Recirculation accumulator of a stack of mutually coherent radio-impulses

FIELD: radio engineering, possible use for finding a stack of mutually coherent impulses.

SUBSTANCE: device contains input block, connected to first input of adder. Second input of adder is connected to output of reverse communication amplifier. New feature is the introduction of compensating amplifier and band filter. Input of amplifier is connected to output of delay line, and output of amplifier is connected to input of band filter. Delay line consists of input, intermediate and output of inter-digital transformers on sound-conductive substrate. Duration of interaction of train of waves in output inter-digital transformer is selected to be several times or several dozen times greater than delay of signal between input and intermediate inter-digital transformers, output inter-digital transformer is made in form of continuous mono-periodical structure, matched with carrying frequency of received radio-impulses, and connected to input of compensating amplifier. Pass band in band filter is selected to be commensurable with reverse value of duration of radio-impulse signal generated in output inter-digital transformer.

EFFECT: increased detection capability of accumulator without worsening of its stability.

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The invention relates to the field of radio and can be used in locations as detector packs mutually coherent radio pulses.

Known for optimum filters and the drive pulse signals, maximizing the signal-to-noise in their outputs, in particular the recirculation drives, in which the period of circulation is set equal to the repetition period of the impulses in their original pack. Know the use of delay lines on surface acoustic waves including a dispersive delay lines, applied to the solution of various engineering problems [1-10].

The closest analogue to the proposed technical solution is recirculated drive packs mutually coherent radio pulses, known from the book Justina, Optimal filters, and the drive pulse signals, M, Owls. radio, 1969, str-286, RES. This drive has consistently enabled input device, an adder with two inputs, a delay line and a feedback amplifier, the output of which is connected with the second input of the adder with two inputs.

A disadvantage of the known device is the difficulty of ensuring a high detecting ability associated with the need to ensure stock sustainability recirculator with increasing feedback factor, when choosing ecosocialist, close to one.

This disadvantage is eliminated in the proposed technical solution.

The aim of the invention is the enhancement of detecting the ability of the drive without compromising its stability.

This technical problem is achieved in the device containing the serially connected input device, an adder with two inputs, a delay line, the amplifier feedback output connected to the second input of adder with two inputs, characterized in that it introduced successively United compensating amplifier and band-pass filter, the delay line consists of input, intermediate and output interdigital transducers on a conductive substrate, and the duration of interaction of the wave train in the output interdigital transducer selected in multiple units or tens of times greater than the signal delay between the input and intermediate interdigital transducers, interdigital the Converter is implemented in the form of a continuous nonperiodically patterns, consistent with carrier frequency of the received impulses, and connected to the input of the compensating amplifier and the bandwidth of the bandpass filter is selected commensurate with the reciprocal of the duration radiopulse signal generated in the output interdigital Converter is barely.

The achievement of the task due to more accumulation in the extended structure of the output interdigital transducer (IDT) and narrowband filtering coherently extended duration radiopulse response with delay lines of the claimed design with the optimal choice of the transfer function of the recirculation circuit.

The invention is clear from the submitted drawings.

Figure 1 shows the block diagram of the inventive device, consisting of series-connected input device 1, an adder with two inputs 2, the delay line 3 input 4, intermediate 5 and the output IDT 6, the compensating amplifier 7 and a bandpass filter 8, and is positioned between the intermediate IDT and the second input of the adder with two inputs of the feedback amplifier 9.

Figure 2 is given chart of the process of accumulation of signal in the output IDT with a long interaction of the wave train.

The inventive device operates as follows.

Let the input device 1 acts bundle of p mutually coherent radio pulses duration τandwith a period of repetition in the bundle T (length of the tutu pT). Full time delay in the recirculation circuit of the serially connected adder with two inputs 2, the delay line 3 between the input 4 and the intermediate 5 IDT and Wuxi is Italia feedback 9 selected equal to the repetition period T of radio in the stack. This site is known as a recirculating memory. Thus exponentially increasing the amplitude of the radar pulse, cumulative in the recirculation circuit, enters the delay line 3 to the output IDT 6, within which is placed N impulses, and this number N is determined by the length of the output IDT Loand the velocity v of propagation of surface acoustic waves in sucoplate delay line 3, so that Lo=vNT. The design of the output IDT 6 is selected consistent with carrier frequency f0of radio - step between adjacent electrodes of this IDT is selected as the condition for coherent accumulation d=v/2f0. Therefore, an additional N-fold coherent accumulation of the signal provided at the output IDT 6, in which a bundle of impulses are converted into a single longer a radar pulse, which after amplification in the presence of compensating amplifier 7 (compensative signal loss in the delay line 3) anti-aliasing in the bandpass filter 8 with bandwidth ΔfFconsistent with the delay of the signal in the output IDT 6 NT, i.e. when ΔfF≈1/NT. The transfer coefficient K0in the recirculation circuit is chosen close to unity (order...0,98 0,96), so that the time constant of the recirculator τPprovides the necessary accumulation in it of radiopulse the signal and τP=K0T/(1-K0).

It is easy to show that the result of the recirculation circuit, the amplitude of the radar pulse at its output APwhen receiving p input impulses compared with their amplitudes A0at the entrance of the recirculator coming from the input device 1, grows to size

Zug waves with amplitude Apis supplied to the output IDT 6, where the coherently accumulated. The process of increasing the amplitude of the impulses at the output of the recirculation circuit in time according to the expression (1), where j is the current index of summation j=1, 2, 3, ... p, and j=p is achieved amplitude specified in (1). After the bundle of impulses coming from the input device 1, the amplitude of the impulses Amat the exit of the recirculator begins to slowly decrease exponentially Am=AndPexp[-(m-p)(1-K0)/K0], where m=p+1, p+2, p+3, ..., as seen in figure 2 charts. Step recycling m>p in this expression is identical to the current time tmcounted after the expiration of the bundle of impulses in size p of radio.

Let the noise variance at the first input of the adder with two inputs 2 in stationary Gaussian noise is equal to σW2=G/2τand, where G is given the th this input noise spectral density, determined noise characteristics of the input device 1. Then on the input IDT 4 the resulting variance of the noise is from the expression

From (1) and (2) shows that the ratio signal/noise at the input of the delay line 3 when the maximum amplitude of the radar pulse is

when working on the equivalent of a 1 Ohm load. When operating on an arbitrary load is more convenient to use the power of the input signal in a bundle of impulses, thus (3) can be written in the form

where μ0=2E/G=2τandPI/G is the maximum possible signal-to-noise ratio at the input of the matched filter, which is determined by the energy E of a received signal with its input power PI.

For the formation of a sufficiently long time radiopulse response in the output IDT 6 delay line 3 it is advisable to use recirculator with a larger time constant τP=K0T/(1-K0), but is somewhat lower value μmax Ias it follows from (4), and therefore, optimization of the signal-to-noise ratio at the output of the delay line 3 is provided at a certain choice of the feedback factor K0in the recirculation circuit, depending on the number p of radio in the stack, and, in addition, this you the PRS is also determined by the value of N, that is, the length NT of the interaction of the wave train in the output IDT 6 is applied to the delay line 3, which indicates the inseparable conjunction of known and newly introduced features of the proposed technical solutions.

Indeed, the greatest response at the output of the delay line 3 is reached when the wave train with the amplitude AndPaccording to (1) reaches the end of the output IDT 6, and the working length LoIDT 6 are simultaneously trains the subsequent responses of the recirculator, the amplitude of which is Amexponentially decrease due to the expiration of radio packs, and all these trains induce in the respective elements of the output IDT 6 electrical signal response, increasing its power.

The maximum amplitude Ando maxthe radar pulse at the output of the compensating amplifier 4, the complementary signal loss in the delay line 3, is determined by the ratio

where j=p, p+1, p+2, ... p+N-1, that is coherently summed N wave trains in the output IDT 6 at time tN=NT+Δtasswhere the initial delay Δtasscaused by passage of a wave train between the input IDT 4 and the beginning of the output IDT 6 in the delay line 3, is chosen quite arbitrarily, for example, equal to ≥2T.

Consider the passage of noise on the output of the delay line 3 based on the sustained fashion interaction of its output IDT 6 with applicable therein signal. Believe band noise corresponding to the bandwidth of the input device 1 ΔFI=1/τandtherefore, the correlation time of the noise estimated value τand. Then the addition of the noise component in the output IDT 6 is the superposition of n statistically independent noise sources, where n=NT/τand=qN, where q is the duty cycle of radio in the stack, and the noise variance at the output of the delay line 3 is equal to

Assuming the bandwidth of the band pass filter 8 is equal to ΔfF≈1/NT, notice that the ratio ΔFI/ΔfF=n, and then the output of the band pass filter 8, the noise variance will be equal to

Comparing (6) and (7), we arrive at the conclusion about the invariance of the noise variance at the output of the band pass filter 8 in relation to the duration of the interaction NT of wavetrains in the output IDT 6. However, the gain in the signal-to-noise Wo maxthe output of bandpass filter 8 compared signal-to-noise ratio at the input of the delay line 3 subject to (5) is equal to

From (8) it follows that the value of winning Wo maxdoes not depend on the number of pulses p in the stack and is determined only by the parameters N and K0significantly increasing with the growth of these numbers. This helps to increase the detecting ability of the device is STV.

In table 1 the calculated data of the specified gain for different values of the number N and the feedback factor in the recirculator K0.

td align="center"> 7,509
Table 1
Coeff. mostly due to K0N=5N=7N=9N=11N=13N=15
0,994,9006,7928,64610,46412,24413,989
0,9854,8516,6908,47510,20511,88413,512
0,984,8026,590UAH 8.3069,95411,53513,054
0,9754,7536,4908,1409,70811,19812,612
0,974,7056,3927,9789,46910,87112,188
0,9654.6566,2957,8199,23610,55411,780
0,964,6086,1997,6629,00910,24811,388
0,955at 4,5606,1048,7889,96111,010
0,954,5136,0117,3598,5729,66510,648
0,9454,4665,9187,2128,3629,38710,299
0,944,4195,8277,0678,1589,1199,964
0,9354,3725,7376.9257,9598.8599,642
0,934,3265,6496,7877,7668,6089,332
0,9254,2795,5616,6517,5778,3659,035
0.924,2345,4756,5177,3948,1308,749
0,9154,1885,3896,3877,2157,9038,474
0,914,1435,3056,2597,0417,6848,210
0,9054,0985,2226,1346,8727,4717,957
0,904,0535,1406,0116,7087,2667,713

Consider the example implementation of the device for input signals with the following parameters: duration of radio τand=0.1 microsecond period in which they appear in the stack of p=20 pulses equal to T=1 µs, with a carrier frequency of radio f0=60 MHz. Then the bandwidth of the input device should be equal to ΔFI=10 MHz. Based on the requirement to ensure sufficient stability of the system, select the feedback factor in the recirculation circuit is equal To0=0,985, then the value ofPthe result of accumulation of 20 pulses packs will reach AndP=17.4 years, and this part of the wave train is arriving at the input IDT of the delay line has a length of about 6 μs from level 0,707 AndP. After the stack amplitude of the impulses due to the continuing action of the recirculator exponentially decreases at the input of the delay line with a time constant of τP=K0T/(1-K0)=65,7 ISS, and will be reduced to level 0,APduring 23 ISS. The total length of Zug of the received radar pulse will be 6+23=29 ISS level 0,707 AndP. This means that the value of N=29. The length of the output IDT 6 at a speed of acoustic waves v=3,16 mm/μs (for quartz) will be Lo=92 mm, and the total d is in the delay line will not exceed 95 mm Step IDT d=26,3 μm. The bandwidth of the bandpass filter is selected equal to ΔfF=35 kHz. The use of such a device gives the gain in the signal-to-noise Womax=23.6 times (˜27,5 dB) compared to the recirculating storage device of known construction (prototype).

The claimed technical device is designed to detect stack mutually coherent radio pulses in a wide range of wireless devices (radars, communication systems, telemetry etc). Current delay lines on ultrasonic surface waves allow you to work in the frequency range up to several hundreds of megahertz or even up to 2 GHz with a bandwidth of up to 20-40% of the carrier frequency with a high accuracy location on zvukosnimateli (special cuts of quartz, gallium arsenide and other) elements of the IDT and low dependence of the line parameters of temperature.

LITERATURE

1. Viewership. Dispersion-temporary methods of measuring the spectra of signals, M, Owls. radio, 1974.

2. ISi. Device signal processing on surface acoustic waves, M, Owls. radio, 1975.

3. Age, Pment, Dighenis. Theory design and application of Fourier processors on surface acoustic waves, TIER, t, No. 4, p.22-43, 1980.

4. Offensi. Device for analyzing the spectrum of the signals. RF patent №2040798.

5. Offensi. The detector monopulse signal. RF patent №2046370.

6. Offensi. The detector laser Doppler locator. RF patent №1805756.

7. Offensi. Consistent filter. Patents of the Russian Federation No. 2016493 and No. 2016494.

8. Offensi. Device for analyzing the spectrum of signals. RF patent №2040798.

9. Offensi. The detector monopulse signal. RF patent №2046370.

10. Offensi. Ultrasonic microscope. RF patent №2270997 for 2005.

The recirculation drive packs mutually coherent radio pulses containing serially connected input device, an adder with two inputs, a delay line, the amplifier feedback output terminal connected to the second input of the adder with two inputs, characterized in that it introduced successively United compensating amplifier and band-pass filter, the delay line consists of input, intermediate and output interdigital transducers on a conductive substrate, and the duration of interaction of the wave train in the output interdigital transducer selected in multiple units or tens of times greater than the signal delay between the input and intermediate interdigital transducers, the output of the counter is whip the Converter is implemented in the form of a continuous nonperiodically with the touch, agreed with the carrier frequency of the received impulses, and connected to the input of the compensating amplifier and the bandwidth of the bandpass filter is selected commensurate with the reciprocal of the duration radiopulse signal generated in the output interdigital Converter.



 

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