SU741460A1 - Device for converting signal phase modulation into digital code - Google Patents

Description

DESCRIPTION OF THE INVENTION <11) 741460

Union of Soviet Socialist Republics

State Committee

USSR for inventions and discoveries

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate (22) Claimed 04.04.75 (21) 2121885 / 18-21 with the addition of application No. (23) Priority

Published on June 15, 0.80. Bulletin No. 22

Date of publication of the description 16.06.80 (51) M. CL *

H 03 K 13/20 (53) UDC621.317.

.373 (088.8) (72) The inventors

L. I. Dedyulina, Yu. M. Kiselev and G. A. Stolyarova (71) Applicant (54) DEVICE FOR CONVERTING SIGNAL PHASE MODULATION TO DIGITAL CODE

The invention relates to computer technology, to phase-to-code converters.

In modern radio signals are phase-modulated in a maximum change in the Optional ⁵ PS significantly above the phase unambiguity interval 23C transmission and conversion information systems are widely used.

Known phase-to-code converters, constructed on the principle of converting the phase shift to a time interval and filling this interval with counting pulses. Devices for converting phase into a digital code have signal and reference voltage conditioners connected via a logic circuit to the control unit and the first matching circuit controlling the generator counting pulses, counter, a second coincidence circuit, the first input of which is connected to the driver voltage reference _m , the second to the counting pulse generator, and the output to a trigger with separate inputs, to the second input of which a pulse2 output of the trigger with a counting input is connected, is connected to the third matching circuit, the other input of which is connected through the differentiating circuit to the output of the control unit, and the output is connected through the trigger with the counting input to the fourth matching circuit , the second input of which is connected to the output of the first matching circuit, the third input is connected to the output of the signal conditioner, and the output is connected to the second input of the counter pulse generator, while between the output of the counter counter sov and the inlet counter is enabled for two divider * [1].

However, such converters work only within the single-phase phase, i.e. in the interval of phase change 0-2JV, and therefore, are not used to convert phase-modulated signals with phase deviation greater than 31 to code.

The purpose of the invention is to increase the accuracy of the conversion of the instantaneous value of the phase modulation law with a maximum phase change greater than 3T.

7414G0

This goal is achieved by the fact that in a device containing time stamps of phase-modulated and reference signals, two co-control elements and a reversible counter, a controllable frequency divider, a first pulse shaper of a given duration, a differentiating circuit, and a second pulse shaper of a given duration are introduced at!

the outputs of the pulse shapers of a given duration are connected to the inputs of two coincidence elements, the second inputs of which are connected to the output of the shaper of the time stamps of the phase-modulated signal], and the output of the first coincidence element is connected to the subtracting input of the reversible counter and the first control input of the controlled divider, the output of the second coincidence element connected to the summing input of the reversible counter and the second control input of the controlled divider, the input of the controlled divider is connected to the output driver of the time stamp of the reference signal.

In FIG. 1 shows a functional diagram of a device; in FIG. 2 (a, b) shows the timing diagrams of the operation of the device for cases of increase and decrease-dψγ phase in the input signal; in FIG. Figure 3 shows graphical dependencies explaining the transformation of the phase modulation law into a time-variable digital code.

The device consists of a shaper 1 of short pulses, the output of which is connected to the inputs of the elements 2 and 3 matches. The second input of the coincidence element 2 is connected to the output of the series-connected shaper 4, the divider 5 with a variable division coefficient, the pulse shaper 6 of a given duration, the output of which is connected through a series-connected differentiating circuit 7 and the pulse shaper 8 of a given duration to the second input of the coincidence element 3. The output of the coincidence element 2 is connected to the control input of the divider 5 and the subtracting input of the reversing counter 9. The output of the coincidence element 3 is connected to the control input * + * of the divider 5 and to the summing input of the reversing counter 9. The output of the counter 9 is the output of the device.

The operation of the device is illustrated by timing diagrams (Fig. 2a, b, where the letters indicate the signals at the corresponding points in the circuit of Fig. 1).

The input phase-modulated signal with a frequency of LU is converted by the driver 1 at zero transitions (positive or negative) into a sequence of short pulses 'a, which on coincidence element 2 and 3 are compared in time position with pulses b *) and' c, respectively. The pulses b and 'c * are formed from a reference signal of frequency nUJ, which is converted into a sequence of short pulses' g * and divided by a divisor 5 by η if there are no pulses at its 5 control inputs ^β - ^ν and' Ч. The factor of division of the healer will increase by one and becomes AND + 1 for one division cycle, if pulse 3 arrives at the control input + and becomes ^ -1 for one division cycle, if the pulse arrives at the control input. Thus, when a control pulse arrives at input +, for the appearance of the next pulse at the output of the divider, +1 input pulses will be required, when a control pulse arrives at the input for the appearance of the next pulse at the output, Π -1 input pulses are required. As a result of controlling the division factor, the reference pulses of the frequency LU are received from the former divider 5 to the shaper 6, the phase of which changes by + 4H> upon receipt of the control pulse at the input of the divider 5 and if the control pulse arrives at the input, the control phase of the reference pulses is achieved. These reference pulses are converted by the shaper 6 into pulses of a given duration b supplied to the second input of the coincidence element 2, and pulses b through the differentiating circuit 7 by a similar shaper 8 are converted into pulses of a given duration c supplied to the second input of the coincidence element 3 so that the trailing edge pulse b corresponds to the leading edge of the pulse c. The pulses a, when the phase increases in the phase-modulated signal, catch up with pulse b on the coincidence element 2, at the output of which a pulse * e appears, writing -1 to the counter and decreasing by 1 the division factor of divider 5 for one division cycle. The next reference pulse d 'and, correspondingly, the pair of reference pulses b and c receive sdv'A-dTs ”and the subsequent pulse a, formed from the input phase-modulated signal, matches the pulse' in 'on coincidence element 3, the output pulse x, which records +1 to the reverse counter 9 and increases by +1 to 5 the factor of division of the healer 5 as a result of which the reference pulses 'd' and, accordingly, * b and 'c' receive a phase shift

4-dh *. Since the phase in the input signal increases la + dc> _m over the period of the carrier frequency 10, the next pulse 'a' will coincide with the pulse in coincidence element 3. This process is repeated until the phase displacement rate of the input pulses 'a does not exceed the displacement speed 15 of the reference pulses d' and, accordingly, b and c. In this case, pulses are received at the summing input of the reverse counter 9, each of which increases by +1 the number recorded in 20 it. When the phase in the input signal decreases, the processes in the device are similar and are shown in FIG. 26. For the entire set of input phase-modulated narrow-band signals, it is possible to determine the maximum phase shift from period to period of the carrier frequency ^ ^{if BbI} ”, take the phase shift by changing the frequency division coefficient of the divider 5 ί equal to q C> - Δ × ⁵ ^ ^, then the conversion of the 30 law of phase modulation into a time-variable digital code is unique for the entire range of input signals. The step of discrete dependences along the abscissa axis is equal to the period of the carrier frequency T, along the 35 axis, along the η axis (O is unity (Fig. 31.

The device unambiguously converts all phase-modulated signals having a phase change from period to period not more than 40 AH '. If the choice of Δ4 ' _{Νιακ €} is determined by the signal parameters, and not by the device’s parameters, then it provides an unambiguous conversion of the phase modulation law into a time-variable digital code for all phase-modulated signals used in radio engineering.

For stable operation, the pulse durations b and c should be taken with a margin of 1.5 times, taking into account the randomness of the appearance of the input signal 'C "4.5 where T =

- period of the input signal,

Claims (1)

The invention relates to computing, to phase-to-code converters. In modern radio technology in the transmission and conversion systems, phase-modulated signals with a maximum phase change significantly exceeding the phase unambiguity 201: are widely used. Phase-to-code converters are known that are constructed according to the principle of converting a phase shift into a time interval and filling this interval with counting pulses. The devices for converting phase to digital code have signal and reference voltage drivers connected via a logic circuit to the control unit and the first coincidence circuit, which controls the counter pulse generator, the second coincidence circuit, the first input of which is connected to the reference voltage driver, the second to the generator of counting pulses, and the output through a trigger with separate inputs, to the second input of which a pulse output of the trigger with a counting input is connected, is connected to the third coincidence circuit, the other in the stroke of which is connected via a differentiating target to the output of the control unit, and the output through a trigger with a counting input is connected to the fourth coincidence circuit, the second input of which is connected to the output of the first coincidence circuit, the third input is connected to the output of the signal conditioner, and the output is connected to the second input the generator of counting pulses, while between the output of the generator of counting pulses and the input of the counter a divider is turned on by two i. However, such converters work only within the unambiguous phase, i.e. in the phase change interval, n, therefore, for the conversion of phase-modulated signals with phase deviation to the code, no more F are used. The purpose of the invention is to improve the accuracy of conversion of the instantaneous value of the law of phase modulation with a maximum phase change greater than L. The postputilization goal is achieved by the fact that in the device containing || given duration, while the outputs of the pulse shapers of a given duration are connected to the inputs of two elements of coincidence, the second inputs of which are connected to the output the driver of the time stamps of the phase-modulated signaling and the output of the first coincidence element is connected to the subtractive input of the reversible counter and the first control input of the controlled divider, the output of the second coincidence element is connected to the summed input of the reversible counter and the second control input of the controlled divider, the input of the controlled divider is connected to the input of the time stamp generator of the reference signal Fig. 1 is a functional diagram of the device; in fig. 2 (a, b) shows the time diagrams of the operation of the device for the cases of increase in + LR and decrease in the MF phase in the input signal; in fig. Figure 3 shows the graphical dependences explaining the transformation of the law of phase modulation into a time-varying digital code. The device consists of a short pulse output generator 1 of which is connected to the inputs of elements 2 and 3 from the fall. The second input of the coincidence element 2 is connected to the output of a serially connected driver 4, a divider 5 with a variable division factor, a driver 6 of pulses of a given duration, the output of which is sequentially connected through a differentiating circuit 7 and the driver of pulses of a given duration connected to the second input of the coincidence element 3. The output of the coincidence element 2 is connected to the control input of the divider 5 and the subtractive input of the reversing counter 9. The output of the coincidence element 3 is connected to the control input + of the divider 5 and to the summing input of the reversible counter 9. The output of the counter 9 is the output of the device. The operation of the device is illustrated by timing diagrams (Fig. 2n, b, where the letters indicate the signply at the corresponding points of the circuit of Fig. 1). The input phase-modulated signal with frequency (jj is transformed by shaper 1 through zero crossings (positive or positive) into a sequence of short pulses a, which on element 2 and 3 are matched compared to the temporal position 1-1 by pulses b and c respectively. Pulses b and c are formed from the reference of the signal frequency nu), which is converted into a sequence of short pulses r and is divided by a divider of 5 pas n, if its control inputs are - and + there are no pulses. and it becomes t 4-1 for one division cycle if a pulse arrives at the control input + and becomes -1 for one division cycle if the pulse arrives at the control input - Thus, when the control impulse arrives at the input + for the appearance of the next pulse at the output of the divider will require n +1 input pulses, when a control pulse arrives at the input, for the appearance of the next pulse at the output, P -1 input pulses are required. As a result of controlling the coefficient of division from the output of the divider 5, the shaper U receives frequency reference pulses U.) "the phase of which changes to + 4 D when the control pulse arrives at the input + divider 5 and per-DM, if the control pulse arrives ia the input is - thus the control of the phase of the reference pulses is achieved. These reference pulses are transformed by shaper 6 into pulses of a given duration b, supplied to the second input of element 2, and pulses are b through differentiated; circuit 7 with a similar shaper 8 is converted into pulses of a given duration, fed to the second input of coincidence element 3 so that the back pulse front b corresponds to the leading edge of the pulse c. When the phase increases in the phase-modulated signal, the pulses catch the impulse b on the coincidence element 2, at the output of which a pulse e appears, recording -1 to the reversible counter and decreasing the divider 5 by 1 division cycle. The next reference pulse g and, respectively, a pair of reference pulses: b and c receive) and the subsequent imgulsa, formed from the input fpsomodular signal, coincides with the pulse in on the coincidence element 3, the output nctpuls, which writes to the reversible counter 9 l by +1, the division ratio of healer 5 is as a result of which the reference pulses g and, respectively, b and c receive a phase shift. Since the phase in the input signal is increasing by h-dM over the period of the frequency-carrying frequency, the next pulse will coincide with the pulse in on element 3 of the day. This process is repeated until the phase displacement rate of the input pulses a does not exceed the displacement speed of the reference pulses d and, respectively. At the same time, the summing input of the reversing counter 9 receives pulses, each of which increases by +1 the number written in it. When the phase in the input signal decreases, the processes in the device are similar and are shown in FIG. 26. For the entire set of input phase modulated narrowband signals, it is possible to determine the maximum phase shift from period to period of carrier frequency, i select the phase shift by changing the divider frequency division factor 5 equal to l C - D, (5,, Then the transformation of the phase modulation law into a time-varying digital code is unique for the entire range of input signals. The step of discrete dependencies along the abscissa axis is often the carrier period s T, along the H axis () ° (O - unit (Fig. 3; ;. The device uniquely converts all phase-modulated signals having a phase change from period to period not more than the AFL. If the choice of AMi is determined by the signal parameters, and not device parameters, it provides an unambiguous conversion of the law of phase modulation into a time-varying digital code dsh of all signals with phase modulation used in radio engineering. For stable operation, the duration of infrared pulses b and k must be taken with a margin of 1.5 times, taking into account the occurrence of Input signal x - .. |, where T is the period of the input signal. Apparatus of the Invention A device for converting a phase modulus of a signal into a digital code containing time stamps of a phase modulated and a reference signal, two coincidence elements and a reversible counter, from which, in order to improve accuracy, it additionally introduces a sequentially connected controlled frequency divider , the first pulse shaper of a given duration, the differentiating circuit, the second pulse shaper of a given duration, while the outputs of the pulse shapers of a given duration are connected to the inputs of two coincidence elements, the second inputs of which are connected to the output of the time stamper of the phase-modulated signal, and the output of the first coincidence element is connected to the subtractive input of the reversible counter and the first control input of the controlled target, the output of the second element from the event is connected to the summing input reversible counter and the second control input of the controlled divider, the input of the controlled divider is connected to the output of the time stamp generator op polar signal. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 448596, cl. H 03 K 13 / 2O, 1974. but -eight TC / + .r). H%)) ± F п-ц 4 "  T 4 iiiiii itz 1 i eleven one I Fig 2  n-f n-f f f 1Ш1ШШШШШШШШШШШШШ | Д t f / gi11tdllllig1-DU,  ttffc Phiaz d% Aquatic  0 -Duma s: l g