Feasibility Study Measuring Facility for EW-Direction Finders of the Royal Dutch Army,

The Royal Dutch Army has the need for measuring the accuracy of the EW direction finders of the ground based EW system. The intention is to inspect the direction finding accuracy of the operational direction finders periodically every 1 or 2 years. In addition the mobil direction finders will be inspected once every four years. Extensive measurements gave an insight in the feasibility of the development of a practical measurement facility. This report describes the preparations and results of this period of measurements which is held in May 1994 on the TNO-FEL test-site. During the measurement period, the obtained results show quite large errors in bearing. The bearing error were not so much dependent on the used receiver or transmitter power, but much more of the used transmitter frequency. Because of the unexpected errors in the measurement results the main goal, setting up an accurate calibration test site, is unrealistic for the TNO test site. In order to get a better insight in the performance of the land based direction finder in the future, it is necessary to test these systems in different environments.