METHODOLOGY OF THE NUMERICAL MODELLING OF PARAMETERS DETERMINATION OF THE RADIOMETRIC IMAGE OF REMOTE EARTH SURFACE SENSING BY BISTATIC RADIOMETER
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Abstract
The on-board bistatic radiometer (BR) provides sufficiently high-quality mapping of various terrestrial surfaces. The subject of study in the article is the determination of parameters of radiometric images (RI) of earth surfaces based on the BR construction options that are technically feasible. The aim of the research is to develop a methodology for numerical modelling of RI parameters calculation during remote sensing of the earth's surfaces by BR. Tasks: To consider the range of the radar, accounting for image bands, detection, and measurement of course difference, and resolution along the carrier's flight path and across its path. The task also includes the calculation of the difference Doppler frequency correction (DDFC) of payload signals, root mean square deviations (RMSD) of pitch difference errors and DDFC errors. Methods used: analysis and synthesis of the obtained output RI parameters according to possible construction options. The following results were obtained. A methodology for numerical modelling of RI parameters determination during remote sensing of a low-contrast payload such as grass-concrete is developed. The AN-14 ‘Bee’ aircraft was chosen as a carrier for the BR, and the 22 GHz bandwidth of the sub-waveband was chosen for the BR 3 mm. The analysis was carried out for six possible variants of the mapping system. The ranges of the systems, the values of image bands, and the DDFC of objects are calculated, considering the accepted technical characteristics of the radar and the influence of the atmosphere. The RI characteristics at a probability of correct detection of 0.5 are presented. The image parameters for measuring the differences in the stroke and DDFC of mapping objects are given. The number of pixels (pitch differences) in the image row, the resolution along the carrier path, across the path, and at the DDFC were calculated. The number of Doppler filters for each pitch difference, the RMSD of the pitch difference measurement, and the RMSD of the object's DDFC measurement were obtained. The values of the fluctuation sensitivity of the BR were calculated for the following design variants. Conclusions. Based on the results of numerical modelling, the analysis of the information capacity per RI during remote sensing of earth surfaces by an onboard system that is spaced apart is carried out. A promising area for further research may be the introduction of a very weak broadband noise sensing signal into the mapping system and the assessment of the impact of interference that is spatially correlated in the BR.
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References
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