Real Time Display Data Handling

The real time display (RTD) data are output by the IRIS system at the radar site, or directly by the RVP. Ray-by-ray output packets are sent over the network using UDP broadcast messaging.

Many workstations can monitor the RTD without placing any additional burden on the network traffic. You can tune the number of data parameters and range bins to match the available network bandwidth. For example:

• Transmitted parameters: Z, V, and W only (3 bytes)
• Number of bins: 500
• Scan rate 4 RPM: (24° per second)
• Scan resolution: 1°

In this case the data rate is 36 KBytes/sec or 288 kbps. This means that real time display can easily be done for Ethernet (10 mbps) or T1 (1 mbps) connections.

For slower connections, you must reduce the number of bins, increase the resolution, and/or slow the scan rate.

Note that the radar probably also sends processed or RAW products over the network link. You must consider the bandwidth requirement for these products.