Green Archer (radar)

Finding was made a bit easier if the beam cone had a large angle, the problem with this was that it reduced the accuracy of location.

The key advance in tracking mortar shells was the Foster scanner, a type of radar antenna.

Any object in the scanner's view would appear on the display each time the beam crossed its horizontal bearing.

Green Archer solved this problem by quickly moving the antenna between two set vertical angles.

He then pressed a button that quickly raised the scanner so it was pointed at a higher vertical angle.

This happened rapidly enough that the bomb would take some time to reach this higher altitude, at which point it would appear on the display again and this second location would also be marked.

The radar could also be used "in reverse" to observe and adjust mortar fall of shot and that of guns firing in high angle.

British Green Archers were successfully used on operations in Borneo, South Arabia and Oman against mortars and for border surveillance in Hong Kong.

[6] [7] In addition to the UK, Green Archer was used by the armies of Germany, the Netherlands and Denmark (all self-propelled, mounted on an M-113 chassis), Italy, Israel, South Africa, Sweden, and Switzerland.

A radar trailer is complete with all computer units in the South Yorkshire Transport Museum in Rotherham.