CN206341238U - A kind of modulator for AIS systems - Google Patents
A kind of modulator for AIS systems Download PDFInfo
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- CN206341238U CN206341238U CN201621300016.5U CN201621300016U CN206341238U CN 206341238 U CN206341238 U CN 206341238U CN 201621300016 U CN201621300016 U CN 201621300016U CN 206341238 U CN206341238 U CN 206341238U
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- nrzi
- multiplier
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- encoding device
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Abstract
The utility model discloses a kind of modulator for AIS systems, it includes base band frame framing module, physical frame groups frame module, nrzi encoding device, the first multiplier, Gaussian filter, integrator, the second multiplier, DUC modules and oscillator；Baseband signal data after being handled by physical frame groups frame module enters nrzi encoding device, nrzi encoding device, which is converted to baseband signal, enters the first multiplier after NRZI codes, first multiplier generates NRZI pulse trains after NRZI codes are multiplied with cumulative signal, NRZI pulse trains enter Gaussian filter, NRZI pulse trains are processed as being transferred to integrator after Gaussian pulse train and added up by Gaussian filter, and the phase adjusted that the second multiplier carries out carrier signal is output to after generation integration phase signal.The utility model improves communication quality, the availability of frequency spectrum, can transmit intersymbol interference with control data, be conducive to accurately being demodulated judgement.
Description
Technical field
The utility model is related to ship automatic identification system field, specifically a kind of modulator for AIS systems.
Background technology
In early 20th century, marine communication relies primarily on radar scanning technic and confirmed to carry out ship positioning and course, still
Radar scanning has the following disadvantages：
（1）Collection accommodation and course data time delay is big, radar signal is easily influenceed by shelter, the easy distortion of signal；
（2）Gather signal data species few, it is impossible to meet the information interchange demand become increasingly abundant between ship；
（3）The transmitting and reception of radar signal are easily disturbed by ship around.
As marine transportation industry is continued to develop, in order to avoid occurring between ship and ship, between ship and bank base
Collision accident, occurs in that ship automatic identification system（Automatic Identification System）.AIS systems can
Recognize ship and assist to follow the trail of target, the information such as course, the course line of display ship can be visualized on electronic chart, are improved
The security of navigation, the exchange capacity and efficiency of navigation of overocean communications data, significantly reduce artificial exchange cost.
Publication No. CN102305936A Chinese patent discloses a kind of AIS ship oceangoing ship automatic positioning navigation system, and this is
The AIS bank bases Reference System, watercraft AIS navigation terminal equipment and multiple high-precise synchronizations that system includes precise synchronization are former
Secondary clock, the AIS bank bases Reference System includes multiple AIS bank bases reference stations, and self-organizing is shared and monopolizes a high accuracy
Synchronous atomic clock, navigation message and measurement carrier wave are sent by shared and exclusive AIS wireless channels；Watercraft AIS navigation terminal
Equipment includes wireless receiving module, signal measurement and process module and main control module, and wireless receiving module is responsible for receiving various navigation
Text and measurement carrier signal, and carrier wave measurement, text extraction and positioning calculation are carried out by signal measurement and process module, and will be fixed
Position result submits main control module, and output application is carried out by main control module.Using the invention, ship directly can be entered using AIS equipment
Row positioning, meets the space base and continental rise double copies alignment system demand of IMO propositions.
The invention does not disclose the signal modulation technique in the AIS systems described in it, changeable in face of becoming increasingly complex to show
For marine communication system, possess the direction that more abundant, powerful communication capacity is AIS System Developments, wherein signal modulation skill
Art is the key of base band signal process in AIS systems.With to AIS systems in the increase of VHF band communication demands, AIS systems
Usable frequency range it is very crowded, reached the occupancy to frequency range more than 50% at many busy harbours, world boat
Mark tissue（IALA）Propose when the load of AIS data link is more than 50%, it will the generation for the problems such as causing information occlusion, seriously
Influence navigation safety.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art there is provided a kind of modulator for AIS systems, with
At least up to improve the availability of frequency spectrum and the effect of communication quality.
The purpose of this utility model is achieved through the following technical solutions：A kind of modulator for AIS systems, it
Including base band frame framing module, physical frame groups frame module, nrzi encoding device, the first multiplier, Gaussian filter, integrator,
Paired multiplier, DUC modules and oscillator；The output end of base band frame framing module is connected with the input of physical frame groups frame module,
The output end of physical frame groups frame module is connected with the input of nrzi encoding device, the output end of nrzi encoding device and the first multiplier
Input connection, the input of the output end of the first multiplier and Gaussian filter connects, the output end of Gaussian filter with
The input connection of integrator, the output end of integrator is connected with the output end of the second multiplier, the output end of the second multiplier
It is connected with the input of DUC modules, the regulating frequency signal input part of DUC modules and the concussion frequency signal output end of oscillator
Connection；
Base band frame framing module is carried out after packet packing in transmission to baseband signal data, passes through the physical frame groups
Frame module carries out the baseband signal data after error detection, error correction and enters nrzi encoding device, and nrzi encoding device is converted to baseband signal
NRZI codes, NRZI codes enter the first multiplier, and the first multiplier generates NRZI pulses after being multiplied to NRZI codes and cumulative signal
Sequence, NRZI pulse trains enter Gaussian filter, and the NRZI pulse trains for being loaded with baseband signal are processed as by Gaussian filter
Integrator is transferred to after Gaussian pulse train to be added up, and the second multiplier is output to after obtaining integration phase signal q (t),
Carrier signal phase regulation is carried out in the second multiplier, baseband phase signal S is obtainedIAnd S (t)Q(t), SIAnd S (t)Q(t) signal
Into DUC modules, the frequency oscillation signal f of DUC modules and oscillatorcOutput end is connected, and DUC modules utilize frequency oscillation signal
fcAdjust SIAnd S (t)Q(t) output of AIS systems modulated signal is generated after signal.
Described Gaussian filter is Gauss low pass pre-modulation filter.
Described Gauss low pass pre-modulation filter controls intersymbol interference, regulation frequency spectrum special by modulated filter parameter
Property.
Described nrzi encoding device is used to realize is converted to NRZI codes by binary-coded baseband signal.
Described oscillator is voltage controlled oscillator.
The beneficial effects of the utility model are：The utility model is carried out using multiple multipliers at the combining of signal data
Reason, improves communication quality；Smothing filtering is carried out using Gaussian filter, the availability of frequency spectrum is improved；Filtered by adjusting Gauss
The parameter of ripple device can transmit intersymbol interference with control data, compress spectrum modulation signal, and the phase of front and rear code element is utilized in demodulation
Closing property can be demodulated judgement exactly.
Brief description of the drawings
Fig. 1 is signal modulation schematic diagram of the present utility model；
Fig. 2 is the utility model structural representation.
Embodiment
The technical solution of the utility model, but protection domain of the present utility model are described in further detail below in conjunction with the accompanying drawings
It is not limited to as described below.
Such as Fig. 1, shown in 2, a kind of modulator for AIS systems, it includes base band frame framing module, physical frame framing mould
Block, nrzi encoding device, the first multiplier, Gaussian filter, integrator, the second multiplier, DUC modules and oscillator；Base band frame
The output end of framing module is connected with the input of physical frame groups frame module, the output end and nrzi encoding of physical frame groups frame module
The input connection of device, the output end of nrzi encoding device is connected with the input of the first multiplier, the output end of the first multiplier
It is connected with the input of Gaussian filter, the output end of Gaussian filter and the input of integrator are connected, the output of integrator
End is connected with the output end of the second multiplier, and the output end of the second multiplier is connected with the input of DUC modules, DUC modules
The concussion frequency signal output end connection of regulating frequency signal input part and oscillator；
Base band frame framing module is carried out after packet packing in transmission to baseband signal data, passes through the physical frame groups
Frame module carries out the baseband signal data after error detection, error correction and enters nrzi encoding device, and nrzi encoding device is converted to baseband signal
NRZI codes, NRZI codes enter the first multiplier, and the first multiplier generates NRZI pulses after being multiplied to NRZI codes and cumulative signal
Sequence, NRZI pulse trains enter Gaussian filter, and the NRZI pulse trains for being loaded with baseband signal are processed as by Gaussian filter
Integrator is transferred to after Gaussian pulse train to be added up, and the second multiplier is output to after obtaining integration phase signal q (t),
Carrier signal phase regulation is carried out in the second multiplier, baseband phase signal S is obtainedIAnd S (t)Q(t), SIAnd S (t)Q(t) signal
Into DUC modules, the frequency oscillation signal f of DUC modules and oscillatorcOutput end is connected, and DUC modules utilize frequency oscillation signal
fcAdjust SIAnd S (t)Q(t) output of AIS systems modulated signal is generated after signal.
Described Gaussian filter is Gauss low pass pre-modulation filter.
Described Gauss low pass pre-modulation filter controls intersymbol interference, regulation frequency spectrum special by modulated filter parameter
Property.
Described nrzi encoding device is used to realize is converted to NRZI codes by binary-coded baseband signal.
Described oscillator is voltage controlled oscillator.
Above content only describes general principle of the present utility model and main feature.The technical staff of the industry should
Solve, do not departing from the spirit and scope that the utility model appended claims are limited, formally with it is right in details
The change that the utility model is made, in the utility model scope of the claimed protection.
Claims (5)
1. a kind of modulator for AIS systems, it is characterised in that：It include base band frame framing module, physical frame groups frame module,
Nrzi encoding device, the first multiplier, Gaussian filter, integrator, the second multiplier, DUC modules and oscillator；Base band frame framing
The output end of module is connected with the input of physical frame groups frame module, output end and the nrzi encoding device of physical frame groups frame module
Input is connected, and the output end of nrzi encoding device is connected with the input of the first multiplier, output end and the height of the first multiplier
The input of the input connection of this wave filter, the output end of Gaussian filter and integrator is connected, the output end of integrator with
The output end connection of second multiplier, the output end of the second multiplier is connected with the input of DUC modules, the regulation of DUC modules
Frequency signal input end and the concussion frequency signal output end of oscillator are connected；
Base band frame framing module is carried out after packet packing in transmission to baseband signal data, passes through the physical frame framing mould
Block carries out the baseband signal data after error detection, error correction and enters nrzi encoding device, and baseband signal is converted to NRZI by nrzi encoding device
Code, NRZI codes enter the first multiplier, and the first multiplier generates NRZI pulse trains after being multiplied to NRZI codes and cumulative signal,
NRZI pulse trains enter Gaussian filter, and the NRZI pulse trains for being loaded with baseband signal are processed as Gauss arteries and veins by Gaussian filter
Rush after sequence and be transferred to integrator and added up, the second multiplier is output to after obtaining integration phase signal q (t), second
Multiplier carries out carrier signal phase regulation, obtains baseband phase signal SIAnd S (t)Q(t), SIAnd S (t)Q(t) signal enters
The frequency oscillation signal f of DUC modules, DUC modules and oscillatorcOutput end is connected, and DUC modules utilize frequency oscillation signal fcAdjust
Save SIAnd S (t)Q(t) output of AIS systems modulated signal is generated after signal.
2. a kind of modulator for AIS systems according to claim 1, it is characterised in that：Described Gaussian filter
For Gauss low pass pre-modulation filter.
3. a kind of modulator for AIS systems according to claim 2, it is characterised in that：Described Gauss low pass is pre-
Modulated filter controls intersymbol interference, regulation spectral characteristic by modulated filter parameter.
4. a kind of modulator for AIS systems according to claim 1, it is characterised in that：Described nrzi encoding device
Binary-coded baseband signal is converted into NRZI codes for realizing.
5. a kind of modulator for AIS systems according to claim 1, it is characterised in that：Described oscillator is pressure
Controlled oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621300016.5U CN206341238U (en) | 2016-11-30 | 2016-11-30 | A kind of modulator for AIS systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621300016.5U CN206341238U (en) | 2016-11-30 | 2016-11-30 | A kind of modulator for AIS systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206341238U true CN206341238U (en) | 2017-07-18 |
Family
ID=59307829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621300016.5U Expired - Fee Related CN206341238U (en) | 2016-11-30 | 2016-11-30 | A kind of modulator for AIS systems |
Country Status (1)
| Country | Link |
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| CN (1) | CN206341238U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115801521A (en) * | 2023-01-10 | 2023-03-14 | 交通运输部规划研究院 | AIS baseband signal processing method based on FPGA |
-
2016
- 2016-11-30 CN CN201621300016.5U patent/CN206341238U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115801521A (en) * | 2023-01-10 | 2023-03-14 | 交通运输部规划研究院 | AIS baseband signal processing method based on FPGA |
| US12009953B1 (en) | 2023-01-10 | 2024-06-11 | Transport Planning and Research Institute Ministry of Transport | Method for processing automatic identification system (AIS) baseband signal based on field-programmable gate array (FPGA) |
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| GR01 | Patent grant | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: No.2 Tianyu Road, high tech Zone, Chengdu, Sichuan 610000 Patentee after: GUORONG TECHNOLOGY CO.,LTD. Address before: No.2 Tianyu Road, high tech Zone, Chengdu, Sichuan 610000 Patentee before: CHENGDU GUORONG TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220706 Address after: 518000 404, building 37, chentian Industrial Zone, chentian community, Xixiang street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Huaxun ark Photoelectric Technology Co.,Ltd. Address before: No.2 Tianyu Road, high tech Zone, Chengdu, Sichuan 610000 Patentee before: GUORONG TECHNOLOGY CO.,LTD. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170718 |