CN110167114A - A kind of underwater acoustic communication waking up nodes signal detecting method based on frame synchronizing signal - Google Patents
A kind of underwater acoustic communication waking up nodes signal detecting method based on frame synchronizing signal Download PDFInfo
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- CN110167114A CN110167114A CN201910402434.7A CN201910402434A CN110167114A CN 110167114 A CN110167114 A CN 110167114A CN 201910402434 A CN201910402434 A CN 201910402434A CN 110167114 A CN110167114 A CN 110167114A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of underwater acoustic communication waking up nodes signal detecting method based on frame synchronizing signal.Existing method is since the influence of impulsive noise and specific environment noise causes testing result reliability not high, and the computation complexity in underwater detection process for a long time is higher with cross-correlation test correlation technique for frequency detecting.The method of the present invention is the corresponding MT signal of each joint structure in communication network first, the preliminary energy commodity inspection of two isometric slide window implementations is arranged in receiving end to survey, then the signal after being surveyed using Goertzel algorithm to preliminary energy commodity inspection carries out the confirmation of MT frequency, realizes that reliable signal reaches detection.This method is suitable for the subsurface communication network with multiple communication nodes, realizes the accurate wake-up to destination node by MT signal, and computation complexity is low, can reduce underwater sound communication network node and carry out the energy consumption that signal reaches detection for a long time in the dormant state.
Description
Technical field
The invention belongs to Underwater acoustic signal processing technical fields, and in particular to a kind of underwater acoustic communication based on frame synchronizing signal
Waking up nodes signal detecting method.
Background technique
As marine resources development, underwater environment monitoring requirements increase, underwater observation equipment is constantly disposed, underwater wireless
Communication more and more attention has been paid to.Sound wave is the main carriers of current underwater wireless information transmission, while underwater acoustic network can be neatly
Applied to different covering scales, water depth, network structure scene, can be widely used in ocean environment observation, realize water
Information exchange between the lower multiple observation devices of different spatial.
In practical underwater acoustic communication system, communication node needs to work long hours under water and supply by from charged pool
Electricity is high to the power consumption requirements of communication equipment.Underwater sound communication node is generally half-duplex operating mode, major function when no transmission task
Unit in a dormant state, carries out signal by low-power consumption attendant device and reaches detection.Therefore correct to detect arriving for wake-up signal
It is the basis that underwater acoustic communication receiver carries out subsequent processing up to particularly significant.For the arrival of real-time detection wake-up signal, one is needed
The signal arrival detection method of a reliable, low computation complexity, sound are led to receiver attended circuit and are reached using the signal of setting
After detection method detects that wake-up signal reaches, wakes up main equipment and carry out follow-up signal processing.
Common signal arrival detection method has energy measuring, frequency detecting and utilizes signal pulse pressure in underwater sound communication
The cross-correlation test of contracting characteristic.Wherein energy measuring is sentenced according to whether the inscribed receipts signal energy of certain time is greater than given threshold
Whether break signal reaches, and this method is realized simply, but the noise comparison result for receiving signal is affected, vulnerable to impulsive noise
Interference；Frequency detecting is according to the energy and fixed threshold received on the specific frequency point of signal or according to the floating threshold of certain rule
Value is compared judge whether it is wake-up signal, and major defect is that frequency resolution is affected by operational capability, and to environment
The adaptive ability of noise is poor；Cross-correlation test utilizes the signal such as linear FM signal with good pulse compression characteristics
Deng carry out matched filtering detection, the method detection performance preferably but computation complexity highest, be not suitable for attended circuit and carry out letter
Number reach detection scene.
Summary of the invention
Not high, frequency detecting method complexity that the purpose of the present invention is to energy detection method reliabilities excessively it is high not
Foot, provides a kind of underwater acoustic communication waking up nodes signal detecting method based on frame synchronizing signal.Object of the present invention is to be directed to water
Signal in sound group-net communication reaches detection part, using the frame synchronizing signal in communication as wake-up signal.The method of the present invention
Without sending additional wake-up signal, using the frame synchronizing signal in underwater sound communication, such as linear FM signal LFM, Hyperbolic Frequency Modulation
Signal HFM etc. realizes that reliable signal reaches detection in low-power consumption attended circuit.
Specific steps of the method for the invention are:
Step 1. sending node sends frame synchronizing signal as wake-up signal:
The collection of n communication node is combined into D={ d in network1,…,di,…,dj,…,dn}；As node diWithout the task of transmission
When, it is in low-power consumption reception state, signal is carried out by attended circuit and reaches detection；As node diWhen thering are data to send task, hair
Send frame synchronizing signal and data-signal, receiving node djSignal, which is carried out, according to frame synchronizing signal reaches detection.
Step 2. sliding window energy commodity inspection is surveyed:
The sliding window W that two adjacent length are N is arranged in receiving node1And W2, constitute the circular buffering that length is 2N
Area, length of window are less than frame synchronizing signal length；
Q moment window W1In include sampled point [x (q+1), x (q+2) ... x (q+N)]；
Q moment window W2In include sampled point [x (q+N+1), x (q+N+2) ... x (q+2N)]；
Q+1 moment W after window sliding1In be updated to [x (q+2), x (q+3) ... x (q+N+1)], W comprising sampled point2In
[x (q+N+2), x (q+N+3) ... x (q+2N+1)] is updated to comprising sampled point；
Iterate to calculate two window energy E1And E2:
Obtain energy quotient: V (q)=E2(q)/E1(q)；
Set energy quotient detection threshold value VTIf this moment energy quotient V (q) > VT3 frequency detectings are then entered step, are otherwise existed
It is carried out being cyclically updated detection process according to subsequent sampling value in step 2.
Step 3. receiving node djFrequency detecting confirmation is carried out to frame synchronizing signal:
Node djFrequency detecting confirmation is carried out to the signal received on the basis of step 2 detects successfully；Underwater sound communication
Middle frame synchronizing signal such as LFM, HFM signal is swept-frequency signal, frequency variation can be approximately considered within a certain period of time be it is linear,
Signal can be completed under low computation complexity using this frequency variation relation reaches detection.
Enabling the frame synchronizing signal duration is T, and frequency sweep start-stop frequency is respectively f1And fh, receiving node sample rate is Fs, complete
It is denoted as [x in chronological order at the signal received after preliminary energy measuring1xgap x2xgap…xm xgap…xM].Take M group at equal intervals
Signal xmFFT transform is done, its frequency domain value X is obtainedm, according to the frequency-domain result X of M group sampled signalmCarry out frequency confirmation.Every group
Signal includes K sampled point, i.e. xm={ xm(0),xm(1),…xm(K-1) }, Xm={ Xm(0),Xm(1),…Xm(K-1) }, adjacent
Time interval is T between two groups of sampled signalsP, MK/F at this times+(M-1)Tp< T, K < < FsT。
To m group signal xmFFT result Xm, its frequency domain maximum value P is found out firstmAnd its corresponding frequency fm, simultaneously
Calculate the mean value P of in-band noisemn.According to signal frequency domain energy Pm, noise energy mean value PmnWith the frequency of two adjacent groups sampled signal
Difference obtains the frequency detecting result R of m group signalm, work as RmThen the sampling group signal frequency detects successfully when=1, and otherwise detection is lost
It loses.When having more thanGroup signal meets frequency detecting condition and then judges that signal arrival detects successfully, it may be assumed that
Wherein GTFor frequency detecting threshold value, Δ f=(fh-fl)TpFrequency difference of/the T between two adjacent groups sampled signal.
After step 4. detects successfully, receiving node low-power consumption attendant device wakes up main system, and envoy's point enters working condition；
Otherwise judge that the signal received is not frame synchronizing signal, signal reaches detection failure, return step 2.
In the present invention sliding window also include block sliding, every time slide certain length group of data points at the short frame of sampling,
As in step 2 x (q) can indicate the sampled point for being included in the short time energy and, i.e.,Wherein NxTo adopt
The sampling number that the short frame of sample includes, r (i) are the reception signal of corresponding time.
The beneficial effects of the present invention are:
The method of the present invention combines the advantage of energy measuring and frequency detecting, first with the low double slidings of computation complexity
Window energy quotient's method is detected to receive the higher part of energy in signal, is then received and believed using the judgement of multi-frequency detection method
Number whether it is wake-up signal, testing result is made to have more robustness.
The method of the present invention using in underwater sound communication comprising the frame synchronizing signal before sending data-signal as wake-up signal,
Sending node reduces transmission section without sending the wake-up signal with distinctive signal structure to receiving node before the communication starts
Energy consumption when point carries out data transmission.
Detailed description of the invention
Fig. 1 is underwater acoustic network structural schematic diagram；
Fig. 2 is that signal reaches detection frame structural schematic diagram；
Fig. 3 the method for the present invention flow chart；
Fig. 4 is that sliding window signal reaches detection and frequency detecting confirmation schematic diagram.
Specific embodiment
The present invention is described in further details below in conjunction with attached drawing.
A kind of underwater acoustic communication waking up nodes signal detecting method based on frame synchronizing signal, system model such as Fig. 1 institute
Show, underwater sound communication network node set D={ d1,d2,d3,d4, there are 3 fixed underwater sensing nodes, a mobile node is used for
Data are collected, here with node d4To node d1Data collection request is initiated to illustrate specific work steps of the present invention.Send signal
Frame structure is as shown in Fig. 2, setting signal detects false-alarm probability pf=10-6, detecting frame synchronizing signal used is LFM signal, frequency sweep
Range is 16~22KHz, duration T=50ms, receiving node low-power consumption attended circuit sample rate fsFor 50KHz.
As shown in figure 3, this method is realized especially by following steps:
Step 1. node d4To node d1It is as follows to send LFM frame synchronizing signal format:
S (t)=cos (2 π flt+πBt2), 0≤t < T (1)；
Wherein flFor frequency sweep initial frequency, B=(fh-fl)/T is frequency sweep slope, and the instantaneous frequency for receiving signal can indicate
For f (t)=fl+ Bt, in a shorter time window, it is believed that the frequency for receiving signal remains unchanged.
Step 2. node d1Sliding window length N=1000, duration 20ms, energy quotient's detection threshold value V are setT
=1.4.
Initial window sampled value x (q) first, 0≤q < 2N,
Posterior nodal point d is completed in initialization1Sliding window energy quotient's iterative process is carried out according to the sampled data newly obtained,
Add operation has faster arithmetic speed compared to multiplication in attended circuit, and renewal process can indicate are as follows:
Wherein x (q) is the sampled value at q moment, when Dual-window energy quotient V is less than threshold value VTWhen, receiving node is in step 2
Middle progress loop iteration detection process.When window sliding is to position as shown in Figure 4, window W2Contain the higher signal of energy
Part, at this time energy quotient VT=1.41, it is greater than threshold value VT, energy measuring is successful, enters step 3 signal frequency detection process.
Step 3. node d1It completes after preliminary energy commodity inspection survey passes through, as shown in figure 4, at the beginning of taking the equally spaced completion of M=3 group
Walk the signal x of energy measuringm(k) FFT transform is done, its frequency domain value X is obtainedm(k), frequency confirmation, every group of signal FFT length K are carried out
=128 sampled points, the time interval between two adjacent groups signal are Tp=10ms is spaced 500 sampled points, two groups of FFT
Frequency interval Δ f=(f between signalh-fl)Tp/ T=1.2KHz.
The FFT frequency-domain result of three groups of signals at this time: P1=40.4, P1n=5.5, f1=18.4KHz；P2=37.3, P2n=
5.6, f2=19.5KHz；P3=43.9, P3n=6.1, f3=21.6KHz；Signal frequency point detection threshold value GT=5.R is calculated1
=R2=1.
Step 4. node d1Wake-up signal is had received according to energy quotient testing result and the judgement of frequency detecting result.Low function
It consumes attended circuit and wakes up main system progress follow-up signal processing, complete entire signal and reach detection process.
Claims (1)
1. a kind of underwater acoustic communication waking up nodes signal detecting method based on frame synchronizing signal, it is characterised in that this method is specific
Step is:
Step (1) sending node sends frame synchronizing signal as wake-up signal:
The collection of n communication node is combined into D={ d in network1,…,di,…,dj,…,dn}；As node diWhen without the task of transmission, place
In low-power consumption reception state, signal is carried out by attended circuit and reaches detection；As node diWhen there are data to send task, it is same to send frame
Walk signal and data-signal, receiving node djSignal, which is carried out, according to frame synchronizing signal reaches detection；
Step (2) sliding window energy commodity inspection is surveyed:
The sliding window W that two adjacent length are N is arranged in receiving node1And W2, constitute the cyclic buffer that length is 2N, window
Mouth length is less than frame synchronizing signal length；
Q moment window W1In include sampled point [x (q+1), x (q+2) ... x (q+N)]；
Q moment window W2In include sampled point [x (q+N+1), x (q+N+2) ... x (q+2N)]；
Q+1 moment W after window sliding1In be updated to [x (q+2), x (q+3) ... x (q+N+1)], W comprising sampled point2In include
Sampled point is updated to [x (q+N+2), x (q+N+3) ... x (q+2N+1)]；
Iterate to calculate two window energy E1And E2:
Obtain energy quotient: V (q)=E2(q)/E1(q)；
Set energy quotient detection threshold value VTIf this moment energy quotient V (q) > VT(3) frequency detecting is then entered step, otherwise in step
Suddenly it is carried out being cyclically updated detection process according to subsequent sampling value in (2)；
Step (3) receiving node djFrequency detecting confirmation is carried out to frame synchronizing signal:
Enabling the frame synchronizing signal duration is T, and frequency sweep start-stop frequency is respectively f1And fh, receiving node sample rate is Fs, complete just
The signal received after step energy measuring is denoted as [x in chronological order1 xgap x2 xgap…xm xgap…xM]；Take M group equally spaced
Signal xmFFT transform is done, its frequency domain value X is obtainedm, according to the frequency-domain result X of M group sampled signalmCarry out frequency confirmation；Every group of letter
Number include K sampled point, i.e. xm={ xm(0),xm(1),…xm(K-1) }, Xm={ Xm(0),Xm(1),…Xm(K-1) }, adjacent two
Time interval is T between group sampled signalP, MK/F at this times+(M-1)Tp< T, K < < FsT；
To m group signal xmFFT result Xm, its frequency domain maximum value P is found out firstmAnd its corresponding frequency fm, calculate simultaneously
The mean value P of in-band noisemn；According to signal frequency domain energy Pm, noise energy mean value PmnIt is obtained with the frequency difference of two adjacent groups sampled signal
Obtain the frequency detecting result R of m group signalm, work as RmThen the sampling group signal frequency detects successfully when=1, otherwise detection failure；
When having more thanGroup signal meets frequency detecting condition and then judges that signal arrival detects successfully, it may be assumed that
Wherein GTFor frequency detecting threshold value, Δ f=(fh-fl)TpFrequency difference of/the T between two adjacent groups sampled signal；
After step (4) is detected successfully, receiving node low-power consumption attendant device wakes up main system, and envoy's point enters working condition；It is no
Then judge that the signal received is not frame synchronizing signal, signal reaches detection failure, return step (2).
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