Jindalee Over the Horizon Radar
Jindalee is an Aboriginal word for a place [the] eye cannot see, or somewhere beyond where the eye can see, like over the horizon. The original project to develop an over-the-horizon radar in Australia was called Jindalee and the operational outcome of that project called JORN (Jindalee Operational Radar Network) continues the use of the iconic name Jindalee.
Over-the-horizon radar operated in the 'High Frequency' frequency band, unlike conventional radars which operate in the microwave band. The signals are bounced off the underside of the ionosphere to the target and back by the same route. Powerful computers analyse the returned signals to provide useable data.
Australia has been a leader in the development of the technology and the JORN system, operated by the Royal Australian Air Force, with a coverage of over thirteen million square kilometres to the north and west of Australia is the most advanced such system now in operation. The radar receives returns from aircraft and ships in its target area.
The Defence Science and Technology Organisation carried out its first research into the system in the early 1950s. The Jindalee Projects (Stages A & B) from 1970 to 1982 demonstrated the success of the Australian technology and research continues to improve the system's performance. The ultimate range and performance of the radars are classified however publicly available from the RAAF and other sources give an insight into a very powerful surveillance system.
The development of Jindalee was not subjected to much public scrutiny as the development was so successful, To this day few Australians are aware of the capabilities of JORN and its ever-vigilant surveillance of Australia's Northern Approaches.
Engineering Heritage Recognition Program
| Marker Type | Engineering Heritage International Marker (EHIM) |
| Award Date | May 2016 |
| Heritage Significance | The Jindalee Operational Radar Network is one of Australia's quietest achievers. It is an astounding system, the most capable radar network in the world. All Australian designed and built, and should be acknowledged as one of Australia's finest defence technology achievements. |
| Nomination Document | Available here. |
| Ceremony Booklet Ceremony Report |
Not Available |
| Plaque/Interpretation Panel Image | VIRTUAL INTERPRETATION site. There was no unveiling ceremony. |
