In 1961, research started on the possibilities to use
digital techniques. Experiments comprised different port switching techniques,
adders, logic circuits, shift circuits and so on.
THe LEOK used components that were manufactured by other laboratories (e.g. the Physics Laboratory of the 'RijksverdedigingsOrganisatie TNO' (RVO-TNO) and NATO's Shape Technical Centre (STC)).
In 1962, the experience was used in a project for the
Royal Netherlands Army.
The LEOK was developing a 'vehicle test hardware unit',
that could measure different vehicle characteristics
(velocity, accelleration, brake distance). The facility could be used to
calibrate other distance and velocity meters.
The information stemming from an impuls signal was processed by digital circuits based upon Philips circuitry components.
Many lessons were learned about 'timing'-problems in digital circuits and how designs had to take these effects into account.
Improvements in the circuitry timings were made in the next project for
the Royal Netherlands Air Force (KLu).
The project which started in January, 1963, aimed to automate the altimetry in a navigation station of the KLu. The resources of the total RIVA (Radar Informatie Verwerkende Apparatuur = Radar Information Processing Equipment) project was quite large for the Laboratory, as it involved resources from both system and techology oriented groups.
The processing of the video-integrated information from the radar and the generation of control signals for the VI-antenna was done in a digital calculator.
The 'follow-up' of the RIVA-project was the 3D-simulator project for the Royal Netherlands Navy (period 1965 till 1970). The simulator had to inject simulated targets as well as clutter in the 3D-radar.
The simulator was used until 1975. A detailed description of the system concept can be found in ROERING, 10, 2, December 1973, pp. 64-77.
For the realisation of the simulator, a Ferranti computer was rented; this Hermes-computer ('germanium-logica') was installed in the beginning of 1966 and was in use till the mid of 1967. This system can be regarded as the first real general purpose computer on which LEOK programs were executed.