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A comparison between in-field scatterometric and strip map SAR measurements of extended random surfaces has been proposed as the optimum approach to check absolute radiometric calibration on the SAR products. A similar procedure can be applied in indoor measurements when, as in the European Microwave Signature Laboratory (EMSL) at the JRC, it is possible both to undertake scatterometric measurements and to obtain SAR images from the same extended target. The derivation of the scattering coefficient in these two types of experiments is essentially different because in the first case an incoherent power average is performed over an ensemble of independent measurements of the whole target (obtained by rotating the object about the vertical axis); while in the second case, first the image is synthesised through a coherent linear process, and then a spatial incoherent averaging is applied. In both cases, additional independent samples can be obtained by using the signal decorrelation in the frequency domain. The scope of the work presented is twofold: (i) verification of the selfconsistence of the two experimental approaches in the estimation of the scattering coefficient; (ii) analysis of the dependence of the accuracy in the calculation upon both the measurement system and the target parameters (angle of incidence, centre frequency and bandwidth, rms height and correlation length).

Additional information

Authors: NESTI G, JRC Ispra (IT);FORTUNY J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: IGARSS '95, Firenze (IT), July 10-14, 1995
Availability: Available from (1) as Paper EN 38995 ORA
Record Number: 199510728 / Last updated on: 1995-07-07
Original language: en
Available languages: en