|FFI-project 798, “Anti-Armour Weapons beyond 2000” has performed a study on active protection systems (APS). As
part of this work, this report discusses the performance of radars.
First the report presents requirements for an APS-system to be effective against various threats. On the basis of simple
radar theory, which is described in some detail, a comparison between requirements and potential radar performance has
been carried out.
We found that a reasonably cheap 5GHz radar can detect threats at a range of 3000 m, even under adverse weather
conditions. The resolution is, however, poor, and the radar can not determine whether one or several objects are
approaching. A more expensive radar, with frequency 30GHz or more, has to be used for tracking. All in all radar is
under most conditions well suited for use in most APS-systems. Radars might, however, have problems when exposed
to jamming. A stationary jammer blinded all investigated frequencies, with the exception of 60GHz. When the jammer
was co-located with the threat, and hence approaching the radar, the results were even worse. For frequencies of 5, 30,
60 and 100GHz we then found, under our assumptions, a detection range of less than a meter. The simultaneous use of
several different types of sensors might reduce the effect of such jamming.