Abstract: In a method for compressing raw digital SAR data input data are first coded with fewer bits by means of an adaptive block quantization (BAQ) and subsequently vectors are formed from the block-quantized data. The vectors are coded by a special mapping table in order to achieve an effective data reduction. In a method for decompressing digital data, vectors are generated from the coded data by means of a code book table, from which scalar values are formed. After de-standardization of the scalar values, decoded data are obtained in that the scalar values are multiplied for the de-standardization by the standard deviation of each block already calculated during coding.

Abstract: The acceleration sensor has an elastic member (11) to which an inertial body (12) is attached. Upon the occurrence of an acceleration force, the elastic member (11) is deformed. In order to measure the absolute value of the acceleration, a calibration may be performed. In such calibration, a measuring value of the acceleration is obtained from the excursion of the inertial body (12) at a given density of the medium surrounding the inertial body. Subsequently, a second measuring of the same acceleration is taken at a varied density of the gas surrounding the inertial body, thereby obtaining a second measuring value. In further measurements, the absolute value of the acceleration may be calculated from the differences between the gas densities and the measured values.