CN103020665B - A kind of for acoustics tag read system under water - Google Patents
A kind of for acoustics tag read system under water Download PDFInfo
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Abstract
The present invention discloses a kind of for acoustics tag read system under water, comprise and controlling and processing unit, transceiver module, power management module, interface circuit, mixed-media network modules mixed-media and display module, control to be connected with processing unit and transceiver module, control transceiver module and send signal, and the direct wave received transceiver module and target echo carry out data processing; Described interface circuit is connected with processing unit with control, sets up the connection controlled with processing unit and outer welding system; Described mixed-media network modules mixed-media is connected with processing unit with control by interface circuit, sets up control and processing unit and the remote computer connection by network; Described display module is connected with processing unit with control by interface circuit, and is controlling to show data under the control with processing unit; Described power management module is controlling to power for each parts under the control with processing unit.This kind of read-write system can obtain some details of target simply, fast, in large quantities.
Description
Technical field
The invention belongs to oceanographic engineering field, particularly a kind of design for acoustics read-write system under water, mainly realize carrying out read-write operation to acoustics label in conjunction with RFID technique.
Background technology
In recent years, due to requirement that is military and ocean development, people start the research more and more paying attention to underwater communication technology.Due to multipath effect, time-varying effecting, the feature such as available band is narrow, signal attenuation is serious of underway, make electromagnetic wave not easily at water transmission, and sound wave is the mankind's known unique form of energy can propagated in water medium and long distance up to now, all mainly utilize sound wave so detect in ocean, communicate, locate and navigate, the sonar thus based on sound wave is also more and more widely used.Sonar is a kind of a kind of device that can obtain submarine target information, and first it launch an acoustical signal, and then determines some information of target by the echo receiving acoustical signal scattering.This method can detect submarine target effectively, classify, locate and tracking etc., but the calculating that this process need is a large amount of, react slower, also higher to hardware requirement, above-mentioned several aspect is also only limitted to the acquisition of target information simultaneously, to target, some are more, more specifically, more detailed information but cannot obtain, the kind, quantity, purposes etc. of article entrained by some parameters of environment and target residing for target.Therefore utilize sonar to obtain submarine target information and there is significant limitation.So for submarine target, this is simple, its a large amount of, detailed information of quick obtaining how, just becomes a problem in the urgent need to address.
Current, RFID technique is quite ripe on land, application also widely, its feature is exactly frequency read/write carrys out Obtaining Accurate radio-frequency (RF) tag details by receiving and send radiofrequency signal, and fresh information can be write label, upgrade label substance at any time, the method is simple, quick and cost is low.But because underwater environment is complicated, noise is many, and decay is fast, directly RFID technique is used do not have what practical significance under water.Therefore the present invention is directed to the advantage that the problems referred to above combine ripe RFID technique and underwater sound wave transmission, have devised a kind of system for reading and writing underwater sound label newly.
Summary of the invention
Object of the present invention, be to provide a kind of for acoustics tag read system under water, it can obtain some details of target simply, fast, in large quantities.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of for acoustics tag read system under water, comprise and controlling and processing unit, transceiver module, power management module, interface circuit, mixed-media network modules mixed-media and display module, wherein, control to be connected with processing unit and transceiver module, control transceiver module and send signal, and the direct wave received transceiver module and target echo carry out data processing; Described transceiver module is used for sending and Received signal strength; Described interface circuit is connected with processing unit with control, sets up the connection controlled with processing unit and outer welding system; Described mixed-media network modules mixed-media is connected with processing unit with control by interface circuit, sets up control and processing unit and the remote computer connection by network; Described display module is connected with processing unit with control by interface circuit, and is controlling to show data under the control with processing unit; Described power management module is controlling to power for each parts under the control with processing unit.
Above-mentioned control and processing unit comprise microprocessor, protocol processing unit, signal processing unit and memory module, and wherein, microprocessor is connected with power management module and controls its work, and described microprocessor also controls the work of outer welding system by interface circuit;
Described signal processing unit connects transceiver module and protocol processing unit respectively, and send into protocol processing unit after carrying out demodulation to the signal of transceiver module transmission, the signal simultaneously sent protocol processing unit sends into transceiver module after modulating;
Described protocol processing unit connects microprocessor and signal processing unit respectively, and send into microprocessor after decoding to the signal of signal processing unit transmission, the signal simultaneously sent microprocessor sends into signal processing module after encoding;
Described memory module is connected with microprocessor, and stores information and data under control of the microprocessor.
Above-mentioned transceiver module comprises the processing module that transmits, Received signal strength processing module and transducer module, wherein, transducer module comprises the transceiver insulation device connected successively and puts transducer altogether with transmitting-receiving, the processing module that transmits comprises the first bandwidth-limited circuit and power amplification circuit that connect successively, and the output terminal of described power amplification circuit connects transceiver insulation device; Received signal strength processing module comprises the low noise amplifier circuit and the second bandwidth-limited circuit that connect successively, and the output terminal of described low noise amplifier circuit connects transceiver insulation device.
After adopting such scheme, the present invention has following innovative point:
(1) the present invention proposes a kind of method for designing for acoustics read-write system under water, water-tight shell, streamline external form, is convenient to be applied on water surface ship hull bottom or submarine navigation device;
(2) compared with traditional rfid interrogator, Bound moisture acoustic transducer of the present invention, using sound wave as carrier, transmits data by acoustical signal, realizes the communication with underwater sound label, thus carries out exchanges data;
(3) acoustics read-write system of the present invention additionally provides network function, can realize, with the communication of remote computer, realizing data resource sharing;
(4) present invention employs CDMA slotted ALOHA collision-proof method, multiple underwater sound label can be identified simultaneously.
Accompanying drawing explanation
Fig. 1 is application schematic diagram of the present invention;
Fig. 2 is appearance schematic diagram of the present invention;
Fig. 3 is entire block diagram of the present invention;
Fig. 4 controls the structured flowchart with processing unit in the present invention;
Fig. 5 is the structured flowchart of transceiver module in the present invention;
Fig. 6 is workflow schematic diagram of the present invention;
Fig. 7 is firing order frame assumption diagram in the present invention;
Fig. 8 is acoustics label anti-collision schematic diagram in the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
The invention provides a kind of for acoustics tag read system under water, it can be used on water surface ship or submarine navigation device, in order to read while write one or more acoustics label under water, thus obtain the details of submarine target in a large number, rapidly, as shown in Figure 1, its profile can coordinate shown in Fig. 2 use schematic diagram of the present invention.
The present invention is a kind of for acoustics tag read system under water, comprise and controlling and processing unit, interface circuit, mixed-media network modules mixed-media, display module, transceiver module and power management module, wherein, control to send signal with processing unit for controlling transceiver module, and the direct wave received transceiver module and target echo carry out data processing; Transceiver module is used for sending and Received signal strength; Interface circuit controls external system module; Mixed-media network modules mixed-media realizes data network and shares; Display module realizes the visual of data; Whether power management module for managing the work of aforementioned associated components, and its overall architecture as shown in Figure 3, is put up with each building block below and introduced respectively.
In the present embodiment, described interface circuit is mainly used in data transmission and communicates mutually, have the TTL interface circuit of connection display device, with main-machine communication and the RS232 serial port circuit be connected with mixed-media network modules mixed-media, jtag interface circuit for debugging.
Described mixed-media network modules mixed-media is connected with interface circuit, complete the networking of read-write system, be convenient to remote computer by network checking and extracting read-write system data, or read-write system regularly sends to remote computer data by network, is conducive to resource sharing.Because the present invention is mainly used on ship or submarine navigation device, be applicable to adopting wireless network connecting mode, so select GPRS wireless network module.
Described display module selects LCD display, is connected with main frame by interface circuit, data can be shown to client intuitively, and it is visual that realization reads and writes data.
In the present embodiment, described control and processing unit comprise memory module, microprocessor, protocol processing unit and signal processing unit, as shown in Figure 4.Wherein, the major function of microprocessor is as follows: realize anticollision protocol (will describe in detail later), carry out serial communication by interface circuit and main frame, controls power management module, ensure the steady operation of each parts or quit work, being controlled the work of outer welding system by interface circuit.
Described memory module is connected with microprocessor, for storing some data etc. of information and program operation.
Described protocol processing unit connects microprocessor and signal processing unit respectively, the encoding and decoding of main complete pair signals, coding adopts Manchester (Manchester) coded system, decoding adopts Manchester (Manchester) decoding, also other coded system can be adopted according to concrete communicating requirement (as communication distance and message transmission rate), as reverse non-return-to-zero (NRZ) coding, Miller (Miller) coding etc. during practical application.
The modulation and demodulation of the main complete pair signals of described signal processing unit, modulation system adopts frequency shift keying (FSK), and wherein " 0 " uses carrier frequency f
0=10KHz modulates, and " 1 " uses carrier frequency f
1=11KHz modulates, this modulation technique strong anti-interference performance, is applicable to underwater communication; Demodulation adopts coherent demodulation mode, also can adopt other modulation technique during practical application according to concrete communicating requirement (as communication distance and message transmission rate), as Quadrature Phase Shift Keying (QPSK) modulation, quadrature amplitude modulation (QAM) modulation etc.
The communication distance of aforementioned indication and message transmission rate, owing to considering the features such as underwater environment is complicated and changeable, serious interference, limited bandwidth, carrier frequency are low, the communication distance of the present invention and acoustics label is tens to a few km, communications band is 5 ~ 20KHz, and data average transmission rate is 4kbit/s.
In the present embodiment, described transceiver module comprises the processing module that transmits, Received signal strength processing module and transducer module, as shown in Figure 5, wherein, the processing module that transmits comprises power amplification circuit and the first bandwidth-limited circuit, be mainly used in filtering noise and power amplification, so that transducer module is launched; Described Received signal strength processing module comprises low noise amplifier circuit and the second bandwidth-limited circuit, is mainly used in restraint speckle and amplifying signal, so that control with processing unit the further process of signal; Described transducer module comprises transceiver insulation device and transmitting-receiving puts transducer altogether, and wherein, transceiver insulation device is for distinguishing the signal that will launch and the signal after receiving and dispatching and putting transducer conversion altogether; Transmitting-receiving is put transducer altogether and is launched for armed electric signal is converted to acoustical signal, and for the acoustical signal received is converted to electric signal, realizes the launching and receiving of underwater sound signal, and realizes the conversion between underwater sound signal and electric signal.
Described power management module is used for providing stable working power for each parts, realizes the whether control of each component working.
Be described above hardware construction of the present invention, operationally, read-write system of the present invention by transmit to acoustics label with realize from acoustics label Received signal strength and the communicating of acoustics label, complete exchanges data, thus read or upgrade the information entrained by acoustics label.As shown in Figure 6, step is as follows for workflow:
Step S6-1: system electrification, system initialization serial ports, program variable etc.;
Step S6-2: wait for that main frame is given an order, start working if any order, does not order and continues to wait for;
Step S6-3: after read-write system receives Host Command, forms corresponding command frame;
Step S6-4: read-write system enters anticollision counting program after sending inquiry instruction;
Step S6-5: acoustics label sends response instruction after receiving instruction, read-write system receives the response instruction of acoustics label again, thus establishes the communication of read-write system and acoustics label, achieves the exchange of data;
In above-mentioned steps S6-3, as shown in Figure 7, and each region adopts low order in the posterior form of front, high significance bit to described firing order frame structure; Described frame head is start of frame delimiter, indicates the beginning of a frame, makes read-write system achieve frame synchronous, adopts 7 bit positions 111101; Describedly be masked as form for showing from instruction to acoustics label, type and the requirement to link order, one has 5 bit positions, as shown in table 1, table 2, table 3.
Table 1
Table 2
Table 3
In above-mentioned Fig. 7, described order, for selecting the type sending instruction, is made up of 4 bit positions, is divided into two large classes:
Mandatory order: read-write system all will perform and the label order that all will respond.
Optional command: the more optional read-write of read-write system waits order.
Specifically as shown in table 4.
Table 4
In the figure 7, described parameter and data are according to the difference of command forms, and parameter and the concrete of data are also not quite similar, and also will use some data messages of label simultaneously, as shown in table 5 several.
Table 5
Concrete read-write system is that parameter and data have following several situation:
When order is for checking order, parameter is AFI, and now zone bit determines whether AFI's is effective.
When order is for making to cease and desist order, parameter is for making the SUID of stopping label.
When order is for reading single or multiple memory block, No. SUID of the label that parameter will be read for you, memory block numbers and number.
When order is for writing single or multiple memory block, No. SUID of the label that parameter will be write for you, memory block numbers and number and the data content that will write.
When order is for locking memory block, No. SUID, memory block numbering of the label that parameter will lock for you.
When order is for read apparatus data, No. SUID of the label that parameter will be read for you, data class that you will read, as AFI, DSFID etc.
When order is for writing system data, No. SUID of the label that parameter will be write for you, data class that you will write and the data that correspondence will be write, as AFI, DSFID etc.
When order is for making to choose and make preparation, No. SUID of the label that parameter will be write for you for parameter.
When order is for locking system data, No. SUID of the label that parameter will lock for you, data class that you will lock, as AFI, DSFID etc.
In above-mentioned Fig. 7, described CRC is error detection mechanism, checks the error of transmission of data, adopts the heavy remaining detection of the circulation of 16.
In above-mentioned Fig. 7, described postamble, as the mark of end one frame, adopts 6 bit positions 101111.
In above-mentioned steps S5-4, the inquiry instruction (checking instruction) that read-write system sends, have multiple acoustics label to reply simultaneously, at this moment conflict will be produced, this patent adopts CDMA slotted ALOHA algorithm, channel is divided into multiple time slot (Slot) by this algorithm, and label only transmits data in the synchronization slot of regulation.Concretism is: first specify that each acoustics label has oneself a No. UID, read-write system sends inquiry instruction (checking instruction), the label that no conflict occurred in each synchronous time slot will send to read-write system oneself No. UID, after the time slot of some, read-write system obtains No. UID of part acoustics label, and then read-write system repeats aforesaid operations.Such No. UID of just can obtain all acoustics labels through same operation for several times.So just determine the number of read-write system interior label, simultaneously after the UID obtaining acoustics label, just can carry out exchanges data with this acoustics label, realize read-write operation.The present invention adopts 16 timeslot numbers to carry out data transmission.Concrete methods of realizing as shown in Figure 8.
Step 8.1: first read-write system sends inquiry instruction take EOF as frame end mark, and number of time slots is 16, and slot length is 4;
Step 8.2: acoustics label 1 responds in time slot 0.At this moment in gap, only have label 1 to respond, do not collide, the UID of label 1 is correctly received and record by read-write system;
Step 8.3: read-write system sends EOF, forwards next time slot 1 to;
Step 8.4: in time slot 1, acoustics label 2 and acoustics label 3 respond simultaneously, collide, and read-write system cannot obtain acoustics label UID, now detects this collision and record;
Step 8.5: read-write system sends an EOF, jumps to next time slot 2;
Step 8.6: at time slot 2, do not have acoustics label to respond, read-write system can't detect the SOF of acoustics label, so read-write system sends EOF, jumps to next time slot 3;
Step 8.7: at time slot 3, label 4 and label 5 respond simultaneously, collide equally;
Step 8.8: read-write system determines to operate the acoustics label 1 detected, sends a UID with acoustics label 1 and asks;
Step 8.9: all acoustics labels all detect SOF, exits anticollision sequence then this instruction of process.Because request, with No. UID of acoustics label 1, only has acoustics label 1 to make response for this reason.Read-write system can interrupt anticollision sequence by program, sends request again and operate acoustics label 1 after also can waiting until time slot 15.
Step 8.10: all acoustics labels prepare to receive new request, if inquiry request, timeslot number will restart from 0, repeat said process.
As shown in Figure 8:
Stand-by period before t1-for acoustics label, the EOF namely receiving read-write system from acoustics label can send to acoustics label.
T2-for read-write system, namely receive acoustics label to the EOF of the response sequence of last request or after read-write system sends static request sequence EOF from read-write system, the stand-by period before next request can be sent to read-write system.Ready for guaranteeing acoustics label, to receive subsequent request.
T3 a pair read-write system, in demand operating, when read-write system does not receive acoustics tag responses, after the last EOF of read-write system, can send the stand-by period of next EOF to read-write system.
The regulation of the present invention to above-mentioned time value is as shown in table 6, and wherein tsof refers to the time that acoustics label transmission SOF continues to read-write system.
Table 6
| Time | Minimum value | General value | Maximal value |
| t1 | 94/fc(5.2ms) | 96/fc(5.3ms) | 98/fc(5.4ms) |
| t2 | 30/fc(1.7ms) | 32/fc(1.8ms) | 34/fc(1.9ms) |
| t3 | T1 maximal value+tsof | - | - |
Fc is underwater sound communication carrier frequency, and the present embodiment is 18KHz.
In above-mentioned steps S5-5, after read-write system determines No. UID of an acoustics label, just can set up the communication between read-write system and acoustics label, thus realize exchanges data.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (2)
1. one kind for acoustics tag read system under water, it is characterized in that: comprise and controlling and processing unit, transceiver module, power management module, interface circuit, mixed-media network modules mixed-media and display module, wherein, control to be connected with processing unit and transceiver module, control transceiver module and send signal, and the direct wave received transceiver module and target echo carry out data processing; Described transceiver module is used for sending and Received signal strength; Described interface circuit is connected with processing unit with control, sets up the connection controlled with processing unit and outer welding system; Described mixed-media network modules mixed-media is connected with processing unit with control by interface circuit, sets up control and processing unit and the remote computer connection by network; Described display module is connected with processing unit with control by interface circuit, and is controlling to show data under the control with processing unit; Described power management module is controlling to power for each parts under the control with processing unit;
Described control and processing unit comprise microprocessor, protocol processing unit, signal processing unit and memory module, and wherein, microprocessor is connected with power management module and controls its work, and described microprocessor also controls the work of outer welding system by interface circuit;
Described signal processing unit connects transceiver module and protocol processing unit respectively, and send into protocol processing unit after carrying out demodulation to the signal of transceiver module transmission, the signal simultaneously sent protocol processing unit sends into transceiver module after modulating; The communications band of described signal processing unit is 5-20KHz, and data average transmission rate is 4Kbit/s;
Described protocol processing unit connects microprocessor and signal processing unit respectively, and send into microprocessor after decoding to the signal of signal processing unit transmission, the signal simultaneously sent microprocessor sends into signal processing module after encoding;
Described memory module is connected with microprocessor, and stores information and data under control of the microprocessor;
Described read-write system also comprises following firing order frame: the structure of described firing order frame is " frame head-mark-order-parameter-data-CRC-postamble ", and described frame head is start of frame delimiter, indicates the beginning of a frame, makes read-write system achieve frame synchronous; Describedly be masked as form for showing from instruction to acoustics label, type and the requirement to link order; Described order is for selecting the type sending instruction; Described CRC is error detection mechanism, detects the error of transmission of data, adopts the cyclic redundancy check of 16; Described postamble is as the mark of end one frame;
Described read-write system adopts following agreement:
Step 8.1: first read-write system sends inquiry instruction take EOF as frame end mark, and number of time slots is 16, and slot length is 4;
Step 8.2: acoustics label 1 responds in time slot 0; At this moment in gap, only have acoustics label 1 to respond, do not collide, the UID of acoustics label 1 is correctly received and record by read-write system;
Step 8.3: read-write system sends EOF, forwards next time slot 1 to;
Step 8.4: in time slot 1, acoustics label 2 and acoustics label 3 respond simultaneously, collide, and read-write system cannot obtain acoustics label UID, now detects this collision and record;
Step 8.5: read-write system sends an EOF, jumps to next time slot 2;
Step 8.6: at time slot 2, do not have acoustics label to respond, read-write system can't detect the SOF of acoustics label, so read-write system sends EOF, jumps to next time slot 3;
Step 8.7: at time slot 3, label 4 and label 5 respond simultaneously, collide equally;
Step 8.8: read-write system determines to operate the acoustics label 1 detected, sends a UID with acoustics label 1 and asks;
Step 8.9: all acoustics labels all detect SOF, exits anticollision sequence then this instruction of process;
Step 8.10: all acoustics labels prepare to receive new request, if inquiry request, timeslot number will restart from 0, repeat said process.
2. a kind of for acoustics tag read system under water as claimed in claim 1, it is characterized in that: described transceiver module comprises the processing module that transmits, Received signal strength processing module and transducer module, wherein, transducer module comprises the transceiver insulation device connected successively and puts transducer altogether with transmitting-receiving, the processing module that transmits comprises the first bandwidth-limited circuit and power amplification circuit that connect successively, and the output terminal of described power amplification circuit connects transceiver insulation device; Received signal strength processing module comprises the low noise amplifier circuit and the second bandwidth-limited circuit that connect successively, and the output terminal of described low noise amplifier circuit connects transceiver insulation device.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779482A (en) * | 2004-11-26 | 2006-05-31 | 中国船舶重工集团公司第七一五研究所 | Transmitting method and transmitter for underwater super-wideband combined audio array |
| CN101140612A (en) * | 2006-09-05 | 2008-03-12 | 刘礼白 | Sound wave recognition ( SWID ) technology |
| CN101867420A (en) * | 2010-06-18 | 2010-10-20 | 华南理工大学 | Underwater multi-path communication method based on frequency spectrum perception and prediction |
| CN102280013A (en) * | 2011-07-11 | 2011-12-14 | 江苏科技大学 | WSN-based marine environment remote monitoring and early warning system and method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779482A (en) * | 2004-11-26 | 2006-05-31 | 中国船舶重工集团公司第七一五研究所 | Transmitting method and transmitter for underwater super-wideband combined audio array |
| CN101140612A (en) * | 2006-09-05 | 2008-03-12 | 刘礼白 | Sound wave recognition ( SWID ) technology |
| CN101867420A (en) * | 2010-06-18 | 2010-10-20 | 华南理工大学 | Underwater multi-path communication method based on frequency spectrum perception and prediction |
| CN102280013A (en) * | 2011-07-11 | 2011-12-14 | 江苏科技大学 | WSN-based marine environment remote monitoring and early warning system and method |
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