Biography
Biography: Oleg V. Goriachkin
Abstract
Remote sensing spacecrafts allow observing the Earth's surface in different bands of the electromagnetic spectrum. Radar satellites used today X, C, S, and L bands of frequencies. Increased interest in the use of space synthetic aperture radar (SAR) P band to monitor subsurface, hidden objects, geological mapping, measuring the biomass of vegetation and other applications [1,3,4,5].
The purpose of the conducted experiments per “AIST-2D”, successfully launched in April 2016 from the cosmodrome “Vostochny”, it consists in finalizing of the technology of radar surveillance of the earth's surface in P band [2]. Onboard equipment of the SAR is the multimode impact transmitter, which ensures the wide range of stable signals at the carrier frequency 435 MHz, in the strip to 6 (30) MHz the possibility of reconstruction from 1 to 30 MHz. Types of the signals: the sequence of square pulses, the sequence of chirp, the sequence of the phase-keyed signals, coded M-sequences. Onboard transmitting antenna is Yagi antenna, polarization – linear, the antenna gain - 5 dB. Ground-based stationary equipment is two-channel tuned radio receiver (to 110 dB) with digital registration of quadrature components at the frequency to 200MHz and subsequent digital processing of signals. The ground-based receiving antenna “reflected” channel is “stack” of two Yagi antennas, antenna polarization – circular, the antenna gain of the “reflected channel” – 20 dB, “straight” – 9 dB.
Onboard equipment bistatic of the radar with the synthesized aperture, which works in the P- band to 01.11.2016, could not be switched into the mode of regular work. The analysis of causes for failure and the search for the versions of the start of transmitter continue.