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Truck Characteristics Analysis from All Aspect Angles with Quad-pol Radarsat-2 Images

Explore how truck characteristics change with aspect angle using Radarsat-2 images. Analyze impact of structure on radar cross-section (RCS) values and detection. Discover optimal angles for truck detection with comprehensive analysis.

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Truck Characteristics Analysis from All Aspect Angles with Quad-pol Radarsat-2 Images

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  1. Truck Characteristics Analysis from All Aspect Angles with Quad-pol Radarsat-2 Images ZHANG Bo, WANG Chao, ZHANG Hong July 26, IGRASS 2011

  2. Outline • Motivation • Experiment data • Analysis method and discussion • Conclusion

  3. Outline • Motivation • Experiment data • Analysis method and discussion • Conclusion

  4. Motivation

  5. Motivation [1] Gintautas Palubinskas and Hartmut Runge. Rasar Signatures of a Passenger CAR. IEEE Geoscience and Remote Sensing Letters, Vol.4,No.4,2007 [2] D. Hounam, S. Baumgartner, K. H. Bethke, M. etc. , “An autonomous, non-cooperative, wide-area traffic monitoring system using space-based radar (TRAMRAD),” in Proc. IGARSS, Seoul, Korea, Jul. 2005, pp. 2917–2920.

  6. Motivation Their researches are based on the air-born E-SAR data.

  7. Outline • Motivation • Experiment data • Analysis method and discussion • Conclusion

  8. Experiment data Radarsat-2 quad polarimetric SAR images How to change the characteristics with aspect angle? what size of the truck can be detected? How do truck structure affect characteristics? （A）Medium truck （B）Carriage （C）larger truck （D）Tank truck

  9. Experiment data Time Background Incidence angle Truck size Aspect angle 2009-2 23.2° 8.7，2.3，3.4 soil-rock mixture roadbed 2009-4 23.2° 5.7, 2.2, 2.6 2009-9 11.9, 2.5, 3.8 Asphalt road 39.7° 2010-3 2010-6 15.8, 2.5, 3.98 Concrete road 2010-10 48.1° 10.9, 2.47, 3.22

  10. Outline • Motivation • Experiment data • Analysis method and discussion • Conclusion

  11. Analysis methods and discussion aspect angle: ∠S = A + ∆A+∆B A : measured by compass ∆A: local magnetic declination inverse calculated by the four corners’ geographic coordinates in SAR image ∆B: Incidence angle: Calculated on the ellipsoid surface

  12. Analysis methods and discussion Aspect angle Intersection angle 0/0,225/45,270/90 As the left and right sides of truck are symmetrical, the scope of aspect angle can be reduced from [0, 360] to [0, 180]. The front and rear shape of truck are almost similar. To facilitate comparison, the aspect angle can be approximately replaced by the minimum intersection angle which is the angle between x-direction and long side of truck. So the intersection angle is in the range of [0, 90]. 180/0,225/45,270/90 181/1,193/13,206/26 217/37,223/43,229/49 239/59,251/71,262/82,272/92 2/2,351/9,151/29,45/45

  13. Analysis methods and discussion the area of one pixel in SAR image stands for the area integral at the position of (c, t)

  14. Discussion of SPAN value A B C Four types truck SPAN value characteristic pattern with intersection angle and incidence angle. which factor is more impacted on RCS value within incidence angle and size? Incidence angle: A < C < D Truck size : A < C < D D SPAN value: D < A < C structure is the key factor

  15. Discussion of background value Four types truck SPAN value characteristic For the wavelength of Raradarsat-2 beam is 5.5 cm and roads are relatively smooth, the clutter of background shows lower at larger incidence angle, which will improve truck detection ratio. Considering the impact of incidence angle on the translation of slant range to ground range, it can be concluded that same truck will occupy more pixels on slant range and bring stronger backscatter on larger incidence angle image. In short, the larger incidence angle SAR image will be more favorable to truck detection.

  16. Discussion of the impact aspect angle the even bounce is always bigger than other Pauli components except at the intersection angle around 45°. the higher SPAN value between 43° and 71° is due to the odd bounce which may be caused by the rough truck tarpaulin roof. The smooth and bare cylindrical structure of tank truck lead to the odd backscatter bounce very weak.

  17. Conclusion • Structure rather than size is the key factor which affects the truck characteristics. • When the truck heading turning form perpendicular to parallel to the SAR illumination, the even bounce intensity will be decreased at first and then increased, the alter angle is 45°. • Incidence angle also impact the RCS value. But its impact on the background will be even greater . it can be confident that SAR image at larger incidence angle is beneficial to increase the detection ratio for truck detection. Structure RCS Incidence angle Aspect angle

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