Ballistic measurement systems: measuring hit accuracy patterns (1973)

Measuring hit accuracy patterns (1973)

The Target Scoring System (TSS; TRA in Dutch) is an electronic recording device of hits at the target area for large-calibre projectiles. This equipment was developed by the TNO Physics Laboratory for the benefit of the Commission of Trails of the Royal Netherlands Army in 1973. From the angles at which both detectors observe the projectile and the known distance between the detectors, the position of the projectile in the target plane can be deduced. The control box sends this position to the registration station where it is recorded, together with the shot number (obtained by the acoustic detector).
The observation of birds, for example, is prevented by the shock wave detector which signals the arrival of a projectile on the control box.

In addition to this equipment, the museum also has a transmitting and receiving antennas belonging to the TSS, one of the two artificial light sources to use in case of insufficient daylight, one of the two hoods to be used to prevent sun in the lens, and one of the two rotating windshields beat the rain.

Schematic arrangement of the TSS
The schematic arrangement of the TSS

 

Detection fields of the TSS detectors
The detection fields of the TSS detectors

 

Scale model of the Target Scoring System (TSS) setup
Scale model of the Target Scoring System (TSS) setup

 

Optical detector with alignment scope
Optical detector with alignment scope

 

Rotating window to beat the rain
Rotating window to beat the rain

 

Artificial light source for the TSS
The artificial light source for the TSS

 

Heavy-duty microphone for shot detection and initiating the recording
Heavy-duty microphone for shot detection and initiating the recording

 

TSS Control Unit
TSS Control Unit

Evaluation Goalkeeper

In 1984, the TSS was employed to evaluate the ‘Goalkeeper CIWS‘, a Naval seven-barrel weapon system to counter incoming missiles. Because of the very high firing rate of 4,200 shots a minute, the TSS had to be modified to be able to perform these measurements. Those measurements took place at Fort Erfprins, Den Helder over a length of 350 metres. The recordings were transmitted via a radio connection to the sea container with the processing equipment. The container that was set up just behind the Goalkeeper.

The goalkeeper
The goalkeeper

 

Target for the projectiles
Target for the projectiles

 

TRA setup for the evaluation of the Goalkeeper
TRA setup for the evaluation of the Goalkeeper