RU2199816C2 - Method for setting and automatic regulation of channel output signal level - Google Patents

Abstract

FIELD: radio engineering; automatic-control and communication systems including amplifier channels of transmitters and receivers. SUBSTANCE: method designed for automatic setting and regulation of output signal level in complex variable-parameter broadband channels such as those of radio transmitter exciters depends on presetting output signal level of channel using for the purpose coarse and fine regulation in which case output signal of channel does not exceed maximum permissible level throughout entire range of channel output signal variations, as well as measuring output signal level with coarse and fine regulation of output signal level. In the process a number of interrelated operations are made, as follows: delayed measurement of channel output signal level; evaluation of regulation signals by functional transforms of measurement results of output signal level that has become steady state upon first regulation stage including rated level; repeated coarse and fine regulation of signal level. EFFECT: enhanced speed and precision of setting output signal level. 1 dwg

Description

 The invention relates to radio engineering and can be used in automation systems, communications, including in the paths of amplifiers of transmitters and radios.

 Known methods for automatic, including discrete, gain control, providing multiple sequential execution of actions on signals: measuring the level of the output signal, comparing the result of measuring the output signal with a given value, calculating control signals from the results of comparing the measured and given signal levels, including coarse and precise, regulation of the output signal level [1-3].

 In addition, there is a method based on sequential periodic using control signals performing the following actions on signals: measuring the level of the output signal, comparing the levels of the output and reference signals, in case of exceeding the level of the output signal over the reference signal, the adjustment coefficient adjustment signal is determined as a function of the ratio of the measured and reference signal levels, the delay in calculating the control signal for the time of choosing the maximum signal amplitude, subtracting dividing the regulation signal as the sum of the adjustment coefficient adjustment signal and the previous regulation signal, adjusting the output signal level [4].

 These methods do not allow quick and accurate installation and automatic maintenance of the output signal level in complex amplification, selection and signal conversion paths.

 The closest technical solution to the proposed invention is the method described in [5]. This method of signal normalization, based on the preliminary establishment of the output signal level using the minimum values of the coarse and fine control signals, measuring and storing the output signal level, the delay of the input adjustable signal for the time of calculating the coarse control signal, calculating the coarse control signal by increasing it sequentially to the value when the level of the output signal is not equal to the specified accuracy provided by the coarse control signal roughly adjusting the level of the output signal, measuring and storing the level of the output roughly adjusted signal, its delay by the time of calculating the fine control signal, calculating the fine control signal by incrementally increasing it to a value when the level of the output signal is not equal to the specified accuracy provided by the fine signal regulation.

 However, this method has a low speed and does not allow with the necessary accuracy the installation and automatic maintenance of the output signal level in complex broadband RF paths with frequency conversion, since it involves repeated switching of the adjustable signal, as well as high accuracy of the attenuator control steps. In addition, the known method when leaving the output signal level beyond the specified limits does not adjust the output level, and periodically, regardless of the state, performs the same regulation procedure, starting with a preset, which creates significant noise in the output signal, which is practically unacceptable in amplifiers both radio transmitters and radio receivers.

 The problem to which the invention is directed, is to increase the speed and accuracy of installation and automatic adjustment of the output signal level in complex broadband paths with variable parameters, for example exciters of radio transmitters.

 The solution to the problem is achieved by the fact that in the known method of setting and automatically adjusting the level of the output signal of the path, based on the preliminary determination of the level of the output signal of the path using coarse and precise control, in which the output signal of the path in the entire range of input signal parameters does not exceed the maximum permissible level , measuring the level of the output signal and rough and fine-tuning the level of the output signal, additionally performs the following interconnected steps Twiya: after the above-mentioned preliminary determination of the level of the output signal of the channel, the measurement of the level of the output signal of the channel is delayed, after the measurement of the level of the output signal of the channel, the signals of coarse and fine regulation are determined by functional transformation of the result of measuring the level of the output signal of the channel, taking into account the signals of preliminary rough and fine regulation and path output signal level, coarse and precise control of the path output signal level, delay rhenium level of the output signal of the path, measuring the level of the output signal of the path, determining the fine control signal by comparing the levels of the nominal and output signals and then calculating the fine control signal, adjusting the level of the output signal of the path, delay measuring the level of the output signal of the path, measuring the level of the output signal of the path, comparison the path output signal level with upper and lower permissible limits, in case the path output signal level goes beyond the set lower If the upper or lower limits are performed, the sequence of actions on the signals is repeated one to three times, starting from the moment the exact control signal is determined, if after the last steps it is not possible to set the output signal level of the path within the specified limits, the sequence of actions on the signals is repeated, starting with the preset level path output using coarse and fine control signals.

 Comparative analysis with the prototype shows that the introduction of significant distinguishing features is new and allows you to solve the problem.

 The drawing shows the algorithm of the proposed method of installation and automatic adjustment of the level of the output signal of the tract, explaining its operation.

 We make some clarifications and clarifications.

где К_ГП и К_ТП - значения грубого и точного сигналов регулирования при предварительной установке;
К_Тmax - максимальное значение сигнала точного регулирования;
ε_г - абсолютная погрешность сигнала грубого регулирования с учетом всех дестабилизирующих факторов;
U_НОМ - значение регулируемого сигнала номинального уровня (опорный сигнал);
U_ВЫХ - значение результата измерения уровня выходного сигнала;
К_ГФ и К_ТФ - значения сигнала грубого и точного регулирования, получаемых в результате функционального преобразования, причем за K_ГФ принимается ближайшее в сторону больше разрешенное значение сигнала грубого регулирования, а за К_ТФ принимается ближайшее в сторону больше-меньше разрешенное значение сигнала точного регулирования.For the effective operation of the proposed method using the principles of digital signal processing, it is proposed to perform functional conversion of the result of measuring the level of the output signal of the path in accordance with the expressions

where K _GP and K _TP - the values of coarse and accurate control signals during pre-installation;
To _Tmax is the maximum value of the fine control signal;
ε _g - the absolute error of the signal of coarse regulation, taking into account all destabilizing factors;
U _NOM - value of the adjustable signal of the nominal level (reference signal);
U _OUT - the value of the result of measuring the level of the output signal;
K _GF and K _TF are the values of the coarse and fine control signal obtained as a result of the functional transformation, and for K _{GF the} nearest allowed value of the coarse control signal is taken higher to the side, and K _TF is the closest to the more or less allowed value of the fine control signal .

при этом за К_Т принимается ближайшее в сторону больше-меньше разрешенное значение сигнала точного регулирования.The determination of the fine control signal in a repeated refinement cycle is proposed to be carried out according to the formula

at the same time, K _{T is} taken as the closest to the side more or less the allowed value of the fine control signal.

 The magnitude of the delay in measuring the level of the output signal of the path should be sufficient for the attenuation of transients after adjusting the level of the output signal of the path.

 Thus, the proposed method for installing and automatically adjusting the level of the output signal of the channel, using parallel calculation procedures, allows you to set the output level of the channel with high accuracy, and when the output signal level of the tract goes beyond the specified limits, an accurate adjustment of the output level using only fine control is provided, which to a much lesser extent causes interfering actions in the regulation path. In general, the proposed method allows us to solve the problem of improving the speed and accuracy of installation and regulation of the output level in complex paths with variable parameters.

Sources of information
1. A.S. 489200, H 03 G, 3/20, 1972

 2. A.S. 843165, H 03 G, 3/20, 1979

 3. A.S. 1228219A2, H 03 G, 3/20, 1986

 4. A.S. 1107286, A H 03 G, 3/20, 1982

 5. A.S. 618834, H 03 G, 3/20, 1980

Claims (1)

 The method of installation and automatic adjustment of the path output signal level, based on the preliminary determination of the path output signal level using coarse and fine control, in which the path output signal in the entire range of input signal parameters does not exceed the maximum permissible level, measuring the output signal level and coarse and precise control of the output signal level, characterized in that they additionally perform the following interrelated actions: after the above To set the output signal level of the channel, the measurement of the output signal level of the channel is delayed, after measuring the output signal level of the channel, the signals of coarse and fine regulation are determined by functional transformation of the result of measuring the level of the output signal of the channel, taking into account preliminary rough and precise regulation signals and the nominal level of the channel output signal , coarse and precise control of the level of the output signal of the path, the delay in measuring the level of the output signal path, measuring the level of the output signal of the path, determining the signal of precise regulation by comparing the levels of the nominal and output signals and then calculating the signal of the precise regulation, adjusting the level of the output signal of the path, the delay in measuring the level of the output signal of the path, measuring the level of the output signal of the path, comparing the level of the output signal the path with the upper and lower permissible limits set, in case the output signal level of the path goes beyond the set lower or upper permissible limits, one-three-fold repetition of the sequence of actions on the signals is performed, starting from the moment the exact control signal is determined, if after the last steps it is not possible to set the output signal level of the path within the established between the lower and upper permissible limits, the sequence of actions on the signals is repeated, starting with presetting the path output signal level using coarse and fine control signals.

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