RU20389U1 - HYDROLOCATOR FOR DETECTION AND CLASSIFICATION OF LATER AND UNDERWATER TARGETS FOR LATER VEHICLES - Google Patents

Description

HYDROLOCATOR FOR DETECTION AND CLASSIFICATION OF LATER AND AQUATIC TARGETS FOR A LATERAL SHIP

The proposed utility model relates to the field of sonar technology and is intended to improve the sonar weaponry of surface ships in terms of active means.

Known sonars for surface ships (NK) with a receiving-emitting antenna, designed to search, detect and classify underwater and surface objects. Information on sonar in the composition of sonar for NK of various countries is given, for example, in JANES WEAPON SYSTEMS, 198788, p. 451, 597, 607 - 608, 610-611. For more up-to-date information, see the JANES 1999 catalog on the CD in the Janes Underwater Warfare System section.

The composition of these sonars includes:

- receiving and emitting acoustic antenna, designed to emit sounding signals in sonar modes and sound supply communication and signal reception in all operating modes;

a radiation path of sounding signals, including a master oscillator, power amplifiers and matching devices with an acoustic antenna;

a signal receiving path, including preamplifiers, spatio-temporal information processing devices;

- remote control and indication of received and processed signals.

Such sonars include, in particular, sonars as part of the AN / SQS-23 and AN / SQS-26 complexes (USA), which search for submarines and surface ships (see A. Prostakov, Hydroacoustic Fleet Aids. M: Military Publishing House, 1974, pp. 8 - 13).

The sonar in the AN / SQS-53 complex (USA), which is a modernization of the AN / SQS-26 complex, has a target classification mode.

IPC GOIS 15/02

56 / DEl 160 (U.S.A.). Its description is given, for example, in the JANES WEAPON SYSTEMS, 1999, section Janes Underwater Warfare System.

The complex’s sonar, designed to search, detect and classify submarines and surface ships, contains a telescoping acoustic cylindrical antenna, a radiation path including a master oscillator, power amplifiers and antenna matching devices, a receive path and a digital computer complex including devices for terminal processing of the receive path information and a control and display panel.

The acoustic antenna of the complex is designed to convert electrical signals coming into it from the radiation path in sonar mode into acoustic signals, and to convert the received acoustic signals of the operating modes into electrical signals that are fed to the reception path.

The radiation path is designed to generate probing sonar signals of the required power. The radiation path master generates tonal and complex sounding signals. The sound power level of the probing signals necessary for radiation is set using power amplifiers. The matching devices of the radiation path coordinate the output resistance of the power amplifiers and the resistance of the acoustic transducers of the antenna.

The reception path is designed to receive signals from an acoustic antenna, and their spatio-temporal processing. Pre-amplifiers of the receiving path amplify, filter, and analog-to-digital convert signals from an acoustic antenna. The digital computer complex (PPM) of the receiving path provides optimal spatial-temporal processing of the received echo signals.

The control and indication panel is designed for generating control signals, transmitting these signals to the radiation paths and receiving and displaying on the display devices hydroacoustic information processed in the receiving path.

The disadvantages of this sonar in the complex include the relative duration of the target classification procedure. The echo signal from the probe signal used to survey the space, as a rule, does not have information for the direct classification of the detected objects, and a decision on the class of the target can be made as the information accumulates during tracking for a sufficiently long period of time (several reception cycles).

The objective of the proposed utility model is to reduce the time and increase the efficiency of the classification of targets detected by sonar.

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an acoustic antenna, a digital computer system containing a master generator of the radiation path, a device for digital processing of information from the receiving path and a control and display panel connected to the radiation and reception paths, new features have been introduced, namely:

- a device for generating a classification sounding signal consisting of a master oscillator that generates a wide-band, noise-like signal and a multi-channel signal delay device, the input of which is connected to the output of the master oscillator.

- a device for digital processing of the echo signal of the classification sounding signal, consisting of a filter unit and a classification unit, while the filter unit, to the input of which the output of the spatially temporal processing device is connected, provides consistent filtering and compression of the signals, each of the filters emits echo signals with a certain Doppler frequency offset, and the whole set of filters provides the overlap of the entire range of Doppler target speeds, the classification unit includes a device for determining plerovskoy target speed and recognition device, to the device inputs determine the Doppler velocity of the target is connected outputs of the filter unit and its output connected to the detection device.

As a classification sounding signal, for example, a broadband noise-like signal can be used, which is described, in particular, in the book Theoretical Foundations of Radar edited by Ya.D. Shirman, ed. Soviet Radio, M, 1970, pp. 378-393.

The technical result from the use of the proposed utility model is the solution by the sonar of a surface ship of the assigned task without a significant increase in the hardware and cost of the complex.

List of figures and drawings

FIG. 1 is a structural diagram of the proposed sonar;

Figure 2 is a structural diagram of a master oscillator and a multi-channel device for generating directional radiation of a classification signal;

Fig. 3 is a structural diagram of a digital processing device for a received classification signal.

The proposed sonar is illustrated in the block diagrams shown in FIG. 1, 2 and 3.

Pa fig. 1 presents a structural diagram of the proposed sonar. The proposed utility model contains a multi-element acoustic antenna 1, a radiation path 2, including matching devices 5 and power amplifiers 6, a receiving path 3, including a multi-channel device for preliminary processing (amplification and filtering) of signals 7 and an analog-to-digital converter 8, a digital computer complex 4, including a master oscillator 10, a device for generating a classification signal and a multi-channel device for A of {m66

holders 11, a digital-to-analog converter 12, a digital signal processing device 13, consisting of spatio-temporal processing devices 14 and optimal processing of the probe signal 15, a digital processing of the classification signal 16 and a control and indication unit 9.

In FIG. 2 and 3 are structural diagrams of possible embodiments of a device for generating a classification signal and a multi-channel delay device (11 in FIG. 1) and a device for digitally processing an echo signal of a classification probe signal (in FIG. 1, devices 11 and 16, respectively).

The device for generating a classification signal and a multi-channel delay device (Fig. 2) consists of a master oscillator 17 and a multi-channel delay device 18 connected to it.

The device for digital processing of the echo signal of the classification sounding signal (Fig. 3) consists of a filter block 19, including a multi-channel convolution device 21 and a classification block, including a device for determining the Doppler velocity of the target 22 and a recognition device 23.

Thus, the technical implementation of the sonar according to the proposed utility model does not meet difficulties and is easily feasible.

The work of the proposed sonar is as follows.

Before switching on the radiation, its parameters are set, including the type and duration of the probing signal, radiation power, etc., after which the radiation-reception cycle is started. In this case, the master oscillator 10 generates a signal that is fed through a digital-to-analog converter 12 to power amplifiers 6, where it is amplified and fed through a matching device 5 to a receiving-emitting antenna 1. If there is a target, the echo signal reflected from it is received by the acoustic transducers of the antenna and converted into electrical signals supplied to the inputs of the pre-amplifiers of the receiving path 7. The signals amplified and filtered in the pre-amplifiers through an analog-to-digital converter 8 blunt the input of a digital signal processing device 12 of a digital computer complex (PCM) 4, where spatial-temporal processing algorithms are implemented: a spectral analysis of the input arrays is performed and a fan of directional characteristics is generated within the search sector (13), and optimal processing is performed in each spatial channel the probe signal used (14). Then arrays are formed for displaying on the indicator screens of the control panel and indication 9. The operator, having found the mark of the target on the indicator screen, fixes the mark with a marker and switches on the classification mode. In this case, immediately after the radiation of the probe signal of the detection mode generated by the master oscillator 10, radiation is directed towards the detected target of the classification signal generated by the device 11, and in the receiving mode, the device 16 is connected, the input signal of which comes from the space-time processing device 13 from the output of the spatial channel corresponding to the direction to the classified target.

As can be seen from FIG. 2 of the structural diagram, device 11 consists of the master oscillator itself, which is used to generate a classification probing signal, and a multi-channel delay device, which serves to branch the generated signal into the number of channels of the radiation path (in Fig. 2, the number of channels is k), which is involved in the formation directivity characteristics in the desired direction, while in each channel, a signal delay corresponding to the compensation of the curvature of the antenna surface for the formation of directivity characteristics. A possible embodiment of the master oscillator when using a noise-like phase-shifted signal as a classification sounding signal is given in the book Theoretical Foundations of Radar edited by Ya.D. Shirman, ed. Soviet Radio, M, 1970, pp. 378-382.

In FIG. 3 shows a possible embodiment of device 16. The proposed device consists of a filter unit and a classification unit, while the filter unit provides consistent filtering and compression of signals received at its input from a spatially temporal processing device, each of the filters emitting echo signals with a certain Doppler frequency offset , and the whole set of filters (p) provides the overlap of the entire range of Doppler target velocities, and the classification unit, including the device for determining d the Oplerian speed of the target and the recognition machine, selects the necessary information, takes a decision on the class of the target and issues it to the operator. The principle of operation and the construction of the recognition automaton are given, for example, in the book of A.N. Yakovleva and G.P. Kablova Short-range sonar publishing house Sudostroenie, L, 1983, pp. 115-136.

In the proposed sonar, the classification process is significantly accelerated by irradiating the classified target while maintaining the detection mode with a special probing signal with a high resolution in frequency and time, and therefore its echo signal has the information necessary for classification (Doppler speed, acoustic extent, amplitude structure) . A classification signal is generated at the end of the radiation of the search probing signal and is emitted only in the direction of the classified target. As a classification sounding signal, one can use, as noted above, a broadband, noise-like signal, described, in particular, in the book Theoretical Foundations of Radar edited by Ya.D. Shirman, ed. Soviet Radio, M, 1970, pp. 378-393.

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Claims (3)

1. A sonar for detecting and classifying underwater and surface targets for surface ships, comprising a multi-element acoustic antenna, multi-channel emission and reception paths connected to an acoustic antenna, a digital computer system comprising a master oscillator connected to a radiation path, a digital echo processing device connected to the output of the receiving path and a display and control panel, characterized in that the device also includes digital signal processing devices the formation of a classification sounding signal connected to the input of the radiation path parallel to the master oscillator, and a device for digital processing and classification of the echo signal of the classification sounding signal, the input of which is connected to the output of the spatially temporal processing device of the digital processing of echo signals.  2. The sonar detection and classification of underwater and surface targets for surface ships according to claim 1, characterized in that the device for generating a classification sounding signal is made up of a master oscillator generating a broadband noise-like signal and a multi-channel signal delay device, the input of which is connected to the output of the master oscillator . 3. The sonar detection and classification of underwater and surface targets for surface ships according to claim 1, characterized in that the device for digital processing of the echo signal of the classification sounding signal consists of a filter unit and a classification unit, while the filter unit, the input of which is connected to the spatially temporal device output processing, provides a consistent filtering and compression of signals, and each of the filters emits echo signals with a certain Doppler frequency offset, and the whole set of filters provides overlap the whole range of the Doppler velocities purposes the labeling unit includes a device for determining the Doppler velocity and target recognition apparatus, to the device inputs determine the Doppler velocity of the target is connected outputs of the filter unit and its output connected to the detection device.