RU2620191C1 - Device for measuring small time interval - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: device for measuring a small time interval consists of the first signal sensor, the second signal sensor and an OR element, a block of series connected delay lines, a counter, a block of matching elements and a secondary processing block. Technical result is achieved with the introduction of two high-speed triggers with the installation to its original state and the two matching elements. The elements of the device are interconnected according to the block-diagram of fig. 1.

EFFECT: increasing the resolution without increasing the cumbersomeness of the device.

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Description

The invention relates to the field of radio engineering and can be used in location and measuring systems.

A device for measuring a small time interval described in the patent of the author No. 2195686, bull. No. 36 dated December 27, 2002. It may include an interval start sensor, which can give out clock pulses and an interval end sensor that give out pulses, respectively, to a block of sequentially connected delay lines and to a block of coincidence elements. The output of each delay line is connected to the output of the corresponding match element. As a result, the code at the output of the block of coincidence elements will characterize a small time interval, and the information enters the secondary processing unit. However, the resolution of the device is not always sufficient. A device for determining a small time interval is presented in the patent No. 2501036 under the name "Altimeter", FIG. 2, 3, authors Chasovskaya A.A., Egorov V.A., Ivanitsky A.S., Lapshin B.C., bull. No. 34, dated December 10, 2013. It can also define a small time interval. But, unlike the aforementioned, it may include a counter working during the period between the clock pulses and the OR element. Moreover, the output of the OR element is connected to the input of the block of series-connected delay lines and to the input of the counter. The latter can provide information to the secondary processing unit and is set to its original state. However, the resolution is also not always sufficient. Using the proposed device increases the resolution without increasing bulkiness. This is achieved by introducing two high-speed triggers with initialization and two coincidence elements, while the output of the first signal sensor is connected to the first input of the first coincidence element and with the first input of the first high-speed trigger with initialization, the output of which is connected to the second input of the first element matches having an output connected to the first input of the element, or having a second input connected to the output of the block of series-connected delay lines, and the output and input torogo-speed flip-flop with setting the initial state, respectively connected to the second input of the second matching element and the second output signal from the sensor is also connected to a first input of the second matching element having an output coupled to the input of block matching elements.

In FIG. 1 and the following notation is used in the text:

1. secondary processing unit

2. second signal sensor

3. high-speed trigger, with reset

4. match element

5. matching element block

6. first signal sensor

7. high-speed trigger with reset

8. match element

9. item OR

10. block of series-connected delay lines

11. counter, while the output of the sensor of the first signal 6 is connected to the first input of the first high-speed trigger with initialization 7, the output of which is connected to the second input of the match element 8, having an output of connections to the first input of the OR element 9, having a second input, respectively serially connected delay lines 10 connected to the output of the unit and to the input of this unit, also connected to the input of the counter 11, and the quick-acting trigger with initialization 3 has an output and a first input, respectively connected directly to the second input of coincidence element 4 and to the output of the second signal sensor 2, also connected to the first input of coincidence element 4 having an output, connected to the input of coincidence element block 5, having a group of inputs and a group of outputs, respectively connected to a group of outputs of the block series-connected delay lines 10, and with a second group of inputs of the secondary processing unit 1 having a first group of inputs connected to the group of outputs of the counter 11.

The device operates as follows. The sensor of the first signal 6 generates a signal that sets a high-speed trigger to initialize state 7 to a single state, and also gives permission to element 8 to pass the signal from the zero shoulder of trigger 7. The duration of this signal is equal to the time it takes to set trigger 7 to a single state. An example of a specific implementation of a high-speed integral element, including a trigger, is presented in the book “Dynamics of Electronics” by Yu.I. Borisov, M .: Technosphere, 2007, p. 106. The shortened signal from the output of coincidence element 8, equal to the time of the flip-flop of trigger 7, is fed to the first input of OR element 9, and then from its output through the block of series-connected delay lines 10 to the second input of the aforementioned element OR 9 and with its output again to the input of block 10. The sensor of the second signal 2 generates a signal that sets a high-speed trigger with initialization 3 in a single state and also gives permission to the matching element 4 to pass the signal from zero a trigger arm 3. The synchronizer may be used as well as a second sensor signal as a first signal transmitter - receiver.

In FIG. 2 shows an exemplary diagram of the sensor of the second signal 7. It works as follows: the electromagnetic signal reflected from the object is received by the receiving antenna 12 and fed to the receiver 13, where it is converted into an electrical signal and is allocated according to the characteristics characteristic of the expected object. Then it enters the amplitude selector 14, where it is allocated according to the expected amplitude and enters the coincidence element 15, which gives permission to pass the selected signal through the time determined by the delay line 15. Thus, the time of signal extraction ensures the reliability of its reception, has a strictly defined value, taken into account during further processing.

An example of resetting a trigger is presented in B.C. Yampolsky “Fundamentals of Automation and Computer Engineering”, 1991, p. 82. The shortened signal from the output of the OR element 9 enters the block of series-connected delay lines 10 and from its output to the second input of the OR element 9. From the OR element 9, the signal is also arrives at the input of the counter 11, counting these signals in the period of time between the clock pulses from the sensor 6 and is set to its original state. The response time of the counter 11 should be equal to the transit time of the shortened signal through the block 10. The execution of the block of series-connected delay lines 10 is presented in the mentioned patents No. 2501036 and No. 2195686. The delay time of a signal by one line can be 1 ns. The output of each delay line of block 10 is connected to the corresponding element of the block of matching elements 5. A shortened signal from the matching element 4 is received to the other inputs of the matching elements of this block. Counter 11 provides in-depth current information about the period between two signals to the first group of inputs of the secondary processing unit 1, and the second group of inputs receives clarifying information from a certain coincidence scheme of a block of coincidence elements 5. It depends on which circuit will work when it is simultaneously received at its input q signals from block 10 and from element 4 matches.

In the proposed device decreases the volume of the counter, which reduces cumbersome. The secondary processing unit 1 provides tracking periods, eliminates false and interfering periods and can operate in multi-period mode. It also takes into account the systematic correction associated with the response time of sensors 2 and 6 and the element OR 9. An example of a specific implementation of the secondary processing unit is presented in the book V.P. Pestryakov. and others. "Radio systems", 1985, p. 219. The proposed device can be used in radio systems, where temporary mismatches are determined, and in range converters.

Claims (1)

A device for measuring a small time interval, consisting of a sensor of the first signal, a sensor of the second signal and an OR element, a block of series-connected delay lines, a counter, a block of coincidence elements, and a secondary processing unit, where the output of the OR element is connected to the input of the counter and to the input of the block in series delay lines having a group of outputs connected to a group of inputs of a block of matching elements having a group of outputs connected to a second group of inputs of a secondary processing unit having a first th group of inputs connected to the group of outputs of the counter, characterized in that two high-speed triggers are introduced with initialization and two coincidence elements, while the output of the first signal sensor is connected to the first input of the first coincidence element and to the first input of the first high-speed trigger with installation in the initial state, the output of which is connected to the second input of the first matching element having an output connected to the first input of the OR element having a second input connected to the output of the block of delayed lines connected in advance, and the output and input of the second quick-acting trigger with initialization are respectively connected to the second input of the second coincidence element and to the output of the second signal sensor, also connected to the first input of the second coincidence element having an output connected to the input of the coincidence element block .

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