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          High Frequency Design
          Defense Electronics



                      Addressing the Challenges of
                      Radar and EW System Design
                      and Test using a Model-Based
                      Platform
                      By Dingqing Lu, Agilent Technologies


                                               Radar systems have come a long way since their introduction in the
        Today's designers require          1940's, today encompassing a broad range of applications, ranging from
          a solution for designing,        supermarket door openers to highly complex shipboard phased-array
        verifying and testing their        fire-control radars. Modern systems require higher performance to work
         Radar and EW systems in           in today's ever more complex Electronic Warfare (EW) environments,
                 an effective way.         which include jamming and deception. As a result, EW systems must be
                                           properly designed to effectively attack Radar systems. Modern Radar and
                      EW systems must also have the ability to reach out and touch the environments in which they
                      operate, detect and characterize sources of electronic noise such as RF jamming or co-location
                      antenna interference, and adapt the Radar's performance accordingly to compensate for that
                      interference. Moreover, EW specifications are always adjusted based on the environment.
                      Because of these challenges, today's designers require a solution for designing, verifying and
                      testing their Radar and EW systems in an effective way.

                      Challenges
                          Radar and EW systems operate in increasingly complex spectral environments with multi-
                      emitter input signals from Radar, military and commercial communication systems, as well
                      as different interferences, noise and clutter. Even in an urban center, the airwaves may
                      include countless wideband RF and microwave emitters--and therefore, potential interfer-
                      ers--such as wireless communications infrastructure, wireless networking systems and civil-
                      ian Radars.
                          This complexity poses a number of challenges when developing Radar and EW systems,
                      especially when coupled with new signal generation and processing requirements, and the
                      need to analyze different test cases. For example, how does the engineer reduce the time and
                      cost associated with developing these new systems, while also reducing the high cost of test-
                      ing and validation? How do they get all legacy Intellectual Property (IP) point tools to work
                      together with RF? And, how do they validate the performance of their complex Radar and EW
                      systems earlier/continuously, instead of waiting until final integration and test? Addressing
                      these challenges is critical ensuring the success of any Radar or EW system.

                      Introducing the Model-Based Platform
                          One way to quickly and effectively deal with these challenges is through use of a model-
                      based platform. The platform relies on simulation of Radar and EW systems with cross domain
                      architectures for signal processing and RF pieces, and visualized environments. It can also link
                      to high-performance Commercial Off-the-shelf (COTS) instruments, connecting the real world
                      with "simulation in the loop" to achieve greater flexibility and application awareness. Using a
                      model-based platform to design, verify and test Radar and EW systems, designers can create

22   High Frequency Electronics
                                           High Frequency Design
                                           Defense Electronics




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