It is proposed in connection with a method for the interferometric radar measurement in conjunction with a helicopter operating in accordance with the ROSAR principle (Heli-Radar) that two coherent receiving antennas with receiving channels are associated with a transmitter of the ROSAR-system mounted on the revolving rotary cross; and that the difference (.DELTA.R) between the two distances (R+.DELTA.R, R) from the measured impact point P are calculated, in the manner known per se, based on the wavelength .lamda. of the emitted radar signal and the measured phase difference of the receiving echo of the two coherent receive channels.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation in part application of U.S. patent application Ser. No. 09/889,759 filed on Jul. 20, 2001, now abandoned incorporated herein by reference wherein priority is claimed under 35 U.S.C. 120, this application also claims priority under 35 U.S.C. .sctn.371 from PCT/DE99/04066 filed on Dec. 22, 1999, and also claims priority under 35 U.S.C. 119 from German Patent Application DE 199020078 filed on Jan. 21, 1999.
Methods and systems for using ground penetrating radar (GPR) to obtain subsurface images. The depression angle, frequency, and polarization can all be adjusted for the soil conditions at hand. In particular, the depression angle is set at the "pseudo-Brewster angle" for improved ground penetration.
