eSlider
3deaa382e1
One process per drone: seeded patrol kinematics, sensor streams at realistic rates, detection events, hot current/ blocks sealed into Hive-partitioned Parquet, and the compact UDP state broadcast with peer RSSI derivation. Scales via docker compose --scale.
69 lines
2.4 KiB
Markdown
69 lines
2.4 KiB
Markdown
# Virtual drone fleet
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A data generator that exercises the **exact on-board pipeline** described in [03 — Data platform](../docs/03-data-platform.md): seeded kinematics along a patrol route, sensor streams at realistic rates, detection events, the hot `current/` → sealed Parquet write path, and the compact UDP state broadcast between drones.
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One process = one drone. Scaling the swarm is a Compose flag.
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## Run a swarm
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```bash
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# 5 drones (default), 2-minute flight, shared flight id
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FLIGHT_ID=$(date -u +%Y%m%dT%H%MZ)-sim docker compose up --build --scale drone=5
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# 10 drones, 5-minute flight, 4x accelerated
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DRONE_COUNT=10 DURATION_S=300 SPEEDUP=4 docker compose up --build --scale drone=10
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```
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Output lands in `./data/` with the standard layout:
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```
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data/dataset=telemetry/flight=…/drone=…/sensor=imu/year=…/…/hour=…/data.parquet
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data/dataset=detections/flight=…/drone=…/…
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data/dataset=state/flight=…/drone=…/… ← sent + received broadcasts
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```
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## Run a single drone without Docker
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```bash
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pip install -r requirements.txt
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DRONE_ID=dr-01 DURATION_S=30 SPEEDUP=10 DATA_DIR=./data python -m virtual_drone.main
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```
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## Query the results
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```bash
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python - <<'EOF'
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import duckdb
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con = duckdb.connect()
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print(con.sql("""
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SELECT drone, sensor, count(*) AS rows,
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to_timestamp(min(ts_ns)/1e9) AS first_row,
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to_timestamp(max(ts_ns)/1e9) AS last_row
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FROM read_parquet('data/dataset=telemetry/**/*.parquet', hive_partitioning=true)
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GROUP BY drone, sensor ORDER BY drone, sensor
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"""))
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print(con.sql("""
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SELECT drone, direction, count(*) AS frames, count(DISTINCT peer_id) AS peers
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FROM read_parquet('data/dataset=state/**/*.parquet', hive_partitioning=true)
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GROUP BY drone, direction ORDER BY drone, direction
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"""))
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EOF
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```
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## Reproducibility
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Every run is deterministic per `(SEED, DRONE_ID)`: same route jitter, same sensor noise, same detection sequence. A bug report is a seed and a config, not a description.
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## Knobs
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| Env | Default | Meaning |
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| --- | --- | --- |
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| `DRONE_ID` | derived from hostname | Unique per container automatically under `--scale` |
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| `FLIGHT_ID` | generated | Set explicitly so all drones share one flight partition |
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| `SEED` | `42` | Determinism root |
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| `DURATION_S` | `120` | Simulated flight length |
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| `SPEEDUP` | `1.0` | Wall-clock acceleration |
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| `IMU_HZ` | `50` | High-rate sensor load |
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| `STATE_HZ` | `5` | Broadcast frequency |
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| `AREA_SIZE_M` | `400` | Patrol square side |
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