Analysis of the possibilities of using reflected radiation of ground-based radioelectronic devices from low-orbit Earth satellites
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Analysis of the possibilities of using reflected radiation
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- Signal-to-noise ratio at the receiver
Parameter
Value Wavelength λ, m 0,9 Pulse width, ms 2,66 System losses L, dB 6 Noise temperature, К 290 ESA of objects S эфо , m 2 1,0 Transmitter Amplifier 𝐺 𝑡 , dB 30 Receiver Amplifier 𝐺 𝑟 , dB 32 Distance from the transmitter to the objects 𝑅 1 , km 424 Distance from receiver to objects 𝑅 2 , km 424 Signal-to-noise ratio at the receiver: Probability of detection 0,1 The probability of a false alarm 0,05 Number of impulses 30 Maximum power of the transmitter, W 20 Fig. 6. M-file of the Radar Equation Calculator application Using the Radar Waveform Analyzer signal analyzer application in MATLAB, it is possible to visualize the real and imaginary parts, magnitude and phase graphs, signal autocorrelation, spectral analysis of the signal, etc. It can also get a calculation of the minimum and maximum range, range resolution, etc. To do this, it needs to specify the following parameters: sampling rate, number of pulses, pulse width, system losses, bandwidth, etc. Figures 7 and 8 show the analyzer of the real and imaginary parts of the signal and the spectral analysis of the signal. Fig. 7. M-file and analyzer of the real and imaginary part of the signal Fig. 8. M-file and signal spectral analysis To detect and restore a useful signal on the terminal device at a distance of 600 km from the receiver to the transmitter, the power on the transmitter must be large. To reduce the power of the transmitter, one solution is to increase the number of pulse signals. The calculation results are obtained by increasing the number of pulses from 1 to 30. When 30 pulses with a maximum power of 20 watts are accumulated on the receiver, it is possible to receive a useful signal re-reflected from a group of space objects in low Earth orbit at 424 km from the receiver and transmitter. In the example given, the information is transmitted at a speed of 8 bit/s, while the signal level at the receiver will be -17.7 dB. Fig. 9. Graph of the dependence of the transmitter power on the number of pulses CONCLUSION As a conclusion, we can say that the use of reflected radiation of ground-based radio-electronic communications from low-orbit idle satellites and their fragments of the Earth has good prospects, since the number of satellite data and its fragments continues to grow. As the study showed, when 30 pulses with a maximum power of 20 watts accumulate on the receiver, it is possible to receive a useful signal re-reflected from a group of space objects in low Earth orbit at 424 km from the receiver and transmitter. In the example given, the information is transmitted at a speed of 8 bit/s, while the signal level at the receiver will be -17.7 dB. It is necessary to evaluate the characteristics of the reflected radiation of radio-electronic means and build a mathematical model on this in order to better derive the expected results from the actual use of these systems. V. S OURCE OF FINANCING . G RATITUDES This research has been funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (Grant No. AP14869120). R EFERENCES [1] NORAD database of spacecraft in near-Earth orbits [Electronic resource]. – Access mode: http://satellitedebris.net/Database/index.php. 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Features measurement parameters and control functioning of integrated chips // 2016 International Conference on Information Science and Communications Technologies, ICISCT 2016 DOI: 10.1109/ICISCT.2016.7777379 Download 445,63 Kb. Do'stlaringiz bilan baham: |
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