Add radar_node.md

doc/perception/radar_node.md

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+# Radar Node
+
+**Summary:** This page explains what the radar sensor does.
+
+- [Radar offsets](#radar-offsets)
+- [Radar specification](#radar-specification)
+- [Radar data output for each detected point](#radar-data-output-for-each-detected-point)
+- [Todo](#todo)
+
+## Radar offsets
+
+- x: 2
+- y: 0
+- z: 0.7
+
+## Radar specification
+
+- points per second: 1500 points generated by all lasers per second
+- maximum range: 100 meters
+- horizontal fov: 30 degrees
+- vertical fov: 30 degrees
+
+## Radar data output for each detected point
+
+- x
+- y
+- z
+- Range
+- Velocity
+- AzimuthAngle
+- ElevationAngle
+
+## Todo
+
+- Discuss further processing of radar data
+- Combine lidar, radar and camera data