Method, device and system of multi-carrier constant envelope GNSS waveforms compatible with existing user equipment

Patent metadata

Field	Value
Publication number	US-12474481-B2
Application number	US-202218072866-A
Country	US
Kind code	B2
Filing date	Dec 1, 2022
Priority date	Dec 1, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A global navigation satellite system (GNSS) is disclosed comprising a transmitter. The transmitter is configured to: receive a plurality of frequencies; determine a minimum frequency from the plurality of frequencies; determine a maximum frequency from the plurality of frequencies; determine a carrier from the minimum frequency and the maximum frequency; determine a set of subcarriers from the carrier and the plurality of frequencies; identify optimal radius of desired phase points to select optimal subcarriers from the set of subcarriers; determine inter-modulation terms with a minimal energy based on the optimal subcarriers; and generate multi-carrier constant envelope waveforms based on the inter-modulation terms.

First claim

What is claimed is:

1 . A global navigation satellite system (GNSS) comprising a transmitter, the transmitter configured to:
receive a plurality of frequencies; determine a minimum frequency from the plurality of frequencies; determine a maximum frequency from the plurality of frequencies; determine a carrier from the minimum frequency and the maximum frequency; determine a set of subcarriers from the carrier and the plurality of frequencies; identify optimal radius of desired phase points to select optimal subcarriers from the set of subcarriers; determine inter-modulation terms with a minimal energy based on the optimal subcarriers; and generate multi-carrier constant envelope waveforms based on the inter-modulation terms.

2 . The GNSS of claim 1 , wherein the carrier is an average of the minimum frequency and the maximum frequency.

3 . The GNSS of claim 1 , wherein the set of subcarriers is determined by subtracting the carrier from each of the plurality of frequencies.

4 . The GNSS of claim 1 , wherein the inter-modulation terms with the minimal energy are capable of ensuring a constant envelope property and keeping original phases.

5 . The GNSS of claim 1 , wherein the multi-carrier constant envelope waveforms are capable of being demodulated using existing user equipment.

6 . The GNSS of claim 1 , wherein the plurality of frequencies include GPS L1, GPS L2 and/or GPS L5.

7 . A method implemented in a global navigation satellite system (GNSS) comprising a transmitter, the method comprising:
receiving a plurality of frequencies; determining a minimum frequency from the plurality of frequencies; determining a maximum frequency from the plurality of frequencies; determining a carrier from the minimum frequency and the maximum frequency; determining a set of subcarriers from the carrier and the plurality of frequencies; identifying optimal radius of desired phase points to select optimal subcarriers from the set of subcarriers; determining inter-modulation terms with a minimal energy based on the optimal subcarriers; and generating multi-carrier constant envelope waveforms based on the inter-modulation terms.

8 . The method of claim 7 , wherein the carrier is an average of the minimum frequency and the maximum frequency.

9 . The method of claim 7 , wherein the set of subcarriers is determined by subtracting the carrier from each of the plurality of frequencies.

10 . The method of claim 7 , wherein the inter-modulation terms with the minimal energy are capable of ensuring a constant envelope property and keeping original phases.

11 . The method of claim 7 , wherein the multi-carrier constant envelope waveforms are capable of being demodulated using existing user equipment.

12 . The method of claim 7 , wherein the plurality of frequencies include GPS L1, GPS L2 and/or GPS L5.

13 . A non-transitory computer readable medium having instructions stored thereon that, when executed by a computer device, cause the computer device to perform a method implemented in a global navigation satellite system (GNSS) comprising a transmitter, the method comprising:
receiving a plurality of frequencies; determining a minimum frequency from the plurality of frequencies; determining a maximum frequency from the plurality of frequencies; determining a carrier from the minimum frequency and the maximum frequency; determining a set of subcarriers from the carrier and the plurality of frequencies identifying optimal radius of desired phase points to select optimal subcarriers from the set of subcarriers; determining inter-modulation terms with a minimal energy based on the optimal subcarriers; and generating multi-carrier constant envelope waveforms based on the inter-modulation terms.

14 . The non-transitory computer readable medium of claim 13 , wherein the carrier is an average of the minimum frequency and the maximum frequency.

15 . The non-transitory computer readable medium of claim 13 , wherein the set of subcarriers is determined by subtracting the carrier from each of the plurality of frequencies.

16 . The non-transitory computer readable medium of claim 13 , wherein the inter-modulation terms with the minimal energy are capable of ensuring a constant envelope property and keeping original phases.

17 . The non-transitory computer readable medium of claim 13 , wherein the plurality of frequencies include GPS L1, GPS L2 and/or GPS L5.

18 . The non-transitory computer readable medium of claim 13 , wherein the multi-carrier constant envelope waveforms are capable of being demodulated using existing user equipment.

Assignees

• Intelligent Fusion Tech Inc

Inventors

• Shen Dan
• Chen Genshe
• Nguyen Tien
• Pham Khanh

Classifications

• G01S19/32 Primary

  Multimode operation in a single same satellite system, e.g. GPS L1/L2 · CPC title

• G01S19/29 Primary

  carrier {including Doppler,} related {(G01S19/246 takes precedence)} · CPC title