Low complexity sparse noise reduction method for Loran‐C skywave delay estimation

Abstract

A sparse noise reduction method applied to Loran-C skywave delay estimation is presented, which is both simple and practicable. Signal sparsity is utilised to reduce the noise inside the Loran frequency band and significant improvement in the performance of estimation is achieved. The proposed method shows increased estimation accuracy with reduced computational complexity owing to no matrix inversion in the computation process.

Loran phase code revisited for continuous wave interference cancellation

“…The Loran‐C receivers can be used in noisy environments. The designers of Loran‐C system and receiver manufacturers have been tried to evaluate and eliminate the serious problems in extraction information corresponding to positioning of time of arrival (TOA) measurements being affected by interference [12–17]. Previous studies have proved that the CWI can be classified in terms of the relation of its frequency with Loran‐C signal [1, 18, 19].…”

Long‐range Loran‐C ground‐wave propagation prediction based on adaptive moving window finite‐difference time‐domain method with compute unified device architecture parallel computing techniques

“…As GNSS (GPS and GLONASS) are inherently vulnerable to interference, disruption, jamming and spoofing, many governments and civilian organisations around the world are devoting to the upgrading research of Long Range Navigation System (Loran-C) [6][7][8][9][10]. Loran-C was a ground-based navigation system administered by the U.S. Coast Guard.…”

“…Global Positioning System (GPS) by US government and GLONASS (Globalnaya Navigatsionnay Sputnikovaya Sistema) by the Russian Federations are both satellite based positioning systems. As GNSS (GPS and GLONASS) are inherently vulnerable to interference, disruption, jamming and spoofing, many governments and civilian organisations around the world are devoting to the upgrading research of Long Range Navigation System (Loran‐C) [6–10]. Loran‐C was a ground‐based navigation system administered by the U.S. Coast Guard.…”