This can provide high accuracy with small and fast projectiles. However its solution's stability is affected by trajectory dynamics, warhead bursts, and direct hits. To date, only the ARMS system has completed an extensive formal validation programme. As an example, its performance specification is shown in Table 1. These radar systems provide the mainstream solutions for vector missile scoring.
Passive optics is also an attractive technology for tracking high-speed objects.
Target mounted video cameras have also been used successfully to provide a qualitative indication of the trajectory and attitude of the missile. Acoustics provides a possible solution by measuring the arrival of the shock wave as a supersonic missile passes. However, it is clearly possible for the sensor to be destroyed before any information is obtained, which is unacceptable where detailed hit information is required. Scalar scorers are still in wide usage today, since they are relatively cheap, can score a wide range of projectiles including bullets, shells and missiles, and can be fitted to almost any size of target. The only limit on the size of target is the space available for the sensor within the target, and its transducer on the exterior of the target.