CN206135966U - High -efficient low -power consumption modulated circuit of AIS transmitter - Google Patents
High -efficient low -power consumption modulated circuit of AIS transmitter Download PDFInfo
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- CN206135966U CN206135966U CN201621185788.9U CN201621185788U CN206135966U CN 206135966 U CN206135966 U CN 206135966U CN 201621185788 U CN201621185788 U CN 201621185788U CN 206135966 U CN206135966 U CN 206135966U
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Abstract
The utility model discloses a high -efficient low -power consumption modulated circuit of AIS transmitter, it includes modulation unit, microprocessor and filtering unit, and microprocessor's control signal output is connected with modulation unit's control signal input, and modulation unit's feedback signal output is connected with control signal's current feedback input, and modulation unit's the microprocessor 1 output and the input of filtering unit are connected, and the GMSK signal is exported to the output of filtering unit, microprocessor control modulation unit produces radiofrequency signal, directly launches through the antenna through filtering. Microprocessor control modulation unit produces radiofrequency signal, directly launches through the antenna through filtering with after enlargeing, saves IF modulation circuit and radio frequency mixer circuit, and the circuit is with low costs, and the reliability is high.
Description
Technical field
This utility model is related to signal transmitting field, the efficient low-power consumption modulation circuit of especially a kind of AIS transmitters.
Background technology
Ship automatic identification system（AIS）It is a kind of marine navigation equipment, the measure of collision free between ship can be strengthened,
Strengthen ARPA radars, VTS, the function of ship report, all ship visualizations can be shown on electronic chart
Course, course line, the information such as name of vessel, reaching the function of improving maritime communication and providing a kind of ship carries out voice and textcommunication
Method, the global consciousness of ship can be strengthened.
In AIS baseband processing modules, GMSK Gaussian-filtered minimum shift keying（GMSK）Modulation /demodulation be need break through
Key technology.Modulation /demodulation has very important effect in wireless data transmission.Frequency spectrum shift can be carried out by modulation,
The frequency spectrum shift of modulated signal on the position for requiring, the modulated signal for being adapted to propagation is converted thereof into, and it is to system
The validity and reliability of transmission also has very big impact.
Modulation transmitter is an important step of AIS systems, according to the requirement of AIS systems, needs to produce GMSK letters
Number, information rate 9.6kb/s, BT values are 0.3 or 0.5, and conventional modulation chip is that CMX7042 or CMX589. adopts the modulation
Chip is produced GMSK baseband signals and is mixed with a local oscillator fixed by generation intermediate-freuqncy signal, intermediate-freuqncy signal are modulated to VCO again
Frequency is amplified by the excitation to radiofrequency signal and is amplified to transmission power finally by power amplification to radio frequency.Conventional AIS transmittings
Circuit is as shown in figure 1, as can be seen from the figure traditional AIS radiating circuits have following defect：First, circuit composition is complicated,
High cost；2nd, power consumption is high, big to the loss of battery in some stricter use environments of power supply power consumption requirement at sea.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of efficient low-power consumption of AIS transmitters is adjusted
Circuit processed, microprocessor control modulating unit produce radiofrequency signal, directly launched by antenna, save after filtered and amplification
Modulation circuit of intermediate frequency and radio frequency mixting circuit are removed, circuit cost is low, reliability is high.
The purpose of this utility model is achieved through the following technical solutions：The efficient low-power consumption modulation electricity of AIS transmitters
Road, it includes modulating unit, microprocessor and filter unit, the control signal output of microprocessor and the control of modulating unit
Signal input part connects, and the feedback signal output of modulating unit is connected with the feedback input end of control signal, modulating unit
RF signal output is connected with the input of filter unit, the outfan output GMSK signals of filter unit；Microprocessor control
Modulating unit processed produces radiofrequency signal, filtered directly to be launched by antenna.
Described modulating unit is ADF7012 modulation chips.
Described modulation circuit also includes amplifying unit, and the outfan of filter unit is connected with the input of amplifying unit,
The outfan output GMSK signals of amplifying unit.
Described ADF7012 modulation chips include five kinds of modulation schemes：Binary Frequency Shift Keying, Gaussian Frequency Shift Keying, two
System on-off keying, Gauss on-off keying and amplitude shift keying.
The electric current of described ADF7012 modulation chips only has 30mA/5V, and its output is up to 14dBm.
The typical quiescent current of described ADF7012 modulation chips is less than 0.1 μ A.
The beneficial effects of the utility model are：This utility model provides a kind of efficient low-power consumption modulation electricity of AIS transmitters
Road, microprocessor control modulating unit produce radiofrequency signal, are directly launched by antenna after filtered and amplification.Directly lead to
Cross ADF7012 modulation chips and produce radio frequency GMSK modulation signal, save modulation circuit of intermediate frequency and radio frequency mixting circuit, ADF7012
Electric current only has 30mA/5V, and its output can be up to 14dBm, can not enter to overdrive amplification and pushes directly on power amplification
Device, it is low in energy consumption；AIS transmission circuits are mainly used in the product for civilian use, to equipment cost, the product for civilian use requires that strictly circuit cost is low,
Reliability is high, can use in a large number in the product for civilian use.
Description of the drawings
Fig. 1 is conventional AIS radiating circuit theory diagrams；
Fig. 2 is modulation circuit theory diagram of the present utility model.
Specific 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 described below.
As shown in Fig. 2 the efficient low-power consumption modulation circuit of AIS transmitters, it includes that modulating unit, microprocessor and filtering are single
Unit, the control signal output of microprocessor are connected with the control signal input of modulating unit, the feedback signal of modulating unit
Outfan is connected with the feedback input end of control signal, and the RF signal output of modulating unit is connected with the input of filter unit
Connect, the outfan output GMSK signals of filter unit；Microprocessor control modulating unit produces radiofrequency signal, filtered directly to lead to
Cross antenna to be launched.
Described modulating unit is ADF7012 modulation chips.
Described modulation circuit also includes amplifying unit, and the outfan of filter unit is connected with the input of amplifying unit,
The outfan output GMSK signals of amplifying unit.
ADF7012 modulation chips are a low-power consumption ASK/FSK/GFSK UHF transmitters.Output, output channel,
Deviation frequency and modulation type can be arranged by 4 32 bit registers programmings.Using fractional-N divide and with external inductors
VCO, can select any frequency in the ghz bands of 50 MHz to 1.Fractional-N divide PLL has fast lock time characteristic, because
This ADF7012 is adapted to quick frequency hopping system.Precise frequency offsets and PLL phase noise performances also contribute to narrow-band operation.Have five
Plant different modulation schemes available：Binary Frequency Shift Keying (FSK), Gaussian Frequency Shift Keying (GFSK), binary switch key
Control (OOK), Gauss on-off keying (GOOK) and amplitude shift keying (ASK).Offset registers allow output with the step less than 1 ppm
Enter movement, such that it is able to indirect compensation be carried out to the frequency error in reference crystal.Depositor passes through a simple three-wire type
Interface is controlled.In a power-save mode, the typical quiescent current of the device is less than 0.1 μ A.The electric current of ADF7012 modulation chips
Only 30mA/5V, its output can be up to 14dBm, can push directly on power amplifier without amplification is overdrive.
Claims (6)
- The efficient low-power consumption modulation circuit of 1.AIS transmitters, it is characterised in that：It includes that modulating unit, microprocessor and filtering are single Unit, the control signal output of microprocessor are connected with the control signal input of modulating unit, the feedback signal of modulating unit Outfan is connected with the feedback input end of control signal, and the RF signal output of modulating unit is connected with the input of filter unit Connect, the outfan output GMSK signals of filter unit；Microprocessor control modulating unit produces radiofrequency signal, filtered directly to lead to Cross antenna to be launched.
- 2. the efficient low-power consumption modulation circuit of AIS transmitters according to claim 1, it is characterised in that：Described modulation list Unit is ADF7012 modulation chips.
- 3. the efficient low-power consumption modulation circuit of AIS transmitters according to claim 1, it is characterised in that：Described modulation electricity Road also includes amplifying unit, and the outfan of filter unit is connected with the input of amplifying unit, the outfan output of amplifying unit GMSK signals.
- 4. the efficient low-power consumption modulation circuit of AIS transmitters according to claim 2, it is characterised in that：Described ADF7012 Modulation chip includes five kinds of modulation schemes：Binary Frequency Shift Keying, Gaussian Frequency Shift Keying, binary switch keying, Gauss switch Keying and amplitude shift keying.
- 5. the efficient low-power consumption modulation circuit of AIS transmitters according to claim 2, it is characterised in that：Described ADF7012 The electric current of modulation chip only has 30mA/5V, and its output is up to 14dBm.
- 6. the efficient low-power consumption modulation circuit of AIS transmitters according to claim 2, it is characterised in that：Described ADF7012 The typical quiescent current of modulation chip is less than 0.1 μ A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621185788.9U CN206135966U (en) | 2016-11-04 | 2016-11-04 | High -efficient low -power consumption modulated circuit of AIS transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621185788.9U CN206135966U (en) | 2016-11-04 | 2016-11-04 | High -efficient low -power consumption modulated circuit of AIS transmitter |
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| CN206135966U true CN206135966U (en) | 2017-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621185788.9U Active CN206135966U (en) | 2016-11-04 | 2016-11-04 | High -efficient low -power consumption modulated circuit of AIS transmitter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115086125A (en) * | 2022-08-11 | 2022-09-20 | 深圳市华普微电子有限公司 | Low-power consumption modulation method for micro frequency hopping multiple access communication system |
-
2016
- 2016-11-04 CN CN201621185788.9U patent/CN206135966U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115086125A (en) * | 2022-08-11 | 2022-09-20 | 深圳市华普微电子有限公司 | Low-power consumption modulation method for micro frequency hopping multiple access communication system |
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