An Offset Carrier Modulation Method Based on Generalization of Raised Cosine Pulse in Time Domain

A time-domain raised cosine, offset carrier technology, applied in the field of satellite navigation system signal modulation, can solve the problems of signal code tracking performance, anti-multipath and anti-interference capabilities are not ideal, power amplifier efficiency is reduced, etc. The effect of fast network attenuation, low code tracking error and high energy concentration

Active Publication Date: 2018-06-12
HARBIN ENG UNIV
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Problems solved by technology

The BOC modulation method given in the article will lead to a large out-of-band side lobe, which will reduce the efficiency of the power amplifier, and the code tracking performance, anti-multipath and anti-interference capabilities of the signal are still not ideal

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  • An Offset Carrier Modulation Method Based on Generalization of Raised Cosine Pulse in Time Domain
  • An Offset Carrier Modulation Method Based on Generalization of Raised Cosine Pulse in Time Domain
  • An Offset Carrier Modulation Method Based on Generalization of Raised Cosine Pulse in Time Domain

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0049] The present invention proposes an offset carrier modulation method (GeneralizedTime Domain Raised Cosine-Binary Offset Carrier, GTDRC-BOC(n,m,ρ)) based on time-domain raised cosine pulse generalization, which not only provides navigation signal design It provides more choices, and can effectively reduce the large side lobe of the power spectrum, reduce the interference to adjacent signals, and improve the power efficiency of navigation signals. At the same time, it has better code tracking performance, anti-multipath and anti- The jamming capability provides a new option for the signal waveform design of our country's future Compass satellite navigation system.

[0050] The object of the present invention is to propose a kind of offset carrier modulation method based on time-domain raised cosine pulse generalization, and its realization process is as f...

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Abstract

The invention discloses an offset carrier wave modulation method based on time domain raised cosine pulse generalization. The realization process is as follows: first of all, a spread spectrum code period, a subcarrier period, a sine or cosine type subcarrier modulation mode and time domain raised cosine pulse waveform variable parameters are determined, a sine or cosine phase subcarrier modulated waveform based on the time domain raised cosine pulse generalization is constructed, then, spectrum spreading is performed on navigation signals by use of a pseudo random sequence, subcarrier modulation is then carried out, and finally, carrier wave modulation of orthogonal branches is performed on obtained signals. According to the invention, the generated signals are constant in amplitude, the splitting degrees of main lobes and sidelobes of a signal power spectrum can be flexibly adjusted, and the navigation signals are enabled to have good code tracking performance, an anti-interference and anti-multipath capability and a capability of being compatible with other system signals. At the same time, large-amplitude sidelobes are prevented, the efficacy of a frequency spectrum is improved, and the method is especially suitable for satellite navigation service which employs an efficient nonlinear amplifier and has limited power and bandwidth.

Description

technical field [0001] The invention belongs to the field of satellite navigation system signal modulation, in particular to an offset carrier modulation method based on time-domain raised cosine pulse generalization. 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. In order to enable multiple signals to better share the limited frequency band of the Global Navigation Satellite System (GNSS), and to further improve the ranging accuracy and anti-interference performance of the signal, new signal modulation methods are constantly emerging. Binary Offset Carrier (Binary Offset Carrier, BOC(n,m)) is a new modulation method that can meet the above requirements, in which the frequency ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/01
CPCG01S19/01
Inventor 赵旦峰孙岩博薛睿曹庆铭
Owner HARBIN ENG UNIV
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