The primary systems at different airports consist of two secondary radar systems , the `` large '' and the `` sophisticated '' surveillance radar . The primary systems at different airports consist of two secondary radar systems , the `` large '' and `` sophisticated '' surveillance radar .
Sistem primer di lapangan terbang yang berbeza terdiri daripada dua sistem radar sekunder, iaitu "besar" 'dan "sofistikated"'surveillance radar. Sistem primer di lapangan terbang yang berbeza terdiri daripada dua sistem radar sekunder, iaitu "besar" dan "sofistikated" "surveillance radar.