US 12,334,973 B1
Designed method for satellite navigation signal system with mixed modulation of direct spread spectrum and frequency hopping
Wei Xiao, Changsha (CN); Wenxiang Liu, Changsha (CN); Feixue Wang, Changsha (CN); Xiaozhou Ye, Changsha (CN); Pengcheng Ma, Changsha (CN); Zukun Lu, Changsha (CN); Zongnan Li, Changsha (CN); Guangfu Sun, Changsha (CN); Xiaomei Tang, Changsha (CN); Muzi Yuan, Changsha (CN); Honglei Lin, Changsha (CN); and Sixin Wang, Changsha (CN)
Assigned to NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY, Changsha (CN)
Filed by NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY, Changsha (CN)
Filed on Jan. 16, 2025, as Appl. No. 19/023,784.
Application 19/023,784 is a continuation of application No. PCT/CN2024/138743, filed on Dec. 12, 2024.
Claims priority of application No. 202411054147.9 (CN), filed on Aug. 2, 2024.
Int. Cl. H04B 1/7115 (2018.01); H04B 1/7073 (2011.01); H04B 1/713 (2011.01); H04L 25/03 (2006.01)
CPC H04B 1/70735 (2013.01) [H04B 1/713 (2013.01); H04L 25/03898 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A design method for a satellite navigation signal system with mixed modulation of direct spread spectrum and frequency hopping, wherein a navigation signal comprises multipath signal components and the method comprises:
acquiring design requirements of multipath signal components, wherein the design requirements of the multipath signal components comprise: baseband code sequence generation design, signal separation and recombination design, frequency hopping modulation design and direct spread spectrum signal generation design;
designing a baseband code sequence generation of the multipath signal components as follows: modulating a spread spectrum code sequence of the multipath signal components, followed by mixing and multiplexing with signal components corresponding to a same frequency point, and forming the baseband code sequence according to a power ratio of each path of signal components;
separating the signal components corresponding to the baseband code sequence according to navigation signal receiving environment conditions to obtain multipath separated radio frequency signals;
carrying out signal recombination modulation on the multipath separated radio frequency signals, wherein if separated radio frequency signals corresponding to a current communication path are authorized signals, a frequency hopping pattern is controlled through a frequency hopping code sequence, and a mixed frequency synthesis modulation is carried out according to a central frequency point of the frequency hopping pattern and a frequency of the authorized signals to obtain multipath modulated recombined signal components; if separated radio frequency signals corresponding to the current communication path are unauthorized signals, a direct combined radio frequency modulation is performed according to a preset signal frequency point and a frequency of the unauthorized signals to obtain multipath modulated recombined signal components; and amplifying a signal power of each path of modulated recombined signal components according to a center frequency point difference of the multipath modulated recombined signal components to obtain multipath direct spread spectrum navigation signals for transmission.