US 12,474,481 B2
Method, device and system of multi-carrier constant envelope GNSS waveforms compatible with existing user equipment
Dan Shen, Germantown, MD (US); Genshe Chen, Germantown, MD (US); Tien Nguyen, Germantown, MD (US); and Khanh Pham, Kirtland AFB, NM (US)
Assigned to INTELLIGENT FUSION TECHNOLOGY, INC., Germantown, MD (US)
Filed by Intelligent Fusion Technology, Inc., Germantown, MD (US)
Filed on Dec. 1, 2022, as Appl. No. 18/072,866.
Prior Publication US 2024/0219579 A1, Jul. 4, 2024
Int. Cl. G01S 19/29 (2010.01); G01S 19/32 (2010.01)
CPC G01S 19/29 (2013.01) [G01S 19/32 (2013.01)] 18 Claims
OG exemplary drawing
 
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.