CN107819713B - Multichannel parallel processing frequency domain modulation and demodulation method based on inductive coupling temperature and salt deep chain - Google Patents
Multichannel parallel processing frequency domain modulation and demodulation method based on inductive coupling temperature and salt deep chain Download PDFInfo
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Abstract
The invention relates to a multichannel parallel processing frequency domain demodulation method based on an inductive coupling temperature-salt deep chain, and a demodulation method designed by combining a multicarrier baseband and FSK mixed modulation method based on the inductive coupling temperature-salt deep chain, so that a set of complete marine communication transceiving system is designed, and the accuracy of multicarrier baseband and FSK aliasing transmission is improved. Firstly, simulation test is carried out on MATLAB software, and the feasibility of the demodulation method is verified. In addition, the LABVIEW software and the actual coupling channel are used for carrying out actual laboratory-level test on the whole marine communication transceiving system so as to verify the use condition in the actual environment, and the superiority is verified by comparing with the traditional time domain filtering method. The invention provides a new method for marine data transmission research, has important practical significance for improving the transmission rate and accuracy of the marine communication system, and provides a solution for a complex marine communication monitoring system.
Description
Technical Field
The invention provides a multichannel parallel processing frequency domain modulation and demodulation method based on an inductive coupling temperature-salt deep chain based on a multi-carrier baseband and FSK mixed modulation method of the inductive coupling temperature-salt deep chain, so as to improve the accuracy of multi-carrier baseband and FSK aliasing transmission, provide a new idea for data communication research based on an inductive coupling communication channel, and provide a method basis for improving the anti-interference capability of a marine communication system and reducing the error rate of signal transmission.
Background
The data transmission technology based on the inductive coupling channel is one of key technologies of ocean measurement, adopts the electromagnetic induction principle to realize non-contact underwater signal transmission, has the characteristics of simple structure, low cost and long transmission distance of a transmission mode, and can perform three-dimensional networking on sensor nodes to realize better ocean monitoring effect. The inductive coupling ocean data communication system mainly comprises an underwater data node, a data transmission channel and an above-water receiving modulation system, wherein the underwater data node comprises a sensor and a data transmitting modulation system; the transmission channel consists of a coupling magnetic ring (comprising an above-water magnetic ring and an under-water magnetic ring), a transmission cable and a water body. In the actual measurement work of the induction coupling ocean, a sensor in an underwater data node acquires information such as seawater temperature, salinity, depth and the like of different nodes, the data is modulated and packaged by a data sending modulation system and transmitted to an underwater magnetic ring, then the data is transmitted to a single-turn coil through induction coupling and then transmitted to an overwater magnetic ring, and finally the data is transmitted to an overwater receiving modulation system for demodulation processing.
At present, the inductive coupling transmission system developed in china uses the marine environment, a ferrite magnetic ring and a high-strength plastic-coated steel cable as transmission channels, and applies ASK or DPSK modulation and demodulation technology to realize data information transmission, and the transmission rate reaches 1200 bps. Compared with china, other countries have various mature products based on the inductive coupling principle. At present, two companies are mainly used for mastering the inductive coupling transmission technology and actually applying the inductive coupling transmission technology to the ocean monitoring system, namely SBE-BIRD in the united states and RBR in canada, and the transmission rate of the product can reach 9.6 Kbps. The demodulation methods commonly used in ASK are non-coherent demodulation (envelope detection method) and coherent demodulation (synchronous detection method); the demodulation methods commonly used in DPSK are coherent demodulation (polarity comparison method) and code inverse transformation method and differential coherent demodulation (phase comparison method), and a serial data processing mode is adopted, so that the processing speed is low and the demodulation circuit is complex. The time domain demodulation method based on the inductive coupling temperature-salt deep-chain multi-carrier baseband and FSK mixed modulation has the advantages of low anti-interference capability, poor adaptability to low signal-to-noise ratio channels in a complex marine environment and low data transmission accuracy, and compared with the data demodulation method in the time domain, the method for analyzing frequency domain data by adopting a parallel filter has the advantages of simple circuit design and high signal transmission accuracy.
Disclosure of Invention
The invention aims to design a frequency domain demodulation method based on multi-channel parallel processing by researching a demodulation method of an inductively coupled temperature-salt deep-chain communication system receiver, improve the accuracy of multi-carrier baseband and FSK aliasing modulation transmission, reduce the error rate of transmission signals, greatly improve the working capacity and real-time monitoring capacity of a marine monitoring network, reduce the power consumption of a marine communication monitoring node and prolong the service life.
The invention carries out theoretical analysis according to the channel characteristics and Fourier change of an inductive coupling channel, designs a novel signal demodulation method based on the multi-carrier baseband and FSK mixed modulation method of an inductive coupling temperature-salt deep chain according to the related theoretical knowledge of FFT/IFFT and the advantages of frequency domain filtering, and improves the accuracy of multi-carrier baseband and FSK aliasing transmission. Firstly, converting a received time domain digital signal into a frequency domain signal through FFT (fast Fourier transform), and obtaining a frequency spectrum of the signal; secondly, the frequency domain signals obtained by transformation simultaneously pass through a plurality of frequency domain filters in parallel to carry out frequency domain filtering, and a baseband frequency spectrum is extracted, wherein the number of the filters in the frequency domain signals depends on the number of the sending parameters, and the filters are window functions on the frequency domain; and finally, IFFT is carried out on all the extracted signals, the frequency domain is converted into the time domain, the square wave form is recovered by shaping, and then counting is carried out. The invention is based on an inductive coupling temperature-salt deep chain, has three signals of temperature, salinity and depth, the modulation part is provided with three square waves with different frequencies, the square wave of each frequency represents a parameter, the periodicity of the square wave is the sending value of the parameter, therefore, the invention designs four frequency domain filters with different central frequencies and four channels of parallel processing.
The invention relates to a multichannel parallel processing frequency domain demodulation method based on an inductive coupling temperature-salt deep chain, and a demodulation method designed by combining a multicarrier baseband and FSK mixed modulation method based on the inductive coupling temperature-salt deep chain, so that a set of complete marine communication transceiving system is designed, and the accuracy of multicarrier baseband and FSK aliasing transmission is improved. Firstly, simulation test is carried out on MATLAB software, and the feasibility of the demodulation method is verified. In addition, the actual laboratory-level test is carried out on the whole marine communication transceiving system by utilizing LABVIEW software and an actual coupling channel so as to verify the use condition in the actual environment. The invention provides a new method for marine data transmission research, has important practical significance for improving the transmission rate and accuracy of the marine communication system, and provides a solution for a complex marine communication monitoring system.
The technical scheme of the invention is as follows:
the invention discloses a multi-channel parallel processing frequency domain demodulation method based on an inductive coupling temperature-salt deep chain based on the characteristics of the inductive coupling temperature-salt deep chain and combined with a multi-carrier baseband and FSK mixed modulation method of the inductive coupling temperature-salt deep chain, so that a complete transceiving marine communication system is formed, the feasibility and the superiority of the demodulation method are verified by using MATLAB, and practical tests are carried out by using LABVIEW software, an actual marine coupling channel and an MATLAB demodulation program algorithm. The method can be expressed as that a data modulation algorithm program is programmed and designed by LABVIEW software to modulate and send data, and a NI USB-6259 data acquisition card is used for collecting and receiving modulated data passing through an ocean coupling channel, further storing the received data, and demodulating the data by a multi-channel parallel processing frequency domain demodulation program, so that the feasibility of the demodulation method in the actual situation is verified, and compared with the traditional time domain filtering method, the superiority of the demodulation method is verified.
The invention provides a multichannel parallel processing frequency domain modulation and demodulation method based on an inductive coupling temperature-salt deep chain, which comprises the following specific steps:
Firstly, designing a multi-carrier baseband and FSK mixed modulation method based on the channel characteristics of an inductive coupling temperature-salt deep-chain marine communication system, and carrying out baseband square wave modulation without adding a carrier; the square wave frequency part adopts a frequency change mode of FSK, and the signal only transmits four parameters of temperature, salinity and depth, so that four different frequency signals are serially transmitted to a channel, the first frequency section is a guided wave, the periodicity is fixed, and the guided wave plays a role in guiding and identifying; the last three frequencies are parameters of temperature, salinity and depth in the ocean respectively, and the value of the period number represents the parameter value; the four frequencies are transmitted together for a group of data.
Converting a time domain signal of a modulated channel into a frequency domain signal through FFT in parallel, extracting a baseband frequency spectrum signal of each frequency through four time domain window filters with different central frequencies in parallel, converting the extracted frequency spectrum signal into a time domain signal through IFFT, shaping to form a square wave, counting by utilizing a rising edge, and storing; if the frequency of the received signal is equal to the guided wave frequency of the transmitted signal, then storing the later received data; if not, discarding the following data;
The method comprises the steps of integrating a data sending system and a data receiving system to form a complete communication transceiving system, utilizing MATLAB to perform test simulation, adding Gaussian white noise to the MATLAB, inputting 3 types of temperature, salt and depth data quantities, modulating corresponding frequency and periodicity through a modulation system, setting the signal-to-noise ratio of the system, setting the length of each reading of FFT and IFFT in the demodulation system, setting the central frequency of a frequency domain filter to correspond to four types of frequencies of sent square waves, performing shaping counting to obtain corresponding data, calculating the obtained data and the sent data to obtain a corresponding error rate, and comparing the error rate with the error rate of traditional time domain filtering. The test result shows that the frequency domain demodulation method based on the multi-carrier baseband and FSK mixed modulation mode has feasibility, has higher data transmission accuracy compared with the traditional time domain demodulation method, can realize the functions of a marine communication system, can ensure a very low error rate under the condition of lower signal-to-noise ratio, and is very suitable for being used in complicated oceans.
Step 4, adding an actual inductive coupling channel to carry out verification experiment
A transmission modulation system is designed by utilizing LABVIEW software, namely, the numerical values of three parameters of temperature, salinity and depth are input, square wave signals formed by combining four different frequencies of guided wave, temperature, salinity and depth are modulated, white Gaussian noise is added to simulate an actual environment, signals of mixed noise are transmitted to an actual marine communication inductive coupling channel, signals passing through the channel are collected by utilizing an NI USB-6259 data acquisition card, received digital signals are demodulated by using the receiving and demodulating method described in the second step, specific numerical values of the three parameters are obtained, the obtained data and the transmitted data are compared to obtain an error rate, and the error rate is compared with the error rate generated by the traditional time domain demodulating method. According to experimental results, the frequency domain demodulation method based on the multi-carrier baseband and FSK mixed modulation mode can be used in an actual marine coupling channel, has higher accuracy and higher use value compared with the traditional time domain demodulation method, and the result is consistent with a simulation test result of a system, thereby proving the accuracy of the simulation test.
The invention has the advantages and beneficial effects that:
the invention aims at improving accuracy of multi-carrier baseband and FSK aliasing transmission, and provides a multichannel parallel processing frequency domain demodulation method based on an inductive coupling temperature-salt deep chain, compared with other commonly used demodulation methods such as ASK, DPSK and the like, the method demodulates the transmitted data by using the multichannel parallel processing frequency domain demodulation method, and adopts parallel multichannel data processing, thereby reducing data processing time, improving data processing capacity and simplifying demodulation circuits; compared with the traditional parallel time domain demodulation method, the design difficulty of the filter is simplified, the applicability of the method is improved, in addition, the filtering capability of the demodulation system is improved, the interference which is difficult or impossible to remove in the time domain can be simply removed in the frequency domain, the anti-interference capability and the data transmission accuracy of the system are improved, and the actual requirements of the marine communication system are met. The ocean communication system constructed by combining multi-carrier baseband and FSK mixed modulation based on the inductive coupling temperature-salt deep chain with multi-channel parallel processing frequency domain demodulation has the advantages of low power consumption, large transmission data volume and long service life, and the parallel processing demodulation mode reduces the data processing time. The data transmission quantity can be greatly increased, the monitoring system is expanded according to the requirement, the number of parameter values is increased by the modulation part, and the complexity of the whole communication system can be conveniently improved by only increasing the corresponding processing part by the demodulation part. The method is very suitable for the parallel advantage of the common FPGA, so that the data processing speed can be greatly increased, the processing capacity of the whole communication system is improved, the power consumption of the whole system is reduced, and the service cycle of the whole communication system is prolonged.
Fig. 1 is a general design diagram of marine communication based on multi-carrier baseband and FSK hybrid modulation of an inductive coupling temperature-salt deep chain, mainly comprising: (a) the device comprises an overwater magnetic ring part, (b) a transmission steel cable, (c) an underwater magnetic ring, (d) a modulation part and (e) a demodulation part;
FIG. 2 is a flow chart of algorithm implementation, where (a) is the modulation part and (b) is the demodulation part and its structure;
fig. 3 is a waveform restoration of each node of the marine communication system, wherein (a) is a transmitted original square wave, (b) a noise-added square wave, (c) a frequency spectrum graph after FFT, (d) a frequency spectrum after filtering, (e) a waveform after IFFT, and (f) a shaped waveform;
fig. 4 is a graph of bit error rate calculation, where (a) is a graph of bit error rate versus time domain and frequency domain demodulation, and (b) is a graph of bit error rate versus transmission frequency versus time domain and frequency domain demodulation;
the following further describes embodiments of the present invention by way of example with reference to the accompanying drawings.
Detailed Description
Example one
The first step is as follows: designing a transmit modulation section
Firstly, selecting a lead code as a square wave of 30KHz, and setting the periodicity as 5000; the temperature information adopts 60KHZ square waves, and the periodicity is set to be 8000; salinity information adopts 70KHz square waves, and the periodicity is set to 2000; the depth information is a 40KHz square wave with a cycle number set to 3000. According to the serial mode, firstly sending a lead code, secondly sending temperature information, thirdly sending salinity information and finally sending out the four square wave group signals with fixed frequency and determined periodicity.
The second step is that: designing a receive demodulation system
The system consists of a system, four band-pass filters, a shaper and a counter. The FFT adopts 2048FFT points, when the bit stream comes, 2048 points are automatically collected and input into an FFT system for fast Fourier transform, so that a new group of data is converted. The filter has 100 orders and is used for filtering out signals of 30KHz, 60KHz, 70KHz and 40KHz respectively. The signal is then IFFT-processed and converted again to a time-domain bit stream. The converted signal is sinusoidal and is shaped into a square wave using a shaper. The principle of the shaper is that if the voltage value of the input signal is larger than a certain threshold, the output signal is high, and if equal to or lower than the threshold, the output signal is low. In principle, the threshold is a voltage value greater than zero, so that the final output square wave duty cycle is less than 50%. And finally, counting the number of rising edges by adopting a counter, so that the purpose of counting the number of technical square waves can be achieved, and the information contained in the signal can be acquired.
The third step: communications modem system plus noise test
Designing a transmission modulation part as described in the first step, wherein the guided wave frequency is 30KHz, and the period is 5000; the temperature frequency is 60KHz, and the cycle number is 8000; salinity frequency is 70KHz, and periodicity is 2000; the depth frequency is 40KHz, and the periodicity is 3000; the modulated signal is output serially, white Gaussian noise is added, the signal to noise ratio is set to be 8db, an output signal interfered by noise is formed, the signal is input into the receiving and demodulating system in the second step, corresponding parameter values are demodulated, the demodulated values are compared with the sent values, corresponding error codes are calculated, and the error codes are compared with the error codes generated by a traditional time domain demodulating system. Through simulation test, the feasibility of the novel frequency domain demodulation method is verified, and the accuracy of multi-carrier baseband and FSK aliasing transmission is improved.
The fourth step: verification experiment by adding actual inductive coupling channel
Designing a sending part by utilizing LABVIEW software, inputting temperature, salinity and depth parameter values, and further modulating a square wave of guided wave 30KHz, wherein the periodicity is set to be 5000; the temperature parameter adopts square waves with the frequency of 60KHz, and the periodicity is set to 8000; the salinity parameter adopts a square wave with the frequency of 70KHz, and the periodicity is set to 2000; the depth parameter was a square wave with a frequency of 40KHz and the number of cycles was set to 3000. The square waves with four frequencies are converted into analog electric signals by an analog-to-digital converter, the analog electric signals are input into an inductive coupling channel, and the signals passing through the channel are collected by an NI USB-6259 data collection card. And demodulating the received digital signal by using the receiving system program described in the third step to obtain specific numerical values of the three parameters, and comparing the obtained numerical values with the sending numerical values to calculate the error rate. The test verifies that the novel frequency domain filtering demodulation method improves the accuracy of multi-carrier baseband and FSK aliasing transmission, and compared with a simulation test, the result is consistent with a simulation test result of a system, and the accuracy of the simulation test is proved.
Simulation and analysis results
(1) As can be seen from fig. 3, the novel frequency domain demodulation method designed for improving the accuracy of multi-carrier baseband and FSK aliasing transmission adopts a parallel processing mode, and after the signals are transformed into frequency domain signals through FFT, the baseband frequency spectrum is extracted through a plurality of frequency domain filters at the same time, and then the signals are transformed into time domain signals through IFFT, and the signals are shaped and counted. The structure mode can reduce the signal processing time and improve the data processing capacity; meanwhile, the demodulation mode is well suitable for a multicarrier baseband and FSK mixed modulation method based on the inductive coupling temperature-salt deep chain, and can jointly construct a whole set of marine communication system.
(2) As can be seen from fig. 4, the bit error rate of the signal tends to increase gradually with the decrease of the signal-to-noise ratio, and when the noise of the signal is too large, the useful signal is submerged, causing signal interference and the useful signal cannot be extracted, and in order to make the bit error rate within the range of two thousandths, the signal-to-noise ratio is theoretically the lowest 4db, and the signal-to-noise ratio in the actual test rises to 8 db; compared with the traditional time domain demodulation method, the bit error rate is greatly reduced under the condition of the same signal-to-noise ratio, the lowest signal-to-noise ratio is greatly reduced compared with the traditional method, and the method can be used in a worse environment. The method has stronger anti-interference capability and can improve the accuracy of multi-carrier baseband and FSK aliasing transmission.
The following conclusions can also be drawn from this experiment: the novel frequency domain demodulation method and the multi-carrier baseband and FSK mixed modulation method can be constructed into a set of complete marine communication system. On one hand, the circuit can be simplified, the power consumption can be reduced, the transmission system packs temperature, salt and deep multiple data parameters at one time, the transmission information amount is large, the transmitted parameters can be increased according to the actual use condition, the transmission parameter amount is increased, the monitoring range is expanded, and the service life of the whole system can be prolonged; on the other hand, the anti-interference capability of the system can be improved, the error rate is reduced, the accuracy of data transmission is improved, and a feasible scheme is provided for constructing a complex ocean monitoring system.
Claims (4)
1. A multichannel parallel processing frequency domain modulation and demodulation method based on an inductive coupling temperature-salt deep chain is characterized in that:
step 1, designing a transmission modulation part
Firstly, designing a multi-carrier baseband and FSK mixed modulation method based on the channel characteristics of an inductive coupling temperature-salt deep-chain marine communication system, and carrying out baseband square wave modulation without adding a carrier; the square wave frequency part adopts a frequency change mode of FSK, and signals for carrying out baseband modulation need to transmit three parameters of temperature, salinity and depth besides guided waves, so that four different frequency signals are serially transmitted into a channel, the first frequency section is guided waves, the periodicity is fixed, and the guided waves play a role in guiding and identifying; the last three frequencies are parameters of temperature, salinity and depth in the ocean respectively, and the value of the period number represents the parameter value; the four frequencies are transmitted together as a group of data;
step 2, designing a receiving demodulation system
The demodulation system is composed of four band-pass filters, a shaper and a counter, wherein a modulated channel is parallelly converted into a frequency domain signal through FFT, the frequency domain signal is respectively parallelly passed through four time domain window filters with different central frequencies, a baseband frequency spectrum signal of each frequency is extracted, the extracted frequency spectrum signal is converted into a time domain signal through IFFT, the square wave is formed through shaping, and the square wave is counted by utilizing a rising edge and stored; if the frequency of the received signal is equal to the guided wave frequency of the transmitted signal, then storing the later received data; if not, discarding the following data;
step 3, noise test of communication modulation-demodulation system
Integrating a data transmitting system and a data receiving system together to form a complete communication transceiving system, utilizing MATLAB to perform test simulation, adding Gaussian white noise to the system, inputting 3 data quantities of temperature, salinity and depth, modulating corresponding frequency and periodicity through a modulation system, setting the signal-to-noise ratio of the system, setting the length of each reading of FFT and IFFT in the demodulation system, setting the central frequency of a frequency domain filter to correspond to four frequencies of transmitted square waves, performing shaping and counting to obtain corresponding data, and calculating the obtained data and the transmitted data to obtain a corresponding error rate which is compared with the error rate of the traditional time domain filtering;
step 4, adding an actual inductive coupling channel to carry out verification experiment
A transmission modulation system is designed by utilizing LABVIEW software, namely, the numerical values of three parameters of temperature, salinity and depth are input, square wave signals formed by combining four different frequencies of guided wave, temperature, salinity and depth are modulated, white Gaussian noise is added to simulate the actual environment, signals of mixed noise are transmitted to an actual marine communication inductive coupling channel, signals passing through the channel are collected by utilizing an NIUSB-6259 data acquisition card, received digital signals are demodulated by using the receiving and demodulating method described in the second step, specific numerical values of the three parameters are obtained, the obtained data and the transmitted data are compared to obtain an error rate, and the error rate is compared with the error rate generated by the traditional time domain demodulating method.
2. The method as claimed in claim 1, wherein the frequency domain demodulation method with multichannel parallel processing adopts a parallel structure for the whole demodulation part, and the multichannel parallel processing is performed on the received signals and simultaneously demodulates the sent values of the temperature, salinity and depth parameters to accelerate the processing speed.
3. The method of claim 1, wherein the frequency-domain filtering filter is a frequency-domain window filter, each parameter corresponds to a window filter with a different center frequency, and the baseband spectrum of each parameter is extracted.
4. The method of claim 1, wherein the multichannel parallel processing frequency domain demodulation method is adapted to a multi-carrier baseband and FSK hybrid modulation method based on the inductively coupled thermohaline deep link, and the number of the demodulation part filters and the size of the center frequency are completely matched with those of the modulation part, so that the method is suitable for the ocean communication system of the inductively coupled thermohaline deep link.
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