With an indigenous design and manufacturing capability, RSL is a major supplier of Monopulse Secondary Surveillance Radar (MSSR) systems, a technology pioneered by the company, especially in the application of monopulse reception techniques and the development of Mode S (Select).

Over 490 Raytheon solid-state MSSR systems have been ordered of which more than half are Mode S systems. Customers include major national Air Navigation Service Providers - such as DFS, the FAA, NATS, Nav Canada - as well as smaller, regional airport operators. Amongst military customers are the UK Ministry of Defence, US Department of Defense, the Royal Netherlands Air Force, Royal Australian Air Force and the Royal Danish Air Force.

RSL frequently participates as a key player in major programmes run by Raytheon Company in the provision of complete solutions for terminal and en route ATM requirements. Such programmes often involve a complete upgrade of customers' surveillance infrastructure with latest generation Mode S radar systems. Programmes have already been completed in the Netherlands, Germany, Switzerland, Hungary and Morocco, whilst others are in progress in Canada, Norway, the UAE, UK and USA.

Recently programmes have been completed in Oman, involving the provision of 4 en route MSSR systems, and in the UK with new radar systems for Robin Hood Airport Doncaster Sheffield and Liverpool John Lennnon Airport.