System Accuracy
System accuracy is typically better than a microwave surveillance radar, and is a function of the deployment geometry, the inherent timing accuracy of the central site, the bandwidth of the pulse being detected and the signal-to-noise ratio. Wider separations of the side sites from the central site provide better accuracies – but at the expense of a reduced area of common coverage. Typically side sites are deployed 15-40 km from the central site, providing a reasonable compromise of coverage and accuracy.
The system is generally line-of-sight limited, with a nominal range of 450 km, the normal radio horizon. Detection of targets is within a sector of approximately 120 degrees, although IFF and SSR targets are detected using a dedicated omnidirectional antenna, and hence may be seen over 360 degrees. Up to 200 targets can be automatically tracked simultaneously, with an output rate adjustable from 1 to 5 seconds.
Read more about this topic: VERA Passive Sensor
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—Thomas Henry Huxley (1825–95)