Tech Startup Growth Hacking 101 - Basics on Growth Marketing
TU3.T10.3.ppt
1. Sea Surface Current Measurement With Ku-Band SAR Along-Track Interferometry Nobuo Kumagae, Kazuo Kawamura, Kenji Tatsumi, Masatada Furuhata, Masayoshi Tsuchida, Masao Tsuji, Tomoya Yamaoka, Kei Suwa Japan Resources Observation System and Utilization Organization Mitsubishi Electric Corporation
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5. SAR System SAR Acquisition parameters The 10cm resolution Ku-band airborne SAR system (by Mitsubishi Electric Co.) 40cm 60deg Incidence angle 0.2m Effective baseline 300W Peak transmitted power 4500Hz Pulse Repetition Frequency 600MHz Transmitted signal bandwidth 16.45GHz Center frequency parameters value Polarization VV
7. Ground Truth We used a GPS-equipped handmade float to observe the “ground truth.” Sinker Pole Float GPS Logger (DG-100)
8. Ground Truth Sea surface current speed was 0.7m/s ～ 0.9m/s during the flight test 1 st trial 2 nd trial 3 rd trial Flight test was conducted during this period N 15:01:48 ～ 15:02:53 14:02:18 ～ 14:03:18 12:37:18 ～ 12:38:23 Time 0.9 m/s = 1.7 knot 3 rd trial 0.7 m/s = 1.4 knot 2 nd trial 0.5 m/s = 0.9 knot 1 st trial Sea surface current speed
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11. Results Flight Path A : average cross range velocity was estimated to be 0.95m/s Radial velocity map (Resolution: 35m) SAR image (Resolution: 0.6m) m/s Azimuth (1.4km) Range (340m) v GND = 0.95[m/s] N A B C Tidal Current ATI phase off-nadir angle wavelength Effective baseline platform velocity 0.018 m 60° 0.2 m 100 m/s parameters value 1.15 rad
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13. Results Flight Path B & C : the two images have been registered using the buoy signal. Flight Path C: SAR image (0.6m res.) rad rad Flight Path C: Interferogram （ 10m res. ） azimuth range Flight Path B: SAR image (0.6m res.) Flight Path B: Interferogram （ 10m res. ） N azimuth range
14. Results V_N = 0 ． 51 [m/s] V_E = -0 ． 64m/s] Mean velocity Estimated sea surface current speed ： 0.82m/s Matches well with the ground truth (0.7m/s ～ 0.9m/s ). Spatial resolution : 10m x 10m Flight Path B & C : Two-dimensional sea surface current map can be obtained by combing two perpendicular ATI data sets in rapid succession. N
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