General binary migration carrier modulation method of satellite navigation system signal

A satellite navigation system, a technology of offset carrier, applied in the field of satellite navigation system, can solve the problems of signal structure limitation, signal code tracking, anti-multipath, anti-interference navigation signal compatibility is not ideal, etc.

Active Publication Date: 2012-06-27
SHANGHAI MARITIME UNIVERSITY
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Problems solved by technology

The binary offset carrier modulation can improve the signal performance by modulating the signal power to the side lobes on both sides of the carrier frequency, but the binary offset carrier modulation method given in the article requires that the time occupied by the chips of the modulated waveform must be equal, only The distance between the two main lobes can be adjusted by selecting parameters such as code rate and subcarrier rate. The signal structure is limited, and the signal's code tracking, anti-multipath, anti-jamming and compatibility with other navigation signals are in some cases not ideal

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  • General binary migration carrier modulation method of satellite navigation system signal
  • General binary migration carrier modulation method of satellite navigation system signal
  • General binary migration carrier modulation method of satellite navigation system signal

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[0038] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0039] like figure 1 , figure 2 and image 3 As shown, in this embodiment, firstly, according to the performance requirements and constraints of the navigation system, the frequency f of the spreading code is determined c =1.023MHz, subcarrier frequency f cs =1.023MHz, determine the variable parameter ρ=0.2 of modulation waveform, determine to adopt cosine type modulation; Then determine the number K of half-period subcarrier chips in a spread spectrum chip according to the determined spread spectrum code frequency and subcarrier frequency , to construct a cosine-type generalized binary offset carrier GBOC cos (f cs , f c , ρ) modulation, the specific steps are as follows:

[0040] Step 1: First, according to the requirements and constrain...

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Abstract

The invention discloses a general binary migration carrier modulation method of a satellite navigation system signal, which comprises the steps of changing the time occupied by a traditional modulation waveform chip binary value (plus 1 or minus 1) by utilizing a variable parameter Rho based on binary offset carrier modulation so as to realize the flexible modulation of the splitting degree of the existing binary offset carrier modulation mainlobe and the existing binary offset carrier modulation sidelobe and simultaneously realize the code tracking performance, the anti-interference performance, the anti-multipath performance and the compatibility of the signal.

Description

technical field [0001] The invention relates to a method in the technical field of satellite navigation systems, in particular to a generalized binary offset carrier modulation method for satellite navigation system signals. Background technique [0002] The navigation signal system is in the most critical position in the top-level design of the satellite navigation system. Its performance directly determines the navigation and positioning performance of the system. Navigation signal modulation is the most important thing in the design of the navigation signal system. Binary Offset Carrier (Binary Offset Carrier, referred to as BOC) is a new satellite navigation signal modulation method, J.W.Betz wrote "The Offset Carrier Modulation for GPS Modernization".Proceedings of the 1999National Technical Meeting of The Institute of Navigation, San Diego , USA, pp.639-648, January 1999. "GPS modern binary offset carrier modulation", the main lobe of its power spectrum is split into t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37G01S19/30G01S19/22G01S19/21
Inventor 刘卫胡媛战兴群高曼琪
Owner SHANGHAI MARITIME UNIVERSITY
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