SU1129544A1 - Signal spectral analysis device - Google Patents

Abstract

1. DEVICE FOR SPECTRAL ANALYSIS OF SIGNALS containing an analog-to-digital converter whose input is a device input, N digital shift registers whose information inputs are connected to the corresponding outputs of an analog-digital converter, a synchronizer whose first output is connected to a control input of the analog-digital converter digital converter, and the second output - with clocking inputs of digital shift registers, N into a running digital-to-analog converter, dispersion analyzer of the spectrum, the input of which It is connected to the output of a digital-to-analog converter, and the indicator, whose sync input is connected to the synchronization input of the dispersion spectrum analyzer and the third output of the synchronizer, is different in that, in order to increase the accuracy of the analysis during the cyclic measurement of spectra, the K digital shift registers are introduced into it , N switches, the number of inputs of each of which is equal to K + l, the scaling unit and the soldering unit, the information inputs of the i-ro switch (where i-number of the switch and c shift register) are connected to the i-ro outputs, (i + 1) -th, ..., (i + 10 th) digital shift registers, and the outputs with the corresponding inputs of the digital-analog converter, the input of the scaling unit is connected to the output of the dispersion spectrum analyzer, and the output - to the indicator input; the corresponding information inputs of the decision unit are connected to. information inputs of additional digital registers, a setup input with the fourth synchronizer output, a setup input, switches and a scaling unit, and an output with control inputs of the switches and a control input of the scaling unit. 2. The device according to claim 1 is different in that the solids of the CD SP unit are designed as K triggers: K sharpeners, K -1 elements of W, K-input element IL and K-1 of delay elements, and the single inputs of the triggers are combined and are the installation input of the solver, the inputs of the peaking units are connected to the zero outputs of the corresponding triggers, the first input of the Kth OR element (where K is the number of the trigger, the peaking agent, the delay element and the OR element) is the Kth information input of the decision unit, the input K-th delay element connected to the output Om (K + 1) th spikelet output - with the second input of the K-th element

Description

that OR, the output of which is connected to the zero input of the K-th trigger, the output of the K-input element OR is the output of the decision block, and its inputs are connected to the corresponding outputs of the peaking units.

The invention relates to radio measurements, is intended for spectral analysis of signals and can be used to measure the spectra of radio signals while ensuring the resolution of its resolution.

The closest in technical essence to the expected one is a device for spectral analysis of signals, which is a combination of a digital compressor and a dispersive spectrum analyzer. The device contains an analog-to-digital converter, the signal input of which is the input of the device, N digital shift registers, a synchronizer, the first output of which is connected to the control input of the analog-digital converter, and the second output - to the clock inputs of the digital shift registers, N-input digital-analogue Converter (DAC) 5 dispersive spectrum analyzer, the input of which is connected to the output of the DAC, the corresponding inputs of which are connected to the outputs of the digital shift registers, and the indicator, the input to orogo connected to the output of the dispersion of the spectrum analyzer, and sinhronizirzposchy input; . connected to the synchronization input of the dispersive spectrum analyzer and the third output of the synchronizer

To match the characteristics of the input signals with the parameters of the dispersive spectrum analyzer, information from the registers must be extracted at high speed. In this case, the DAC is required to be fast. However, the higher the speed of the DAC, the smaller the possible number of their control inputs. In this connection, the dynamic range of signals that can be converted into a DAC is limited. If the dynamic range of the input signal is greater than the dynamic range of the device, then the accuracy of the analysis significantly depends on the degree of matching the top level of the input signal with the used DAC.

The aim of the invention is to improve the analysis accuracy during cyclic measurement of spectra by matching the information about the input signal level with the dynamic range of the DAC and restoring the true signal level at the output of the dispersive spectrum analyzer.

The goal is achieved by the fact that the device containing an analog digital converter, whose input is the device input, N digital shift registers, information inputs — which are connected to the corresponding outputs of the digital converter, the synchronizer, the first output of which is connected to the control input of the analog digital converter, and the second output is with clock inputs of digital shift registers, N input DAC, dispersive spectrum analyzer, the input of which is connected to the DAC output, and and An indicator, the synchronization input of which is connected to the synchronization input of the dispersion analyzer of the spectrum and the third synchronizer code, is additionally introduced to digital shift registers, N com-switches, the number of inputs of each of which is K + 1, the scaling unit and the decisive block, and the information inputs i- The switch ro ro (where i is the number of the commentator and the digital shift register) is connected to the i-ro, (i + 1) -ro, ..., (i + K) -ro outputs of the digital shift registers, and the inputs to the corresponding inputs digital to analog conversion The gate, the input of the scaling unit is connected to the output of the dispersive spectrum analyzer, and the output is connected to the indicator input, the corresponding information inputs of the decision block are connected to the information inputs of the additionally entered digital registers, the setup input with the fourth synchronizer output, the setup inputs of the switches and the scaling unit, and the output with the control inputs of the switches and the control input of the scaling unit. The decision block is designed as K flip-flops, K sharpeners, K-1 elements ILI, K-input element OR and K-1 delay elements, the single inputs of the triggers are combined and are the installation input of the decision block, the inputs of sharpeners are connected to zero inputs of the corresponding flip-flops, the first input of the K-th element OR (where K is the number of the trigger, sharpen l, the delay element and the OR element) is the K-th information input of the decision block, the input of the K-th delay element is connected to the output (K + 1) sharpener, exit - with the second entrance of the K-th the OR element, the output of which is connected to the zero input of the K-th trigger, the output of the K-input element OR is the output of the decision block, and its inputs are connected to the corresponding outputs of the peaking agents. In the proposed device, the number of digital shift registers is increased compared to the prototype, depending on the amplitude of the input signal, information about which is written to these registers, using the input switches to the DAC (the number of inputs N of which is the same as that of the prototype), only N corresponding registrar In this case, the input signal is not limited, but its scale changes and the dynamic range of the signal change at the output of the DAC remains the same as in the prototype. The information about the zooming of the amplitude of the signal is recorded in the decision block, which at its output outputs a command to appropriately restore the true amplitude of the signal, which is produced using the scaling block. FIG. 1 and 2 shows the block schemes of the proposed device. The device contains an analog-to-digital converter 1, the outputs of which are connected to the inputs of digital 1 4 shift registers 2-1, 2-2, ..., 2-N, ..., 2- (K-1), 2-K , synchronizer 3, D / A converter 4, connected to the input of the dispersive spectrum analyzer 5, indicator 6, switches 7-1-7-N, scaling unit 8, the input of which is connected to the output of the decision block 9, triggers 10-1-10-K are connected to 11-1-11 K sharpener inputs, OR elements 12-1-12- (К-1), one inputs of which are connected to the outputs of delay elements 13-1-13- (К-1), whose inputs are connected to К- the inputs of the element OR 14. Device p Botan follows. The input signal is fed to analog-to-digital converter 1. At the inputs of which appears digital information corresponding to the amplitude of samples from this signal. FIG. 1 the number of registers corresponding to the number of binary digits of the number characterizing the amplitude of the sample, for definiteness, is set equal to six (). The sampling information is recorded in digital shift registers 2-1,.,., 2-K with a small frequency F- determined from the Kotelnikov theorem:, where uf is the width of the signal spectrum. After all the register memory cells have been filled, the read inputs of the registers are sent to the clock inputs of the registers with a high frequency corresponding to the viewing band of the dispersive spectrum analyzer 5, the digital information being converted to analog form using a DAC 4. On FIG. Figure 1 shows a 4-input D / A converter (), while for definiteness it is assumed that this is the maximum possible number of control inputs for a D / A converter of such speed. A similar device can be built for other values of N and K. Before the device starts operation, the signal from the 4th synchronizer output goes to the installation inputs of the rotating unit 9, the switches 7-1, ..., 7-N and the scale- 8, as a result of which the initial state of these blocks is provided. If the amplitude of the signal at the input of the device is not too large and therefore information about it is recorded only in the first four shift registers 2-1, ..., 2-N, the inputs S1 of the additionally entered registers 2- (K-1), 2-K during the entire write cycle, the gogic zeros of tt are received as a result of the initial state of the decision block 9 does not change, there is no command and switches 7-1, ..., 7-N at its output, and also the scale unit 8 remains in the initial state . In this case, the first inputs of all the switches are connected to the DAC inputs, and the scaling unit provides the minimum transmission coefficient, for example. In the mode of reading information from digital registers, the analog signal from the output of the DAC is fed to the input of the dispersive analyzer of the spectrum 5, and the signal characterizing the spectrum through the scaler 8 is fed to the indicator 6. If the input signal amplitude is large enough and information is not recorded in five registers 2-1, .. ,, 2- (K-1), not only zeros but also ones are received at the input of the register 2- (k-1) during the recording cycle. The first impulse, corresponding to a logical unit, goes through the OR element 12-1 to the zero input of the trigger 10-1 and changes its initial state (Fig. 2). As a result, the sharpener 11-1 generates a short pulse, which, through the OR 14 element, arrives at the output of the decision block 9i. This pulse is the command to switch the switches 7-1, ..., 7-N and the scaler 8 so that The second inputs of all switches are connected to the DAC inputs, and the scaling unit provides a transmission factor twice as large as the original one, i.e. Thus, the information of the first register 2 in which the low-order digit of the digital code is recorded is not used, and the code at the output of the switches corresponds to a number two times less than the instinctive one. The real level of the signal is restored using the scaler 8. Restoring the scale of the signal amplitude after 4 6 6 of the lysator 5 reduces the dynamic range requirements of the dispersive spectrum analyzer 5, since its dynamic range may not exceed the dynamic range of the DAC 4. In the case of the greater amplitude of the input signal, information about it is recorded in all registers 2-1 ,, .., 2-K, i.e., logical units are received in additional registers 2- (K-1) and 2-K. Therefore, the state of both triggers 10-1 and 10-f2 included in decision block 9 is changed (Fig. 2). At its output, two short pulses appear, which are the command to switch the switches 7-1, ..., 7-N and the scaling unit 8 in such a way that the third inputs of all the switches are connected to the inputs of the DAC 4 and the scaling unit provides a transfer rate of four times the original, i.e. (delay elements (K-1) and OR elements 12-1-12 (K-1) are inserted into decision block 9 so that it generates two output pulses, even if there are no logics on its first input 1. In this case, the trigger 10-1 also triggers with some delay after the trigger 10-2. For the operation of the DAC 4, the last four registers 2-3, ..., 2-K are used, and the code at the output of the switches corresponds to the number four times less than true. The actual signal level is restored with the help of a scaling block 8, and on the display is The true level of the signal spectrum is observed in Figure 6. The proposed device for spectral analysis favorably differs from the prototype by a large dynamic range of the processed signals, which is determined by a large number of digital shift registers that exceed the limit number of control inputs of the DAC speed.

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Claims (2)

- 1. DEVICE FOR SPECTRAL SIGNAL ANALYSIS, containing an analog-to-digital converter, the input of which is the input of the device, N digital shift registers, information inputs of which are connected to the corresponding outputs of the analog-to-digital converter, a synchronizer, the first output of which is connected to the control input of the analog-to-digital the converter _u and the second output - with clock inputs of digital shift registers, N input digital-to-analog converter, dispersive spectrum analyzer, the input of which It is connected to the output of the digital-to-analog converter, and the sync input indicator of which is connected to the sync input of the dispersion spectrum analyzer and the third ^ output of the synchronizer, characterized in that, in order to increase the accuracy of the analysis during cyclic measurement of the spectra, K digital shift registers, N switches, are added to it the number of inputs of each of which is K + 1I, a scaling unit and a decision block, and the information inputs of the i-ro switch (where ί is the number of the switch and the digital shift register) are connected to the outputs of the i-ro, (ί + 1) -th, ..., (i + К) -th digital shift registers, and the outputs are connected to the corresponding inputs of the digital-to-analog converter, the input of the scaling unit is connected to the output of the dispersion analyzer spectrum, and the output is to the indicator input, the corresponding information inputs of the decisive block are connected to the information inputs of the additionally entered digital registers, the installation input is connected to the fourth output of the synchronizer, the installation inputs of the switches' and the scaling unit, and the output to the control Input switch-governing · g and the control input of scaling unit. 2. The device according to π. 1, resulting in the fact that the decisive unit is made in the form of K triggers: K sharpeners, K-1 OR elements, K-input OR element and K-1 delay elements, and the single inputs of the triggers are combined and are the installation input of the decisive ka, the sharpener inputs are connected to the zero outputs of the corresponding triggers, the first input of the Kth OR element (where K is the number of the trigger, sharpener, delay element, and OR element) is the Kth information input of the deciding unit, the input of the Kth delay element connected to the output of the (K + 1) -th sharpener, the output d - with the second input of the K-th element 1129544 that OR, the output of which is connected by the output of the decisive unit, and its output to the zero input of the K-th trigger, the outputs are connected to the corresponding path of the K-input element OR are the outputs of sharpeners.