“Marker” range-difference system for location of air objects
“Marker” system is designated for detection, positioning and individual recognition of aerial civil and military objects by their IFF/SIF on-board transponder signals by range-difference method.

Main technical characteristics
| No | Parameter | Value | 
| 1 | Received signals’ frequency, MHz | 1090 | 
| 2 | Synchronization of peripheral stations | by GPS 
 | 
| 3 | Communication between the main and peripheral stations | Ethernet (fibreoptics), wireless network | 
| 4 | Air object positioning error | maximum 1 % of the air object range, depends on system topology | 
| 5 | Detection range for 10 km altitude of air objects (provided there is line-of-sight between the four peripheral stations’ antennas and the air object) | 350 km | 
| 6 | Detection range for 1 km altitude of air objects (provided there is line-of-sight between the four peripheral stations’ antennas and the air objects) | 100 km | 
| 7 | Individual air object recognition | by air object transponder signals, w/o decoding in «S» mode | 
| 8 | Possibility of obtaining semantic information 
 | in «A, С, S» modes | 
| 9 | Positioning military air objects through multilateration (provided there is line-of-sight between the four peripheral stations’ antennas and the air object) | in «1, 2, 3, 4» IFF/SIF modes | 
| 10 | Positioning civil air objects through multilateration (provided there is line-of-sight between the four peripheral stations’ antennas and the air object) | in «А, С, S» IFF/SIF modes | 
| 11 | Design version | Transportable | 
 
        
 
                               
                          