RU2507589C2 - Method for combined processing of time-division channelling telemetric signals detected at spatially spaced measuring means - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: method involves generating a generalised data array based on combined processing of signals detected at spatially spaced measuring means by measuring instantaneous values of quadrature signal components at intermediate frequency to decision devices, which enables to obtain, as a result of combined processing, an improved signal-to-noise ratio at the input of the decision device.

EFFECT: reducing telemetry losses associated with the threshold effect of receiving equipment, arising in unfavourable receiving conditions at spatially spaced measuring means.

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Description

The invention relates to radio engineering, television measurement technology and can be used in the reception, registration and joint processing of telemetry signals with time division of channels recorded on spatially separated measuring means by fixing the instantaneous values of the quadrature components of the intermediate frequency signal.

A known method of diversity reception, which consists in three times repeating each bit of the message during transmission and registration of the discharge, which was received at least two times out of three [1].

The closest technical solution is the method of diversity reception, which consists in receiving repeatedly repeated messages telemetry and recording messages received more times than all others [2].

A disadvantage of the known methods for joint processing of telemetric signals with time division of channels is that the joint processing of the registered signals is carried out after the detection, synchronization and demodulation procedures, which, in the case of low signal-to-noise ratios at the inputs of the receiving devices, result in a large number of anomalous errors as a result poor-quality work of decisive devices (uncertain work) on all measuring instruments. Such sites are characterized by a large number of rejected samples (areas of partial loss of telemetric information).

To eliminate this drawback, it is necessary to implement the technology of forming a generalized data array, based on joint processing of signals received on spatially separated measuring means, to decision devices, which will result in joint processing to improve the signal-to-noise ratio at the input of the decision device and, as a result, reduce telemetry data loss.

The required technical result is to reduce the loss of television measurements associated with the threshold effect of the receiving equipment that occurs under adverse reception conditions on spatially separated measuring means.

и квадратурной $$z_s^q$$

, амплитуд принимаемого телеметрического сигнала при достаточно медленных его замираниях, осуществляется путем реализации принципов когерентного сложения, который предполагает выполнение операции компенсации разности фаз Δφ^q между сигналами, зарегистрированными в разных каналах разнесения, и умножение на весовые коэффициенты µ^q, которые характеризуют зависимость изменения амплитуды сигнала от изменения коэффициента передачи в каждом q-ом канале. Оценка параметров Δφ^q и µ^q, при реализации алгоритма совместной обработки данных, зарегистрированных на различных измерительных средствах, осуществляется на основе обработки совокупности служебных сигналов, используемых при формировании группового телеметрического радиосигнала с временным разделением каналов. Приведение в соответствие данных, зарегистрированных на различных измерительных пунктах и относящихся к одному и тому же сообщению, необходимо осуществлять по правилу максимума функции взаимной корреляции, которая вычисляется на основе совместной обработки данных, полученных в различных каналах разнесения. Максимум полученной функции будет характеризовать момент, соответствующий совпадению данных, зарегистрированных в различных каналах разнесения.The specified technical result is achieved in that the joint processing of data recorded by the method of recording and processing a telemetry signal with time division of channels on various measuring instruments and representing discrete common-mode readings $$z_c^q$$

and quadrature $$z_s^q$$

, the amplitudes of the received telemetric signal with sufficiently slow fading, is carried out by implementing the principles of coherent addition, which involves the operation of compensating for the phase difference Δφ ^q between signals recorded in different diversity channels, and multiplying by weight coefficients μ ^q , which characterize the dependence of the change in signal amplitude from a change in the transmission coefficient in each qth channel. The estimation of the parameters Δφ ^q and μ ^q , when implementing the algorithm for joint processing of data recorded on various measuring tools, is based on processing a set of service signals used in the formation of a group telemetric radio signal with time division of channels. Alignment of the data recorded at different measuring points and related to the same message must be carried out according to the maximum rule of the cross-correlation function, which is calculated on the basis of joint processing of data received in different diversity channels. The maximum of the obtained function will characterize the moment corresponding to the coincidence of the data recorded in the various diversity channels.

The implementation of joint data processing can be represented by the expression

$$R_x=\sqrt{{\left[{\displaystyle \sum _{q=\mathrm{one}}^Q{\mu }^q{\rho }_{c\text{x}}^q}\right]}^2+{\left[{\displaystyle \sum _{q=\mathrm{one}}^Q{\mu }^q{\rho }_{s\text{x}}^q}\right]}^2,}(\mathrm{one})$$

- квадратурные составляющие огибающей корреляционной функции, полученные с учетом компенсации разности фаз Δφ^q.Where $${\rho }_{c,s_x}^q$$

- quadrature components of the envelope of the correlation function, obtained taking into account the compensation of the phase difference Δφ ^q .

To obtain quadrature components, you must run the following algorithm

и $${\rho }_{s\text{ x}}^q={\displaystyle \sum _{n=1}^{N_{кан}}{s}_n^x\left(z_{s\text{ n}}^q\cos \Delta {\varphi }_0^q-z_{c\text{ n}}^q\sin \Delta {\varphi }_0^q\right)},(2)$$

$${\rho }_{c\text{x}}^q={\displaystyle \sum _{\text{n}=\text{one}}^{N_{\mathrm{to}\mathrm{but}n}}{s}_n^x\left(z_{c\text{n}}^q\cos \Delta {\varphi }_0^q+z_{s\text{n}}^q\sin \Delta {\varphi }_0^q\right)}$$

and $${\rho }_{s\text{x}}^q={\displaystyle \sum _{n=\mathrm{one}}^{N_{\mathrm{to}\mathrm{but}n}}{s}_n^x\left(z_{s\text{n}}^q\cos \Delta {\varphi }_0^q-z_{c\text{n}}^q\sin \Delta {\varphi }_0^q\right)},(2)$$

- выборка сигнала, соответствующего значению х параметра u;Where $$s_n^x$$

- sample signal corresponding to the value x of the parameter u;

- данные в q-ом канале разнесения, соответствующие дискретным значениям квадратурных составляющих принимаемого сигнала, относящихся к одному и тому же интервалу времени, где n=1,…,N_кан, $$z_{c,s_n}^q$$

- data in the q-th diversity channel corresponding to discrete values of the quadrature components of the received signal related to the same time interval, where n = 1, ..., N _channel ,

- фазовый сдвиг между 1-ым и q-ым каналом разнесения. $$\Delta {\varphi }_0^q$$

- phase shift between the 1st and qth diversity channels.

, полученную на основании реализации способа регистрации и обработки телеметрического сигнала с временным разделением каналов при восстановлении временной структуры зарегистрированных данных, отражающих дискретные значения огибающей взаимной корреляционной функции принимаемого сигнала и эталонного синхросигнала. Данная зависимость выражает только энергетические характеристики случайных процессов и не зависит от неопределенности начальных фаз регистрируемых сигналов в каждом канале разнесения.To determine the data corresponding to the same time interval Δt _jr (where j is the frame number and r is the channel number), it is advisable to use a data sequence as the object of analysis $$\left\{R_k^2\right\}$$

obtained based on the implementation of the method of recording and processing a telemetric signal with time division of channels when restoring the temporal structure of the recorded data, reflecting discrete values of the envelope of the mutual correlation function of the received signal and the reference clock signal. This dependence expresses only the energy characteristics of random processes and does not depend on the uncertainty of the initial phases of the recorded signals in each diversity channel.

To select data arrays corresponding to the same intervals, it is necessary to find the maximum of the cross-correlation function (CVF), which is determined according to the expression

$$K_d^q=\frac{\mathrm{one}}{K-D}{\displaystyle \sum _{k=\mathrm{one}}^{K-D}\left\{{\left(R_k^{\mathrm{one}}\right)}^2-M\left[{\left(R_k^{\mathrm{one}}\right)}^2\right]\right\}\left\{{\left(R_{k+d}^q\right)}^2-M\left[{\left(R_{k+d}^q\right)}^2\right]\right\}},(3)$$

- дискретное представление ФВК между первым и q-ым каналом разнесения;Where $$K_d^q$$

- discrete representation of the FVC between the first and qth diversity channels;

d = 0,1,2, ..., D is the number of ordinates of the FVC.

будет характеризовать сдвиг, при котором данные, зарегистрированные в первом канале, соответствуют данным в q-ом канале разнесения. Это позволит сформировать множества $$\left\{z_n^q\right\}$$

, соответствующие одному и тому же временному интервалу Δt_jr (канальному интервалу).Maximum correlation function $$K_d^q$$

will characterize the shift at which the data recorded in the first channel correspond to the data in the qth diversity channel. This will allow the formation of sets $$\left\{z_n^q\right\}$$

corresponding to the same time interval Δt _jr (channel interval).

When implementing the proposed method for the joint processing of telemetry signals with time division of channels recorded on spatially separated measuring means, the following operations are performed.

при реализации способа регистрации и обработки телеметрического сигнала с временным разделением каналов при восстановлении временной структуры зарегистрированных данных в каждом канале разнесения q (фиг.1)1. Calculation of FVK, based on the obtained dependencies $${\left(R_k^q\right)}^2$$

when implementing the method of recording and processing a telemetric signal with time division of channels when restoring the temporal structure of the recorded data in each diversity channel q (Fig. 1)

$$K_d^q=\frac{\mathrm{one}}{K-D}{\displaystyle \sum _{k=\mathrm{one}}^{K-D}\left\{{\left(R_k^{\mathrm{one}}\right)}^2-M\left[{\left(R_k^{\mathrm{one}}\right)}^2\right]\right\}\left\{{\left(R_{k+d}^q\right)}^2-M\left[{\left(R_{k+d}^q\right)}^2\right]\right\}}$$

- дискретное представление ФВК между первым и q каналом разнесения;Where $$K_d^q$$

- discrete representation of FVK between the first and q diversity channel;

d = 0,1,2, ..., D is the number of ordinates of the FVC.

, имеет максимум, характеризующий соответствие данных зарегистрированных в первом канале разнесения, данным, зарегистрированным в q-ом канале (нулевой сдвиг между сигналами, зарегистрированными в разных каналах) (фиг.2).2. Determination of the shift d at which FVK $$K_d^q$$

has a maximum characterizing the correspondence of the data recorded in the first diversity channel to the data registered in the q-th channel (zero shift between signals registered in different channels) (Fig. 2).

с учетом реализации оператора восстановления временной структуры зарегистрированных данных и определения фазовых соотношений между данными, зарегистрированными в различных каналах разнесения q, множеств $$Z_{\Delta t_{jr}}^q=\left\{z_n^q\right\}$$

, где n=1,2,…N_кан - данные, принадлежащие одному и тому же элементу сообщения в ^q-ом канале разнесения, т.е. соответствующие временному интервалу Δt_jr.3. Formation from recorded data $$\left\{z_k^q\right\}$$

taking into account the implementation of the operator of reconstructing the temporal structure of the recorded data and determining the phase relations between the data recorded in various diversity channels q, sets $$Z_{\Delta t_{jr}}^q=\left\{z_n^q\right\}$$

Where n = 1,2, ... N _kan - the data belonging to one and the same element in the ^q th communication channel spacing, i.e. corresponding to the time interval Δt _jr .

4. Calculation, on the basis of a priori information about the structure of the telemetric signal, of estimates of phase shifts Δφ ^q in various diversity channels and weight coefficients µ ^q , characterizing the change in the amplitude of the received signal depending on the change in the transmission coefficient.

5. The calculation of functional dependencies (figure 3), reflecting the quadrature components of the correlation integral with compensation for phase shifts, in accordance with the expression

и $${\rho }_{c\text{x}}^q={\displaystyle \sum _{n=\mathrm{one}}^{N_{\mathrm{to}\mathrm{but}n}}{s}_n^x}\left(z_{c\text{n}}^q\cos \Delta {\varphi }_0^q+z_{s\text{k}}^q\sin \Delta {\varphi }_0^q\right)$$

and

, $${\rho }_{s\text{x}}^q={\displaystyle \sum _{n=\mathrm{one}}^{N_{\mathrm{to}\mathrm{but}n}}{s}_n^x}\left(z_{s\text{n}}^q\cos \Delta {\varphi }_0^q+z_{c\text{k}}^q\sin \Delta {\varphi }_0^q\right)$$

,

- выборка сигнала, соответствующая значению X параметра u_jr;Where $$s_n^x$$

- a signal sample corresponding to the value X of the parameter u _jr ;

- фазовый сдвиг между 1-ым и q-ым каналом разнесения. $$\Delta {\varphi }_0^q$$

- phase shift between the 1st and qth diversity channels.

6. The calculation of the dependence corresponding to discrete values of the envelope of the function of the mutual correlation integral between the registered signal and the reference signal,

$$R_x=\sqrt{{\left[{\displaystyle \sum _{q=\mathrm{one}}^Q{\mu }^q{\rho }_{c\text{x}}^q}\right]}^2+{\left[{\displaystyle \sum _{q=\mathrm{one}}^Q{\mu }^q{\rho }_{s\text{x}}^q}\right]}^2}$$

over all possible values of x.

7. Determining the value of the parameter u _jr corresponding to the maximum value of the function R _x .

The proposed method of recording and processing a telemetric signal with a time division of channels provides the specified technical result - reducing the loss of television measurements associated with the threshold effect of the receiving equipment that occurs under adverse reception conditions on spatially separated measuring means.

The above information indicates the fulfillment of the following set of conditions when using the claimed technical solution:

- the proposed method is intended for use in industry, namely in radio engineering, in particular, in stations of reception, registration and processing of telemetric information;

- for the claimed method in the form as described in the independent claims of the claims, the possibility of its implementation using known means and methods prior to the priority date is confirmed.

Therefore, the claimed technical solution meets the criterion of "industrial applicability".

LITERATURE

1. Fink L.M. Theory of discrete message transmission. - M .: Owls. Radio, 1963, p. 340.

2. Manovtsev L.A. Introduction to digital radio telemetry. - M .: Energy, 1967, p. 295.

Claims (1)

A method of joint processing of telemetric signals with time division of channels recorded on spatially separated measuring means, which consists in the fact that the joint processing of data recorded by the method of recording and processing telemetry signal with time division of channels on various measuring means and representing discrete readings of in-phase and quadrature components of the received telemetry signal with rather slow fading, carry out pu we implement the principles of coherent addition, which involves performing the operation of compensating for the phase difference between the signals recorded in different diversity channels, and multiplying by weighting coefficients, which characterize the dependence of the change in signal amplitude on the change in transmission coefficient in each diversity channel, characterized in that the formation of a generalized array data based on joint processing of signals recorded on spatially separated measuring means by the fixed method The instantaneous values of the quadrature components of the intermediate frequency signal are carried out to the decisive devices.

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