RU82357U1 - HYDROACOUSTIC HIGH FREQUENCY MULTI-BEAM SOFTWARE AND TECHNICAL COMPLEX FOR ACCOUNTING VALUABLE VALUABLE FISH SPECIES OF "NETCOR-3" - Google Patents

Abstract

Hydroacoustic high-frequency software and hardware complex for estimating the number and direction of movement (in gradations up and downstream) of valuable species of fish passing through the observed river section, characterized in that it includes a network of independent anchored floating sonar recorders with program-controlled generator-receiver loaded on a serial high-frequency (455 kHz) multi-element antenna, an analog-to-digital converter, a microcontroller and a packet data transmission device for diochannel in the unlicensed range of radio frequencies to the on-shore computerized instrumentation system.

Description

Utility Model Name

“Hydroacoustic high-frequency multipath software and hardware complex for recording valuable species of fish“ NetCor-3 ”

Technical field

A quantitative assessment of stocks of valuable fish in rivers in shallow waters with the aim of regulating fishing, a means of assessing possible environmental damage during the design, construction and operation of various crossings (pipelines, cables, bridges, etc.) through rivers with valuable fish populations.

State of the art

The prior art is illustrated by the following solutions:

1. USSR author's certificate No. 1242083, 1985. A device for the selective counting of fish in a stream of water, having a hydroacoustic antenna. A single-channel decision of the transceiver path narrows the area of the accounting zone.

2. USSR author's certificate No. 352431, 1972, a device for counting fish, having several sonar transducers with amplifiers, a selector unit and detectors. Rigid mounting of the surface and bottom antennas was provided, which excluded the possibility of using the device at an arbitrary point in the reservoir. In addition, the number of channels in the selector block was equal to the estimated number of fish swimming in parallel, which made the device obviously not universal.

3. Yakovlev S. G., Putivkin S. V. Fish registration system for salmon farming. “Fisheries and fisheries”, No. 1, 2002, pp. 52-53. The article provides a description of single-frequency sonar fish-counting devices RSU-1 and

DCS-2, providing for the use of a set of sonar antennas for scanning a river section and counting passing fish. Only the bottom arrangement of antennas is provided.

4. RF patent for utility model No. 52647 “Hydroacoustic software and hardware system for recording valuable species of fish“ NetCor-1 ”passing for spawning. The author is A. Degetv, the patent holder is the Industrial Hydroacoustics Limited Liability Company (PromHydroacoustics LLC). The product provides a vertical location model, has a limited registration area.

5. RF patent for utility model No. 73747 “Hydroacoustic high-frequency multipath software and hardware system for recording valuable species of fish“ NetCor-2 ”passing for spawning. The author is A. Degetv, the patent holder is the Industrial Hydroacoustics Limited Liability Company (PromHydroacoustics LLC). The product provides control and data transmission via signal cables.

The systems indicated in clauses 1–3 did not have a software component and did not take into account the peculiarities of hydroacoustic recording of single objects that are typical for such a class of problems, known as registering group targets by spaced measuring systems. Such features include the possibility of multiple registration of one target with the same meter and the possibility of multiple registration of the same target with different meters, which can lead to a systematic bias in the quantitative estimates of the number of fish passing through the scanned section of the river. The system specified in paragraph 4 could not be used in shallow water (with a depth of place of up to 1 meter). The system specified in clause 5 provides for the management and transmission of data via signal cables.

Disclosure of useful technology

The main purpose of the NetCor-3 complex is a quantitative assessment of passing fish through a scanned river section in shallow water with the possibility of restoring the distribution of target strength of recorded single fish and determining the direction of their movement in gradations up and downstream. In utility model

scanning of the river cross-section according to the horizontal location scheme using a network of high-frequency multipath hydroacoustic stations is provided. Tasks solved by the model:

- selection of single and group targets that have passed through a scanned section of the river;

- echo counting of single fish passing through a scanned section of the river;

- integration of the echo from group targets to estimate the number of fish in them;

- determination of the direction of movement of targets in gradations down or upstream;

- determination of spatial and temporal characteristics of the distribution of the flow of rising fish;

- an objective and methodically correct interpretation of recorded single and group targets in the number of fish passing through the river section during the observation period.

The system consists of a Master device and a network of Slave devices. Management of the system, the collection, storage and processing of data is carried out by a coastal computerized control and measuring system (device "Master") using specialized software. The Slave device consists of a software-controlled high-frequency generator-receiver loaded on a serial high-frequency (455 KHz) multi-element antenna, an analog amplifier of the receiving path, an analog-to-digital converter, a microcontroller, a packet data transmission device over the air in the unlicensed range of radio frequencies, and a floating platform with a battery and a swivel-mountable device for attaching a sonar antenna. The scanning mode of the river section is determined by program-defined parameters:

- the frequency of the generator;

- the pulse duration of the generator;

- a sequence of polling network elements from Slave devices.

Radio transmission is carried out in the unlicensed 2.4 GHz ISM radio frequency range using nanoNET transceivers (IEEE 802.15.4a standard). Key features of the NetCor complex:

- operating frequency 455 KHz;

- electric power on the antenna 40-80 W;

- parcel repetition rate - up to 12 Hz;

- the width of the directivity characteristics of one beam at the level of -6 dB 10 degrees, the width of the multipath sector at one station up to 80 degrees in the plane of the fan of the rays;

- in horizontal mode, registration of fish is ensured with a depth of up to 1 meter;

- the maximum detection range in horizontal mode of a single fish with a target strength of -50 dB is 20 meters;

- minimum registration range - 0.5 meters;

- distance of stable radio communication - up to 200 m, distance of limiting radio communication - up to 600 m (depending on the level of interference and antennas used);

- the number of floating hydroacoustic high-frequency multipath stations in the network (Slave devices) - up to 16;

- the software of the system consists of a program for managing the complex and collecting data from a network of floating sonar stations in real time and a program for off-line data processing in delayed time on x86 platform computers running Windows.

The use of serial high-frequency multipath hydroacoustic antennas allows using the horizontal scanning model in shallow water conditions, while having a fairly wide detection zone (in the experimental sample, up to 80 degrees at a level of -10 dB in the plane of the fan of rays). The proposed scheme allows one to correctly interpret some of the features of hydroacoustic registration of single objects that are characteristic of this class of problems, known as registration of group targets by spaced measuring systems. Such features include the possibility of multiple registration of one target with the same meter and the possibility of multiple registration of the same target with different meters.

According to the capabilities of hydroacoustic registration of passing fish, the NetCor-2 and NetCor-3 complexes are almost identical, but differ in the way they transmit control signals and data. A cable connection is used for the NetCor-2 complex and packet transmission over the air for the NetCor-3 complex.

Utility Model Implementation

The rational use of renewable biological resources implies the limitation of fishing, which requires effective and renewable knowledge about the state of stock of the exploited resource. The existing scheme for quantifying the status of the stock of migratory fish in rivers is based (mainly) on the analysis of commercial seizure and population structure according to control fishing data. The reliability of the fishing statistics in Russia is low, especially in the conditions of developing market relations, the results of control fishing, which are, in fact, the data of sample studies, are often fragmented and unrepresentative due to the limited resources allocated. In the community of experts assessing fish stocks and regulating their fishing, there is growing interest in the development and implementation of instrumental, including hydroacoustic, methods in the practice of quantitative assessments of aquatic biological resources.

In 2007-2008, the hydroacoustic high-frequency multipath software and hardware complex for recording valuable spawning fish species NetCor-3 was used in experimental work on the Onega and Severnaya Dvina rivers (Arkhangelsk Region), Ukhtolok (Kamchatka), Irtysh (Tyumen Region) .), Ponoy (Murmansk region) which showed stable registration of moving fish in the zone of operation of the device, with the possibility of restoring the number of fish that passed, distributing the target strength (size) and direction of movement of the registered fish.

The Appendix in Figure 1 shows a photograph of the Master device, Figure 2 shows a photograph of a set of three units of Slave devices, Figure 3 shows a typical echogram of sonar recording of passing fish by the NetCor-3 complex.

Claims (1)

Hydroacoustic high-frequency software and hardware complex for estimating the number and direction of movement (in gradations up and downstream) of valuable species of fish passing through the observed river section, characterized in that it includes a network of independent anchored floating sonar recorders with program-controlled generator-receiver loaded on a serial high-frequency (455 kHz) multi-element antenna, an analog-to-digital converter, a microcontroller and a packet data transmission device for diochannel in the unlicensed range of radio frequencies to the on-shore computerized instrumentation system.