Inside GNSS Media & Research

JUL-AUG 2018

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18 InsideGNSS J U L Y / A U G U S T 2 0 1 8 sponsored by Excellence in GNSS Simulation Products T he grow ing dependency on and increa sed application of Global Navigation Satellite System (GNSS) signals carries with it a parallel concern about intentional or unintentional in- terference. In today's environment, the Controlled Reception Pattern Antenna (CRPA) array is considered the best pro- tection against jamming vulnerability. While the development of CRPA arrays is a mature field, testing CRPA-equipped GNSS receivers under the changing threat environments is still a challenge because of the many external factors that affect navigational accuracy—until now. The first-of-its kind CAST 5000 GPS Wavefront Generator is a next generation simulator able to produce multiple coher- ent GPS signals, thus facilitating the cap- ture and elimination of interference sig- nal wavefronts within a CRPA-equipped receiver. E VOLUTIONARY ADVANCEMENT First integrated with GNSS receivers in the 1980s, CRPA arrays are ideally de- signed to process, phase-shift and com- bine signals (gains and nulls) in the array radiation pattern to reject out-of-phase signal combinations. The more antenna el- ements that are available, the more chance there is to prevent jamming. The number of antenna elements within a CRPA array and the need to evaluate coher- ent interference sig n a l s l i m it reliable testing options for verifying CRPA performance under var- ied conditions. The conventional approach to perfor- mance testing, antenna integration and validation of a CRPA-equipped GNSS re- ceiver is a dynamic physical f light test on a range with a vehicle and jamming sys- tems or access to an anechoic chamber to test the antenna, electronics and receiver. While effective, these practices are time consuming, labor intensive and can limit the practitioners' ability to simulate and mitigate real-world threats. Historically, GNSS simulators capable of testing CRPA-enabled receivers have had limited appeal because they typically aren't able to produce all coherent inter- ference signals that can be counter-acted by a CRPA. For effective CRPA-equipped receiver testing, the simulator must have the ability to tailor each error source to a simulation as required. Enter the high-accuracy, high-per- formance CAST 5000 GPS Wavefront Generator, which simulates the signals so the CRPA, antenna electronics and the GPS receiver can be tested as a unit while specify- ing interference levels and signal transition. CUSTOMIZED FOR CONTINUITY As a 6-degree-of-freedom (DOF) motion generator, the CAST 5000 operates in ei- TEST YOUR INTERFERENCE BOUNDARIES CAST 5000 simulator replicates end-to-end CRPA signal wavefronts in jamming environments CAST 5000 GPS Wavefront Generator

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