# Digital device for measuring transport lateness of signal in communication equipment and technology

FIELD: measuring equipment.

SUBSTANCE: device has harmonic signals generator, synchronization pulse generator, counter, rectangular pulse generator, key, quadrature demodulator block, digital block for adjusting synchronization phase, analog-digital generator of tone frequencies signals, three ADC, three buffer registers, three digital filters, five multiplexers for temporal division, six arithmetical subtracter-adders, six arithmetical multiplication blocks with accumulation, microprocessor set with input and output data registers, data processing block, micro-programmed control block and synchronous pulse generator and indication block.

EFFECT: higher precision, higher efficiency, broader functional capabilities.

1 dwg

The invention relates to communication technology, such as technology and practice of measurement in a circuit-switched channels of information transmission networks.

Multi-frequency broadband signal passing through the circuit-switched communication channels, distorted, because different frequency components are delayed by different times. A significant disadvantage of the known circuits digital phasemeter [1. Metrology, standardization and measurements in communications technology. Edited by B.P. Lame. Moscow, Radio I Svyaz, 1986] is a great time of measurement, depending on the frequency of the analyzed signal, the transition process of the test channel and the limited accuracy in the presence of industrial interference.

It is known device [2. Auth. the certificate of USSR No. 1609328 (TM), G 06 G 7 / 19th, G 01 R 25/00, publ. 23.12.1988,], which determines the phase shift of the two harmonic signals, such as voice frequency signals in telephony with arbitrary sample rate and frequency. Improving the accuracy of measuring the phase characteristics of the complex, in the General case of nonlinear components of communication equipment is achieved by the fact that there is no need to scale the step of sampling the signals at the output of the two analog-to-digital converters (ADC), to determine the corner frequency ω studied harmonic signals. The measurement accuracy of the phase shift increases by eliminating arithmetic nl the Cove calculation and storage of the sinuses, cosines and scaling, as well as the appropriate choice of measurement interval, which may be adaptive, which increases the noise immunity. The disadvantages of these devices include restrictions on the form of the test signal. In addition, it cannot be applied to other modulation types.

Closest to the proposed device for the adaptive adjustment of the parameters of the dynamic characteristics of complex nonlinear and non-stationary radio systems that contain electronic components with both analog and digital signals [3. Pat. Russia №2187140, G 05 B 13/00, H 03 D 3/02, publ. 10.08.2002,] that contains the generator of the harmonic signals of the reference frequency reference pulse shaper synchronization counter, square wave pulser, digital control of phase synchronization, the output of which is connected to the reference input of the phase generator of rectangular pulses, the output of which is connected through the key signal to the information input of the quadrature demodulator, the first generator output harmonic signals of the reference frequency is connected with the first common-mode input quadrature demodulator and a pulse shaper connected to the input of the counter, while the second generator output harmonic signals of the reference frequency is connected with the second input of the quadrature demodulator, in formazione inputs of the first and second buffer registers are measurement inputs for connection respectively to the outputs of the first and second ADC, the first and second digital IIR filters connected to the outputs of the first and second buffer registers, respectively, the inputs of the first and second multiplexer connected to the first, second and third outputs of the respective digital IIR filters, and the outputs of the first and second multiplexer to the input of arithmetic adders-vychitala, the first control output of the microprocessor kit is connected to the reset input in the initial state of the digital control unit of the synchronization phase, the second input is connected to the second control output of the microprocessor package, the output of the pulse shaper is connected to the synchronization input of microprocessor kit, the total output synchronization which is connected to the corresponding inputs of the synchronization buffer registers, IIR filters, multiplexers and arithmetic adders-vychitala, third, fourth and fifth control outputs of the microprocessor sets connected with corrective inputs of the first digital IIR filter, sixth, seventh and eighth control outputs of the microprocessor sets connected with appropriate corrective inputs of the second digital IIR filter, the ninth control output of the microprocessor kit is connected to the control input of the display unit.

The disadvantages of this device can what about attributed to random measurement error of the transportation lag e^{
-τ}T^{S}signals on a limited observation interval, for example, online diagnostics and commissioning of complex radio systems, in normal operation when exposed to industrial noise General form, including pulse; unsteady on the observation interval, etc. This error in the known device, selected as a prototype, decreases the optimal choice and correction of digital IIR filters, however, when the reduction ratio of useful signal to noise becomes noticeable for engineering practice.

The present invention is directed to improving the accuracy of measurement of the transport delay of signals in technology and communication technology. Technical result achieved when this task is complete compensation of the random error of measurement of the sign and magnitude of ±τ_{T} ^{*}for example, for a signal tone frequencies, and signals with other types of modulation such as PCM.

This is achieved by the fact that in the known device, comprising a generator of harmonic signals of the reference frequency reference pulse shaper synchronization counter, square wave pulser, digital control of phase synchronization, the output of which is connected to the reference input of the phase of the square wave pulser, o is d through which the key is connected to the signal information input quadrature demodulator, the first generator output harmonic signals of the reference frequency is connected with the first common-mode input quadrature demodulator and a pulse shaper connected to the input of the counter, while the second generator output harmonic signals of the reference frequency is connected with the second input of the quadrature demodulator, the information inputs of the first and second buffer registers are measuring inputs for connection respectively to the outputs of the first and second ADCS, the first and second digital IIR filters connected to the outputs of the first and second buffer registers, respectively, the inputs of the first and second multiplexer connected to the first, second and third outputs of the respective digital IIR filters, and the outputs of the first and second a multiplexer to the input of arithmetic adders-vychitala, the first control output of the microprocessor kit is connected to the reset input in the initial state of the digital control unit of the synchronization phase, the second input is connected to the second control output of the microprocessor package, the output of the pulse shaper is connected to the synchronization input of microprocessor kit, the total output synchronization which is connected to the corresponding inputs of the synchronization buffer registers, IIR filters, multiplexers and arithmetic su the engine-vychitala, the third, fourth and fifth control outputs of the microprocessor sets connected with corrective inputs of the first digital IIR filter, sixth, seventh and eighth control outputs of the microprocessor sets connected with appropriate corrective inputs of the second digital IIR filter, the ninth control output of the microprocessor kit is connected to the control input of the display unit, the entered analog signal generator tone frequency, the first input connected to the second output key, the second with the first control the output of microprocessor kit, and the third input to the second control the output of microprocessor kit, the third multiplexer, two inputs of which are connected to the outputs of the quadrature demodulator, and two others with the analog outputs of the signal generator tone frequency, the first output of the third multiplexer is connected to the input channels of communication and to the input of the first ADC and the second output to the input of the second ADC, the output channels of a connected series circuit of the third ADC, the third buffer register, the third digital IIR filter, correcting the input of which is connected with the tenth, eleventh and twelfth control outputs of the microprocessor kit, and the fourth multiplexer, three entrances to the which is attached to the three respective outputs of the third digital IIR filter, and nine outputs of the second, third and fourth multiplexer pairs are connected to corresponding inputs of a six arithmetic adders-vychitala, the output of the first arithmetic adder-vicites connected to the first input of the first arithmetic unit multiplication with accumulation, the output of the second arithmetic adder-vicites connected to a second input of the first arithmetic unit multiplication with accumulation, the first and second inputs of the second arithmetic unit multiplication with accumulation and the first input of the third arithmetic unit multiplication with accumulation, the output of the third arithmetic adder-vicites connected to a second input of the third arithmetic unit multiplication with accumulation, the fourth arithmetic adder-vicites connected to the first the fourth input of arithmetic block multiplication with accumulation, the output of the fifth arithmetic adder-vicites connected to a second input of the fourth arithmetic unit multiplication with accumulation, the first and second inputs of the fifth arithmetic unit multiplication with accumulation and the first input of the sixth arithmetic unit multiplication with accumulation, and the output of the sixth arithmetic adder-vicites connected to a second input of the sixth arithmetic unit multiplication with accumulation, the outputs of the first, second and Proc. of the third arithmetic units multiplication with accumulation connected with the corresponding inputs of the fifth multiplexer, the output of which is connected to the first information input of the microprocessor unit, and the outputs of the fourth, fifth, and sixth arithmetic units multiplication with accumulation connected respectively to the inputs of the sixth multiplexer, the output of which is connected with the second information input of microprocessor kit, and the total output synchronization microprocessor kit is connected to the corresponding inputs synchronization of all multiplexers, digital IIR filters, arithmetic adders-vychitala, arithmetic units multiplication with accumulation, and the entrance and exit channels of communication are input and output devices.

The drawing shows a block diagram of the device.

Digital device for measuring the transport delay signal comprises a generator 1 harmonic signals (thermally stabilized, quartz, reference frequency shifted by 90° (reference oscillator), the shaper pulse synchronization 2, a counter 3, a square-wave generator 4, key 5, block quadrature demodulator 6, a digital block 7 of the regulation phase synchronization, two analog-to-digital Converter (ADC) 8, 9, the first and second buffer registers 10, 11, information inputs which are measuring inputs for connecting the respective outputs of the ADCS, the first and the Torah multiplexers 12 and 13 time division switching channels, the first and second digital IIR filters 14 and 15, first and second arithmetic adders-myCitadel 16, 17, connected to the first inputs of the first and second output multiplexer 12, respectively, to analog generator 18 signal tone frequency, the first input connected to the second output of the key 5, the third multiplexer 19, two inputs of which are connected to the outputs of the quadrature demodulator 6, and the other two with analog outputs of the generator 18 of the tone signals of frequencies, the first output of the third multiplexer 19 is connected to the input of the investigated channel 20 and to the input of the first ADC 8 and the second output to the input of the second ADC 9, the output of the investigated channel 20 is connected a series circuit of the third ADC 21, the third buffer register 22, the third digital IIR filter 23 and the fourth multiplexer 24, the three inputs of which is connected to three respective outputs of the third digital IIR filter 23, and nine outputs of the second, third and fourth multiplexer 12, 13, 24 pairs connected to corresponding inputs of a six arithmetic adders-vychitala 16, 17, 25, 26, 27, 28, the output of the first arithmetic adder-vicites 16 connected to the first input of the first the arithmetic unit multiplication with accumulation 29, the output of the second arithmetic adder-vicites 17 is connected to a second input of the first and ipotechnogo block multiplication with accumulation 29, the first and second inputs of the second arithmetic unit multiplication with accumulation 30 and the first input of the third arithmetic unit multiplication with accumulation 31, the output of the third arithmetic adder-vicites 25 is connected to a second input of the third arithmetic unit multiplication with accumulation 31, the output of the fourth arithmetic adder-vicites 26 connected to the first input of the fourth arithmetic unit multiplication with accumulation of 32, the output of the fifth arithmetic adder-vicites 27 is connected to a second input of the fourth arithmetic unit multiplication with accumulation of 32, first and second inputs of the fifth arithmetic unit multiplication with accumulation 33 and the first input of the sixth arithmetic unit multiplication with accumulation 34 and the output of the sixth arithmetic adder-vicites 28 is connected to a second input of the sixth arithmetic unit multiplication with accumulation 34, the outputs of the first, second and third arithmetic units multiplication with accumulation 29, 30, 31 are connected to the corresponding inputs of the fifth multiplexer 35, and outputs the fourth, fifth, and sixth arithmetic units multiplication with accumulation 26, 27, 28 connected respectively to the inputs of the sixth multiplexer 36, the outputs of the fifth and sixth multiplexers 35, 36 are connected with the first and second information inputs of microprocessor kit 3, the total synchronization microprocessor kit is connected to the corresponding inputs synchronization of all multiplexers 12, 13, 19, 24, 35, 36, digital IIR filters 14, 15, 23, arithmetic adders-vychitala 16, 17, 25, 26, 27, 28, arithmetic blocks the multiplication with accumulation 29, 30, 31, 32, 33, 34, microprocessor kit 37 containing input and output data registers, the data processing unit (BPS), the unit firmware control (MCS) and clock generator (ICG), which synchronizes the work of the IPA, BAUD, registers, fifth and sixth multiplexers with time division, and the display unit 38. Device firmware control operates in pipeline mode, which improves performance due to parallel the organization of the work buffer registers, digital IIR filters, multiplexers, arithmetic adders-vychitala, arithmetic units multiplication with accumulation and microprocessor kit 37. Input and output the analyzed communication channel 20 are measuring inputs of the device.

Measurement of the transport delay of signals τ_{T}in technology and communications, such as telephony (from 100 Hz to 10 kHz) in normal operation, accompanied by remotely distributed industrial noise n_{i}(t), which are in General limited to the hinnon observation interval are non-stationary in nature.
At the entrance of the investigated object 20 from the first analog output of the generator 18 of the tone signals of frequencies through the third multiplexer 19 coherently with the common synchronization signal is supplied to the test signal X_{1}(nT). At the same time this signal is fed to the input of the first ADC 8. From the second analog output of the generator 18 of the tone signals of frequencies through the third multiplexer 19 to the input of the second ADC 9 is applied coherently copy of the test signal X_{2}(nT), shifted in time by a reference delay τ_{M}that is software controlled microprocessor kit 37. From the output of the research object 20 signal Y*(t)=Y(t)+N(t), where Y(t) is the useful signal, a N(t) is the generalized disturbance, is input to the third ADC 21. The signals from the outputs of the first, second and third ADC 8, 9 and 21 in parallel through the first, second and third buffer registers 10, 11 and 22 are received at the respective inputs of the first, second and third digital IIR filters 14, 15 and 23.

In accordance with the algorithm of approximation of the operator of the transport delay of signals tonal frequencies e^{-τs}next Pade and limited to engineering practice second order on the respective outputs three digital IIR filters 14, 15 and 23 continuously pipelining signals are formed With_{ji}(nT), where T is the quantization step in time, a single for ADC buffer the s registers and digital IIR filter,
working in a pipelined mode, and n=1, 2, 3, 4,...

Signals_{ji}(nT) are removed from the first, second and third outputs of the respective digital IIR filters, and

C_{j3}(nT)=d_{j2}(nT)/dt=d^{2}With_{j1}(nT)/dt

where j=1, 2, 3.

Unlike the prototype is continuously formed in parallel in time two algebraic equation of the form:

When this reference shift copies of the test signal Te for the second analog output of the generator 18 of the tone signals of frequencies is selected as follows:

It is enough to |τ_{e}|>|τ_{t}|.

From equations (1) and (2) you can go to equations of the form:

where DF_{T}- an unknown parameter characterizing the sign and magnitude of the transport delay of the signal tone frequencies in a linear path channels of communication, including ADC and digital IIR filters, DF_{M}the second optional parameter allowing you to set the random measurement error caused in the General case of non-stationary noise in the observation interval. This parameter characterizes the transport delay of the signal on the second output of the generator 18 relative to the signal tone frequency on the yield of the investigated object 20.

Variables Z_{ij}(nT) at discrete points (nT) are formed on the respective outputs of the arithmetic adders-vychitala 16, 17, 25, 26, 27 and 28. The signals from the outputs of the six arithmetic adders-vychitala pairs synchronously arrive at the corresponding inputs of a six arithmetic units multiplication with accumulation 29, 30, 31, 32, 33, 34.

Accuracy assessment of the transport delay of the tone signals of frequencies in the linear channel of communication with different types of modulation increases with the statistical accumulation of information on arithmetic blocks the multiplication with accumulation in the synchronous control analog generator 18 signal tone frequencies. Integration of the signals included in equations (4) and (5), on a specially generated periods of time from the n_{i}T to (n_{i}+k_{i}T replaced by numerical integration method rectangles. The sample size is controlled by firmware running MCU microprocessor kit 37, which then decides BAUD two algebraic quadratic equations, formed in parallel in time:

where

j=1, 2; m=1, 2, 3.

Microprocessor kit 37 unlike the prototype computes two values: DF_{T}* and DF_{M}*. Signs and amount the s DF_{
i}* are displayed on the display unit 38.

Using the identity (3), under steady-state transport delay signal tone frequencies (which is typical for fixed location subscriber - node") can completely eliminate the measurement error of the transportation lag signal tone frequencies, caused by industrial noise. As shown by experimental studies, in the range from 50 Hz to 10 kHz measurement accuracy τ_{T}* approaching the resolution of microprocessor kit. This preserves the possibility of rapid technical diagnostics of communication channels in real time. Prospective application of the digital device in the task of positioning the mobile subscribers in the combined data network, including both wired communications and radio channels. Improved accuracy of measurement of the transport delay of signals in the normal operating mode will increase the speed of diagnosis and commissioning of complex radio systems.

Digital device for measuring the transport delay of the signal in technology and communication technology, comprising a generator of harmonic signals of the reference frequency reference pulse shaper synchronization counter, square wave pulser, digital block is regulirovaniya phase synchronization, the output of which is connected to the reference input of the phase generator of rectangular pulses, the output of which is connected through the key signal to the information input of the quadrature demodulator, the first generator output harmonic signals of the reference frequency is connected with the first common-mode input quadrature demodulator and a pulse shaper connected to the input of the counter, while the second generator output harmonic signals of the reference frequency is connected with the second input of the quadrature demodulator, the information inputs of the first and second buffer registers are measuring inputs for connection respectively to the outputs of the first and second ADCS, the first and second digital IIR filters connected to the outputs of the first and second buffer registers, respectively, the inputs the first and second multiplexers are connected to the first, second and third outputs of the respective digital IIR filters, the first control output of the microprocessor kit is connected to the reset input in the initial state of the digital control unit of the synchronization phase, the second input is connected to the second control output of the microprocessor package, the output of the pulse shaper is connected to the synchronization input of microprocessor kit, the total output synchronization which is connected with the corresponding the inputs synchronization buffer register, IIR filters, multiplexers and arithmetic adders-vychitala, third, fourth and fifth control outputs of the microprocessor sets connected with corrective inputs of the first digital IIR filter, sixth, seventh and eighth control outputs of the microprocessor sets connected with appropriate corrective inputs of the second digital IIR filter, the ninth control output of the microprocessor kit is connected to the control input of the display unit, characterized in that it introduced the analog signal generator tone frequency, the first input connected to the second output key, the second with the first control the output of microprocessor kit, and the third input with the second Manager the output of microprocessor kit, the third multiplexer, two inputs of which are connected to the outputs of the quadrature demodulator, and the other two with analog outputs of the signal generator tone frequency, the first output of the third multiplexer is connected to the input channels of communication and to the input of the first ADC and the second output to the input of the second ADC, the output channels of a connected series circuit of the third ADC, the third buffer register, the third digital IIR filter, correcting the input of which is connected with the tenth, eleventh and don datim control outputs of the microprocessor kit, and the fourth multiplexer, three inputs of which is connected to three respective outputs of the third digital IIR filter, and nine outputs of the first, second and fourth multiplexers are pairwise connected to corresponding inputs of a six arithmetic adders-vychitala, the output of the first arithmetic adder-vicites connected to the first input of the first arithmetic unit multiplication with accumulation, the output of the second arithmetic adder-vicites connected to a second input of the first arithmetic unit multiplication with accumulation, the first and second inputs of the second arithmetic unit multiplication with accumulation and the first input of the third arithmetic unit multiplication with accumulation, the output of the third arithmetic adder-vicites connected with a second input of the third arithmetic unit multiplication with accumulation, the fourth arithmetic adder-vicites connected to the first input of the fourth arithmetic unit multiplication with accumulation, the output of the fifth arithmetic adder-vicites connected to a second input of the fourth arithmetic unit multiplication with accumulation, the first and second inputs of the fifth arithmetic unit multiplication with accumulation and the first input of the sixth arithmetic unit multiplication with accumulation, and the output of the sixth arithmetic summit the RA-vicites connected to a second input of the sixth arithmetic unit multiplication with accumulation, the outputs of the first, second and third arithmetic units multiplication with accumulation connected with the corresponding inputs of the fifth multiplexer, the output of which is connected to the first information input of the microprocessor unit, and the outputs of the fourth, fifth, and sixth arithmetic units multiplication with accumulation connected respectively to the inputs of the sixth multiplexer, the output of which is connected with the second information input of microprocessor kit, and the total output synchronization microprocessor kit is connected to the corresponding inputs synchronization of all multiplexers, digital IIR filters, arithmetic adders-vychitala, arithmetic units multiplication with accumulation.

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5 cl, 5 dwg

FIELD: radio engineering.

SUBSTANCE: device for measuring effective scattering cross-section of radio-location objects has receiving-transmitting unit, registrar, stand mounted for rotation and provided with fixing unit which is used for mounting test object oriented in such a manner that normal to flat front of electromagnet wave radiated by receiving-transmitting unit belongs to preset plane of rotation of object. Precision inspection of measurement of angular diagram of effective scattering cross-section of objects provided due to the fact that radio-transparent envelope is rigidly fixed on the surface of object in parallel with preset plane of rotation of object. Radio-transparent envelope is made in form of thin straight cylinder of preset size. Cavity of envelope is partially filled with e4lectrically conducting liquid. Measured maximal level of effective scattering cross-section of main lobe of radio-transparent cylinder allows to find angle of inclination of plane of rotation of object.

EFFECT: improved precision of inspection.

7 dwg