RU220462U1 - Autonomous depth correction device for precision sounding echo sounders - Google Patents

Abstract

The utility model relates to the field of hydroacoustic technology and can be used in precision sounding echo sounders installed on ships. The purpose of the utility model is to dispense with the VRSZ meter or a lowered disposable device for indirect measurement of the VRSZ (determining temperature, salinity (electrical conductivity) and pressure of sea water with CTD probes, refusing to communicate with operational oceanology data. The technical result is to simplify the device for determining the average value of the speed of sound of precision measuring echo sounders and reducing its cost.To achieve the stated technical result, new features have been introduced into the autonomous device for correcting the depth of precision measuring echo sounders, containing input and output interface blocks, namely - blocks for calculating the number of the World Ocean region (MO), samples from MO area tables, MO area tables, depth correction calculations, selections from the depth correction table, depth correction table and algebraic summation.

Description

The utility model relates to the field of hydroacoustic technology and can be used in precision measuring echo sounders installed on ships.

Determination of depth when carrying out sounding work with an echo sounder is carried out according to the well-known expression

,

where Z is depth;

C is the value of the speed of propagation of the sound signal;

T is the propagation time of the sound signal to the bottom and back, measured by an echo sounder. It is also known that in marine or oceanic conditions, the speed of the sound signal along the propagation path changes and depends on the area where the measuring work is carried out. Navigation echo sounder equipment uses a standard sound speed value of 1500 m/s in (1), for example, [Khrebtov A.A. and others. Ship echo sounders // L.: Shipbuilding. - 1982. - T. 232].

In precision measuring echo sounders in (1), it is recommended to use the average value of sound speed in the area where the measuring work is carried out. The average value is determined from the vertical distribution of sound speed (VSD) in the area. There are known devices that determine the average speed of sound in an area. The devices consist of a hydroacoustic VRSZ meter or calculation of VRSZ based on hydrological sounding data or operational oceanography data, and calculation of the average sound speed according to VRSZ data, for example, [Mikushin I.I., Seravin G.N. Methods and means for measuring the speed of sound at sea. - 2012, Komlyakov V.A. Shipborne means of measuring the speed of sound and modeling acoustic fields in the ocean. - 2003, Firsov Yu.G. Basics of hydroacoustics and the use of hydrographic sonars. - 2010, Pat. RF No. 217273 prior. 12/13/2022, publ. 03/24/2023 BI No. 9]. Examples of such devices are the “sound speed and temperature sensor” device of the PEL-200 measuring echo sounder, the VRSZ (Sound velocity profiler) hydroacoustic meter device of the Echotrac E20 echo sounder [www.teledynemarine.com/odom-hydrographic/], the device for determining the average value of sound speed of precision measuring echo sounders based on operational oceanography data [Pat. RF No. 217273...].

The fundamental disadvantage of these devices is the presence of a hydroacoustic VRSZ meter, a hydrological probe, as additional meters to the echo sounder, or receiving operational oceanology data via a communication channel, i.e. not the autonomy of the latest device.

The closest analogue to the proposed utility model is the device of the “sound speed and temperature sensor” of the PEL-200 measuring echo sounder.

The purpose of the utility model is to abandon the VRSZ meter or a lowered disposable device for indirect measurement of the VRSZ (determining temperature, salinity (electrical conductivity) and pressure of sea water with CTD probes, refusal to communicate with operational oceanography data.

The technical result is to simplify the device for determining the average value of sound speed of precision measuring echo sounders and reduce its cost.

To achieve the stated technical result, new features were introduced into the autonomous device for correcting the depth of precision sounding echo sounders, containing input and output interface blocks, namely, blocks for calculating the number of the World Ocean region (MO), samples from the table of MO regions, tables of MO regions were introduced into the device , depth correction calculation, sampling from the depth correction table, depth correction table and algebraic summation.

The stated problem in the claimed utility model is solved as follows.

In the claimed device, input interface blocks, calculation of the MO region number, sampling from the MO district table, MO district table, depth correction calculation, sampling from the depth correction table, depth correction table, algebraic summation and output interface, ensure the constructive isolation of the device.

The essence of the utility model is illustrated in Figures 1-3, where

Figure 1 shows a generalized functional diagram of the claimed device;

Figures 2 and 3 show, as illustrations, a VRSZ graph and a screenshot of the operation of a digital model of the device for a given measurement area.

The claimed device (Fig. 1) contains an input interface block 1, the input of which is connected to the command source of a precision sounder, and the first output of which is connected to the input of the block for calculating the number of the region MO 2, the output of which is connected to the first input of the sampling block from the table of regions MO 3 , the first output of which is connected to the input of the region table block MO 4, the output of which is connected to the second input of the sampling block from the region table MO 3, the second output of which is connected to the first input of the depth correction calculation block 5, the output of which is connected to the first input of the sampling block from the table depth correction 6, the first output of which is connected to the input of the depth correction table block 7, the output of which is connected to the second input of the sampling block from the depth correction table 6, the second output of which is connected to the first input of the algebraic summation block 8, the second input of which is connected to the second input of the block calculation of depth correction 5 and the second output of the input interface block 1, and the output of the algebraic summation block 8 is connected to the input of the output interface block 9. The connections of the input interface blocks 1 and output 9 with the precision sounder are not shown in Fig. 1.

The device blocks can be implemented on a multilayer printed circuit board no larger than 200×200 mm, on which electronic components (integrated circuits, individual resistors, capacitors, quartz resonators, connectors, etc.) are placed using assembly operations (gluing, joining, soldering). Those. Structural unity and implementation of the device for general functional purposes are ensured.

As an example, the following main chips can be used in the device. 5578TC024 programmable logic integrated circuit (FPGA) with built-in configuration for multiple reprogramming. The FPGA has a debug (technological) printed circuit board OP5578TS024.01. Production of microcircuits - JSC "Voronezh Plant of Semiconductor Devices - Assembly" [www.vzpp-s.ru]. To configure the FPGA device, a read-only memory chip (ROM) 5578PC015 produced by JSC KTC ELECTRONICS [www.edc-electronics.ru] can be used.

The proposed autonomous device for correcting the depth of precision sounding echo sounders works as follows.

Currently, in the absence of knowledge of the VRSZ and, accordingly, the average value of sound speed in the area of measurement work, books with correction tables are used. Examples of such publications [Tables of depth corrections measured by echo sounder. Issue 1. Section 1. Obninsk. - 1977, Tables for correcting depths measured by an echo sounder for deviation of the actual vertical sound speed from the calculated one. Main Directorate of Navigation and Oceanography of the USSR Ministry of Defense. - 1983]. The International Hydrographic Organization has also adopted tables [www.bodc.uk.gov]. The tables are applicable for precision sounding echo sounders when the standard sound speed value is set to 1500 m/s.

When power is supplied, as an example, the FPGA 5578TS024 is configured from the ROM 5578RS015. The input interface block expects a message from a command source of a precision sounding echo sounder via a protocol, for example, a universal asynchronous transceiver (UART), latitude, longitude data of the sounding area and depth from the echo sounder. When receiving a message from the input interface block, blocks for calculating the number of the Moscow region, samples from the table of Moscow regions, and tables of Moscow regions determine the number of the region. For example, the table of regions of the International Hydrographic Organization MO has a volume of 98048 bits. Based on the region number, depth correction calculation blocks, samples from the depth correction table, and depth correction tables determine the depth correction. For example, the depth correction table of the International Hydrographic Organization has a volume of 93008 bits, but the FPGA 5578TS024 has a built-in memory capacity of 368640 bits. The algebraic summation unit sums the depth correction with the depth from the echo sounder, and the output interface transmits the corrected depth value, for example, via the UART protocol, a precision sounder.

Figures 2 and 3 show, as illustrations, a VRSZ graph and a screenshot of the operation of a digital model of the device for a given area - the Black Sea, 44.2° N. w. and 36.3°E From the VRSZ graph it follows that the average vertical speed of sound is less than the standard speed value of 1500 m/s. The corrected depth value of 1431 m is less than the depth from the echo sounder of 1450 m.

The use of tabular data introduced into the claimed device allows without the use of a hydroacoustic meter VRSZ, or a hydrological probe, as additional meters to the echo sounder, or the use of operational oceanology data via a communication channel, i.e. not autonomous, significantly reduced the cost of the device and simplified its use.

This allows us to consider that the technical result has been achieved.

Claims (1)

Autonomous device for correcting the depth of precision sounding echo sounders, containing input and output interface blocks, characterized in that the device contains blocks for calculating the number of the World Ocean region (MO), samples from the table of MO regions, table of MO regions, calculation of depth correction, samples from the correction table depth, depth correction table and algebraic summation, wherein the input of the input interface block is connected to the source of commands of the precision measuring echo sounder, and the first output of which is connected to the input of the block for calculating the MO area number, the output of which is connected to the first input of the sampling block from the MO area table, the first the output of which is connected to the input of the MO region table block, the output of which is connected to the second input of the sampling block from the MO region table, the second output of which is connected to the first input of the depth correction calculation block, the output of which is connected to the first input of the sampling block from the depth correction table, the first output which is connected to the input of the depth correction table block, the output of which is connected to the second input of the sampling block from the depth correction table, the second output of which is connected to the first input of the algebraic summation block, the second input of which is connected to the second input of the depth correction calculation block and the second output of the input interface block , and the output of the algebraic summation block is connected to the input of the output interface block, and its output is connected to the command source of the precision sounder.