Abstract
For modelling transmission of ADS-B messages via low-orbit satellite constellation Iridium, the original model of a communication channel “Aircraft-to-Satellite-to-Ground Station” was built using MATLAB Simulink. The model comprises “Aircraft Uplink Transmitter” (Bernoulli Random Binary Generator, Convolutional Encoder, BPSK Baseband Modulator, High Power Amplifier with a memoryless nonlinearity, Transmitter Dish Antenna Gain), “Uplink Path” (Free Space Path Loss, Phase/Frequency Offset), “Satellite Transponder” (Receiver Dish Antenna Gain, Satellite Receiver System Temperature, Complex Baseband Amplifier, Phase Noise, Transmitter Dish Antenna Gain), “Downlink Path” (Free Space Path Loss, Phase/Frequency Offset), “Ground Station Downlink Receiver” (Receiver Dish Antenna Gain, Ground Receiver System Temperature, Viterbi Decoder), “Error Rate Calculation” block and “Display”. The modelling was realized without and with convolutional coding (r = 3/4, K = 7) at different noise temperatures and free space losses. Dependencies of a Bit Error Rate on free space path losses, antenna's diameter, phase/frequency off-sets, satellite transponder linear gain, aircraft and satellite transponder high power amplifier back-off level, and phase noise were received and analysed.
Highlights
Flight safety depends on many elements (Kharchenko, Alexeiev 2010; Kulyk et al 2011)
The aim of this paper is: 1) to design the model of communication channel “Aircraft-to-Satellite-toGround Station” with error-control coding for Iridium system using MATLAB Simulink software; 2) on the base of this model investigate the integrity of a channel and receive dependences of a bit-error rate (BER) on a free space path loss, a phase/frequency offset, a satellite transponder linear gain, airborne and backoff level of satellite transponder high power amplifiers, diameter of antennas, phase noise and noise temperature; 3) to analyse the constellation before and after high power amplifiers
Modelling was provided for two values of effective noise temperatures of 20 K and 290 K of satellite and ground station receiver systems
Summary
Flight safety depends on many elements (Kharchenko, Alexeiev 2010; Kulyk et al 2011). On June 20, 2012 satellite Iridium operator has decided that from 2015 they will be putting ADS-B receivers on its next-generation satellite constellation, aimed at bringing global, real-time aircraft surveillance for air navigation service providers The aim of this paper is: 1) to design the model of communication channel “Aircraft-to-Satellite-toGround Station” with error-control coding for Iridium system using MATLAB Simulink software; 2) on the base of this model investigate the integrity of a channel and receive dependences of a bit-error rate (BER) on a free space path loss, a phase/frequency offset, a satellite transponder linear gain, airborne and backoff level of satellite transponder high power amplifiers, diameter of antennas, phase noise and noise temperature; 3) to analyse the constellation before and after high power amplifiers
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