ODZ-UJF-AV-CR / balon

Semicoductor Cosmic ray detector High-altitude balloon experiment.
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Test dosahu LoRa telemetrie #29

Closed kaklik closed 4 years ago

kaklik commented 5 years ago

Dosah nového telemetrického rozhraní za použití LoRa #26 je před letem potřeba ověřit.

Ověření by bylo nejlepší realizovat vynesením gondoly s vysílačem do výšky třeba multikoptérou a otestováním, kolik pozemních stanic modem uvidí.

kaklik commented 4 years ago

Telemetrii jsme otestavali na louce ve Zdibech u Prahy, tak že kompletní gondola balonu byla vynesena multikoptérou do ~100m nad terén.

Výsledkem bylo, že LoRa telemetrické packety přijmulo až 9 stanic najednou.

{
  "time": "2019-11-27T11:31:59.305413666Z",
  "frequency": 868.1,
  "modulation": "LORA",
  "data_rate": "SF7BW125",
  "coding_rate": "4/5",
  "gateways": [
    {
      "gtw_id": "kaple_czela_net",
      "gtw_trusted": true,
      "timestamp": 562207907,
      "time": "2019-11-27T11:31:59Z",
      "channel": 0,
      "rssi": -117,
      "snr": -7.5,
      "rf_chain": 1,
      "latitude": 50.16404,
      "longitude": 14.746259
    },
    {
      "gtw_id": "eui-b827ebfffeae70f3",
      "timestamp": 4098427083,
      "time": "2019-11-27T11:31:59.289896Z",
      "channel": 0,
      "rssi": -118,
      "snr": -6.5,
      "rf_chain": 1,
      "latitude": 50.202152,
      "longitude": 14.485833,
      "altitude": 220,
      "location_source": "registry"
    },
    {
      "gtw_id": "eui-3234333659005300",
      "timestamp": 2834002435,
      "time": "",
      "channel": 0,
      "rssi": -116,
      "snr": -5.25,
      "rf_chain": 1,
      "latitude": 50.234993,
      "longitude": 14.382529,
      "location_source": "registry"
    },
    {
      "gtw_id": "frantovo-cz-1",
      "gtw_trusted": true,
      "timestamp": 1579168811,
      "time": "2019-11-27T11:32:04Z",
      "channel": 0,
      "rssi": -111,
      "snr": -1.75,
      "rf_chain": 1,
      "latitude": 50.1478,
      "longitude": 14.481508,
      "altitude": 265,
      "location_source": "registry"
    },
    {
      "gtw_id": "cesgw3",
      "gtw_trusted": true,
      "timestamp": 2640635971,
      "time": "2019-11-27T11:32:51.512585999Z",
      "channel": 0,
      "rssi": -106,
      "snr": 0.75,
      "rf_chain": 1,
      "latitude": 50.053925,
      "longitude": 14.427589,
      "altitude": 271
    },
    {
      "gtw_id": "eui-84eb18fffee53ed8",
      "timestamp": 1496433019,
      "time": "2019-11-27T11:31:59.292919Z",
      "channel": 0,
      "rssi": -113,
      "snr": 3.8,
      "rf_chain": 1
    },
    {
      "gtw_id": "eui-689e19fffe8e8c36",
      "timestamp": 3565584539,
      "time": "2019-11-27T11:31:59.290652Z",
      "channel": 0,
      "rssi": -109,
      "snr": 5,
      "rf_chain": 1
    },
    {
      "gtw_id": "eui-84eb18fffee25bc4",
      "timestamp": 2069632979,
      "time": "2019-11-27T11:31:59.288864Z",
      "channel": 0,
      "rssi": -101,
      "snr": 8.2,
      "rf_chain": 1
    },
    {
      "gtw_id": "eui-b827ebfffe776a41",
      "timestamp": 3380676411,
      "time": "2019-11-27T11:31:59.291756Z",
      "channel": 0,
      "rssi": -96,
      "snr": 9.8,
      "rf_chain": 1,
      "latitude": 50.09454,
      "longitude": 14.38547,
      "altitude": 275
    }
  ]
}

Některé stanice jsou navíc relativně vzdálené, z čehož lze usuzovat, že vyzařovací charakteristika antén a parametry vysílání (SF7) jsou dostatečné.