# at.adsb.receiver.sighting

> Published by [adsb.at](https://lexicon.garden/identity/did:plc:32thk4eifx4ou6mxevswgjhg)

✓ This is the authoritative definition for this NSID.

## Description

A batch of aircraft observations from a single receiver covering a configurable time window (default 60 seconds). Contains a manifest of observed aircraft and blobbed telemetry data.

## Links

- [View on Lexicon Garden](https://lexicon.garden/lexicon/did:plc:32thk4eifx4ou6mxevswgjhg/at.adsb.receiver.sighting)
- [Documentation](https://lexicon.garden/lexicon/did:plc:32thk4eifx4ou6mxevswgjhg/at.adsb.receiver.sighting/docs)
- [Examples](https://lexicon.garden/lexicon/did:plc:32thk4eifx4ou6mxevswgjhg/at.adsb.receiver.sighting/examples)

## Definitions

### `at.adsb.receiver.sighting`

**Type**: `record`

A receiver's batch sighting covering a configurable observation window.

**Key**: `tid`

| Property | Type | Required | Description |
|----------|------|----------|-------------|
| `manifest` | `array` | Yes | Lightweight list of all aircraft observed in this window. |
| `createdAt` | `string` (datetime) | Yes |  |
| `telemetry` | `blob` | Yes | Zstd-compressed JSON object keyed by ICAO hex, values are arrays of at.adsb.flight.defs#position objects. |
| `windowEnd` | `string` (datetime) | Yes | End of the observation window (exclusive). |
| `rawCapture` | `blob` | No | Raw demodulated SDR frames captured during this window, in ATRX envelope format. Optional — strengthens provenance but not required. |
| `windowStart` | `string` (datetime) | Yes | Start of the observation window (inclusive). |

### `at.adsb.receiver.sighting#manifestEntry`

**Type**: `object`

An aircraft observed in this batch window.

| Property | Type | Required | Description |
|----------|------|----------|-------------|
| `icaoHex` | `string` | Yes | ICAO 24-bit hex address (uppercased). |

## Raw Schema

```json
{
  "id": "at.adsb.receiver.sighting",
  "defs": {
    "main": {
      "key": "tid",
      "type": "record",
      "record": {
        "type": "object",
        "required": [
          "windowStart",
          "windowEnd",
          "manifest",
          "telemetry",
          "createdAt"
        ],
        "properties": {
          "manifest": {
            "type": "array",
            "items": {
              "ref": "#manifestEntry",
              "type": "ref"
            },
            "maxLength": 1000,
            "minLength": 1,
            "description": "Lightweight list of all aircraft observed in this window."
          },
          "createdAt": {
            "type": "string",
            "format": "datetime"
          },
          "telemetry": {
            "type": "blob",
            "accept": [
              "application/zstd"
            ],
            "maxSize": 2000000,
            "description": "Zstd-compressed JSON object keyed by ICAO hex, values are arrays of at.adsb.flight.defs#position objects."
          },
          "windowEnd": {
            "type": "string",
            "format": "datetime",
            "description": "End of the observation window (exclusive)."
          },
          "rawCapture": {
            "type": "blob",
            "accept": [
              "application/vnd.at-adsb.raw-capture+zstd"
            ],
            "maxSize": 2000000,
            "description": "Raw demodulated SDR frames captured during this window, in ATRX envelope format. Optional — strengthens provenance but not required."
          },
          "windowStart": {
            "type": "string",
            "format": "datetime",
            "description": "Start of the observation window (inclusive)."
          }
        }
      },
      "description": "A receiver's batch sighting covering a configurable observation window."
    },
    "manifestEntry": {
      "type": "object",
      "required": [
        "icaoHex"
      ],
      "properties": {
        "icaoHex": {
          "type": "string",
          "maxLength": 6,
          "minLength": 6,
          "description": "ICAO 24-bit hex address (uppercased)."
        }
      },
      "description": "An aircraft observed in this batch window."
    }
  },
  "$type": "com.atproto.lexicon.schema",
  "lexicon": 1,
  "description": "A batch of aircraft observations from a single receiver covering a configurable time window (default 60 seconds). Contains a manifest of observed aircraft and blobbed telemetry data."
}
```