Ranging system of discontinuous aperiodic signal based on gmsk modulation

A technology of aperiodic signal and ranging system, which is applied in the field of wireless navigation and can solve the problems of non-continuous and aperiodic signals.

Inactive Publication Date: 2016-01-20
DALIAN MARITIME UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing distance measurement and positioning systems are all based on continuous periodic signals, which are easy to realize the distance measurement function. However, communication systems such as AIS and GSM use the GMSK debugging method. The modulated signal is not a single frequency, and the system operates between two There will be random time intervals between communications, that is to say, the communication signal is non-continuous and non-periodic

Method used

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  • Ranging system of discontinuous aperiodic signal based on gmsk modulation
  • Ranging system of discontinuous aperiodic signal based on gmsk modulation
  • Ranging system of discontinuous aperiodic signal based on gmsk modulation

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) AIS base station transmits signal

[0026] The AIS base station transmitting equipment starts from the beginning of the time slot at 10:46 UTC on March 20, 2013, and sends out a 24-bit prior sequence (010101010101010101010101), an 8-bit start flag (01111110), and a 15-bit M sequence ( 111101011001000), message number (20), AIS base station MMSI (04113125), latitude (3843.563792), longitude (12125.267379), altitude (0095.3758).

[0027] (2) Ship AIS terminal equipment receives signal ranging

[0028] Firstly, through the decoding module 15 in the digital intermediate frequency signal processor 10, the a priori sequence and the start flag bit are analyzed to realize rough tracking of the input signal, and then 32 M-sequences with a delay interval of 10us and the signal after stripping the carrier are generated Perform correlation calculations to obtain 32 sets of correlation values, and the processor 16 restores the correlation characteristic curve of the M sequence ...

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Abstract

A ranging system based on GMSK -based non -continuous and non -periodic signals, including base station launch systems, high -precision synchronization atomic clocks and receiving machine terminal equipment.In the middle of the position and the electronic text information, a fixed M sequence is generated. The electronic text information will contain the time information of the M series starting time.When parsing the starting logo of the electrical text, the M sequence generated by the m -generated module generated by the m sequence is used to delay the sequence of multiple interval delay when the Mi sequence is generated by multiple delay modules.Get multiple correlation values.The processor restores the related characteristic curve of the M sequence according to the relevant values, and the transmission delay of the signal can be determined, and the ranging value can be obtained.The use of the invention can be ranging based on the GMSK modulation signal, laying the foundation for the positioning function of the GMSK communication system.

Description

technical field [0001] The invention belongs to the field of wireless navigation, relates to the cross-applied subject of land-based positioning and wireless communication, and specifically relates to a distance measuring system based on non-continuous non-periodic signals based on Gaussian filtered minimum shift keying modulation (GMSK, Gaussian filtered Minimum Shift Keying). Background technique [0002] GMSK signal has very good spectrum and power characteristics, which can improve the spectrum utilization rate and communication quality of the system, so it is widely used in automatic identification system (AIS, Automatic identification System), global mobile communication (GSM, Global System of Mobile communication) and other communication systems. The fragility of satellite navigation systems and people's needs for positioning in complex environments such as indoors and severe weather determine that it is very meaningful to study the addition of navigation and positioni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S11/08
Inventor 孙晓文胡伟张淑芳
Owner DALIAN MARITIME UNIVERSITY
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