Sample Window Time and PRF Graphical User Interface

24 Figure 7. Stripmap Geometry SAR result Baseband signal reference to be transmitted is shown in figure 8 which has Mz bandwidth bilinear chirp signal inphase and quadrature. Figure 8. Signal Transmitted Reference The backscattered signal raw data from fpgaPC through gigabit ethernet can be shown in figure . t is delayed form of Tx signal due to target distance from UAV and added random noise function. 2 Figure 9. Signal Transmitted Reference The matched filter signal is convolution signal reference and signal received as can be shown in figure . Figure . Matched Filter Result t is clear that target can be detected using matched filter.

4. Result Analysis

Antenna as SAR sensor mount on JX‐ has length dimension = . meter and antenna width dimension . meter. These parameter will lead dB beamwidth in asimuth and 2 range as . O and . O respectively. n order to reach O to O incident angle of image the look angle of antenna should be adjust to . O inside JX fuselag. UAV JX will fly at meter low altitude, with s Pulse repetition frequency PRF . The PRF value is higher than PRF minimum limitation s due to cruise speed of JX at kmh antenna length . meters. n addition chirp signal has very high bandwith Ms in order to get sub meter range resolution. This Single polarisation system C Band SAR will provide in‐phase and quadrature signal with bit resolution ADC and Gsps. At this low altitude SAR geometry the receiving window time will be very short only µS. Raw data collected each pulse will be bit, then they will be delivered to laptop hardisk by gigabit ethernet UDP in order to be saved to hardisk. The transfer time of raw data to laptop only µS or . from PR, which is very enough transfer time in one pulse. This low altitude SAR operation will be collected data for seconds continuously for 8 meter flight distance, with PRF it will collect Mbytes which is enough space for external RAM of FGPA to buffer all measurement data. 5. Conclusion Network based data acquisition of C band CP‐SAR sensor on UAV was described. ardware in the loop test also was done for low altitude UAV operation for ensure that the system working well. From the result and discussion it is ready for test using real embedded system in near future for natural disaster monitoring. Acknowledge Thank you for reseach support from Riset‐Pro Ristek‐Dikti ndonesia and collaboration research team in JMRSL Ceres Chiba University for this research project. References Bayuaji et al. . ALOS PALSAR D‐nSAR for Land Subsidence Mapping in Jakarta, ndonesia. Canadian Journal of Remote Sensing. Vol. , No. , pp. ‐8. Fikar et al. . A Decision Support System for Coordinated Disaster Relief Distribution. Expert System With Application ‐ . Freeman and S. Saatchi. . On The Detection of Faraday Rotation in Linearly Polarized L‐ Band SAR Backscatter Signature. EEE Transactions On Geoscience And Remote Sensing, Vol. . No. 8. Jonan. . Pengendalian Pengoperasian Pesawat Tanpa Awak di Ruang Udara Yang Dilayani ndonesia. Peraturan Menteri Perhubungan Republik ndonesia. Nomor PM . Jakarta, ndonesia. Li et al. . Quick mage Processing Method of UAV Without Control Point Data in Earthquacke Disaster Area. Transaction of Nonferrous Metals Society Of China. S ‐S 8. Elsevier Science Press. China. Mahafza . Matlab Simulations for Radar System Design. CRC Press. USA.