CN108896981A - A kind of acquisition of time-sharing multiplex sonar array data and beam-forming device and system - Google Patents
A kind of acquisition of time-sharing multiplex sonar array data and beam-forming device and system Download PDFInfo
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- CN108896981A CN108896981A CN201810436645.8A CN201810436645A CN108896981A CN 108896981 A CN108896981 A CN 108896981A CN 201810436645 A CN201810436645 A CN 201810436645A CN 108896981 A CN108896981 A CN 108896981A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/523—Details of pulse systems
- G01S7/526—Receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/534—Details of non-pulse systems
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of acquisitions of time-sharing multiplex sonar array data and beam-forming device and system, for acquiring the analog signal of N number of hydrophone of sonar system and carrying out Wave beam forming processing, described device includes a sequentially connected analog switch, an analog-digital converter and a Beam-former；The analog switch connects N number of hydrophone and is used within a sonar system sampling period, and the road N analog signal is input to analog-digital converter respectively；The analog-digital converter, for being input to Beam-former after carrying out digitized sampling to the analog signal of input；The Beam-former is used to carry out adjacent two paths of signals delay compensation, and carries out Wave beam forming processing, beamformer output result to N railway digital signal.The signal that an analog-digital converter acquires multiple array elements is used only in the device of the invention, and structure is simple；And by the way of asynchronous-sampling, sampling holder is not needed；The circuit of the device of the invention and system is simple, and cost is relatively low.
Description
Technical field
The present invention relates to active Sonar signal process field, in particular to a kind of time-sharing multiplex sonar array data acquisition with
Beam-forming device and system.
Background technique
Array signal processing is one of core function of sonar.The purpose is to the signals by receiving array to carry out
Processing enhances useful signal, inhibits useless interference and noise, while extracting the feature of useful signal and signal is included
Information.Space directivity gain can be obtained by array signal processing；Airspace filter is carried out, to inhibit space interference and ring
Border noise improves spatial discrimination and interference rejection capability；Estimate the arrival bearing of signal, is signal source Positioning Creates condition, from
And realize the detection and tracking, Azimuth & Range estimation to target.Array signal processing is widely used in sonar, has important
Meaning.
In multi-channel digital sonar array system, the signal to each channel is needed to sample.It is subsequent for convenience
Array signal processing, mostly use each Channel Synchronous sample mode.Generally there are two types of methods for the realization of synchronized sampling, a kind of
Method is to use independent analog-digital converter, all analog-digital converter common clocks, synchronous acquisition synchronization per signal all the way
Signal；Another method, by synchronization, is temporarily stored per signal all the way, so using multiple sampling holders
Afterwards by analog switch, successively by per amplitude input analog-to-digital converter all the way, it is quantified as digital signal.For method one,
The shortcomings that how many road analog signal input just needing how many a analog-digital converters there is, when array scale is larger, cost
Height, circuit are complicated；Method two only used an analog-digital converter relative to method one, but still use is needed to believe with input
The identical sampling holder of number amount, it is still desirable to more complicated circuit and higher cost.
Summary of the invention
It is an object of the invention to overcome above-mentioned technological deficiency, under the premise of keeping system performance constant, simplify sonar
The circuit of array signal acquisition system thus proposes a kind of new circuit design, an analog-digital converter is used only, and use is different
The mode of sampling is walked, the improvement of associative array signal processing is guaranteeing array signal processing effect and synchronous sampling method
Under the premise of identical, circuit is simplified, reduces system cost.
To achieve the goals above, the invention proposes a kind of acquisitions of time-sharing multiplex sonar array data fills with Wave beam forming
It sets, for acquiring the analog signal of N number of hydrophone of sonar system and carrying out Wave beam forming processing, described device includes successively connecting
An analog switch, an analog-digital converter and the Beam-former connect；
The analog switch connects N number of hydrophone, for respectively simulating the road N within a sonar system sampling period
Signal is input to analog-digital converter；
The analog-digital converter, for being transmitted to Beam-former after carrying out digitized sampling to the analog signal of input；
The Beam-former for carrying out delay compensation to adjacent two paths of signals, and carries out wave beam to N railway digital signal
Formation processing, beamformer output result.
As a kind of improvement of above-mentioned apparatus, the sample rate of the analog-digital converter is the N of sonar system sample rate f s
Times.
As a kind of improvement of above-mentioned apparatus, the analog-digital converter is Δ t=to the time delay of adjacent two-way analog signal
1/(N×fs)。
As a kind of improvement of above-mentioned apparatus, the beam signal Y of the Beam-former outputasync(ω) is：
Wherein, n indicates the label of sonar system array element, 1≤n≤N；The π of ω=2 fs is the angular frequency of signal；Sn(ω) table
Show the signal of n-th of array element, Hn(ω) is the transfer function using n-th of array element when synchronous sampling mode.
The present invention also provides a kind of acquisition of time-sharing multiplex sonar array data and Beam Forming Systems, for acquiring sonar
The analog signal of N number of hydrophone of system simultaneously carries out Wave beam forming processing, and the system comprises K analog switches and mould in parallel
Number converter, the K analog-digital converter are connected to a Beam-former；
Each analog switch connects M hydrophone, is used within a sonar system sampling period, respectively by the road M
Collection of simulant signal is transmitted to analog-digital converter；N=K × M；
Each analog-digital converter, for being transmitted after carrying out digitized sampling to the analog signal of M hydrophone input
To Beam-former；
The Beam-former, for carrying out delay compensation to N railway digital signal and carrying out Wave beam forming processing, output wave
Beam signal.
As a kind of improvement of above system, the sample frequency of the K analog-digital converter is identical, samples for sonar system
M times of fs.
As a kind of improvement of above system, each analog-digital converter is Δ to the time delay of adjacent two-way analog signal
T=1/ (M × fs).
As a kind of improvement of above system, the beam signal Y of the Beam-former outputasync(ω) is：
Wherein, n indicates the label of sonar system array element, 1≤n≤N；K indicates group number, 1≤k≤K；Sn(ω) indicates n-th
The signal of a array element, Hn(ω) is the transfer function using n-th of array element when synchronous sampling mode.
The advantage of the invention is that：
1, the signal that an analog-digital converter acquires multiple array elements is used only in the device of the invention, and structure is simple；
2, the device of the invention does not need sampling holder by the way of asynchronous-sampling；
3, multiple devices can be used to carry out the acquisition of large scale array signal in system of the invention；
4, the device of the invention and system simplify circuit, reduce costs under the premise of keeping sample effect.
Detailed description of the invention
Fig. 1 is the schematic diagram of time-sharing multiplex sonar array the data acquisition and beam-forming device of the embodiment of the present invention 1；
Fig. 2 is the Beam-former transfer function schematic diagram of the embodiment of the present invention 1；
Fig. 3 is the schematic diagram of time-sharing multiplex sonar array the data acquisition and Beam Forming System of the embodiment of the present invention 2；
Fig. 4 is the circuit connection diagram of the system of the embodiment of the present invention 2.
Specific embodiment
The present invention will be described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
As described in Figure 1, a kind of acquisition of time-sharing multiplex sonar array data and Wave beam forming that the embodiment of the present invention 1 provides
Device, the signal of N number of hydrophone for acquiring sonar system have the input of the road N analog signal.The mould of the road N hydrophone output
Quasi- signal passes through the same analog switch jointly, is connected to analog-digital converter；The sample rate of analog-digital converter is adopted for sonar system
N times of sample fs, i.e. N × fs；Within a sonar system sampling period, each road signal is input to modulus respectively and turned by analog switch
Parallel operation；Analog-digital converter to the sampling of adjacent two-way analog signal there are delay inequality Δ t=1/ (N × fs), need by time delay into
Row compensation, then exports to Beam-former, and N road analog signal compensated to time delay carries out Wave beam forming processing, output wave
Beam signal.
When using synchronous sampling mode, the wave beam that sonar system carries out conventional beamformer processing exports Ysync(ω)
For：
In formula (1), the π of ω=2 fsIt is the angular frequency of signal；Sn(ω) indicates the signal of n-th of array element, Hn(ω) is to use
The transfer function (weighting function) of n-th of array element when synchronous sampling mode.
In the present embodiment, on the basis of No. 1 array element, time delay Δ t present in neighbouring sample is compensated, wave beam
The wave beam that shaper carries out conventional beamformer processing exports Yasync(ω) is：
Wherein, n indicates the label of sonar system array element, 1≤n≤N；
In the present embodiment, the sampling of adjacent two-way analog signal is compensated there are delay inequality Δ t according to formula (2)
The transfer function of Beam-former is as shown in Figure 2.
Embodiment 2
As shown in figure 3, the embodiment of the present invention 2 provides a kind of time-sharing multiplex sonar array number on the basis of embodiment 1
According to acquisition and Beam Forming System.
Since switch chip has the limitation for connecting delay and input channel number, when analog-digital converter is established in the presence of sampling
Between and the limitation of maximum sample rate cannot achieve any number of simulations when using single analog switch and single analog-digital converter
Input channel shares an analog-digital converter.In order to solve this problem, in the present embodiment, any number of hydrophones are carried out
Grouping, specific method：According to the performance of analog switch and the performance of modulus conversion chip, single analog-digital converter institute energy is determined
N number of hydrophone is decomposed into K=N/M and (rounded up) group by the maximum analog number of signals M of acquisition, and every group using a simulation
Switch and an analog-digital converter, as shown in Figure 3.Realize that N number of water is listened using K analog switch and K analog-digital converter
The use frequency of the Signal processing of sonar of device, K analog-digital converter is identical, is M times of sonar system sampling fs；At this point, every
There are delay inequality Δ t=1/ (M × fs) for the sampling of adjacent two-way analog signal in group, after being compensated to the delay, wave beam
The wave beam that shaper carries out conventional beamformer processing exports Yasync(ω) is：
In formula (3), n indicates the label of sonar system array element, 1≤n≤N；K indicates group number, 1≤k≤K；Sn(ω) is indicated
The signal of n-th of array element, Hn(ω) is the transfer function using n-th of array element when synchronous sampling mode.
The explanation of scheme is carried out by taking the sonar alignment array 1 system of 32 array elements as an example.
Sonar linear array is structured the formation according to the interval of d, and the sample rate of system is that fs (according to the needs of sonar system, will be adopted
Sample rate is set as 48kHz), using MUX36S16 analog switch chip, AD7982 modulus conversion chip, TMS320C6748 number
Signal processing chip.AD7982 is a 18, successive approximation modulus conversion chip, which has low-power consumption, high speed
Feature, maximum sample rate are 1MSPS.MUX36S16 is modern complementary metal oxide semiconductor analog multiplexer, can be mentioned
For 16:1 single ended channels；Its turn-on and turn-off leakage current is lower, allows such multiplexer high defeated with minimal error conversion
Enter the signal of source of resistance transmission.TMS320C6748 is the Floating-point DSP of a Low Power High Performance, and dominant frequency 456MHz calculates energy
Power reaches 2476MFLOPS.
Circuit diagram is as shown in figure 4,32 array elements (i.e. N=32) are divided into two groups (i.e. K=2), every group of 16 array element (i.e. M
=16).1~No. 16 array element and a piece of analog switch MUX36S16 and a piece of modulus conversion chip AD7982 are as one group；17
~No. 32 array elements and a piece of analog switch MUX36S16 and a piece of modulus conversion chip AD7982 are as another group.Cope and drag pattern
Quasi- switch MUX36S16 common clock and gating signal, two panels modulus conversion chip AD7982 common clock and enabled letter
Number.The sonar sample rate that the work sample rate of modulus conversion chip is 16 times, as 16*fs=768kHz, the sample rate are less than
The device of the maximum sample rate of modulus conversion chip, selection can satisfy the needs of the sample rate；In each group, adjacent two
The sampling time interval of a array element is 1/ (16*fs).In Beam-former, using frequency-domain beamforming.Below with linear array
The conventional beamformer weight (i.e. transfer function) of abeam direction angle theta illustrates the problem.
It is as a reference point with No. 1 array element, i.e. element position 0；The element position of No. 2 array element is d, the array element position of No. 3 array element
It is set to 2d ..., the element position of No. 32 array element is 31d.
Weighted value (the H i.e. in formula (1) of 1~No. 32 conventional beamformer of array element under synchronized samplingn(ω))。
(weight of i.e. n-th array element is)
Wherein the π of ω=2 f is the angular frequency of signal,cIt is the velocity of sound, d is array element spacing
Due to there is the time delay of sampling, need in w aboven-syncThe middle time delay for generating sampling compensates, according to formula
(3) it is as shown in table 1 below to obtain compensated weight：
Table 1：Beam-former weight table
Corresponding array element input signal is weighted using the weight of upper table, add up can be obtained conventional wave beam shape later
At output：
Data acquisition and Wave beam forming are carried out according to the above process, it can obtain carrying out after sampling with 32 Channel Synchronous
The identical result of conventional beamformer process.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (8)
1. a kind of time-sharing multiplex sonar array data acquisition and beam-forming device, for acquiring N number of hydrophone of sonar system
Analog signal and carry out Wave beam forming processing, which is characterized in that described device includes sequentially connected analog switch, one
A analog-digital converter and a Beam-former；
The analog switch connects N number of hydrophone, is used within a sonar system sampling period, respectively by the road N analog signal
It is input to analog-digital converter；
The analog-digital converter, for being transmitted to Beam-former after carrying out digitized sampling to the analog signal of input；
The Beam-former for carrying out delay compensation to adjacent two paths of signals, and carries out Wave beam forming to N railway digital signal
Processing, beamformer output result.
2. time-sharing multiplex sonar array data acquisition according to claim 1 and beam-forming device, which is characterized in that institute
The sample rate for stating analog-digital converter is N times of sonar system sample rate f s.
3. time-sharing multiplex sonar array data acquisition according to claim 2 and beam-forming device, which is characterized in that institute
Stating analog-digital converter is Δ t=1/ (N × fs) to the time delay of adjacent two-way analog signal.
4. time-sharing multiplex sonar array data acquisition according to claim 3 and beam-forming device, which is characterized in that institute
State the beam signal Y of Beam-former outputasync(ω) is：
Wherein, n indicates the label of sonar system array element, 1≤n≤N；The π of ω=2 fs is the angular frequency of signal；Sn(ω) indicates n-th
The signal of a array element, Hn(ω) is the transfer function using n-th of array element when synchronous sampling mode.
5. a kind of time-sharing multiplex sonar array data acquisition and Beam Forming System, for acquiring N number of hydrophone of sonar system
Analog signal and carry out Wave beam forming processing, which is characterized in that the system comprises K in parallel analog switches and modulus to turn
Parallel operation, the K analog-digital converter are connected to a Beam-former；
Each analog switch connects M hydrophone, for respectively simulating the road M within a sonar system sampling period
Signal acquisition is input to analog-digital converter；N=K × M；
Each analog-digital converter, for being transmitted to wave after carrying out digitized sampling to the analog signal of M hydrophone input
Beamformer；
The Beam-former, for carrying out delay compensation to N railway digital signal and carrying out Wave beam forming processing, beamformer output letter
Number.
6. time-sharing multiplex sonar array data acquisition according to claim 1 and Beam Forming System, which is characterized in that institute
The sample frequency for stating K analog-digital converter is identical, M times for sampling fs for sonar system.
7. time-sharing multiplex sonar array data acquisition according to claim 6 and Beam Forming System, which is characterized in that institute
Stating each analog-digital converter is Δ t=1/ (M × fs) to the time delay of adjacent two-way analog signal.
8. time-sharing multiplex sonar array data acquisition according to claim 7 and Beam Forming System, which is characterized in that institute
State the beam signal Y of Beam-former outputasync(ω) is：
Wherein, n indicates the label of sonar system array element, 1≤n≤N；K indicates group number, 1≤k≤K；Sn(ω) indicates n-th of array element
Signal, Hn(ω) is the transfer function using n-th of array element when synchronous sampling mode.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748435A (en) * | 2020-12-16 | 2021-05-04 | 中国船舶重工集团有限公司第七一0研究所 | Submarine mine detonator sonar signal detection hydrophone array and detection value comparison circuit |
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