SU388273A1 - CORRELATOR - Google Patents

Description

one

This invention relates to specialized analog computing techniques for analyzing random processes.

In known correlators, various multiplication units are used, for example, a block using exponential voltage generators, comparison circuits, fixations, and triggers.

The purpose of the invention is to simplify the correlator.

For this purpose, the proposed correlator contains two comparison circuits, the first inputs of which are connected to the sources of the direct and delayed signals under investigation, the second inputs are connected to the first and second exponential voltage generators, and the outputs the triggers, the instantaneous value fixing circuit, connected by the control input to the second trigger, and the output connected to the integrator, the delay unit and the third exponential voltage generator, the output of the first trigger EPA is connected to the delay unit, which outputs are connected to the control inputs of the second and third exponential voltage generators, ai output; the latter is connected to a locking circuit instantaneous values.

The block diagram of the proposed correlator

presented in FIG. one; in fig. 2 dan

block diagram of the delay unit; on

FIG. 3 - diagrams for example in characteristic

points of the scheme.

The correlator contains three oscillators 1, 2.3 exponential per | Pr, l, two comparison circuits 4 and 5, two triggers 6, 7, controlled by cx, comparison terminals, delay block 8, instantaneous voltage clamping circuit 9, and integrator .

The delay unit S consists (of Fig. 2) of two AND generators, 12 voltage pn, two comparison circuits 13 and 14, and a trigger 15.

The principle of operation of the device is as follows.

The clock pulses periodically start the exponential voltage generators, as well as the sawtooth generator, and set the triggers to the initial position (Fig. 3, a).

At the moment (Fig. 3.6) of the equality of the input voltage and the exponential

in (0. ° (1)

comparison circuit 4 produces impulses,

the first of which triggers trigger 6

to zero state. From the equality of the soot, it can be seen that the duration of the pulse removed from trigger 6 is determined by the expression. , -. ". (2, t / 0. The received pulse is delayed by the delay time t in delay block 5 as follows. The falling edge of the delayed pulse (Fig. 3, c, d) triggers the glowing generator 12, the leading edge of this pulse, coinciding with the clock pulses, starts the generator 11 (Fig. 3, d). The sawtooth voltage is compared with a constant voltage using circuits 13 and 14. As a result, the comparison circuit 7.3 converts the trigger 15 into a single position, and the circuit 14 returns it to its original position (Fig. 3, e). Thus, both fronts of the delayed pulse. The leading edge of the pulse pulse triggers the waiting generator 3, and the falling edge starts the generator 2. The output exponential voltage of the generator 2 (Fig. 3, g, e) is compared with the current signal using the comparison circuit 5. At the moment of equality The pulse duration at the output of the trigger is (3) J1ВХ 13Л - 1П - «о (/, -, time interval / 2.4, equal to the sum of the intervals 4.3 and / 3.4, is determined by the distribution 1,,, (О 4.4 4.3 +4.4 Ш п «оUl At the moment of time, with Resp end of slot / 2 / "in Scheme 9 for fixation; pomInaets voltage instantaneous value L with tim generator 5. As a result, the output voltage ix L output of this circuit is proportional to the product of the input signals. The resulting voltages are applied to the integrator, the voltage at its output being determined by a similar relationship. Thus, the device implements the direct method of finding the correlation function using the indirect multiplication method. To change the correlation function argument, it is enough to change the constant voltage applied to comparison circuits 13 and 14. Object of the Invention Correlator containing two comparison circuits, the first inputs, which are respectively connected to the sources of the direct and delayed signals under investigation, the second the inputs are connected to the first and second exponential generators, and the outputs are connected respectively to the first and second triggers, the instantaneous value fixing circuit connected by the control input to the second trigger, and an output connected to the integrator, a delay unit and a third exponential voltage generator, characterized in that, in order to simplify the correlator, in it the output of the first trigger is connected to a delay unit whose outputs are connected to the control inputs of the second and third exponential voltage generators , and the output of the latter is connected to the circuit of fixation of instantaneous values.