SU1332541A1 - Device for receiving radio-pulse signals - Google Patents

Description

Inventorize (vrnocnTCH to iikik and could be ipolted in the first. P. Ruins of the r.dio impulse gnarylop whose own noises are disturbed by ypoFienb input noise,

The goal of the invention is to reduce the loss of intrinsic noise.

Fig. 1 shows a structural electrical circuit of the device; FIG. 2, the gr. —fchk dependence of noise gain on the number of channels N and the law of channel combination.

A device for receiving radio pulse signals contains N channels 1, frequency converters 2, detectors 3, selectors 4 of maximum amplitudes. and duration, multiplier 5, adder 6 and in; 1.icator 7,.

The device works as follows

If there are no radio pulses on the input of the device on channels 1, there are 2 converter frequency tumes. After detection in the detectors 3, the noise envelope is selected according to the amgishudo and duration by the selectors 4, while the outputs of the channels are not pulsed with small amplitudes and d; p, the output signals of the canal 1 gp: pi are formed to form combinations of N by 2, and multiply the signals on the intermittent x 5. In total, the device contains K C multipliers, which are divided into the N-1 group, and the j-group is from the NJ multipliers, where ,,,, (N-1), Output signals channels at the inputs of multipliers are normalized by aMnJni- amplitude and nonidentity of amplitudes The characteristics of the channels appear in the same way as the effects of interference, t, e, causing Jifi6o to skip the signal or to create a spurious signal. Due to the uncorrelated noise, the likelihood of the formation of pulses at the outputs of the multipliers 5 as compared with the individual KaiiajiOM decreases sharply,

The results of the multiplications are summed on the adder 6 and fixed in the indicator (fe 7,

When the signal has already been detected by the indicator M1, a burst of parameters is produced, such as the temporal position of the signal, the duration of the frequency pulses, and so on.

If there are radio pulses at the input of the device, in channels 1 there is an a; 1,; 1 tiiiia mixture of signal and noise.

After detecting in the detectors T the waveforms of the signal and noise are selected by amplitude and duration by selectors 4, this pulse of the channel 1 does not have small amplitudes and durations, the frequency of formation of pulses at the outputs of the multipliers 5 for strongly correlated parts of the signal and noise in some channels, 1 is significant, and for weakly correlated ones (with a weak signal) it approaches the considered case of the absence of a radio signal. The results of the multiplication are summed in adder 6 and the signal is detected by the indicator | -orom 7, the detection.

If there are only normally distributed noises in channels 1, the probability L is different (the 7th alarm P. in the i-th channel 1 is determined by the expression

B

P exp -0,5 (- | -)

where a is the amplitude threshold of the selector A; i - avg / 1 squared value

noises

After multiply 1P1 signals in groups of M channels on the j-th multiplier it seems likely) 1 (5 times the false tripod P in the absence of correlation between the channel noise becomes equal to

shit

 exp

g M a

.

p 1 After summing up the results of works, the probability of a false alarm

  (} (1) L 6 J

If an additive mixture of noise and a radio pulse with an envelope amplitude A is present at the input, the probability of detecting a signal in the i-th channel P is determined by the expression

  F (),

about

where, -X v

F (x) 1 dx,

(2 -

After multiplying and summing up, the resulting probability of detecting

55

Р ° 1 - Г, () Р

(2)

Establishing the ratio a / i according to the Neumann-Pearson criterion of the outcome of

given tripod probability, get the value of the selector threshold from the formula (1)

and the magnitude of the minimum amplitude of the radio signal

A + F (Vi-Vr- p ° K

Winning R is defined as j- | ln (1- Vl-P F-fl-VHl V -21n P + F- (P °))

The results of the calculation of the winnings produced by the formula (2) are shown in FIG. 2. From the analysis of the graphs (Fig. 2) it follows that the gain increases as the number of channels N increases. The choice of the number M of channels connected to one multiplier is achieved mainly with small values of M 2 or M 3.

The outcome from the analysis of technical and economic indicators of the most preferred option N 4, M 2 (figure 1).

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A device for receiving radio pulse signals containing N channels, as well as series-connected adder and indicator, the channel inputs being combined, and each of them contains series-connected frequency converter and detector, characterized in that, in order to reduce the level of intrinsic noise, C multipliers are introduced that form an N-1 group, with each j-group containing Nj multipliers, where j 1, ..., (N-1), and in each channel a selector of maximum amplitude and intensity is entered, whose input connected to the output the detector house, and the maximum amplitude and duration selector is the channel output, the first inputs of the jth rpynni.i multipliers are combined and connected to the j-ro channel, respectively, and the BTopr.ie inputs of the jth group multipliers are connected respectively to the outputs clals from the number from J + 1 to N, with the outputs of all multipliers 11o ;; are connected to the adder

I.Nikolaychuk

/

fue.2

Compiled by L. Nevd Ev Tekhred L. Serdyukova

Order 3850/56 Circulation 638 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5

Production and printing company, Uzhgorod, st. Project, 4

M

Proofreader M, Sharoshi

Claims (2)

Claim A device for receiving radio-pulse signals containing N channels, as well as a series-connected adder and indicator, while the channel inputs are combined, and each of them contains a series-connected frequency converter and detector, characterized in that, in order to reduce the level of intrinsic noise, C ² multipliers that form an N-1 group, and each j-th group contains Nj multipliers, where j = 1, ..., (N-1), and The calculation results described by the formula in FIG. 2. From the analysis of the gain, about (2), the graphs are shown (Fig. 2) that the gain increases by 20 as the number of channels N increases. The choice of the number of M channels connected to one multiplier is achieved mainly at small values of M = 2 or M = 3.25 Based on the analysis of technical and economic indicators, the most preferred option is N = 4, M = 2 (figure 1). FIG. 2