公开(公告)号：US20220209849A1

公开(公告)日：2022-06-30

申请号：US17618736

申请日：2020-06-10

Applicant: AIRBUS DEFENCE AND SPACE SAS

Inventor： Thibault MAISONNAT ,  Benjamin GADAT

IPC: H04B7/185 ,  H04L1/00 ,  H04L7/00

Abstract: A method for receiving an ADS-B message is disclosed including a synchronisation phase for detecting the start of the message and a decoding phase for recovering a bit stream corresponding to a block of data in the message. The synchronisation phase is based on determining a sequence of log-likelihood ratios having the greatest likelihood of corresponding to a sequence of symbols expected from a preamble of the message. Each log-likelihood ratio corresponds to a ratio between the respective probabilities that a symbol of the signal received corresponds to one of two possible values for a symbol. The decoding phase applies a belief propagation algorithm to a sequence of log-likelihood ratios respectively associated with the symbols in the block of data in the message, with an optimised parity matrix of the cyclic redundancy code of the message.

公开(公告)号：US20220320719A1

公开(公告)日：2022-10-06

申请号：US17628108

申请日：2020-07-10

Applicant: AIRBUS DEFENCE AND SPACE SAS ,  AIRBUS SAS

Inventor： Thibault MAISONNAT ,  Eric PEYRUCAIN ,  Alain LAGARRIGUE ,  Valery GINEST

IPC: H01Q1/28 ,  H01Q21/06 ,  H01Q21/28

Abstract: A method for arranging a set of antennas capable of transmitting or receiving in a radio frequency range in an existing aerodyne implemented either during an initial installation operation, or in a subsequent maintenance or update operation is disclosed. The method includes removing at least one component of a structural element external to the bearing surface of the existing aerodyne, the component being substantially transparent to the radio frequency range; installing the set of antennas in a zone exposed by the removal in the step; fitting an electronic and electrical harness connecting the set of antennas to a radio communications system and to a power supply inside the fuselage; re-forming the external structural element in such a way as to cover the installed set of antennas.