German research organization Fraunhofer Gesellschaft has developed and presented an over-the-air (OTA) wave-field synthesis system for test and certification of GNSS receivers. The testing platform is at its Fraunhofer IIS Facility for Over the Air Research and Testing (FORTE) in Ilmenau, Germany. The innovative and complex OTA test system is based on hardware and software solutions from IZT GmbH, such as powerful RF receivers and high-performance signal generators. The demonstrated setup to test GNSS receivers represents a new approach that — in contrast to conventional conducted and open-field tests — realistically emulates real-world scenarios under controllable and repeatable conditions, enabling the realistic comparison of receivers and algorithms. The OTA test system is cost-effective, flexible and scalable. The newest generations of mobile communication systems employ multiple antennas for transmission and reception, such as LTE, LTE-A, WIMAX and Wireless LAN. Multiple Input Multiple Output (MIMO) OTA test systems are typically deployed for certification, performance testing and product evaluation of broadband wireless devices. The related devices have to be tested in their related environments. In contrast to mobile phones, GNSS receivers are extremely susceptible to all types of interference. Hence, the goal was to develop a new testing method for interference robustness of GNSS receivers. The OTA Test Approach The OTA test laboratory comprises a satellite signal emulator (Spirent) used as signal source, several OTA channel emulators used for wave-field synthesis that are able to emulate any electromagnetic environment in an anechoic chamber, and several OTA illumination antennas. The OTA channel emulators from IZT GmbH support 8 input and 32 phase coherent output channels (up to 256 logical channels) in the frequency range of 1 to 6 GHz, and provide the output signals to the OTA illumination antennas. Note that the final extension of the system based on the IZT components will have 12 x 32 channels. The unique test environment developed at FORTE together with IZT GmbH excels in its great flexibility regarding possible applications in communications technology. The new OTA emulation approach enables realistic radio channel emulation taking into consideration multipath propagation, multi-frequency, and multi-user scenarios. The OTA system supports emulation of complex channel impulse responses of nearly unlimited length. Besides GNSS equipment, the test system can be applied for LTE and Cognitive Radio (CR), sensor networks (including energy networks and smart metering) or car-to-car and car-to-infrastructure communications. The Innovationszentrum für Telekommunikationstechnik GmbH IZT is a spin-off of the Fraunhofer-Gesellschaft, Germany’s leading institution for applied research. Founded in 1997 in Erlangen, the company emanated from the Fraunhofer Institute for Integrated Circuits (IIS). It specializes in advanced digital signal processing and field programmable gate array (FPGA) designs in combination with high-frequency and microwave technology.
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