Abstract
Telecommand receiver is responsible for receiving the commands uplinked from the ground stations and transmits the demodulated data to satellite management unit which is responsible for executing them. The existing telecommand receivers contain RF front end having VCO, mixers, analog I/Q downconverters, LPF, and two ADCs. Modulation schemes in the existing telecommand receivers are PM-PSK and FM-PSK. The objective of the proposed receiver design is to have minimum RF involvement having one high-speed ADC and direct digitally demodulated output. Using Direct-PSK modulation high data rates of 128/256 kbps can be achieved which simplifies the design. The design and simulation is performed in MATLAB/Simulink and involves telecommand transmitter, ADC, BPF, DDC with decimator, Direct-PSK demodulator, FFT-based frequency estimator, and bit synchronizer. The bit error rate (BER) is 0 after 302 bits are received and demodulated successfully after 2.34 ms. The designed telecommand receiver thus works for an input gain of 0 dB to −40 dB. BER is observed at −40 dB. The band-limited noise is 10–15. The input frequency sweep rate is 250 Hz for a range of frequencies 5 MHz ± 500 kHz.
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Srihari, N.S., Amruth Kumar, S., Premananda, B.S. (2022). Design and Simulation of a Direct-PSK Based Telecommand Receiver for Small Satellite. In: Suma, V., Fernando, X., Du, KL., Wang, H. (eds) Evolutionary Computing and Mobile Sustainable Networks. Lecture Notes on Data Engineering and Communications Technologies, vol 116. Springer, Singapore. https://doi.org/10.1007/978-981-16-9605-3_59
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