dt[24:] + dt[16:24] + dt[8:16] + dt[:8], 2)
+
+    telemetry = []
+
+    while datasets:
+        dataset = datasets[:57]
+        datasets = datasets[57:]
+
+        dataset_datetime = EPOCH_DATE + timedelta(seconds=seconds)
+        seconds += 60
+        satellite_datetime = datetime.strftime(dataset_datetime, '%Y%m%dT%H%M%SZ')
+
+        # mode
+        status = dataset[0]
+
+        # battery voltage
+        u = float(int(dataset[1:9], 2))
+        bat_v = round((u + 60) / 20, 2)
+
+        # battery current
+        u = float(int(dataset[9:17], 2))
+        bat_c = round((u - 127) / 127, 2)
+
+        # 3v3 current
+        u = float(int(dataset[17:25], 2))
+        v3_c = round(u / 40, 2)
+
+        # 5v current
+        u = float(int(dataset[25:33], 2))
+        v5_c = round(u / 40, 2)
+
+        # temperature comms
+        u = float(int(dataset[33:41], 2))
+        comms_t = round((u - 60) / 4, 2)
+
+        # temperature eps
+        u = float(int(dataset[41:49], 2))
+        eps_t = round((u - 60) / 4, 2)
+
+        # temperature battery
+        u = float(int(dataset[49:], 2))
+        batt_t = round((u - 60) / 4, 2)
+
+        data = {
+            'satellite_datetime': satellite_datetime,
+            'observation_datetime': observation_datetime,
+            'data_id': data_id,
+            'damod_data': {
+                'status': status,
+                'bat_v': bat_v,
+                'bat_c': bat_c,
+                'v3_c': v3_c,
+                'v5_c': v5_c,
+                'comms_t': comms_t,
+                'eps_t': eps_t,
+                'batt_t': batt_t
+            }
+        }
+
+        telemetry.append(data)
+        return telemetry