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Passive mm-wave imaging from UAVs using aperture synthesis

Published online by Cambridge University Press:  04 July 2016

A. R. Harvey  and
R. Appleby
A. R. Harvey
Affiliation:
School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh, UK
R. Appleby
Affiliation:
QinetiQ Malvern, UK
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Abstract

Passive imaging using mm-waves offers very significant advantages in scientific and military surveillance. However, the relatively long wavelengths mean that for the resolutions that are typically sought, the input aperture of the imager needs to be quite large; typically in excess of one metre. Deployment of conventional dish antennae of these dimensions on small aircraft is highly problematic. The use of snapshot synthetic aperture interferometric radiometry (SAIR) offers an attractive route to integrating a two-dimensional antenna array into the structure of an aircraft so that the transverse effective dimensions of the antenna can be almost as large as the aircraft. We report here a study into the feasibility of deployment of a SAIR on unmanned airborne vehicles and the achievable performance parameters. Critical considerations are the achievement of acceptable sensitivity and angular resolution from a SAIR that does not require excessive complexity. It is shown that traditional approaches based on fully sampling the spatial frequencies in the scene are unable to simultaneously meet all of these criteria, but that a SAIR based on thinned sampling of the spatial frequencies shows promise.

Type
Research Article
Information
The Aeronautical Journal , Volume 107 , Issue 1068: The UAV Special Issue , February 2003 , pp. 87 - 98
Copyright
Copyright © Royal Aeronautical Society 2001 

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References

1.Quote from US secretary of defense William S. Cohen, 14 October 1999.Google Scholar
2. IEEE Transactions on Geoscience and Remote Sensing, special edition, 1998,36.Google Scholar
3. Skou, N. and Laursen, B. Measurement of ocean wind vector by an airborne, imaging polarimetric radiometer, Radio Science, 1998, 33, (3), pp 669–675.Google Scholar
4. Appleby, R., Anderton, R.N., Price, S., Salmon, N.A., Sinclair, G.N, Borrill, J.R., Coward, P.R., Papakosta, P., Lettington, A.H. and Robertson, D.A. Compact real-time (video rate) passive millimetre-wave imager, 1999, Conference on passive millimetre-wave imaging technology, SPIE 3703, pp 13–19.Google Scholar
5. Moffa, P., Yujiri, L., Jordan, K., Chu, R.S., Agravante, H. and Fornaca, S. Passive millimetre wave camera flight tests, 2000, Conference on passive millimeter-wave imaging technology, SPIE 4032, pp 14–21.Google Scholar
6. Harvey, A.R., Appleby, R., Coward, P., Greenaway, A.H., Anderton, R. and Hawkins, G. Electronic beam-steering for passive millimetre-wave imaging, 1998, Fourth int Conf on mm and submm-waves and applications, San Diego, 20-23 July, SPIE 3465.Google Scholar
7. Blanchard, P.M., Greenaway, A.H., Harvey, A.R. and Webster, K. Coherent optical beamforming with passive millimetre wave arrays, 1999,J Lightwave Tech, 17, (3), pp 418–425.Google Scholar
8. Martin-Neira, M., Goutoule, J.M., Knight, A., Claude, J., Bara, J., Camps, A., Torres, F., Corbella, I., Lannes, A., Anterrieu, E., Laursen, B. and Skou, N. Integration of MIRAS breadboard and future activities, 1996, IGARSS, pp 869–871.Google Scholar
9. Le Vine, D.M., Griffis, A.J., Swift, C.T. and Jackson, T.J. ESTAR: A synthetic aperture microwave radiometer for remote sensing applications, 1994, IEEE 82,12, pp 1787–1801.Google Scholar
10. ESTAR 37 Airborne Imaging Radiometer System, Publicity material. Quadrant Engineering, Amherst, MA, USA.Google Scholar
11. Edelson, C. Applications of synthetic aperture radiometry, 1994, IGARSS, pp 1326–1328.Google Scholar
12. Komiyama, K. Indoor experiment of two-dimensional supersynthesis radiometer, 1994, IGARSS, pp 1329–1331.Google Scholar
13. Maillot, H.A. A cross beam interferometer for high resolution microwave sensing, 1993, IEEE Aerospace Appl Conf, pp 77–86.Google Scholar
14. Martin-Neira, M. and Font-Rossello, J. Mechanically scanned inter-ferometric microwave radiometer using sub-arraying, October 1997, ESTEC Internal Report, XR1/108.97/MMN.Google Scholar
15. Martin, C.A., Lovberg, J.A., Clark, S.E. and Galliano, J.A. Real time passive millimetre-wave imaging from a helicopter platform, 2000,Passive millimetre-wave imaging technology IV, SPIE 4032.Google Scholar
16. Harvey, A.R., Greenaway, A.H, Camps, A., Corbella, I., Torres, F., Bara, J. and Martin-Neira, M. Millimetre-wave aperture synthesis radiometry for snow and ice mapping, 1999, Int Conf on Geoscience Remote Sensing, Hamburg, 28 June-2 July 1999.Google Scholar
17. Harvey, A.R. Report on passive aperture synthetic mm-wave imaging from unmanned airborne vehicles, October 1999, Report to DERA DAPS/AH/42/99/O.A.Google Scholar
18. Camps, A., Bara, J., Torres, F., Corbella, I. and Romeu, J. Impact of antenna errors on the radiometric accuracy of large aperture synthesis radiometer, 1997, Radio Science, 32, (2), pp 657–668.Google Scholar
19. Torres, F., Camps, A., Bara, J., Corbello, I. and Ferrero, R. On-board phase and modulus calibration of large aperture synthesis radiometers: study applied to MIRAS, IEEE Transactions on Geoscience and Remote Sensing, 1996, 34, (4), pp 1000–1009.Google Scholar
20. Torres, F., Camps, A., Bar, J. and Corbella, I. Impact of receiver errors on the radiometric accuracy of large aperture synthesis radiometer, Radio Science, 1997, 32, (2), pp 629–641.Google Scholar
21. Ruf, C.S. Error analysis of image reconstruction by a synthetic aperture interferomtric radiometer, Radio Science, 1996, 26, (6), pp 1419–1434.Google Scholar
22. Tanner, A.B. and Swift, C.T. Calibration of a synthetic aperture radiometer, IEEE Transactions on Geoscience and Remote Sensing, 1993, 31, (l), pp 257–267.Google Scholar
23. Weissman, D.E. and Le Vine, D.M. The role of mutual coupling in the performance of synthetic aperture arrays, Radio Science, 1998, 33, (3), pp 767–779.Google Scholar
24. Torres, F., Camps, A., Bara, J., Corbella, I. and Ferrerro, R. On-board phase and modulus calibration of large aperture synthesis radiometers: study applied to MIRAS, IEEE Transactions on Geoscience and Remote Sensing, 1996, 34, (4), pp 1000–1009.Google Scholar
25. Burnett, J.G., Erry, G.R.G., Dickson, R., McBride, R., Gander, M., Jones, J.D.C., Blanchard, P.M., Greenaway, A.H. and Harvey, A.R. Channelled spectrum interrogation of an all fibre broadband interfero-metric differential strain sensor, 1998, European Workshop on Optical Fibre Sensors, 3483, Ch 66, pp 174–178.Google Scholar
26. Woods, S., Greenaway, A.H. and Harvey, A.R. Optimal shape reconstruction using modal decomposition, 1998, IOP conference on applied optics and electronics, Brighton, UK, 16-19 March, pp 145–150.Google Scholar
27. Harvey, A.R. Determination of the optical constants of thin films in the visible by dispersive Fourier transform spectroscopy, Review of Scientific Instruments, 1998, 69,(10), pp 3649–3658.Google Scholar
28. Ruf, C.S., Swift, C.T., Tanner, A.B. and Le Vine, D.M. Interfero-metric synthetic aperture radiometry for the remote sensing of the Earth, IEEE Transactions on Geoscience and Remote Sensing, 1988, 26, (5), pp 597–611.Google Scholar
29. Thompson, A.R., Moran, J.M. and Swenson, G.W. Interferometry and Synthesis in Radio Astronomy, 1986, Wiley, pp 162–165.Google Scholar