A Novel Ground Based Multi Bistatic Radar for Interferometric Measument of Displacement Vector - F.Parrini #2698.ppt
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1) The document describes a new multi-bistatic radar system that uses three independent radar measurements to estimate three-dimensional displacement vectors, overcoming limitations of traditional monostatic radar interferometry which only measures line-of-sight displacement. 2) Experimental tests were conducted using a specially designed target that could be automatically positioned and rotated. The results demonstrated high measurement accuracy for displacements along single axes and arbitrary directions. 3) This new multi-bistatic radar sensor shows potential for providing full three-dimensional displacement measurements which are important for static and dynamic testing of civil structures.
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- 1. Filippo Parrini Technologies for Environmental and Cultural Heritage Laboratory (TECHLab) Department of Electronics and Telecommunications University of Firenze (Italy)
- 2. Ground based radar interferometry
- 3. Ground based radar interferometry LINE OF SIGHT DISPLACEMENT
- 5. Multi bistatic radar: operating principle d : target displacement d1,d2,d3 : target displacement projections
- 6. Multi bistatic radar: issues Instrumental issues Geometric issues Radar issues Cable thermal drift Multi-bistatic RCS of natural/artificial targets Measurement geometry determination Displacement components estimation
- 7. Instrumental issues: cable ’ s thermal drift This effect has not been compensated yet Highly phase stable cable
- 8. Radar issues: bistatic RCS Natural or man-made reflectors usually have a very low RCS in multi bistatic mode It is more difficult to have radar reflectors with a good RCS in several directions in order to perform a robust interferometric analysis
- 9. Geometric issues 2) The targets position in the reference system has to be determined (it can be retrieve from radar range measurement ) 3) Target displacement vector ( d x , d y , d z ) has to be estimated (made with the following relation) A measurement setup geometry which assure a small condition number for matrix A is necessary for a good accuracy in displacement vector estimation 1) The multi-bistatic radar position in the reference system has to be known (it can be easily measured with additional instruments) ( d 1 ,d 2 ,d 3 ) interferometric measurements
- 10. Experimental tests in controlled environment No vertical baseline was achieved
- 11. Experimental tests Special multi-bistatic target automatically positioned and rotated Side view Front view
- 12. Experimental test #1: displacement along y axis Direction of the displacement during the 1 st test
- 13. Experimental test #1: displacement along y axis Displacement of target measured by three radar channels (d 1 ,d 2 ,d 3 )
- 14. Experimental test #1: displacement along y axis Measurement displacement along the reference system axis (X = red, Y= blue) Errors: Mean: -0.01 mm : 0.03 mm
- 15. Experimental test #2: displacement along any direction Direction of the displacement during the 2 st test ( =23.5)
- 16. Experimental test #2: displacement along any direction Errors: Mean: -0.02 mm : 0.03 mm
- 17. Conclusions The novel sensor was tested in a controlled environment showing good performances in term of measurement accuracy. A novel multi-bistatic radar sensor has now been designed and set up in order to provide three dimensional measurement capabilities. Only LOS component of displacement is provided by traditional interferometric radar. Measurement of displacement vector is of paramount importance in static and dynamic tests on civil structures.