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Adjustable width sinusoidal binary offset carrier modulation method

A sine pulse and time width technology, applied in the field of satellite navigation system signal realization, can solve problems such as limiting the flexibility of signal waveform design

Active Publication Date: 2015-12-02
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modulation method proposed in the article requires that the duration of the modulated waveform chips must be equal, and the distance between the two main lobes can only be adjusted by selecting the frequency of the spreading code and the frequency of the subcarrier, which greatly limits the signal waveform Design flexibility

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  • Adjustable width sinusoidal binary offset carrier modulation method
  • Adjustable width sinusoidal binary offset carrier modulation method
  • Adjustable width sinusoidal binary offset carrier modulation method

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0047] figure 1 , figure 2 and image 3 Respectively, the AWSBOC signal modulation model proposed by the present invention, the flow chart of the implementation method and the subcarrier modulation waveform, wherein figure 1 The definitions of the symbols in are as follows:

[0048] d(t): navigation signal data channel information;

[0049] p(t): pilot channel information;

[0050] a l : Pseudo-random spreading code sequence of the in-phase branch;

[0051] b l : Pseudo-random spreading code sequence of the orthogonal branch;

[0052] rec(t): rectangular gate function;

[0053] x S-sub (t, ρ): the sine phase subcarrier modulation waveform;

[0054] x C-sub (t, ρ): said cosine phase subcarrier modulation waveform;

[0055] m AWSBOC (t, ρ): the sine pulse offset carrier modulation signal based on the adjustable time width;

[0056] f c : spread...

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Abstract

The invention aims to provide an adjustable width sinusoidal binary offset carrier modulation (AWSBOC (m, n, Rho)) method, comprising the processes of: first, determining a spreading code frequency fc, a subcarrier frequency fsc, a sine or cosine subcarrier modulation mode and a sinusoidal wave variable parameter Rho, and constructing sine or cosine phase subcarrier modulation waves in spreading code chip intervals; and second, utilizing a pseudorandom sequence to perform spread spectrum on navigation signals, then performing subcarrier modulation, and finally performing orthogonal branch carrier wave modulation on obtained signals. The signals generated in the method can flexibly adjust the main lobe and side lobe split degree of a signal power spectrum, thereby allowing the navigation signals to possess the characteristics of good code tracking performance, high anti-interference and anti-multipath capability, and great compatible capability with signals of other systems.

Description

Technical field: [0001] The invention relates to a method for realizing a signal of a satellite navigation system, in particular to a modulation method based on a sinusoidal pulse offset carrier with adjustable time width. Background technique [0002] The navigation modulation signal waveform is a key link in the design of the navigation signal system. The signal waveform affects the performance of the navigation system by affecting the autocorrelation function and power spectrum of the navigation signal. 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 of the spreading code is m×1.023MHz, and the frequency ...

Claims

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Application Information

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IPC IPC(8): H04L27/30G01S19/01G01S19/02
CPCG01S19/015G01S19/02H04L27/30
Inventor 赵旦峰孙岩博薛睿曹庆铭
Owner HARBIN ENG UNIV
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