[15] ADLER, D., and JACOBS, M.: ‘Application of a narrowband FW-CW system in the measurement of ice thickness’. Proc. IEEE MTT-S Int. MicrowaveSymposium, Atlanta, GA, USA, 14-18 June 1993, Vol. 2, pp. 809-812, IEEE Cat. No. 93CH3277-1

[16] AL-ATTARA., DANIELS, D. J., and SCOTT, H. R: ‘A novel method of suppressing clutter in very short-range radars’. RADAR-82, Proc. IEE Int. Radar Conf., London, UK, 18-20 October 1982, pp. 419^23

[17] BOTROS, A. Z., OLVER, A. D., CUTHBERT, L. G., and FARMER, G.: ‘Microwave detection of hidden objects in walls’, Electron. Lett, 1984, 20, pp. 379-380

[18] CARR, A. G., CUTHBERT, L. G., and LIAU, T. R: ‘Signal processing techniques for short-range radars applied to the detection of hidden objects’. 7th IEEE European Conf. on Electrotechnics, EUROCON 88, Paris, France, April 1986, pp. 641-646

[19] FARMER, G. A., CUTHBERT, L. G., OLVER, A. D., andBOTROS, A. Z.: ‘Distinguishing between types of hidden objects using an FMCW radar’, Electron. Lett, 1984, 20, pp. 824-825

[20] GARVIN, A. D. M., and INGGS, M. R.: ‘Use of synthetic aperture and stepped frequency continuous wave processing to obtain radar images’. South African Symposium on Communications and signal processing, COMSIE 91, Pretoria, South Africa, 1991, pp. 32-35

[21] HUA, L., COOPER, D. C, and SHEARMAN, E. D. R.: ‘A prototype FMCW radar using an analogue linear frequency sweep’. Proc. IEE Colloquium on High time-bandwidth product waveforms in radar and sonar, London, 1 May 1991, IEE Digest No.093, pp. 11/1-3

[22] JI-CHANG, R: ‘A new method of signal processing with high range resolution and reduced wide-bandwidth for linear-FMCW radar’, AMSE Rev., 1990, 14, (1), pp. 59-63

[23] OLVER, A. D., CUTHBERT, L. G., NICOLAIDES, M., and CARR, A. G.: ‘Portable FMCW radar for locating buried pipes’. Radar 82 Conf., London, 1982, IEE Conf. Publ. 216, pp. 413^18

[24] OLVER A. D., and CUTHBERT L. G.: ‘FMCW radar for hidden object detection’, IEE Proc. F. Commun., Radar Signal Process., 1988, 135, pp.354-361

[25] PEEBLES, P. Z., and STEVENS, G. H.: ‘Atechnique for the generation of highly linear FM pulse radar signals’, IEEE Trans. Mil. Electron., 1965, 9, pp. 32-38

[26] STOVE, A. G.: ‘Linear FMCW radar techniques’, IEE Proc. F, 1992,139, (5), pp.343-351

[27] TRANSBARGER, 0.: ‘FM radar for inspecting brick and concrete tunnels materials evaluation’, 1985, 43, (10), pp. 1254-1261

[28] YAMUGUCHI, Y, SENGOKU, N., and ABE, T.: ‘FM-CW radar applied to the detection of buried objects in snowpack’. Proc. IEEE Int. Symposium on Merging technologies for the 90s, Dallas, TX, USA 7011, May 1990, IEEE Cat No. 90CH2776-3, Vol. 2, pp. 738-741

[29] YAMAGUCHI, Y, MARUYANA, Y, KAWAKAMI, A., SENGOKO, M., and ABE, T.: ‘Detection of objects buried in wet snowpack by FM-CW radar’, IEEE Trans. Geosci. Remote Sens., 1991, 29, (2), pp. 201-208

[30] YAMAGUCHI, Y, MITSUMOTO, M., SENGOKU, M., and ABE, T.: ‘Synthetic aperture FM-CW radar applied to the detection of objects buried in snowpack’. Int. IEEE Symp. Digest Antennas and Propagation, May 1992, pp. 1122-1125