Improved binary-coded character modulation method of satellite navigation system signals

A satellite navigation system and binary coding technology, applied in the field of satellite navigation systems, can solve the problems of signal code tracking, unsatisfactory anti-multipath and anti-jamming compatibility, and reduced power amplifier efficiency.

Inactive Publication Date: 2011-04-27
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Binary-coded symbol modulation is used to improve signal performance by modulating the signal power onto the side lobes of the carrier frequency, but the binary-coded symbol modulation method given in the article will bring o

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  • Improved binary-coded character modulation method of satellite navigation system signals
  • Improved binary-coded character modulation method of satellite navigation system signals
  • Improved binary-coded character modulation method of satellite navigation system signals

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Embodiment Construction

[0027] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0028] Such as figure 2 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, determine the number K=4 that needs to split the unit, select symbol [s 0 ,s 1 ,...,s K-1 ]=[-1,1,1,1]; then according to the determined spreading code frequency f c Determine the modulation waveform of the spread spectrum symbol, and construct the improved binary coded symbol modulation M-BCS ([-1, 1, 1, 1], 1), the specific steps are as follows:

[0029] Step 1: First, according to the requirements ...

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Abstract

The invention relates to an improved binary-coded character modulation method of satellite navigation system signals, belonging to the technical field of satellite navigation. On the basis of binary-coded characters, the traditional spread spectrum character is split into K units; each unit uses the character pulse waveform based on MSK (minimum shift keying) instead of the binary value waveform; and proper parameters are selected, thereby having the advantages of interference rejection, multipath resistance and compatibility of the binary-coded character, realizing the constant enveloping of MSK modulation, enhancing the efficiency of the power amplifier, realizing large side lobe attenuation and the like. The invention uses the improved binary-coded character modulation to enhance the code tracking performance, multipath resistance, interference rejection and compatibility with other navigation signals, thereby realizing constant enveloping of signals and avoiding the occurrence of large-amplitude side lobes.

Description

technical field [0001] The invention relates to a method in the technical field of satellite navigation systems, in particular to an improved binary code symbol modulation method for satellite navigation system signals. Background technique [0002] The quality of the signal system performance of the satellite navigation system directly determines the navigation and positioning performance of the system, and the navigation signal modulation is one of the keys in the design of the navigation signal system. Binary Coded Symbol (BCS for short) is a new navigation signal modulation method, C.J.Hegarty, J.W.Betz, A.Saidi wrote "Binary Coded Symbol Modulations for GNSS". Proceedings of ION NTM 2005, San Diego, USA, pp.56-64, January2005. "Global satellite navigation system binary code symbol modulation", by selecting appropriate parameters to improve signal related performance, such as anti-jamming and anti-multipath capabilities of navigation systems, especially in the current ra...

Claims

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Application Information

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IPC IPC(8): G01S19/37G01S19/21
Inventor 战兴群刘卫翟传润杜刚刘莉牛满仓张炎华
Owner SHANGHAI JIAO TONG UNIV
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