hava hedeflerinin tespiti için yakın gerçek zamanlı çoklu frekans destekli pasif radar sisteminin geliştirilmesi

Burak Tüysüz
2018 Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi  
Highlights: Graphical/Tabular Abstract  Development of open source code PIRE passive radar system  Near real time operation  Multi-frequency support In this study, PIRE, multi-frequency band supported open source passive radar system is developed for detecting aerial targets. The frequency and time synchronization of the multi-static system is provided by the global positioning system (GPS) receivers. Also, the employed software defined radio (SDR) technology provides the required
more » ... to the system to be used with FM radio, GSM, Wi-Fi and TV transmitters. Initial tests of the proposed system are performed by employing a commercial FM transmitter as the "transmitter of opportunity" in which the system successfully operated near-real time. Figure A. Generated Range-Doppler frequency surfaces from the near-real tine operation of the PIRE system which demonstrates a detected commercial plane flying nearby Purpose: The purpose of this study is to develop an open source platform for a multi-static passive radar system that can operate on different frequency bands with various transmitters. For this reason, the RF front end of the system is kept as simple as possible and the required processing blocks are implemented in the software. Theory and Methods: The developed PIRE system adopts SDR technology for easy adaptation to different frequency bands. The multi-static operation is supported by synchronizing spatially separated receivers with GPS receivers and the least squares method is used in the system for direct signal suppression. Additionally, the signal processing blocks are realized in a parallel manner to provide near real time operation. Results: The developed system is tested by employing an available commercial FM transmitter which is 89.6 km far from the reference receiver. Two separate systems are used for the collocated reference and the surveillance receivers for testing of multiple receiver synchronization. In the presented range-Doppler frequency surfaces, two aerial targets are detected at 20km and 50km slant ranges which are approximately 12 dB above the ground clutter. Conclusion: In this study, a multi-channel, flexible and cost-effective passive radar system has been developed by using SDR technologies. The software and hardware components of the PIRE passive radar system have been explained and the performance has been tested by detecting aerial targets. Also, the source codes of the PIRE system software is shared for training, repetition and continuous improvement.
doi:10.17341/gazimmfd.416478 fatcat:k7g3vo3rmvcoxkgfb57iufdoxa