diff --git a/raillabel/json_format/stream_radar.py b/raillabel/json_format/stream_radar.py
new file mode 100644
index 0000000..6724e49
--- /dev/null
+++ b/raillabel/json_format/stream_radar.py
@@ -0,0 +1,46 @@
+# Copyright DB InfraGO AG and contributors
+# SPDX-License-Identifier: Apache-2.0
+
+from __future__ import annotations
+
+from typing import Literal
+
+from pydantic import BaseModel
+
+
+class JSONStreamRadar(BaseModel):
+    """A stream describes the source of a data sequence, usually a sensor.
+
+    This specific object contains the intrinsics of a radar sensor.
+    """
+
+    type: Literal["radar"]
+    "A string encoding the type of the stream."
+
+    stream_properties: JSONStreamRadarProperties
+    "Intrinsic calibration of the stream."
+
+    uri: str
+    "A string encoding the subdirectory containing the sensor files."
+
+    description: str | None
+    "Description of the stream."
+
+
+class JSONStreamRadarProperties(BaseModel):
+    """Intrinsic calibration of the stream."""
+
+    intrinsics_radar: JSONIntrinsicsRadar
+
+
+class JSONIntrinsicsRadar(BaseModel):
+    """JSON object defining an instance of the intrinsic parameters of a radar."""
+
+    resolution_px_per_m: float
+    "Number correlating pixel in the output image to a position relative to the sensor in meters."
+
+    height_px: int
+    "Height of the radar output in pixel."
+
+    width_px: int
+    "Width of the radar output in pixel."