Surveying radar system for the remote sensing of the Earth with enhanced azimuthal resolution

1Efimov, VB, 1Kurekin, AS, 1Sytnik, OV, 1Tsymbal, VN, 1Gavrilenko, AS, 1Kabanov, AV
1A.I. Kalmykov Center for Radio Physical Sensing, NAS of Ukraine and National Space Agency of Ukraine, Kharkiv, Ukraine
Kosm. nauka tehnol. 2007, 13 ;(Supplement1):071-074
Publication Language: Russian
The system is offered for the remote sensing of the Earth on the basis of the pulse coherent radar operating in two modes, surveying and of high resolution. In the surveying mode the radar has an azimuthal resolution 50–100 m and swath about 500–600 km at a height of orbit from 650 to 750 km. In the mode of high resolution the radar works on the SAR principle and has a potential resolution 2–5 m in swath 10–15 km in any part of general swath of 500 to 600 km. SAR radiates the sequence of packs of pulses with bearing frequency changing from one impulse to the other. Thus, pulse repetition frequency in a pack is chosen to describe the displacement of trajectory signal Doppler frequency, but the frequency of packs is chosen low enough to exclude an ambiguousness on distance. The frequency selection of impulses within the limits of one pack is carried out in the wideband of intermediate frequency with the general width of band about 100 MHz. The signal processing block is built on a multichannel scheme. The amount of channels of the block is determined by the number of frequency changes into the pack of impulses. The frequency-temporal selection of the signals reflected from the surface and compression of impulses for providing high range resolution are carried out in every channel separately. The features of construction of multichannel structure of SAR receiving device and algorithm of the trajectory signal processing are examined. The limitations on the amount of additional narrowband channels and width of frequency band of every channel is the subject of wide discussion.
Keywords: coherent radar, high resolution, remote sensing
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