RU2484498C1 - Group target recognition method and apparatus for realising said method - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: method involves emission of electromagnetic energy towards a target and receiving signals reflected from the target, performing narrow-band filtration of component frequencies of the Doppler spectrum of the reflected signal, measuring Doppler frequency Δf_i of each spectrum component of the reflected signal according to the filter number, determining angular coordinates Δφ_i of each spectrum component of the reflected signal, determining characteristic velocity of each shining point on the detected target using the expression $$V_i=\frac{\Delta f_i\lambda }{2\cos \Delta {\phi }_i},$$

where λ is the wavelength of the emitted signal, comparing the obtained characteristic velocity values of each shinning point in accordance with the expression ΔV_i=|V_i-V_i+1|, if ΔV_i≥U, where U is a threshold value, the signals belong to one target; further determination of a group target based on comparing the obtained characteristic velocity values of each shining point in accordance with the expression ΔV_i=|V_i-V_i+1|, wherein if ΔV_i≥U₁, where U₁ is a threshold value, the signals belong to a group target.

EFFECT: higher information value.

2 cl, 1 dwg

Description

The invention relates to systems for detecting objects by reflection of radio waves from its surface and can be used in radar for target recognition.

A known recognition method, which consists in the emission towards the target of electromagnetic energy, the reception of signals reflected from the target, target recognition by the received image of geometric dimensions and configuration [US Patent No. 3978480, cl. G01S 9/00, 1974].

A device for recognizing a target is known, comprising a series-connected antenna, a radar station (radar), a frequency analyzer, a comparator and a first indicator, a first memory device (memory) of standards, the output of which is connected to the second input of the first comparison device, the second indicator, the input of which is connected with the output of the radar, sequentially connected to the second memory of the standards, the second comparison device and the third indicator, and the second input of the second comparison device is connected to the output of P Drugs [Nebabin V.G., Sergeev V.V. Methods and techniques of radar recognition. - M .: Radio and communications, 1984, p.30].

The disadvantages of the data of the method and device is the inability to recognize signals belonging to one target.

где λ - длина волны излучаемого сигнала, сравнивают полученные значения собственной скорости движения каждой точки из выражения ΔV_i=|V_i-V_i+1|, при ΔV_i≤U, где U - пороговое значение, принимают решение о принадлежности сигналов одной цели [Винокуров В.И., Винокуров Д.В., патент РФ на изобретение №2410715].Closest to the invention is a method for recognizing signals belonging to a single target, based on the emission of electromagnetic energy towards the target and receiving signals reflected from the target, performing narrow-band filtering of the Doppler frequency components of the reflected signal spectrum, measuring the Doppler frequency Δf _{i of} each component of the reflected signal spectrum by number filter, determining the angular coordinates Δφ _i of each component of the spectrum of the reflected signal, determining its own speed of movement of each point of you PICTURE $$V_i=\frac{\Delta {\mathrm{<figure-callout\; id="2"\; label="f\; i\; \lambda "\; filenames="00000007.png"\; state="\{\{state\}\}">f\; </figure-callout>}}_i\lambda }{2\cos \Delta {\phi }_i},$$

where λ is the wavelength of the emitted signal, comparing the obtained values of the proper speed of each point from the expression ΔV _i = | V _i -V _{i + 1} |, when ΔV _i ≤U, where U is the threshold value, decide on whether the signals belong to one target [Vinokurov V.I., Vinokurov D.V., RF patent for invention No. 2410715].

Closest to the invention is a device for recognizing signals belonging to one target, containing a series-connected antenna, radar, frequency analyzer, as well as n blocks of measurement of angular coordinates, a computer and an indicator, each block measuring angular coordinates contains a series-connected amplitude detector, error signal amplifier and an error signal detector, the outputs of the frequency analyzer are connected to the inputs of the blocks for measuring angular coordinates, the outputs of which are connected to the inputs of the calculator I, whose output is connected to the indicator input [V. Vinokurov, D. V. Vinokurov RF patent for the invention No. 2410715].

The disadvantage of this method and device is the inability to recognize the target in the class single or group.

An object of the invention is to expand the information content by recognizing the target in the class of single or group.

где λ - длина волны излучаемого сигнала, сравнении полученных значений собственной скорости движения каждой блестящей точки в соответствии с выражением ΔV_i=|V_i-V_i+1|, при этом в случае ΔV_i≤U, где U - пороговое значение, принимают решение о принадлежности сигналов одной цели, дополнительно определяют групповую цель на основе сравнения полученных значений собственной скорости движения каждой блестящей точки в соответствии с выражением ΔV_i=|V_i-V_i+1|, при этом в случае если ΔV_i≥U₁, где U₁ - пороговое значение, принимают решение о принадлежности сигналов групповой цели.The invention is achieved in that in a method for recognizing a group target, which consists in emitting electromagnetic energy towards the target and receiving signals reflected from the target, performing narrow-band filtering of the Doppler frequency components of the reflected signal spectrum, measuring the Doppler frequencies Δf _i , each component of the reflected signal spectrum by number filter, determining the angular coordinates Δφ _i ; each component of the spectrum of the reflected signal, determining the intrinsic speed of each brilliant point of the recognized target in accordance with the expression $$V_i=\frac{\Delta {\mathrm{<figure-callout\; id="2"\; label="f\; i\; \lambda "\; filenames="00000007.png"\; state="\{\{state\}\}">f\; </figure-callout>}}_i\lambda }{2\cos \Delta {\phi }_i},$$

where λ is the wavelength of the emitted signal, comparing the obtained values of the intrinsic speed of each shiny point in accordance with the expression ΔV _i = | V _i -V _{i + 1} |, while in the case ΔV _i ≤U, where U is the threshold value, take the decision on whether the signals belong to the same target, additionally determine the group goal based on the comparison of the obtained values of the proper speed of each brilliant point in accordance with the expression ΔV _i = | V _i -V _{i + 1} |, in this case, if ΔV _i ≥U ₁ , where U ₁ - threshold, decide with accessories latter is present multiple target.

где λ - длина волны излучаемого сигнала, сравнивают полученные значения собственной скорости движения каждой блестящей точки в соответствии с выражением ΔV_i=|V_i-V_i+1|, при ΔV_i≤U, где U - пороговое значение, принимают решение о принадлежности сигналов одной цели, дополнительно в вычислителе определяют групповую цель на основе сравнении значений собственной скорости движения каждой блестящей точки ΔV_i=|V_i-V_i+1| с пороговым значением U₁, при этом в случае ΔV_i≥U₁, принимают решение о принадлежности сигналов групповой цели.The method is implemented in a group target recognition device containing a series-connected antenna, radar and frequency analyzer, as well as n blocks of angular coordinates measurement, a calculator and a target indicator, each block of angular coordinates measuring comprising a series-connected amplitude detector, error signal amplifier and error signal detector the outputs of the frequency analyzer are connected to the inputs of the blocks of measurement of angular coordinates, the outputs of which are connected to the inputs of the computer, the output of which is connected to the input m indicator, while in the calculator determine the own speed of each shiny point of a recognized target from the expression $$V_i=\frac{\Delta {\mathrm{<figure-callout\; id="2"\; label="f\; i\; \lambda "\; filenames="00000007.png"\; state="\{\{state\}\}">f\; </figure-callout>}}_i\lambda }{2\cos \Delta {\phi }_i},$$

where λ is the wavelength of the emitted signal, the obtained values of the intrinsic speed of each brilliant point are compared in accordance with the expression ΔV _i = | V _i -V _{i + 1} |, when ΔV _i ≤U, where U is the threshold value, a decision is made on whether signals of one target, in addition, in the calculator, a group target is determined based on a comparison of the intrinsic speed of each shiny point ΔV _i = | V _i -V _i +1 | with a threshold value of U ₁ , and in the case of ΔV _i ≥U ₁ , a decision is made on whether the signals of the group target belong.

The drawing shows a functional diagram of a device for recognizing signals belonging to one target, where 1 is the antenna; 2 - radar; 3 - frequency analyzer; 4 - block measuring angular coordinates; 5 - calculator; 6 - target indicator, 7 - amplitude detector; 8 - error signal amplifier; 9 - error signal detector.

The group target recognition device contains a series-connected antenna 1, radar 2, as well as a frequency analyzer 3, n blocks 4 measuring the angular coordinates, a calculator 5, indicator 6, and each block 4 measuring the angular coordinates contains a series-connected amplitude detector 7, an error signal amplifier 8 and an error signal detector 9, the outputs of the frequency analyzer 3 are connected to the inputs of the blocks 4 for measuring angular coordinates, the outputs of which are connected to the inputs of the calculator 5, the output of which is connected to the input of the indicator 6.

где λ - длина волны излучаемого сигнала, сравнение полученных значений собственной скорости движения каждой блестящей точки из выражения ΔV_i=|V_i-V_i+1|, при ΔV_i≤U, где U - пороговое значение, принимают решение о принадлежности сигналов одиночной цели.The group target recognition device operates as follows. The signal reflected from the moving target is fed to the input of the antenna 1 and, through the radar 2, is fed to the input of the frequency analyzer 3, where the signal is filtered through n narrow-band channels. The signals from the outputs of each filter channel are fed to the inputs of the blocks 4 for measuring the angular coordinates, where the angular coordinates of the signal from each filter channel are measured. The signals from the outputs of blocks 4 measuring the angular coordinates are supplied to the calculator 5, where the determination of the intrinsic speed of each shiny point from the expression $$V_i=\frac{\Delta {\mathrm{<figure-callout\; id="2"\; label="f\; i\; \lambda "\; filenames="00000007.png"\; state="\{\{state\}\}">f\; </figure-callout>}}_i\lambda }{2\cos \Delta {\phi }_i},$$

where λ is the wavelength of the emitted signal, comparing the obtained values of the intrinsic speed of each brilliant point from the expression ΔV _i = | V _i -V _i +1 |, at ΔV _i ≤U, where U is the threshold value, they decide on whether the signals belong to a single goals.

If ΔV _i ≥U ₁ , where U ₁ is the threshold value, a decision is made on whether the signals of the group target belong.

The signals from the output of the calculator 5 are fed to the input of the indicator 6, which displays information about the belonging of the signals of a single or group target.

Claims (2)

1. A method for recognizing a group target, which consists in emitting electromagnetic energy towards the target and receiving signals reflected from the target, performing narrow-band filtering of the Doppler components of the reflected signal spectrum, measuring the Doppler frequencies Δf _{i of} each component of the reflected signal spectrum by the filter number, determining the angular coordinates Δφ _i each component of the spectrum of the reflected signal, determining the intrinsic speed of each brilliant point of the recognized target in accordance with the expression
$$V_i=\frac{\Delta f_i\lambda }{2\cos \Delta {\varphi }_i}$$

,
where λ is the wavelength of the emitted signal, comparing the obtained values of the intrinsic speed of each shiny point in accordance with the expression ΔV _i = | V _i -V _{i + 1} |, while in the case ΔV _i ≤U, where U is the threshold value, make a decision on the belonging of the signals of one target, characterized in that they determine the group target based on the comparison of the obtained values of the proper speed of each brilliant point in accordance with the expression ΔV _i = | V _i -V _{i + 1} |, in this case, if ΔV _i ≥U _1, where U ₁ - threshold, decide to belong values of the group of the target signals. 2. The group target recognition device contains a series-connected antenna, radar and frequency analyzer, as well as n blocks of angular coordinate measurement, a calculator and a target indicator, each block of angular coordinate measurement contains a series-connected amplitude detector, error signal amplifier and error signal detector, outputs the frequency analyzer is connected to the inputs of the blocks of measurement of angular coordinates, the outputs of which are connected to the inputs of the computer, the output of which is connected to the input of the indicator, while the calculator determines its own speed of movement of each shiny point of a recognized target from the expression
$$V_i=\frac{\Delta f_i\lambda }{2\cos \Delta {\varphi }_i}$$

,
where λ is the wavelength of the emitted signal, the obtained values of the intrinsic speed of each brilliant point are compared in accordance with the expression ΔV _i = | V _i -V _{i + 1} |, when ΔV _i ≤U, where U is the threshold value, a decision is made on whether signals of one target, characterized in that they determine the group target based on a comparison in the calculator of the values of the proper speed of each brilliant point ΔV _i = | V _i -V _{i + 1} | with a threshold value of U ₁ , while in the case of ΔV _i ≥U ₁ decide on the belonging of the signals of the group target.

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