SU949623A1 - Square pulse center meter - Google Patents

Description

(54) THE METER OF THE CENTER OF RECTANGULAR T11 TULTS

one

This invention relates to radar measurements.

A device for determining the midpoint of time intervals (pulses) is known, comprising a reference generator, two reversible counters, a comparison circuit, an output unit, differentiating circuits and logic elements OR 1,

Odaako this device does not provide sufficient accuracy ..

The closest to the proposed technical entity is a device containing a counting impulse generator connected to the trigger input, a single output of which is connected to the input of the element I, the second input of which is connected to the output of the second trigger, the output of the element of And connecting to the input of the inputs of the second and third flip-flops, the output of which is connected to the input of the second element AND, the second cumulative counter, the elements NOT and OR, whose inputs are connected to the outputs of the elements AND, and the output Yuchen to the input of the second cumulative counter, the output of which is 2

It is connected to the single input of the second trigger, the other input of the second storage counter is NOT connected to the input of the second trigger and the input bus 2 via the element,

The disadvantage of this device is its complexity.

The purpose of the invention is to increase the speed and reliability of the device.

The goal is achieved by the fact that in the meter of the center of a rectangular pulse,

10 containing a generator of counting pulses, the output of which is connected through the first trigger to the first input of element 2И-OR, the second input of which is connected to the output of the generator of counting pulses, the third input of the element

Claims (2)

15 2I-OR is connected to the output of the second trigger, and the output of element 2И-ШШ is connected to the input of the accumulative counter, two pulse generators are introduced, the input of the first of which is connected to the fourth input of the element 2И-OR, and the output is connected to the first input of the second trigger, the second input is through the second driver connected to the output of the cumulative counter. The drawing shows a structural electrical scheme of the proposed meter. The meter contains a generator 1 counting pulses, triggers 2 and 3, element 2-OR 4, cumulative counter 5, drivers 6 and 7 pulses. The input signal is fed to the input bus 8. The meter operates as follows. In the initial state, trigger 3 generates a inhibitory potential at the fourth input of element 4, and counter 5 is reset. The input measured rectangular pulse enters the second input of element 4, where the frequency f is obtained quantized by dividing generator frequency 1 by two frequencies. The number of quantization pulses is counted by counter 5. At the end of the measured rectangular pulse t, the driver 7 produces a pulse which sets the trigger 3 to one state, allowing the arrival of 2f pulses from the generator 1 through element 4 to the input of the counter 5. When the counter 5 overflows (zeroing), the former 6 generates a pulse of a predetermined duration, by which the trigger 3 returns to the initial state of prohibiting the passage of pulses from the generator 1 to the input of the counter 5. The number of states N of the counter 5 is selected based on the maximum possible duration of the input measured rectangular pulse c / max when quantized by its frequency f and is defined by the expression where t 1 / f is the pulse period of frequency f. During the operation of the device, the input of the counter 5 receives a sequence of pulses, the number of which is constant and determined by the number of states N of the counter 5, and the duration of the time interval Ti during which the measurement is carried out varies depending on the duration and is determined by .l m makc where 1 max - the duration of the maximum possible input rectangular pulse; - - duration of the measured rectangular pulse. To bring the device back to its original state, for example, after energizing it, it is sufficient to apply a pulse to its input. The proposed device can reduce the measurement time. For example, at the maximum possible duration of the measured rectangular pulse J max the measurement time T, calculated from the moment of arrival of the input signal, is equal to and in the prototype 1.5 o max. In addition, it is simpler in comparison with the known devices having the same technical characteristics. The invention The meter of the center of a rectangular pulse, containing a counting pulse generator, the output of which is connected through the first trigger to the first input of the element 2I-OR, the second input of which is connected to the output of the generator, counting pulse, the third input of the second 2I-OR is connected to the output of the second trigger, and the output of element 2I-OR is connected to the input of the cumulative counter, which is characterized by the fact that, in order to increase speed and reliability, two pulse formers are inputted into it, the first of which is connected to a quarter m 2I-input OR element, and an output connected to the first input of the second flip-flop, a second input thereof via a second generator connected to the output incremental counter. Sources of information taken into account in the examination 1. Authors svdedelstvo USSR № 420984, cl. G 04 F 10/00, 04/04/72. 2. USSR author's certificate number 553588, cl. G 04 F 10/04, 10.12J5.