SU1203452A2 - Apparatus for preliminary processing of electric survey - Google Patents

Description

one

The invention relates to electrical exploration technology, is intended to pretreat a component of an electromagnetic field, and can be applied in information: measuring systems.

The purpose of the invention is to extend the operating frequency range to a higher frequency region by changing the sampling procedure of the measured signal.

Fig, 1 shows a block diagram of the device; 2 shows a variant of the signal recovery unit.

The device for preliminary processing of electrical prospecting signals contains an input unit 1, the input of which is connected to the first input of the device, and the output - to the input of analog-digital converter 2, a control circuit 3, the outputs of which are connected to the inputs of the first 4 and second 5 frequency dividers. The output of the analog-digital converter 2 is connected to the first input of the unit 6 for generating and analyzing the estimates, the second and third inputs of which are connected respectively to the outputs of the first 4 and second 5 frequency dividers. The output of the first frequency divider 4 is connected to the control input of the input unit 1. The information outputs of the evaluation generation and analysis unit 6 are connected to the information 4 and inputs of the signal recovery unit 7. The control inputs of the frequency divider 4 and 5 and the signal recovery unit 7 are connected to the second input of the device, the outputs of the signal recovery unit 7 are connected to the information inputs of the recorder 8, the control output of the estimating and evaluation analysis unit 6 is connected to the control input of the recorder 8

The signal recovery unit 7: 1a contains N switch groups 9 by N switches in each group and N decoders 10. The switch array thus consists of N rows and N columns. All information inputs of switches 9 from the t-th column are connected to I - input signal of the signal recovery unit 7, and all the outputs of the switches 9 from the J, and the lines are connected to the J m of the signal recovery unit 7, the control inputs of the switches 9 of

034522

The p-th column is connected to the corresponding outputs of the ith desh1-1d.;, Pa 10, all the inputs of the decoder: -. connected to the second input of the device; In a „

The device works as follows.

The input periodic signal is scaled in the input block 1

I) The signal is sampled here. The sampling rate is determined by the frequency of the pulses coming from the output of the 4 frequency divider. Discrete Signal Values

K) are converted into code by analog-digital converter 2. Clock pulses from the outputs of the control circuit 3 are fed to the inputs of the dividers

4 and 5 frequencies with frequency

 t t

where N is the number of discrete samples of the signal for the period; T - the period of the processed input signal.

After the frequency dividers, the clock pulses arrive at the control input of the input unit 1 and the second and third inputs of the unit 6 for the formation and analysis of estimates with frequency

1 h TM (coefficient

dividers dividers 4 and 3 frequencies. If the division factor K 1, then the first discrete count of the input signal will go to the first channel of the block 6 for the formation and analysis of the honeydew.

for the second channel — the second discrete sample of the X signal in the Nth channel — N is the discrete sample of the Xf signal. During one period of the input signal in block 6,

all N are evaluated

discrete samples of the signal. On the next cycle, corresponding to one period of the input signal, the device receives the following N discrete samples of the signal and t, d.

If the coefficient is, then the first sample of the signal X | will go to the first channel of the block 6 for forming and analyzing the estimates,

(th sample signal Xp,, in the third. - (2K + 1) -and signal count,., in the i (I - 1) K + P th count signal X

Thus, at the end of the first signal period, an integer is obtained.

part from - counts. If the numbers N and K do not have odrnj ix integer divisors, except 1, then for the K periods in mouth 3

The array receives N counts, with one count falling into each of the N channels. Due to the fact that the input signal is periodic, discrete samples with the same numbers, taken at different periods, differ only in the amount due to interference, and therefore it does not matter what period the sample is received with the corresponding number.

On the next cycle, corresponding to K periods, the unit receives N counts, with each channel of the formation unit 6

(i-l) K + l, if (i-l) (1-1) K + 1-K, if (i-l)

AI; 2Nl

(1-1) K + 1- (K-1) K if (i-l) K + I + 1C- (K-1) N + 1; KN

where j is the line number; i is the column number. N and K should not have common integer dividers, except 1. In this case, each input l is connected to one output j. The signal recovery block 7 reorders the array of estimates in such a way that the first estimate goes to the first input of the recorder 8, the second to the second input, to

 - and entrance,

Thus, the proposed device makes it possible to increase the duration of a signal sampling time with a fixed number of samples per second.

03А52

and analysis of the estimates comes counting with the same number as in previous K periods. For several cycles, the number of which depends on the signal-to-noise ratio, the unit 6 for the formation and analysis of the estimates determines all N estimates. The estimates through the signal recovery unit 7 are fed to the inputs of the recorder 8. Depending on the code combination corresponding to the frequency division factor K supplied to the inputs of the decoders 10, one of the switches 9 is activated in each column,

(5 and the decoders convert the code K in such a way that

 period and a constant operating frequency or increase the range of operating frequencies with a constant duration of the sampling clock. The expansion of the frequency range allows you to increase

30 functionality and information content of the equipment, and also provides the ability to work by the methods of charge and inductive. Due to the fact that the time between receipt

35 discrete samples with the same numbers per channel of the forming and evaluating unit are increased by a factor of K; more complex and more efficient estimation algorithms can be used.

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Compiled by I. Abramova Editor V. Petrash Tehred T. Dubinchak Proofreader V. But ha

Order 8411/48 Circulation 747 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, Proektna St., 4

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The outputs of FIG. g

Claims (2)

1. DEVICE FOR THE DAY OF PRELIMINARY PROCESSING OF ELECTRIC EXPLORATIONS — NEW SIGNALS according to ed. No. 983620, characterized in that, in order to expand the operating frequency range to a higher frequency region by changing the sampling procedure of the measured signal, two frequency dividers and a signal recovery unit are introduced into it, and the input of the first frequency divider is connected to the first output of the control circuit, and the output is connected to the second input of the unit for forming and analyzing estimates and to the control input of the input unit, the input of the second frequency divider is connected to the second output of the control circuit, and its output to the third input of the block f rmirovaniya analysis and estimates information restoring unit inputs a signal coupled to information outputs of the block for forming and analyzing estimates, and its outputs are connected to data inputs of the recorder, the control inputs of dividers purity and recovery unit connected to the signal input of the second device. 2. The device according to claim 1, characterized in that the signal recovery unit contains N switch groups of N switches in each group and N decoders, and all information inputs of the switches from the <-th column are connected to the 1st input of the signal recovery unit, and all the outputs of the switches from the jth row are connected to the jth output of the signal recovery unit, the control inputs of the switches from? —Th column is connected to the corresponding outputs of the ith decoder, all inputs of the decoders are connected to the second input of the device. SU .., 1203452