SU1007054A1 - Code-to-time interval converter - Google Patents

Abstract

TEMPORARY INTERVAL CODE CONVERTER, containing a series-connected counting pulse generator, an AND element and a counter, a decoder whose input is connected to the counter output, a time interval code sensor whose outputs are connected to the corresponding counter inputs, a trigger whose first input is an input of the code converter in the time interval that differs in that. that, in order to improve the accuracy of converting code to time interval, a digital controllable delay line is inputted to it, the input of which is connected to the output of the descrambler and the second trigger of the trigger, and the output is the output of the time converter of the code converter connected in series to the inverter whose input connected to the input element And, the trigger delay, the second input and the output of which are connected respectively to the first output of the trigger and the second input of the element And, the time discriminator, the second input of which is connected to the second trigger output, §, and the time interval converter to the code, the outputs of which are connected (L to the corresponding control inputs of the digital controlled delay line.

Description

J

Buxoi

SP

4ib I The invention relates to radio engineering, in particular, to radiolocation and radio navigation, and can be used in measuring calibration equipment to form a time delay signal proportional to the distance to an object. A known converter of a code into a time interval, containing a series-connected counting pulse generator, an And element and a counter, a decoder, the input of which is connected to the output of the counter, a sensor of the time interval code, the outputs of which are connected to the corresponding inputs; counter, trigger, the first input of which is the input of the converter code in the time interval l. However, the well-known code-to-time converter does not provide sufficient accuracy of code-to-time conversion, since it does not eliminate the interruption error caused by the out-of-phase impulses of the counting oscillator and the start-up impulse of the time interval. The purpose of the invention is to improve the accuracy of code conversion to a time interval. The goal is achieved by the fact that in the converter, containing consistently the generator of counting pulses, the element And and the account: tick, decoder, the input of which is connected to the output of the counter, the sensor of the code of the time interval, the outputs connected to the corresponding inputs of the counter, trigger, the first the input of which is the input of the code converter in the time interval, a digital controlled delay line is introduced, the input of which is connected to the output of the decoder and the second input of the trigger, and the output is the output of the conversion code slot in time interval, connected in series with inverter, input of which is connected to input of element And, trigger of delay, second input and output of which are connected respectively with first output of trigger and input of element And, time discriminator, second input of which is connected with second trigger output / and time converter to the code whose outputs are connected to the corresponding control inputs of the digital controlled delay line. FIG. 1 shows the structural electrical circuit of the proposed code converter in the time interval J in FIG. 2 - eshora voltage. The code converter in the time interval contains the generator 1 counting pulses, trigger 2, inverter 3, element 4, delay 5 trigger, sensor 6 of the code of the time interval, counter 7, time discriminator 8, converter 9 time-to-code into the code, decoder 10 and digital control line 11 delay. The Converter code in the time interval works as follows. In the initial state of the code converter in the time interval, trigger 2 is in the zero state, which corresponds to a low voltage level at its first output and a high voltage level at its second output. The low voltage level further corresponds to the zero level, and the high to the single level. A low voltage level from the first output of the trigger 2 arrives at the second information input of the delay 5 trigger, and a high voltage level from the second output of the delay 5 trigger arrives at the second input of the temporary discriminator 8, performed, for example, on the logical element OR NOT. A low zero voltage level is written to the delay trigger 5 by the counting pulses of the oscillator 1 supplied through the inverter 3 to the first clock input of the delay trigger 5 (Fig. 2a, 6J. The zero voltage level and the output of the delay trigger 5 goes to the second input of the And element 4 and re passes the counting pulses of the oscillator 1 of the counting pulses (Fig. 2a) through this to the counting input of the counter 7. At the time the code converter enters the input of the time interval of the start pulse (Fig. 2k), the trigger 2 is set to one state to The high voltage level at the first output and the low voltage level at the second output correspond to the order (Fig. 2B and d). The unit voltage level is fed from the first output of trigger 2 to the second information input of delay trigger 5 and is recorded at its output closest in time a positive voltage drop at its first clock input Gfg.- .. Signals acting on the inputs of the time discriminator 8 (fig.2d, d) form at its output a pulse of duration) r, which (fig. 2fe) can vary from 0 to to / gdes, there is a period of the counting pulses of the generator 1, and which is a result of the asynchronism of the start pulses and the counting pulses. High voltage level r recorded in delay 5 trigger open w CinnGin A.n Jk Jt -J V 1. - element. And 4, (fig. 2g), and counting pulses from the generator 7 are fed to the input of the meter 7 from the output of the generator 1. These counting pulses fill the counter. The initial state of the bits of the counter 7 before the start of the pulse counting is determined by the sensor 6. of the time interval code so that at any given time interval the final state of the bits of the counter 7 remains the same and in which the decoder 10 generates an output pulse (Fig. 2h). This impulse arrives at the second input of trigger 2 and translates trigger 2 and trigger 5 delays to the original, composed% 1n. Thus, within the time limit, limited by the duration of the single state of the trigger 5 delay, the counter summarizes the time intervals of the duration tg. The total time interval is determined by the accuracy and stability of the frequency of the oscillator 1 counting pulses and, in addition, it contains the time interval & t. In order to reduce the influence of the time interval Ai on the accuracy of the code conversion in the time interval, the pulse selected at the output of the time discriminator 8 is fed to the converter 9. the time interval to the code / which {1y and converts the pulse duration to a digital code From the outputs of the converter 9 to the control inputs of the digitally controlled delay / coaxial line 11, the output pulse of the decoder 10 is frozen at (c - at) FIG. 2i) .. Formed by the code converter in the time interval is determined by the expression., And) where N is the number of counting pulses (which must be fed to the input of counter 7 to trigger the decoder 10. From expression (1) it can be seen that tg "NHl-" . Thus, the time interval tg between the moments of arrival at the input of the code converter in the time interval of the start pulse and the moment of appearance of the pulse at the output of the converter (Fig. 2x) ideally does not contain a variable component L, which confirms the achievement of the proposed object with a positive effect. The converter 9 of the time interval into the code used in the proposed code converter in the time interval can be implemented, for example, in the form of a recirculation converter. The technical and economic effect of the proposed transducer of the code into the time interval consists in ensuring a high accuracy of tuning the radar and radio radars (RV devices measuring the distances to objects, i.e. ensuring the reliability of the measurements they make.

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Claims (1)

CODE TRANSFER IN THE TIME INTERVAL, containing a counting pulse generator connected in series, an And element and a counter, a decoder whose input is connected to the counter output, a time interval code sensor whose outputs are connected to the corresponding counter inputs, a trigger, the first input of which is the input of the code converter into time interval, characterized in that. that, in order to increase the accuracy of converting the code into a time interval, a digital controlled delay line is introduced into it, the input of which is connected to the decoder output and the second trigger input, and the output is the output of the code converter to the time interval, the inverter connected in series, the input of which is connected to the input element And, a delay trigger, the second input and output of which are connected respectively to the first output of the trigger and the second input of element And, a temporary discriminator, the second input of which is connected to the second output trigger trigger, _e and a time-to-IB shaft-to-code converter, the outputs of which are connected * to the corresponding control '(inputs of the digital controlled line *' l delay. 'V Fig 1