PERIMETER

PERIMETER (ПЕРИМЕТР) is the primary domestic component of the D'Runia Integrated Radar Defence System (Arvorian: Интегрированная система радиолокационной защиты Д'Руния, Hallisised: Integrirovannaya sistema radiolokatsionnoy zashchity D'Runiya, ИсрзД or ISRZD), the national air-defence network of Arvor. It consists of a combination of hardened ground-based and mobile, tactical radar sites supplemented by airbourne early warning and control aircraft and naval vessels, all interconnected by the secure ELEKTRON (ЭЛЕКТРОН) military telecommunications satellite network, which allows both digital data and voice communications to be sent using an encrypted military grade version of the Grid (Сетка, Setka) e-terminal network and processed by the AURORA (АВРОРА) computer system. In modern times, the network operates 18 monitoring stations using the P-53 Crystal (Кристалл) long-range radar system, which is specifically designed to be resistant to jamming. Additional coverage can be provided by mobile the P-62a Speculum (Зеркало) intermediate-range radar system, several of which are stationed strategically throughout the country. This system is supplemented by the ORLETS (ОРЛЕЦ) satellite constellation, that component of ISRZD which provides early warning and missile tracking and monitoring capabilities.

The entire network is co-ordinated through the Aerospace Defence Command of the Arvorian Air Force from the Mount Yarokovo complex in Tura Oblast in central southern Arvor.