In December 2007, forward scatter to detect low observable targets.
2.
In the US, Forward Scatter RVRs are replacing transmissometers at most airports.
3.
Forward scatter sensors are more popular due to their lower price, smaller size and lower maintenance requirements.
4.
Bennett Lewis, head of the forward scatter bistatic radar, it used two antennas, a transmitter and receiver, separated by some distance.
5.
According to the US Federal Aviation Administration : " There are approximately 279 RVR systems in the NAS, of which 242 are forward scatter NG RVR Systems and 34 are older Transmissometer Systems ."
6.
The forward scatter sensor uses a beam of infrared light which is sent from one end of the sensor toward the receiver, but offset from a direct line to the receiver by a certain angle.
7.
Today most airports use " Instrumented Runway Visual Range " or IRVR, which is measured by devices called forward scatter meters which provide simplified installation as they are integrated units and can be installed as single unit ( s ) at a critical location along the runway or transmissometers which are installed at one side of a runway relatively close to its edge.
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