SU756348A1 - Digital meter of time intervals - Google Patents

Description

The invention relates to radio measurements and can be used in radio navigation, radiolocation and other areas of radio electronics as a digital meter of time inter-shafts.

Known meter time intervals, containing the generator, counter, logic elements, the recording device [1], 1

The disadvantage of the meter is the presence of elements with a speed greater than the limiting operating frequency of standard microelectronic elements. one

Also known is a digital time interval meter containing a η-stroke pulse generator of the reference frequency, the outputs of which are connected to the inputs of the control circuit, an output modulo-two addition circuit, the output of which is connected to the input of a recording counter [2].

However, the known digital meter of time intervals does not provide an increase in measurement accuracy by η times for η 4.

The purpose of the invention is to improve the measurement accuracy.

2

The goal is achieved by the fact that the well-known digital meter of time intervals contains η input counting cells, n / 2 modulo addition circuit, n / 2 additional counting cells, two X schemes and two output counting cells, the outputs of which are connected to the inputs of the output addition circuit module two, the inputs of the output counting cells are connected to the outputs of the AND circuits, the inputs of the same AND circuit are connected to the straight lines, and the inputs of the other to the inverse outputs of the additional counting cells, the inputs of which are connected to the outputs of the adders modulo two, each of which x connected to the outputs of two input countable cells, while the latter inputs connected to outputs of the control circuit.

The drawing shows a diagram of a digital meter time intervals.

The digital time interval meter contains a η-stroke generator of 1 pulses of the reference frequency, control circuit 2, output modulo 2 addition circuit 3, registering counter 4, input counting cells 5, modulo addition circuit 6

756348

four

Liu two, additional counting cells 7, circuits 8 and 9 AND, output counting cells 10 and 11.

The device works as follows

in a way.

At the moment of arrival of the start-pulse, which sets the beginning of the time interval to the control circuit 2, quanta appear on the outputs of the latter, pulses of the oscillator 1 of the reference frequency, which are fed to the inputs of the input counting cells 5. From the outputs of each pair of output cells 5, to the inputs of which antiphase generator 1 pulses of the reference frequency are fed, signals are fed to the inputs of modulo b addition circuits, which add these logic signals and at the moment of their coincidence they form transfer pulses into additional counting cells yki 7. Signals from direct and. inverse outputs of the Additional counting cells 7 are received respectively on the scheme 8 and 9 I.

Scheme 9 generates the transfer signals in the output counting cell 11 after switching all four input counting cells 5 from state "0" to state "1". Circuit 8 generates a transfer signal to the output. Counter cell 10 after switching all input counting cells from state “1” to state “0.” From the outputs of counting cells 10 and 11, the signals arrive at the inputs of the output modulo-2 output circuit 3, the logic signal whose output changes from "0" to "1" or from "1" to "0" after each successive switching of all input counting cells from the state "0" to · "1" or vice versa from "1" to "0", regardless of the order of receipt of the pulses of the reference frequency generator 1. The transfer pulse at the output of the output circuit 3 is complex Ia modulo two to the registration counter 4 generated after registration eight quantizing input pulses countable cells · 5. When entering the control circuit 2 stop ympulsa defining the end of the time interval,

the latter prohibits the supply of quantizing impulses of the oscillator 1 of the reference frequency to the inputs of the input counting cells 5. The measurement result is recorded by the registering counter 4., If there is a "0" at the output of the output modulo 3 output two, the result is determined by summing the values of all input counting cells 5 that are in the state "1", and in the presence of "1" the result is determined by summing the values of all input counting cells 5, which are in the state "0".

Claims (2)

Claim A digital time interval meter containing an p-stroke pulse generator of the reference frequency, the outputs of which are connected to the inputs of the control circuit, an output addition circuit modulo two, the output of which is connected to the input of the recording counter, which is measurement accuracy, η input counting cells are entered into it, η / 2 modulo addition circuits, η / 2 additional counting cells, two And schemes and two output counting cells, the outputs of which are connected to the inputs of the output adherent modulo two, in odes of the output counting cells are connected to the outputs of the AND circuits, the inputs of one AND circuit are connected to the straight lines, and the inputs of the other with the inverse outputs of the additional counting cells, The inputs of which are connected to the outputs of the addition schemes modulo two, the inputs of each of which are connected to the outputs of the two input counting cells, while the inputs of the latter are connected to the outputs of the control circuit. Sources of information taken into account in the examination 1. USSR author's certificate number 325700, cl. С ОА Г .10 / 00,1970 2. USSR author's certificate No. 438998, cl. 0 0A P 10 / 0.0, 1974 (prototype). 756348 sta.ot Stop