Open AccessExperimental Study on Doppler Performance of Satellite Emergency Communicator Based on LoRa System
Author(s) -
Yonggang Zhang,
Jianyun Chen,
Sili Liu
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/768/7/072080
Subject(s) - doppler effect , computer science , communications satellite , transceiver , sensitivity (control systems) , doppler frequency , signal (programming language) , channel (broadcasting) , bandwidth (computing) , satellite , real time computing , transmission (telecommunications) , bit error rate , electronic engineering , telecommunications , wireless , engineering , physics , astronomy , programming language , aerospace engineering
Aiming at the propagation loss and Doppler frequency shift problems faced by LEO satellite in realizing Internet of Things, the LEO satellite emergency communication machine is tested. The emergency communication machine adopts SX1280 chip as the transceiver unit, analyzes the bit error rate and Doppler frequency shift index of LoRa signal generated by SX1280, and proposes a test scheme combining satellite channel simulator and emergency communication machine. In the range of Doppler frequency shift less than 53 kHz, changing Doppler frequency and its change rate has less than 4 dB effect on signal communication sensitivity. Reducing signal transmission rate and bandwidth can improve communication sensitivity. It proves that LoRa signal generated by SX1280 chip can be effectively used in LEO satellite Internet of Things.