Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Lorenzo Ortega"'
Publikováno v:
EURASIP Journal on Advances in Signal Processing, Vol 2024, Iss 1, Pp 1-10 (2024)
Externí odkaz:
https://doaj.org/article/eaa09d4570b54acf8855a640bf98ea8d
Publikováno v:
EURASIP Journal on Advances in Signal Processing, Vol 2024, Iss 1, Pp 1-21 (2024)
Abstract Time-delay and Doppler estimation is crucial in various engineering fields, as estimating these parameters constitutes one of the key initial steps in the receiver’s operational sequence. Due to its importance, several expressions of the C
Externí odkaz:
https://doaj.org/article/52cc134d3b6f4063afa398321d3f9d34
Autor:
Julien Lesouple, Lorenzo Ortega
Publikováno v:
EURASIP Journal on Advances in Signal Processing, Vol 2024, Iss 1, Pp 1-24 (2024)
Abstract Interferences pose a significant risk to applications that rely on global navigation satellite systems (GNSSs). They have the potential to degrade GNSS performance and even result in service disruptions. The most notable type of intentional
Externí odkaz:
https://doaj.org/article/4416c55914e047f7949538cd9b96cca9
Publikováno v:
Navigation, Vol 70, Iss 4 (2023)
Global navigation satellite systems (GNSSs) play a key role in a plethora of applications, ranging from navigation and timing to Earth observation and space weather characterization. For navigation purposes, interference scenarios are among the most
Externí odkaz:
https://doaj.org/article/90b82d0e81644a118b8548efc5dda2d4
Autor:
Lorenzo Ortega, Charly Poulliat
Publikováno v:
Navigation, Vol 70, Iss 3 (2023)
In this article, we present the design of a new navigation message system that includes an error-correcting scheme. This design exploits the “carousel” nature of the broadcast navigation message and facilitates (i) a reduction in the time to firs
Externí odkaz:
https://doaj.org/article/0fc1701ea9474465b306b349a5056dec
Publikováno v:
IET Radar, Sonar & Navigation, Vol 15, Iss 2, Pp 113-127 (2021)
Abstract This article investigates new strategies to compute accurate low‐complexity log‐likelihood ratio (LLR) values based on the Bayesian formulation under uncorrelated fading channels for both antipodal and code shift keying modulations when
Externí odkaz:
https://doaj.org/article/7a1da69c0acc46ebb31844299af0c23c
Publikováno v:
Remote Sensing, Vol 13, Iss 6, p 1085 (2021)
Global Navigation Satellite System Reflectometry (GNSS-R) is a powerful way to retrieve information from a reflecting surface by exploiting GNSS as signals of opportunity. In dual antenna conventional GNSS-R architectures, the reflected signal is cor
Externí odkaz:
https://doaj.org/article/e50b51881eb84ec0bd0d655e50c6f34e
Autor:
Lorenzo Ortega, Charly Poulliat, Marie Laure Boucheret, Marion Aubault Roudier, Hanaa Al-Bitar, Pau Closas
Publikováno v:
Sensors, Vol 21, Iss 4, p 1341 (2021)
In this article, we provide closed-form approximations of log-likelihood ratio (LLR) values for direct sequence spread spectrum (DS-SS) systems over three particular scenarios, which are commonly found in the Global Navigation Satellite System (GNSS)
Externí odkaz:
https://doaj.org/article/6e33ba0f9c474e8e8d71cfe4f3b00b6d
Publikováno v:
Remote Sensing, Vol 12, Iss 23, p 3894 (2020)
Evaluating the time-delay, Doppler effect and carrier phase of a received signal is a challenging estimation problem that was addressed in a large variety of remote sensing applications. This problem becomes more difficult and less understood when th
Externí odkaz:
https://doaj.org/article/8f09c85f6e864318b00d97fee925c006
Publikováno v:
Sensors, Vol 20, Iss 12, p 3586 (2020)
Global Navigation Satellite Systems (GNSS) are the main source of position, navigation, and timing (PNT) information and will be a key player in the next-generation intelligent transportation systems and safety-critical applications, but several limi
Externí odkaz:
https://doaj.org/article/4b13307b4df04929a9f1042a4787c9ea