US 2020/0393569 A1Published application

Transmission of satellite navigation message into multiple pages encoded for optimal retrieval at receiver in a fully interchangeable way

AssigneeThe European Union, Represented By the European Commission

InventorIgnacio FERNÀNDEZ-HERNÀNDEZ

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Abstract

Described herein is a method for improving the reception of a satellite navigation message divided in several pages and transmitted by one or several satellites. A satellite navigation message M of k pages is encoded in n pages, and any k retrieved pages from any satellite enables decoding of the original satellite navigation message M. An implementation of the method uses parallel block encoding for a binary erasure channel with high parity and zero overhead, where symbols at a fixed position of all pages are encoded in parallel into shorter codes. This method achieves full page interchangeability in the message transmission, optimizes message reception and reduces decoding cost.

Claims12

Dependent claims

A method of generating an encoded satellite navigation message, in the form of a number of pages, for transmission to at least one user receiver via a plurality of satellites, the method comprising the steps of:

a) dividing, at a ground station, a satellite navigation message M into k pages;
b) dividing, at the ground station, each page into j symbols, the satellite navigation message M being divided into k×j symbols;
c) for each symbol position, encoding the symbols of the k pages at the ground station by encoding each column of the symbols of the pages separately for a total of j block codes, wherein each of n pages comprises symbols from j parallel codes;
d) generating, at the ground station, an encoded satellite navigation message M′ for the n pages;
e) allocating, at the ground station, at least a subset of the n pages of the encoded satellite navigation message to each of the plurality of satellites;
f) transmitting, by the ground station, the allocated pages to respective ones of the plurality of satellites;
and
g) transmitting the allocated pages by the plurality of satellites to the at least one user receiver.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/971,649Filed 3 Oct 2019
Priority: EP 18199280.19 Oct 2018
Published: 17 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01S 19/246
Acquisition or tracking or demodulation of signals transmitted by the system: involving long acquisition integration times, extended snapshots of…
G01S 19/01
Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems: satellite radio…
G01S 19/24
Receivers: acquisition or tracking or demodulation of signals transmitted by the system
G01S 19/243
Acquisition or tracking or demodulation of signals transmitted by the system: demodulation of navigation message

Family

US 11,448,772 B2Related patent
US 2020/0393569 A1This patent

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