SU717674A1 - Signal detector - Google Patents

Description

(54) SIGNAL DETECTOR

I.

This invention relates to radnolocacin. .

The detector detector is known, containing the first unit of comparison, the first and second; the inputs of which are connected respectively to the output of the detector and the output of the meter of the federal value of the signal 1.

However, the known detector does not ensure the stability of the likelihood of a false alarm when exposed to heterogeneous interference.

The purpose of the 413 invention is to increase the stability of the probability of a false alarm when exposed to non-uniform interference.

To do this, the first key and the first key and serially connected time quantizer, the first delay element, the amplifier, the second comparator block, the second delay element are entered into the signal detector containing the first comparison unit, the first and second inputs of which are connected respectively to the detector output and the output of the average signal value detector. , a coincidence unit and a second key, in this case, the detector output is connected to the input of a temporary quantizer, the output of which is RSC {en with the second input

The second comparator unit and the first input of the first key, the output of which is connected to the first input of the average value meter, the amplifier output via the second key is connected to the second input of the average signal value meter and the output of the second comparison unit is connected to the second input of the first key and the second input of the matching unit. .

FIG. 1 shows the structural electrical circuit of the proposed detector, FIG. 2, the detection characteristics.

The detector contains detector 1, time quantizer 2, delay line (element) 3, amplifier 4, comparison unit 5, delay line 6 (element 6, key 7, match block 8, key 9, meter 10 average value of the signal, and block time & eleven.

The detector works in the following way.

The input signal after detection is fed to the input of the time quantizer 2, which samples the input signal with a sampling interval. equal to the resolution interval. The samples of the received sample are received through the delay line 3 for the resolution interval at the input of the amplifier 4 with a gain factor. C, to the corresponding input of the unit of comparison 5 and through the key 7 to the meter 10 of the average signal of the signal. Key 7 is open only in the case when the control voltage at the output of the comparison unit 5 corresponds to condition 0 (CUj., Where CUjH is the signal at the output of the amplifier 4. Circuit: delay line 6, coincidence unit 8 and key 9 provides passage to The i-th instant of time at the input of the measured 10 elements of the sample CUj-i j under the condition ,, r ,, Ц .., .., -, which corresponds to the accepted hypothesis of the inadequacy of the appearance of signals of impulse interference in the adjacent resolution intervals. performed by opening key 9 when the signals of current values exceeding the current signal coincide. The analysis from the outputs of keys 7 and 9 is used to estimate the average value of the process in accordance with the algorithm U) 5 (2 .. 1), J where Y is some correction factor ,. If, is the number of elements of the sample passed to the meter 10. This estimate, multiplied by the corresponding false alarm coefficient, is used as the Un threshold for the comparison block 11, at the output of which the target is detected, if Up. The detection characteristics of this detector were calculated by expression. ) rb. |) yWm cVI)) (V)) where Ni, and Nj are in common with the stationary noise elements transmitted to the meter 10 average signal if there are 4 stationary and impulse noise elements on the amplifier during the amplifier (NW N 2 M , MI M, where, the total size of the training sample, M is the number of impulse noise signals in the training choice MI is the number of impulse noise signals transmitted to the average meter, (.b 4-f with mM-V, K is the coefficient determining the probability of a false alarm prn the condition of the system in conditions of stationary interference only; ex / stationary interference; 1 — signal-to-donor-signal interference ratio. The detection characteristics were calculated for a simple pulse signal and are indicated by a dotted line in Fig. 2. To the left of these curves are the curves realized by a known detector, in the absence of impulse noise signals. corresponding to the operation of the prototype in the presence of a pulse interference in the sample of sigula. As studies have shown, for a stabilized false alarm level 10, the relative error is equal to 2, The total sample size is N, equal to 70, independent of the power of the pulse interference signal. The forms of the invention, the Signal Detector, contains the first comparison unit, the first and second inputs of which are connected respectively to the output d, the detector and the output of the average signal meter, characterized in that, in order to increase the stability of the probability of a false alarm when exposed to heterogeneous ommeh , the first key and the serially connected time quantizer, the first delay element, the amplifier, the second comparison unit, the second delay element, the coincidence unit, and the second key are introduced, and the detector output oedinen to the input temporary quantizer, whose output is connected to a second. the input of the second comparison unit and the first input of the first key, the output of which is connected to the first input of the average value meter, the amplifier output is connected via the second key to the second input of the average value meter, and the output of the second comparison unit is connected to the second input of the first key and the second input of the unit sov-. fall. Sources of information taken into account during the examination 1. USSR author's certificate N ° 374562, cd. G 01 S 7/30, 15.02.73 (prototype).

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Claims (1)

A signal detector containing a first comparison unit, the first and second inputs of which are connected respectively to the output of the detector and the output of the average signal meter, characterized in that, in order to increase the stability of the probability of false alarms when exposed to inhomogeneous signals, the first key and a time quantizer connected in series , the first delay element, an amplifier, the second comparison unit, the second delay element, the coincidence unit and the second key, while the output of the detector is temporarily connected to the input quantizer whose output is connected to the second input of the second comparison unit and the first input of the first key, the output of which is connected to the first input of the average signal meter, the amplifier output is connected through the second key. with the second; the input of the average signal meter <, and the output of the second comparison unit is connected to the second input of the first 'key and the second input of the sov- block. . fall.