RU41882U1 - HYDROACOUSTIC RESPONSIBLE BEACON SIGNAL SIMULATOR - Google Patents

Abstract

The device relates to the field of hydroacoustics and can be used to test the performance and assess the accuracy of the work of hydroacoustic stations (GAS) and the navigation systems that work with them when determining the coordinates of the vessel relative to a group of three beacon transponders (MO). The task of the device is to generate, at the request signal of the GAS, three radio pulses delayed relative to the request signal at fixed time intervals. To solve this problem, a well-known Doppler lag signal simulator containing an antenna, a first distance simulator, a noise shaper, a pulse shaper, a first pulse shaper, an adder, two modulators, two local oscillators, two amplifiers, a switch, a bandpass filter, a detector, a threshold device, the second and third distance simulators, the second and third pulse shapers, the third modulator, the third local oscillator, an analog switch and a trigger with corresponding connections.

Description

The inventive device relates to the field of hydroacoustics and can be used to monitor the operability of hydroacoustic stations (GAS), designed to determine the location of ships, submarines (PA) and submarines (PL) relative to the installed at the bottom of several (1-4) transponder beacons ( MO), the coordinates of which are known, as well as to assess the accuracy of determining the coordinates of the vessel relative to the MO in the process of sea tests during the transfer to the fleet of GAS and navigation systems (NK) during their joint work.

The principle of operation of a GAS is based on the emission of a request signal that is the same for all MOs, receiving response signals that differ in frequency ratings (to enable identification of received signals by a specific MO), measuring the propagation time of signals from the moment of radiation to the moment of receiving signals, and calculating the distances to each of the MOs. According to the data received from the GAS, as well as the known coordinates of the Moscow Region, the coordinates of the vessel are determined in the NK.

To control the GAS, after it emits a request signal, it is necessary to generate and emit a sequence of at least four radio pulses with different carrier frequencies equal to the response frequencies of the MO, one after the other with a known fixed delay. The accuracy of determining the distances to the MO can be estimated by comparing the measured GAS delay values between the moment of emission of the MO request signal and the moments of receiving response signals at given signal / noise ratios with the values of the fixed delays set in the simulator. Evaluation of the accuracy of the NK operation can be performed by assigning to each of the MOs whose signal is simulated, fixed coordinates established on the basis of fixed delays in the simulator. According to the data on measured and simulated delays received from the GAS in the Tax Code, the coordinates of the vessel relative to the MO are calculated and compared with the reference calculated based on known fixed delays.

Known simulators of reflected signals [6, 7], creating models of reflected signals that are close to real, allowing you to check the operability of hydro or radar in the operating range of distances to reflective surfaces with real signal-to-noise ratios. The main elements of a typical simulator are:

- a distance simulator generating a pulse delayed relative to the sonar probe pulse, and a signal for adjusting the transfer ratio of the voltage divider. Delayed forming

pulse and adjustment signal are set proportional to the simulated distance;

- a frequency-controlled local oscillator (hereinafter referred to as a local oscillator), which forms the frequency of the reflected signal, which depends on the Doppler effect, i.e. from the speed of movement of the sonar carrier;

- a pulse shaper that generates the duration of the reflected signal, which varies depending on the distance to the reflecting surface;

- a modulator forming a reflected radio pulse;

- a voltage divider designed to simulate attenuation of a signal with distance;

- jammer, creating a noise voltage, close in spectrum and nature to real noise;

- adder designed to add interference voltages and simulated reflected signal.

The closest set of features to the proposed utility model is the "Simulator of reflected hydroacoustic signals of the Doppler lag", a description of which is given in [6]. The prototype device includes elements common with the claimed device: antenna, distance simulator, noise shaper, pulse shaper, adder, two modulators, two local oscillators.

The disadvantage of the prototype device is the inability to receive request signals from the GAS and the formation of several response signals with fixed delays between them.

The objective of the invention is to remedy this drawback with the aim of creating a simulator of signals of the MO group, which allows to significantly simplify the method of checking the accuracy of HAS and NK in marine conditions during the delivery of these products to the fleet. At present, to assess the accuracy of the ND when working together with the GAS when determining the coordinates of the vessel relative to the MO, it is necessary to equip the landfill with at least three MOs installed at the vertices of an imaginary triangle. The distance between MO is from 2 to 5 km. The coordinates of the vessels and vessels installed at the bottom of the sea should be determined with an error of not more than 2-3 m, which in the open sea is a very difficult and sometimes impossible task. During the test period, the sound velocity distribution over the depth must be measured and the geometrical ranges of action calculated (depending on the depth location of the MO and PA), within which the specified accuracy of determining the distances to the MO is ensured. Landfill equipment, depending on weather conditions and used to determine the coordinates of navigation equipment, can take several days. Limited service life of modern domestic MOs used for navigating PA (no more than 2 weeks), and the possibility of testing GAS and NK with sea waves no more

1-2 points, extremely complicate the organization and conduct of tests. Thus, the surrender of the GAS and NK to the PA turns into a research project, which takes a lot of time, effort and money. The proposed simulator allows you to evaluate the accuracy of the GAS and NK without the use of MO and navigation support, without going to sea - at the wall in the harbor. It does not require the determination in real conditions of the coordinates of the MO and the vessel. The antenna of the simulator is located in the water near the HAS antenna, the levels of signals and interference emitted by the simulator are set based on the maximum signal / noise ratio, at which the accuracy of the HAS and NK is guaranteed. For multiple request-response cycles, errors in measuring the delays in the arrival of GAS response signals and vessel coordinates using the ND are determined.

The essence of the claimed device is that in a device containing an antenna, a first distance simulator, an interference driver, a first pulse generator, an adder, two modulators, two local oscillators, the first distance simulator, a first pulse generator, a first modulator and an adder connected in series, the second the input of the first modulator is connected to the output of the first local oscillator, the second local oscillator, the second modulator and the adder are connected in series, the output of the jammer is connected to the third input of the adder, OFF STARTING OUT by the fact that two amplifiers are introduced into it, a switch, a bandpass filter, a detector, a threshold device, a second and third distance simulators, a second and third pulse shaper, a third modulator, a third local oscillator, an analog switch and a trigger, with an antenna, a switch, a first amplifier , the band-pass filter, the detector and the threshold device are connected in series, the second input of the switch is connected to the output of the second amplifier, the output of the threshold device is connected simultaneously with the first input of the trigger and with the inputs of all three simulations distance, outputs of the second and third distance simulators are connected respectively to the inputs of the pulse shapers of the same name, the outputs of which are connected to the second inputs of the modulators, respectively, the output of the third local oscillator is connected to the first input of the same name modulator, the output of which is connected to the fourth input of the adder, the output of the adder is connected to the first input an analog switch, the output of which is connected to the input of the second amplifier, the output of the third pulse shaper is connected to the second input of the trigger, the output to It is connected to the second input of an analog key.

The structure of the claimed device is shown in figure 1, where the following notation is introduced:

- antenna - 1;

- the first, second and third distance simulators - 2, 16 and 17;

- jammer - 3;

- first, second and third pulse shaper - 4, 18 and 19;

- adder - 5;

- the first, second and third modulators - 6, 7 and 20;

- the first, second and third local oscillators - 8, 9, and 21;

- first, second amplifiers - 10, 11;

- switch - 12;

- band-pass filter - 13;

-detector - 14;

- threshold device - 15;

- an analog key - 22;

- trigger - 23.

The output of block 1 is connected to the input of block 12, the output of block 12 is connected to the input of block 10, the output of block 10 is connected to the input of block 13, the output of block 13 is connected to the input of block 14, the output of block 14 is connected to the input of block 15, the output of block 15 is connected to the inputs of blocks 2, 16, 17, 23, the outputs of blocks 2, 16, 17 are connected respectively to the inputs of blocks 4, 18, 19, the outputs of blocks 4, 18, 19 are connected respectively with the first inputs of blocks 6, 7, 20, the outputs of blocks 8 , 9, 21 are connected respectively with the second inputs of blocks 6, 7, 20, the outputs of blocks 6, 7, 20 are connected with 1, 2, 4 inputs of block 5, respectively One block 3 is connected to the 3 input of block 5, the output of block 5 is connected to the first input of block 22, the output of block 22 is connected to the input of block 11, the output of block 11 is connected to the input of block 12, the output of block 23 is connected to the second input of block 22, the output of the block 19 is connected to the second input of block 23.

The following elements or their analogs can be used as components of the simulator:

- antenna - electrical converter [1, p. 154-202, 252];

- distance simulator and pulse shaper — a standard measuring pulse generator of the G5-56 type [2, p. 180], having an external trigger, generating a video pulse, the duration and delay of which relative to the external trigger pulse can vary.

- jammer - a standard measuring generator of noise signals of the type G2-59, G2-57, etc. [2, p. 162];

- adder - 4 resistors, one of the same outputs of which are connected together and are the output, and the rest are inputs;

- modulator - circuit "And" [3, p. 177];

- local oscillator - measuring generator type G3-110 [2, p. 163];

- the first amplifier is an amplifier [4, p. 73-88], the second - [4, p. 30-49];

- switch - relay RES-22 RF4.500.131 with a button KMD2-1 in ОУ0.360.011 TU, or a contactless diode receive-transmit switch, in which the signal from block 11 to block 1 enters through the antiparallel diode circuit, and from block 1 to the block

10 - through a resistor, the output of which, connected to block 10, is connected through an antiparallel diode circuit with the offending (zero) wire of block 10;

- band-pass filter - filter [3, p. 107];

- detector - [3, p. 146];

- threshold device - a single-stable multivibrator [3, p. 259] or Schmitt trigger [3, p. 260];

- analog key - [5, p. 447];

- trigger - 564TM2 chip bK0.347.064 TU. The inventive device operates as follows, see figure 2. The tested GAS emits a request signal MO, which usually consists of two pulses with different carrier frequencies of filling. The first pulse of long duration provides noise immunity of reception, and the second short pulse records the moment of reception of the signal.

The request signal is received by the antenna 1 of the simulator, through the switch 12 is supplied to the amplifier 10 (U ₁ , U ₁₀ ). The second filter pulse of the request (U ₁₃ ) is allocated by the band-pass filter 13, detected (U ₁₄ ) and registered by the threshold device (U ₁₅ ). The leading edge of the pulse (U ₁₅ ) triggers three distance simulators - 2, 16, 17 and trigger 23. The voltage drop from the trigger opens the analog switch 22, through which, the amplifier 11 and switch 12 to the antenna 1 receives the interference voltage. Distance simulators 2, 16, 17 generate pulses delayed for a time (t ₁ , t ₂ , t ₃ ) (U ₂ , U ₁₆ , U ₁₇ ), triggering pulse shapers 4, 18, 19 (U ₄ , U ₁₈ , U ₁₉ ). Modulators 6, 7, 20, upon receipt of signals from the local oscillators 8, 9, 21 and from the shapers 4, 18, 19, generate radio pulses (U ₄ , U ₁₈ , U ₁₉ ), which through the adder 5 (U ₅ ) enter the antenna 1 and are emitted into the water.

From the above description it follows that the claimed device solves the task of simulating the response signals of the MO group, which allows you to evaluate the accuracy of the GAS NK without using the MO.

Sources of information

1 L.V. Orlov, A.A.Shabrov "Calculation and design of antennas of hydroacoustic fish-searching stations", M., Food industry, 1974

2 Catalog of products of the communications equipment industry "89 Radio metering devices, series 1, Central branch of the STI" Eco ", M., 1988

3 M. Mandl "200 selected electronics circuits", M., "Mir", 1980

4 "Aperiodic amplifiers on semiconductor devices" Design and Calculation, M., Soviet Radio, 1968

5 "Digital and analog integrated circuits", Handbook, M., Radio and communications, 1990

6 Certificate for utility model "Simulator of reflected hydroacoustic signals of the Doppler lag" RU 27714 U 1.

7 A.S. Kolichedantsev "Hydroacoustic stations", L., "Shipbuilding", 1982 (p. 175-180).

Claims (1)

A signal simulator of hydroacoustic transponder beacons (MO), comprising an antenna, a first distance simulator, a noise shaper, a first pulse shaper, an adder, two modulators, two local oscillators, the first distance simulator, a first pulse shaper, a first modulator and a adder connected in series, the second input the first modulator is connected to the output of the first local oscillator, the second local oscillator, the second modulator and the adder are connected in series, the output of the jammer is connected to the third input of the adder, I distinguish which consists of two amplifiers, a switch, a bandpass filter, a detector, a threshold device, a second and third distance simulators, a second and third pulse shaper, a third modulator, a third local oscillator, an analog switch and a trigger, with an antenna, a switch, a first amplifier , the bandpass filter, the detector and the threshold device are connected in series, the second input of the switch is connected to the output of the second amplifier, the output of the threshold device is connected simultaneously with the first input of the trigger and with the inputs of all three simulators the distances, the outputs of the second and third distance simulators are connected respectively to the inputs of the pulse shapers of the same name, the outputs of which are connected to the second inputs of the modulators, respectively, the output of the third local oscillator is connected to the first input of the same name modulator, the output of which is connected to the fourth input of the adder, the output of the adder is connected to the first input of the analog key, the output of which is connected to the input of the second amplifier, the output of the third pulse former is connected to the second input of the trigger, the output of which oh connected to the second input of the analog key.