CN106405650A - Underwater acoustic array system having rapid acquisition unit address distribution function - Google Patents

Abstract

The invention relates to an underwater acoustic array system, which is an underwater acoustic array system that provides the function of quickly allocating addresses of acquisition units. The technical solution adopted in the present invention is that the underwater acoustic array system with the function of quickly assigning the address of the acquisition unit is composed of five parts: a preprocessing module, a command line, a data line, an acquisition unit and an underwater acoustic sensor. line, and send address allocation commands to each acquisition unit at the lower level, and each acquisition unit completes the setting of the local address after receiving the command, and forwards the processed address allocation command to the next level; the frame structure of the address allocation command Divided into identification code and address code. Among them, the identification code is used to distinguish different downlink commands; the address code is used to set the address of each acquisition unit, and automatically adds 1 after the address allocation of each acquisition unit is completed, and is used for the address allocation of the next-level acquisition unit. The invention is mainly applied to the design and manufacture of underwater acoustic arrays.

Description

Underwater Acoustic Array System with Rapid Address Assignment of Acquisition Units

technical field

The invention relates to an underwater acoustic array system, in particular to a towed sonar line array system.

Background technique

The underwater acoustic array system is one of the most important means of obtaining marine information. A large number of submarine oil reservoirs, submarine geological structures, submarine minerals, marine fish density and behavior characteristics, marine military monitoring and other information are all realized using this technology. The underwater acoustic array system adopts the method of artificially exciting seismic waves, receives echo signals through the hydrophone array, processes and interprets the collected data, judges the distribution of seabed oil and gas resources, stratum structure and rock properties, and studies basin types and fault development , activity and regional seismic hazard, and judge the possibility of marine earthquakes.

The traditional underwater acoustic array system, whose system structure is shown in Figure 1, is connected by a cascaded structure, and is mainly composed of five parts: preprocessing module, command line, data line, acquisition unit and underwater acoustic sensor (hydrophone) . Among them, the function of the preprocessing module is mainly to complete the transmission of the synchronous clock and downlink commands, and the reception of signal collection data, and finally upload the received data to the control center on board for storage and display; the acquisition unit mainly completes the multi-channel hydrophone Acquisition, integration and uploading of device signals. During the operation of the system, the sound source emits a sound wave beam at a fixed frequency. The acoustic beam is reflected by different formations to obtain different formation reflection signals, which are received by the hydrophones in the hydroacoustic array in real time, and each acquisition unit uploads the received data to the ship's control system step by step.

Since the underwater acoustic array system is composed of multi-section array cables and acquisition units, each acquisition unit is also randomly connected during the installation process. Therefore, the addresses of different acquisition units need to be allocated in order to improve the flexibility of the system.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention aims to provide an underwater acoustic array system with the function of quickly assigning addresses of acquisition units. The technical solution adopted by the present invention is that the underwater acoustic array system with the function of quickly assigning the address of the acquisition unit is composed of five parts: a preprocessing module, a command line, a data line, an acquisition unit, and an underwater acoustic sensor. The control center passes through the preprocessing module. line, and send address allocation commands to each acquisition unit of the lower level, and each acquisition unit completes the setting of the local address after receiving the command, and forwards the processed address allocation command to the next level; the frame structure of the address allocation command Divided into identification code and address code. Among them, the identification code is used to distinguish different downlink commands; the address code is used to set the address of each acquisition unit, and automatically adds 1 after the address allocation of each acquisition unit is completed, and is used for the address allocation of the next-level acquisition unit.

Acquisition unit is provided with FPGA hardware logical structure, and described FPGA hardware logical structure comprises following module:

The command identification module is used for identifying address allocation commands issued by the preprocessing module or the upper-level acquisition unit;

The address cache module is used to cache the address code in the address allocation command;

The data integration and sending module is used to integrate the data received from the lower-level acquisition unit with the address of the local acquisition unit, and send the integrated data frame to the upper-level acquisition unit or the preprocessing module;

A command sending module, configured to send an updated address assignment command to the lower-level acquisition unit;

Address + 1 cache module, used to add 1 to the received address code and cache it;

The data receiving module is used to receive the data uploaded by the lower-level acquisition unit;

The local data module is used to cache the data collected by the local collection unit.

Features and beneficial effects of the present invention are:

The underwater acoustic array system of the present invention designs a hardware logic structure capable of quickly responding to downlink commands by sending downlink address allocation commands. When the command reaches the last-level acquisition unit, the address allocation to all acquisition units in the system can be completed. Furthermore, a fast fault location method is proposed, which can enable the system to quickly locate the location of the fault and provide convenience for subsequent system maintenance.

Description of drawings:

Fig. 1 is a structural block diagram of a traditional underwater acoustic array system;

Fig. 2 is the address assignment model figure of the present invention;

Fig. 3 is an address assignment command frame structure diagram of the present invention;

Fig. 4 is a hardware logical structure diagram of the acquisition unit of the present invention;

Fig. 5 is a structure diagram of the acquisition unit data frame of the present invention;

Fig. 6 is a time-consuming model diagram of the acquisition unit address allocation of the present invention;

in the picture

1: sea level; 2: tugboat; 3: sound source; 4: sound wave; 5: formation reflection signal; 6: seabed formation; 7: array; 8: preprocessing module; 9: command line; 10: data line; 11 : Acquisition unit; 12: Sensor; 13: Command recognition module; 14: Address cache module; 15: Data integration and sending module; 16: Command sending module; 17: Address+1 cache module; 18: Data receiving module; 19: Local data module; 20: ship control center; 21: preprocessing module; 22: collection unit 1; 23: collection unit 2; 24: collection unit N

detailed description

The technical problem to be solved by the present invention is to provide an underwater acoustic array system capable of quickly allocating addresses of acquisition units.

The technical scheme adopted in the present invention is:

The underwater acoustic array system of the present invention designs a hardware logic structure capable of quickly responding to downlink commands by sending downlink address allocation commands. When the command reaches the last-level acquisition unit, the address allocation to all acquisition units in the system can be completed. Furthermore, a fast fault location method is proposed, which can enable the system to quickly locate the location of the fault and provide convenience for subsequent system maintenance.

An underwater acoustic array system of the present invention will be described in detail below with reference to the drawings and specific embodiments.

As shown in Figure 2, the rapid address assignment process of the acquisition unit is as follows: 1) The control center on the ship sends address assignment commands to each acquisition unit at the lower level through the preprocessing module and the synchronization and command line. 2) After receiving the command, each collection unit completes the setting of the local address, and forwards the processed address allocation command to the next level.

As shown in FIG. 3 , the frame structure of the address allocation command in the present invention is divided into an identification code and an address code. Among them, the identification code is used to distinguish different downlink commands; the address code (4'b0000-4'b1111) is used to set the address of each acquisition unit, and its initial value is 4'b0000, which will automatically Adding 1 is used for the address allocation of the acquisition units at the next level. It can be seen from this that the underwater acoustic array system in the present invention can realize the address allocation of 16 acquisition units. The final address allocation result is: the acquisition unit closest to the preprocessing module has an address of 4’b0000, and the farthest acquisition unit has an address of 4’b1111.

The rapid address allocation method of the underwater acoustic array system in the present invention adopts the FPGA hardware logic structure as shown in FIG. 4 . The hardware logical structure includes:

The command identification module 13 is used for identifying address allocation commands issued by the preprocessing module or the upper-level acquisition unit;

The address cache module 14 is used to cache the address code in the address allocation command;

The data integration and sending module 15 is used to integrate the data received from the lower-level acquisition unit with the address of the local acquisition unit, and send the integrated data frame to the upper-level acquisition unit or the preprocessing module;

The command sending module 16 is used to send an updated address assignment command to the lower-level acquisition unit;

Address+1 cache module 17, used to add 1 to the received address code and cache it;

Data receiving module 18, for receiving the data uploaded by the lower acquisition unit;

The local data module 19 is used for caching the data collected by the local collection unit.

The acquisition unit first identifies the received command, if it is an address allocation command, extracts the address code into the address cache for configuring the local address; at the same time, the acquisition unit adds 1 to the address code, and then The address code after adding 1 is updated to the address allocation command, and finally forwarded to the next-level acquisition unit. After a certain period of time, all the acquisition units can complete the configuration of their respective local addresses.

As shown in Figure 5, the data frame structure collected by each acquisition unit is composed of frame header, local acquisition unit address, local acquisition unit data and CRC check code, and the overall data frame structure of the underwater acoustic array system in the present invention is from the acquisition unit 1 to N are arranged in order, and the specific implementation process is: after the acquisition unit receives the local data, it frames the data and the local address, and transmits the local data frame first; at the same time, the acquisition unit receives the data uploaded by the next-level acquisition unit. For cascading data, store it first, and upload it after the local data completes the long transmission.

As shown in Figure 6, the time-consuming allocation of addresses for all acquisition units in the system is mainly divided into the following four steps:

Step 1: The control center on board sends an address assignment command to the preprocessing module, and the time required for this step is Tsend;

Step 2, the preprocessing module forwards the address allocation command to the first-level acquisition unit, and the time required for this step is Tresend;

Step 3, the collection units at all levels only need to complete the extraction and modification of the address code to realize the configuration of the local address, and the time required to complete this step is Tlocal;

Step 4, the address allocation command modified by the upper-level acquisition unit is forwarded to the lower-level, and the time required for this step is Ttrans;

So far, the time required to complete the address allocation of all acquisition units in the system is:

Ttotal=Tsend+Tresend+Tlocal+(N-1)×Ttrans;

In the present invention, since the underwater acoustic array system adopts a cascaded structure to upload data, if the acquisition unit 3 fails, the control center on board will not be able to receive all the data frames from the acquisition unit 3 to the acquisition unit N. Therefore, the control center on board can monitor the received data frames in real time, search for unreceived addresses and data, and quickly locate the fault.

Claims (2)

1. a kind of underwater sound array system with the quick distribution function in collecting unit address, is characterized in that, by pretreatment module, life Make line, data wire, collecting unit and underwater sound sensor five part, control centre passes through pretreatment module, via order wire, to Each collecting unit of subordinate sends address distribution order, and each collecting unit, after receiving this order, completes to local address Setting, and will process after address distribution order be forwarded to next stage；Address distribution order frame structure be divided into identification code and Address code.Wherein, identification code is used for distinguishing different down orders；Address code is used for arranging the address of each collecting unit, each Collecting unit Jia 1 after completing address distribution automatically, for the address distribution of next stage collecting unit.

2. there is the underwater sound array system of the quick distribution function in collecting unit address as claimed in claim 1, it is characterized in that,

Collecting unit is provided with FPGA hardware logical structure, and described FPGA hardware logical structure is included as lower module：

Command recognition module, the identification address distribution order issuing for pretreatment module or higher level's collecting unit；

Address caching module, for the address code in buffer address distribution order；

Data Integration and sending module, the data for receiving from subordinate's collecting unit is whole with the address of local collecting unit Close, and the Frame that superior collecting unit or pretreatment module transmission were integrated；

Order sending module, for sending the distribution order of the address after updating to subordinate's collecting unit；

Address+1 cache module, for adding 1 by the address code receiving and caching；

Data reception module, for receiving the data that subordinate's collecting unit uploads；

Local data module, for caching the data of local collecting unit collection.