CN109738050B - Underwater sound platform gateway grid connection point design method - Google Patents
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Abstract
The invention discloses a design method of a grid-connected point of an underwater sound station gateway, which comprises the steps of establishing a grid point file reflecting the grid point monitoring capability and signal parameters of a station by gridding and dividing a monitoring sea area according to definition requirements of underwater sound signal transmission partition parameters and associated events of an underwater sound station, and reflecting the coverage condition of different stations on the same grid point monitoring capability; according to the requirements of the underwater sound platform gateway connection, screening out the grid points meeting the requirements of the underwater sound platform gateway connection, reducing the grid point traversal times and searching and matching of invalid underwater sound station signal, improving the accuracy and efficiency of the underwater sound platform network connection, and performing important support content of the underwater sound platform gateway connection based on a grid point search method. The invention realizes the design of associated grid points, the screening of the associable underwater sound station in a specific area and the estimation of signal matching parameters in the process of the gateway connection of the underwater sound station, and establishes a high-efficiency parameter file of the gateway connection grid points of the underwater sound station, which can be used for actual operation.
Description
Technical Field
The invention belongs to the technical field of underwater sound monitoring, and particularly relates to a method for designing a grid connection point of an underwater sound platform gateway.
Background
The underwater sound monitoring technology is an effective technical means for monitoring underwater explosion events, and as hydrophones adopted by the underwater sound station have high sensitivity, underwater sound signals generated by thousands of kilo equivalent explosions inside and outside a wide water area can be monitored. The international monitoring system for comprehensively prohibiting the nuclear test treaty establishes a global monitoring network comprising 11 underwater acoustic stations, and basically has the capability of monitoring global marine explosion events. The underwater acoustic signals are transmitted in a deep sea channel at the junction of a thermocline nuclear deep sea isothermal layer, namely an acoustic sound channel, the consistency of media is good, and therefore the travel time and the azimuth deviation of the signals in the transmission process are small.
The underwater acoustic monitoring data processing process mainly comprises signal detection, characteristic parameter extraction, signal identification, station network association, equivalent weight estimation and the like. For the underwater acoustic station network, station-gateway connection is needed to find out possible underwater acoustic events after underwater acoustic signal monitoring, azimuth angle, arrival time, signal duration and signal type analysis. The station network association is a main step of signal fusion of different stations and is also an important basis for deeply analyzing events, carrying out equivalent estimation and identifying properties.
The united states is in the leading position in terms of underwater acoustic data processing, and the underwater acoustic data source is the most abundant; the nuclear test treaty organization is prohibited from carrying out underwater sound monitoring data processing from 2001 comprehensively, a large number of events participating in correlation of underwater sound station stations are accumulated, the events comprise an underwater sound-earthquake combined observation event and an underwater sound station network independent observation event, a global uniform lattice point correlation method is adopted, and the method is only specific to seismic signals, so that the processing process is poor in pertinence, the correlation process is complex and the efficiency is low in the underwater sound field.
Disclosure of Invention
The invention provides a method for designing a grid connection point of an underwater sound station gateway, which can provide the monitoring capability and signal parameters of each underwater sound station network to a specified sea area according to the signal transmission path partition parameters and station network distribution of the underwater sound station, and establish a corresponding grid point file, thereby realizing the quick matching and association of underwater sound signals.
In order to solve the technical problem, the invention provides a method for designing a grid connection point of an underwater sound platform gateway, which is characterized by comprising the following steps of:
s1, selecting a sea area range which needs to be subjected to underwater acoustic monitoring data analysis, setting a grid point step length, and creating a network grid point according to the parameters;
s2, setting an underwater sound monitoring station network according to the sea area selected in S1 and the underwater sound monitoring stations distributed around the sea area, wherein each underwater sound station array is classified according to the position of each station to form a plurality of sub-arrays;
s3, respectively setting effective transmission distances of underwater acoustic signal acoustic emission channels of the same type of sub-stations in each sub-array, and carrying out omnidirectional setting on the effective transmission distances according to a certain azimuth angle interval to form underwater acoustic array signal transmission partition parameters comprising different azimuth angles az and corresponding effective transmission distances thereof;
S4、according to the underwater sound monitoring station network composition, reading the azimuth az corresponding to each underwater sound station array signal transmission partition parameter, and calculating the distance D between each subarray and each grid point by using the central coordinate of the ith grid point and the coordinates of the jth underwater sound subarray according to the grid point sequence created by S1ijAnd azimuth Azm of subarrays to each grid pointijEstimating the time T required for the transmission of the underwater acoustic signals from each lattice point to the underwater acoustic subarraysij:
Tij＝Dij*SH(ii) a Wherein S isHIs the underwater sound slowness;
s5, aligning the azimuth Azm of the lattice pointsijMatching with az in the underwater acoustic array signal transmission partition parameters, finding out azimuth angle parameters az (m) closest to the lattice azimuth angle, and if D is met, obtaining a reference valueijWhen the range (m) is less than or equal to, the underwater sound signal generated by the grid point i can be monitored by the underwater sound station subarray j, and the number N of subarrays capable of monitoring the grid point i is countedchanAnd the number of stations N of the underwater acoustic stationsta；
S6, setting the parameter requirements of the gateway joint array of the underwater sound station, including defining the number D of the sub-arrays needed by the underwater sound eventchanAnd the number of arrays DstaIf the conditions are met, the lattice points are reserved, otherwise, the lattice points are deleted, and effective lattice points related to the underwater sound platform network in the designated sea area are obtained;
Nchan≥Dchanand N issta≥Dsta，Nchan≥Nsta。
Has the advantages that: the invention can establish the specific sea area underwater sound station gateway grid connection points according to the definition requirements of the underwater sound signal transmission partition parameters and the underwater sound station associated events, defines the station list and the signal parameters with monitoring capability for each grid point, and can be applied to open water area underwater sound event station grid connection based on a grid point search method. The invention has the following advantages:
1) the invention establishes and applies the underwater sound station signal transmission partition parameters, thereby truly reflecting the blocking effect of islands and coasts on underwater sound channels; by carrying out gridding division on a monitoring sea area, a lattice point file reflecting the lattice point monitoring capability of the stations and signal parameters thereof is created, key parameters for underwater sound station network association are provided, and the coverage condition of different stations on the same lattice point monitoring capability is reflected; and screening out the lattice points meeting the underwater sound platform gateway connection requirements, thereby reducing unnecessary search of low-probability lattice points.
2) The invention realizes the definition of the underwater sound station of the international monitoring system on the monitoring capability and the key parameters of the signal of any sea area, defines the station list of the signals possibly monitored by an event in a certain area, is convenient for the targeted matching of the signals in the process of the underwater sound station gateway connection, reduces the grid point traversal times and the retrieval matching of the signals of invalid underwater sound stations, improves the accuracy and the efficiency of the underwater sound station network connection, and is the important support content of the underwater sound station gateway connection based on the grid point search method.
3) The method can reflect the acoustic signal transmission sound channel condition, and comprises the station list and the acoustic station gateway grid connection point of the key signal parameter, wherein the station list and the key signal parameter can monitor the acoustic event of a certain point location, so that the automatic association and positioning capability of the specific sea area acoustic station network can be realized, and the signal matching and grid point searching efficiency in the acoustic station gateway connection process can be improved.
Drawings
FIG. 1 is a schematic diagram of the distribution of an underwater acoustic station of an international monitoring system for the general inhibition of nuclear test treaties;
fig. 2 is a schematic diagram of the partition parameters of an H01 hydroacoustic station W1 sub-station of the international monitoring system at the australian luyin angle, with the abscissa being the azimuth and the ordinate being the effective monitoring distance.
Fig. 3 is a schematic diagram of the number distribution of monitoring stations in different sea areas by 6 underwater acoustic stations such as H02;
fig. 4 is a schematic diagram of sea area distribution with monitoring capability of a network of stations constructed by 6 underwater acoustic stations such as H02.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.
The invention provides a method for designing a grid connection point of an underwater sound platform gateway, which is characterized by comprising the following steps of:
s1, selectingDetermining the longitude and latitude range [ Lat ] of sea area required to analyze underwater acoustic monitoring datamin,Latmax,Lonmin,Lonmax]Setting a grid point step length gridd, and creating a network grid point according to the parameters;
s2, setting an underwater sound monitoring station network according to the sea area selected in S1 and the underwater sound monitoring stations distributed around the sea area, wherein each underwater sound station array is classified according to the positions of the sub-stations to form a plurality of sub-arrays, and if the sub-stations of the array are distributed at the north and south ends of the island, the three sub-stations of N1, N2 and N3 contained at the north end are collectively called N sub-arrays;
s3, because the sub-arrays of different types of the same underwater sound array are far away, the distance can reach hundreds of kilometers, and the sub-arrays of the same type are close, generally less than 2 km. Therefore, the effective transmission distance of the underwater acoustic signal acoustic emission channel of each type of sub-station is respectively set, and the effective transmission distance is set in an omnidirectional manner according to the 0.5-degree interval of the azimuth angle to form underwater acoustic array signal transmission partition parameters, namely effective transmission distances range corresponding to different azimuth angles az; the underwater acoustic signal transmission partition parameters of different types of sub-arrays of the same array may be different;
s4, according to the underwater sound monitoring station network, reading each underwater sound array signal transmission partition parameter, according to the grid point sequence created by S1, using the grid point center coordinate (Lat)i,Loni) With each underwater acoustic subarray coordinate (Latt)j,Lontj) Calculating the distance D between the subarray and the grid pointijAnd azimuth Azm of subarrays to each grid pointijEstimating the time T required by the underwater sound signal to be transmitted from the lattice point to the underwater sound subarray according to the underwater sound travel time model (1)ij:
Tij＝Dij*SH (1)
Wherein S isHIs the underwater slowness, 74.879s, corresponding to a speed of sound 1485 m/s.
S5, azimuth AzmijMatching with azimuth az in underwater acoustic array signal transmission partition parameters, finding out the nearest lattice point azimuth parameter az (m), and if D is metijWhen the range (m) is less than or equal to, the underwater sound station subarray j can monitor the lattice pointi, counting the number N of subarrays capable of monitoring the lattice point ichanAnd the number of stations N of the underwater acoustic stationstaSince an underwater acoustic station may have multiple sub-arrays (or sub-stations) of different types, when more than one sub-array can monitor signals, the underwater acoustic station is considered to have monitoring capability, NstaThe count of (1) is added; range (m) is the effective transmission distance corresponding to az (m);
s6, setting the parameter requirements of the gateway joint array of the underwater sound station, including defining the number D of the sub-arrays needed by the underwater sound eventchanAnd the number of arrays DstaIf the conditions are met, the lattice points are reserved, otherwise, the lattice points are deleted, and effective lattice points related to the underwater sound platform network in the designated sea area are obtained;
Nchan≥Dchanand N issta≥Dsta，Nchan≥Nsta (2)
In the valid lattice points determined in S7 and S6, each lattice point includes a lattice point center coordinate, a subarray having monitoring capability and its parameters (including station-to-lattice point distance, azimuth angle, signal theoretical transmission time), the number of subarrays and underwater acoustic arrays having monitoring capability for the lattice point, whether the current underwater acoustic network has monitoring capability for the lattice point, and the like. By utilizing the lattice points, the underwater sound array signals can be quickly matched and associated with the signals, and the occurrence positions of events can be preliminarily determined.
The underwater acoustic array is an underwater acoustic array of a national monitoring system built by a nuclear test treaty organization which is forbidden comprehensively, and generally refers to monitoring sites for recording underwater acoustic signals of various types of installed hydrophones; the underwater sound platform network is a monitoring network formed by a certain number of underwater sound platform arrays distributed in different ways; the underwater sound sub-array is an underwater sound signal monitoring array formed by more than two closely distributed underwater sound monitoring sub-stations; the underwater sound monitoring sub-station is an independent monitoring station in an underwater sound array; the underwater acoustic data refers to data recorded by an underwater acoustic sensor; the underwater sound signal travel time refers to the time required for transmitting the underwater sound signal from a source item to a monitoring station; the azimuth angle is an included angle between a line connecting the array to the source item and the true north direction; the slowness refers to the time required for transmitting a radian signal; the signal correlation refers to an automatic search matching process of the recorded signals of the underwater sound array with the capability of monitoring a certain event.
The effective transmission distance refers to the farthest monitoring distance of the underwater sound station along a certain direction;
the underwater sound signal transmission partition parameter is defined by effective transmission distances of the underwater sound signals in different directions by taking an underwater sound station as a center, and the effective transmission distances in different directions are different for a given underwater sound station due to the influence of islands and lands;
the grid points refer to grids divided according to a certain step length for the designated area;
the grid point center refers to the center position of the grid point, and the grid point center represents the whole grid point;
the lattice point step length refers to the distance between the center points of two adjacent lattice points;
the associated lattice points refer to a lattice point parameter file for the gateway connection of the underwater sound platform, and comprise key monitoring parameters of each sub-platform in a specified underwater sound platform network to each lattice point, including monitoring distance, azimuth angle, theoretical transmission time of each sub-platform and the lattice point, whether the lattice point has monitoring capability, the number of the sub-platforms with the monitoring capability and the number of stations with the monitoring capability.
FIG. 1 is a diagram of a distribution of stations for underwater acoustic monitoring of the International monitoring System for the general inhibition of Nuclear test treaty, covering the Pacific, Atlantic and Indian oceans, for which coverage by stations in substantially any area is guaranteed. For an independent underwater acoustic station, two sub-arrays (or sub-stations) are usually included, and in order to accurately measure the azimuth and the speed of a signal by using the underwater acoustic station arrays, each sub-station comprises three independent monitoring units, and the unit interval is about 2 km; while the subarrays are relatively far apart, typically tens of kilometers, of the 11 stations, the subarrays are at a maximum distance of 220 km. Fig. 2 shows the H01 hydroacoustic station W1 sub-station signal exclusion parameters at the australian luyin angle, which substantially reflect the azimuth and farthest distance from which the sub-array can receive the hydroacoustic signals. For the same underwater acoustic station, due to the distribution difference, some sub-arrays are distributed at two ends of the island, so that the signal separation parameters of different sub-arrays are different.
Setting the grid step length for a certain selected sea area, and establishing a uniform grid; aiming at a target monitoring sea area, stations are selected from the underwater sound stations shown in fig. 1 to form a targeted underwater sound monitoring station network, then, according to the signal isolation parameters of each subarray in the station network, each grid point is sequentially analyzed according to the steps of three to six, the submetals with monitoring capability for each grid point, the signal theoretical parameters corresponding to the signals transmitted to the submetals, the number of the submetals with monitoring capability for the grid point and the number of the underwater sound station stations are determined, and the influence of the remote transmission attenuation of the signals on the monitoring capability is not considered due to the reduction of the attenuation of the underwater sound signals.
The number of the associated stations and the number of the associated subarrays are limited in the process of defining the underwater acoustic event to ensure the accuracy of automatic association of the underwater acoustic event, and one underwater acoustic event is defined to contain at least 2 underwater acoustic stations and not less than 3 subarrays according to an underwater acoustic audit event submitted by an international data center for comprehensive prohibition of nuclear test treaty. And screening all the associated grid points which are defined and can be used for monitoring the station and the signal parameters according to the underwater acoustic event definition standard, and reserving the grid points which meet the event definition standard, thereby forming a viewpoint grid point parameter file for the selected sea area underwater acoustic event station network.
Implementation example:
table 1 example of hydroacoustic station gateway grid point parameters
| Grid point latitude | Grid point longitude | ||
| -1 | -161 | ||
| Subarray (desk) | Distance (°) | Azimuth (°) | Signal travel time(s) |
| H02N1 | - | - | - |
| H02S1 | - | - | - |
| H03N1 | 82.8 | 273.6 | 6202 |
| H03S1 | 82.9 | 273.5 | 6210 |
| H06E1 | 53.0 | 253.8 | 3968 |
| H06N1 | 52.9 | 253.7 | 3966 |
| H06S1 | 52.9 | 253.8 | 3965 |
| H09N1 | - | - | - |
| H09W1 | - | - | - |
| H10N1 | - | - | - |
| H10S1 | - | - | - |
| H11N1 | 37.7 | 119.6 | 2822 |
| H11S1 | 37.3 | 118.1 | 2790 |
| Number of subarrays | Number of stations | Whether or not to monitor | |
| 7 | 3 | 1 |
According to the distribution of the underwater acoustic station network of the international monitoring system shown in fig. 1, aiming at the requirements of monitoring and associating the underwater acoustic events in the pacific ocean, six underwater acoustic stations such as H02, H03, H06, H09, H10 and H11 can be selected to establish a monitoring network, wherein the H11 station is located in the wecker island; the method has strong monitoring capability in all directions, and H02, H03 and H06 are positioned on the west coast of the continental america and are mainly monitored in the west direction; two stations H09, H10 are located in the atlantic ocean, with only ten-redundant monitoring windows for the pacific ocean. Table 1 shows a table gateway connection point file corresponding to a grid point with a center of the grid point being (-1 °, -161 °) after setting the grid point according to a step length of 1 °, and as can be seen from the grid point file, 7 subarrays of three underwater acoustic stations H03, H06, and H11 have a monitoring capability for the grid point, and provide a time required for transmitting an underwater acoustic signal to a station and an azimuth relationship between the station and the grid point when an underwater acoustic event occurs at the grid point, and the parameters can be used for accurately matching the underwater acoustic signal in the process of connecting the underwater acoustic station gateway. Fig. 3 shows that the underwater sound monitoring station network constructed by the 6 underwater sound stations has monitoring capability distribution, so that more than 4 stations can be simultaneously monitored in most regions of the pacific ocean, and certain monitoring capability is provided for the atlantic ocean and even part of the Indian ocean. Fig. 4 is a regional distribution of the underwater acoustic event, which can be formed by correlating the underwater acoustic data of the station determined according to the underwater acoustic event definition requirement.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for designing a grid connection point of an underwater sound platform gateway is characterized by comprising the following steps:
s1, selecting a sea area range which needs to be subjected to underwater acoustic monitoring data analysis, setting a grid point step length, and creating grid points;
s2, setting an underwater sound station network according to the sea area selected in S1 and the underwater sound station distributed around the sea area, wherein each underwater sound station array is classified according to the position of the sub station to form a plurality of sub arrays;
s3, respectively setting effective transmission distances of underwater acoustic signal acoustic emission channels of the same type of sub-stations in each sub-array, and carrying out omnidirectional setting on the effective transmission distances according to a certain azimuth angle interval to form underwater acoustic array signal transmission partition parameters comprising different azimuth angles az and corresponding effective transmission distances thereof;
s4, according to the underwater sound platform network, reading the azimuth az corresponding to the signal transmission partition parameter of each underwater sound platform array, and according to the grid point sequence created by S1, calculating the distance D between each sub-array and each grid point by using the center coordinate of the ith grid point and the coordinates of the jth underwater sound sub-arrayijAnd azimuth Azm of subarrays to each grid pointijEstimating the time T required for the transmission of the underwater acoustic signals from each lattice point to the underwater acoustic subarraysij:
Tij＝Dij*SH(ii) a Wherein S isHIs the underwater sound slowness;
s5, aligning the azimuth Azm of the lattice pointsijMatching with the azimuth az corresponding to the underwater acoustic array signal transmission partition parameter, finding out the azimuth parameter az (m) closest to the lattice azimuth, and if D is metijWhen the range (m) is less than or equal to, the underwater sound subarray j can monitor the underwater sound signal generated by the lattice point i, and the number N of the subarrays with the monitoring capability on the lattice point i is countedchanAnd the number of stations N of the underwater acoustic stationsta；
S6 setting gateway connection station of underwater sound stationArray parameter requirements including the number of subarrays D required to define an underwater acoustic eventchanAnd the number of arrays DstaWhen N is satisfiedchan≥DchanAnd N issta≥Dsta，Nchan≥NstaAnd if not, deleting the lattice points to obtain the effective lattice points associated with the underwater sound platform network in the designated sea area.
2. The method of claim 1, wherein in S2, if the sub-stations of each underwater acoustic station array are distributed at the north and south ends of the island, the three sub-stations N1, N2 and N3 included at the north end are collectively referred to as N sub-arrays.
3. The method of claim 1, wherein different types of subarrays of the same underwater acoustic stage array are far apart, up to hundreds of kilometers, and wherein the same type of subarrays are close, typically less than 2 km.
4. The method of claim 1, wherein S is a design method of a grid connection point of the gateway of the underwater sound platformH74.879s, corresponding to a speed of sound of 1485 m/s.
5. The method according to claim 1, wherein in S5, when more than one subarray can monitor a signal, the corresponding underwater acoustic array is considered to have monitoring capability, NstaThe count of (c) is incremented by 1.
6. The method according to claim 1, wherein the effective lattice points determined in S6 include a lattice center coordinate, a subarray having monitoring capability and its parameters, a subarray having monitoring capability for the lattice point, and the number of the underwater acoustic array.
7. The method as claimed in claim 1, wherein fast matching and signal correlation are performed on the underwater acoustic platform gateway grid-connected points according to the valid grid points, and the occurrence position of the event is preliminarily determined.
8. The method according to any one of claims 1 to 7, wherein the effective transmission distance is the farthest monitoring distance of the underwater acoustic station along a certain direction.
9. The method as claimed in claim 8, wherein the center of the grid point is the center of the grid point, and the center of the grid point represents the whole grid point.
10. The method of claim 8, wherein effective transmission distances in different directions for a given underwater acoustic station are different.
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