SU978165A1 - Signal parameter random value probability density distribution meter - Google Patents

Description

The invention relates to analog computers and is intended to study the characteristics, random variables, in particular probability density, and can be used in radio engineering and radio electronics to assess the accuracy of various parameters of electronic devices. For example, the task of obtaining the law of the distribution of errors characterizing the accuracy of target tracking by radar means can be solved.

A device for obtaining a probability density of a random variable distribution is known, comprising a recording unit, a storage tube, an input signal amplifier, whose input is the information input of the device, and the output is connected to a vertical deflection system of a storage cathode ray tube. which is connected to the output of the sweep generator, and to the modulating electrode - the output of the first backlight pulse former, whose input is synchronized the device's input, element, Exclusive OR, a pulse counter, a read signal amplifier, an electronic switch and a second backlight pulse generator, the output of which is connected to a modulating electrode of a storage cathode ray tube, the target of which is connected to the first input of the recording unit, second entrance

10 of which is combined with the input of the second illuminating pulse generator, with the first inputs of the electronic switch and the XOR element, respectively, and connected to the output of the pulse counter, the input of which is combined with the second input of the XOR element, and the output of the electronic commutator connected to the horizontal deflecting system of the storage cathode ray tube, and the second input of the electronic switch is connected to the output of the scan generator, the output of the cient exclusive-OR connected to the input of the first pulse shaper 1 illumination.

The disadvantage of this device is the lack of indication of the results of determining the probability density function of random variables, which complicates the work of the operator. The purpose of the invention is to provide a visual indication of the probability density function of random variables. This goal is achieved in the known device containing a storage cathode ray tube (ZELT), an electronic commutator of the input signal amplifier, a backlight pulse generator, a pulse counter, a sweep generator, a read signal amplifier and a registration unit, while the amplifier output the input signal is connected to the first input of the electronic switch connected to the deflection plates, the output of the pulse counter is connected to the second input of the electronic switch and to the first input of the register unit and, the first and second outputs of the sweep generator are connected to the third and fourth inputs of the electronic switch, respectively, the third output of the sweep generator is connected to the first input of the backlight pulse generator, the output of which is connected to the ZELT module, and the ZELT target is connected to the unit through the read signal amplifier registration, serially connected delay block and transducer Amplitude time are input, while the output of the pulse counter is connected to the second input of the amplifier of the read signal and to go sweep generator, a second output signal of the read amplifier is connected to the second input of the pulse illumination and to the input of the delay unit, and output time-amplitude converter connected to a third input of the illumination pulses. FIG. L is a block diagram of a meter for measuring the density of random variables of signal parameters; Fig. 2 shows a visual image obtained on the screen of a storage cathode ray tube; Fig. 3 shows voltage plots explaining the principle of operation of the meter. The meter contains an input signal amplifier 1, an electronic switch 2, a storage tube 3, a backlight pulse shaper 4, a read signal amplifier 5, a counting unit b, a pulse counter 7, a generator 8 times of rotation, a delay block 9 and a converter 10 Amplitude-time. The meter operates in two modes: write and read. In the initial recording mode, the amplifier 5 of the read signal at the first input is closed, the electronic switch 2 allows the input signal, amplified by the input signal amplifier 1, to pass through the vertical deflection plates of the storage cathode ray tube. 3, and a sawtooth voltage of time sweep is applied to its horizontal deflection to the plate qi when starting the sweep generator 8. Pulse counter 7 is in the reset state. Starting the measurement, the operator sets the measurement time by changing the conversion factor of the pulse counter V. The input of the amplifier 1 input signal is a signal that is shifted in time relative to the sync pulse supplied to the clock input device. As a result, a sweep generator 8 and a backlight pulse generator 4 are started, which generate a pulse voltage of duration equal to the duration of the forward sweep stroke. The electron beam of the recording electron beam of the storage cathode-ray tube 3 is opened and the focused beam of fast electrons is deflected in the electric fields of the horizontal and vertical deflecting plates, and commutes the elementary target accumulators. Thus, a halftone potential relief 11 (figure 2) is formed on the target surface, the depth of which is proportional to the residence time of the electron beam. on the dielectric surface of the target, and, consequently, on the probability density of a random variable, for example, the temporary position of the target pulse; relative to the sync pulse. When the meter 7 is filled with pulses, a voltage pulse appears at its output, switching the device into readout mode. In read mode, said pulse of pulse counter 7 opens, at the first input, the amplifier 5 of the read signal, changes the operating mode of the sweep generator 8, which generates the voltage level of the raster scan, starts the recording unit 6 and changes the state of the electronic switch 2 so that passing the sawtooth of the vertical sweep to vertical, and the horizontal sweeping to the horizontal deflection plates. The shaper of 4 light pulses, which start up with the horizontal sync pulses of the sweep generator 8, opens, similarly to the recording mode, the electronic searchlight of the electron-beam storage tube 3. As a result

The electron beam of fast electrons, rotating in electric across the vertical and horizontal declining plates of a raster scanner, scans the entire dielectric surface of the target and crosses the previously deposited halftone eigenvalue. When reading out more than the applied potential relief on the target load, elevation pulses appear, the amplitudes of which are proportional to the magnitude of the probability density functions of a random variable (Fig. 3a).

As the amplifier 5 of the read signal, the mark-pulses are amplified, normalized in duration (see

 f (t) of FIG. 3b), after which they enter block 6 of registration, where they are fixed; to the second input of the imaging unit 4 light pulses, which stops the formation of the light pulse line and in block 9 of the delay. In block

9 Delay, the time delay ut (fig. 3) of the read signal is carried out by an amount that ensures the displacement of the point potential relief 12 relative to the previously recorded grayscale potential relief 11 (figure 2). Delayed and normalized mark pulses, the amplitudes of which correspond to the depth of the semitone potential relief, enter the converter

10 amplitude-time Converter 10 Amplitude-time forms a sequence of pulses normalized by duration and amplitude (see also „f (t) of fig. 3g), the temporal position of each of which relative to its pulse mark is proportional to the amplitude voltage of the latter. The impulse voltage removed from the 10 Amplitude-time transducer triggers the backlight pulse shaper 4, which in this mode generates short illumination pulses and opens the electronic searchlight of the storing electron beam tube 3. As a result, a point potential is formed on the dielectric surface of the target relief 12, the configuration of which corresponds to the density distribution function of a random variable. The visual reproduction of the reliefs is carried out by irradiating the target with an electron beam of slow electrons which are formed by a reproducing electron searchlight of the storage cathode ray tube 3.

The introduction of a series-connected delay unit and an Amplitude-time converter with corresponding electrical connections between them and blocks of the known device allows providing a visually sensible indication of the probability density distribution of a random variable, which greatly simplifies the operator's work when making a preliminary decision on the results of the device operation.

In addition, the use of a storage cathode ray tube with a single fast electron flashlight simplifies the device and increases the reliability of its operation.

Claims (1)

1. USSR author's certificate in application 2858826 / 18-24, cl. G About G 7/52, dated 12/7/79 (prototype). five inp. 1 TO Ljhlgg Uc and l Jij | hp