US 12,259,480 B2
Method and system for providing authentication to GNSS open service signals and interoperable secure positioning
Sergey Lyusin, Moscow (RU); and Nobuhiro Kishimoto, Hyogo (JP)
Assigned to Magellan Systems Japan, Inc., Amagasaki (JP)
Filed by Magellan Systems Japan, Inc., Hyogo (JP)
Filed on Oct. 6, 2022, as Appl. No. 17/961,154.
Application 17/961,154 is a continuation of application No. PCT/IB2021/052499, filed on Mar. 25, 2021.
Claims priority of provisional application 63/007,788, filed on Apr. 9, 2020.
Prior Publication US 2023/0028995 A1, Jan. 26, 2023
Int. Cl. G01S 19/24 (2010.01); G01S 19/31 (2010.01)
CPC G01S 19/243 (2013.01) [G01S 19/31 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for providing authentication mechanism to open service signals in Global Navigation Satellite Systems (GNSS), the method comprising:
inverting a plurality of bits in a pseudorandom noise code in a GNSS signal having a predetermined period of a binary bit sequence of N bits (N: a natural number), a position of each inverted bit in the binary bit sequence being specified by a serial number generated for each period using a cryptographic pseudorandom number generator, whereby at least one of the position of the inverted bit and a number of the inverted bits in the period varies period by period; and
providing a decryption key to a GNSS receiver having a corresponding cryptographic pseudorandom number generator.