SU396837A1 - DEVICE OF AUTOMATIC REGULATION OF AVERAGE NUMBER OF NOISE EMISSIONS - Google Patents

Description

one

The invention is fireproof and can be used in pulsed radiolocation systems to maintain a constant number of noise emissions from the inputs of the devices, automatic | CK011 processing information or indicators, detect, 1, as well as in other areas of the radoflower, where the task is to optimally extract the signal on the disturbance foul according to the Neumann a-Pearson criterion.

The known devices for automatic control of the average number of noise spikes, containing a limiter, in the feedback circuit of which serially connected video signal normalizer, integrator and DC amplifier are inadequate.

The purpose of the invention is to eliminate this drawback.

This goal is achieved in that the device is made in the form of two first stages of automatic control connected in series, and a second voltage multiplication circuit is added to the second stage feedback circuit between the integrators and the DC amplifier, to the second input of which connect the output and “Telrato stu pegvi.

The drawing shows a block diagram of the device connection

At and om and t; i ches about r e gu .i ipov aai and ch. iUivMOBbix emissions.

On the I / O limiter nerve steps / signals from the video amplifier receiving device. The output of the limiter /. Is connected to the input of the quantizer of amplitude 2 of the first stage, from the output of which video amplitudes normalized in amplitude exceeding the threshold of restriction of the first stage are fed to the integrator 3 of the second stage. A reversible counter representing a 11-bit reversible counter, the output of which is subtracted. A set of false alarms is often given, and the add-in input is normalized but amplitude video pulses, while the counter outputs are connected to the inputs of a code-voltage converter. The voltage from the integrator 3 through the DC coupler 4 is fed to the control input of the limiter limiter limit}. The output of the limiter / connected to the input of the limiter 5 BTOpoii stage, the output of which is connected to the input square of the second stage 6, from the output of which video amplitudes normalized in amplitude exceeding the threshold limit of the second stage, go to the second stage integrator 7. The voltage from the integrators 5 and 7 is fed to the multiplication circuit 8, from the output of which through the DC amplifier 9 multiplied

Voltage nocTyiKiei "and in. Regulated. By: restriction threshold is limited 5.

It is known that the frequency of noise and jitter distributions,, exceeds: b: the threshold of limitation is determined by the formula:

.U, / fV

(S

) -. -J

where .r | .--- is the average number of noise emissions exceeding the reference threshold;

/ 0 - limit threshold;

stm-meannequadraig-myue zy and it is not a noise;

A / - nolos transmission lriemn: Ika;

K is a coefficient that depends on the shape of the amylitol ONE-part of the current characteristic, and on the filter and receiver. Thus, in order to keep the value of the average number of noise emissions at the output of the limiter constant, when cfM changes, the threshold for limiting C / o must change by the same amount. Consequently, at unsteady noise, the voltage | at the output of the integrator 5 varies proportionally to C7m, t. e. t / i AiaM. Integrator 3 is supplied with the highest possible frequency, determined from the above formula for setting / o, catching, while keeping it constant

SU.h

digital integrator 3 will be minimal. The integrator 7 is supplied with a frequency equal to the specified alarm frequency, when its time constant is obtained, two to four orders of magnitude longer than the constant time of the integrator 5. This is why there are ip changes in noise conditions under unsteady interference conditions and C / 2 At the output of the integrator 7, it does not have time to change, as such. My change in the limit threshold of the limiter 5 is due to the rapid change in the voltage Ui at the output of the integrator 3. At the output of the circuit, the multiplier 8 1;

and, km.i, k, km, -.

as a result of: the C / 3 voltage at the output of the integrator 7 instabilities of the limiter limit threshold 5, related to the drifts of zero amps current amplifiers, temperature limit instabilities, limiters thresholds, and with the same causes that cause unacceptable factors; electrical device elements, as well as changes in the density of the determination of noise emissions under the influence of noise interference.

NEEDER invented} i

An automatic regulation of the average number of noise emissions, containing a limiter, in the feedback circuit of which are connected in series the normalizer of the amplitude of video signals, the integrator and the DC amplifier, characterized in that, in order to improve speed, the device is made in the form of two series-connected stages of automatic control, and in the second stage of the feedback circuit between the said and the integrator and the amplifier of the direct current a circuit is introduced and on the threshold | Pr.Ya1zhen.y to the second: th input is connected to the output of the first stage nptegratora.

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