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Radar Doppler Multifunction
The RDM (Radar Doppler Multifunction), also known as the Cyrano 5, is a French multimode pulse-Doppler radar developed by Thomson-CSF (now Thales) for export variants and early French models of the Mirage 2000 fighter aircraft. It is an evolution of the Cyrano IV installed on the Mirage F-1 and in turn was developed into the RDI (Radar Doppler à Impulsions), a specialist air-to-air radar for French Mirage 2000 interceptors, and the multimode RDY (Radar Doppler Multitarget), which could track more targets at a time and added further air-to-ground modes.
==History==
The first prototype of the RDM flew in January 1980 and production deliveries began in early 1983. Thomson funded development of the RDM from the Cyrano IV at a cost of FFr350m (~US$50m); the RDI air intercept derivative was funded by the French government.〔 The RDM was intended for export Mirage 2000's and the first 50 for the French Air Force; the remaining 150 French Mirage 2000C's would have the RDI.〔 In the end only 37 aircraft were fitted with the RDM, the first production RDI was delivered in December 1986. The two radars are interchangeable in the aircraft but have little in common electronically; the biggest difference is that the RDI increases the look-down/shoot-down range in pulse doppler mode from to ,〔 and supports the improved Super 530D missile. Allegedly the French Air Force would have preferred to wait until the RDI was ready and have an all-RDI fleet, but the government insisted that they take aircraft with RDM so that it could be marketed abroad as the front-line radar of France.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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