Ground Surveillance Radar

[Urban]

You have GSR but coded as FO/vehicle.

For example :
France oob
Unit 598 VAB RASIT (Radar d'Acquisition et de Surveillance des InTervalles, Acquisition and Interval Monitoring Radar)
Unit 547 VAB RATAC (Radar de Tir pour l'Artillerie de Campagne or Field Artillery Fire Finder Radar)

The RASIT is a GSR used in recon unit to detect, classify, ect
The RATAC is a Arty radar uised for detection of incoming shell, trajectory (not sure about this word), counter fire, and all stuff usefull for an arty unit.

Several type of GSR have been used :
OLIFANT (to 400m for a crawling man to 2600m for a vehicle)
OLIFANT II (maybe the same perf)
RASURA (to 1500m to 5000m)
RASIT (Edit, have found 23km and 40km for detection)

Of course other country using GSR :

USA, Russia, Germany, UK,... almost all country are using GSR