SU1226376A1 - Multichannel storage seismic station - Google Patents

Abstract

The accumulation seismic station is intended for recording seismic signals from weak influences against the background of intense and various interferences, for example, in marine seismic exploration using the method of refracted waves using non-explosive excitation sources. The invention makes it possible to increase the signal-to-noise ratio by using the median method of accumulation implemented by the input of switching unit 5 and comparison unit 14. This eliminates the harmful effect of certain types of interference such as heavy tails, drastically reducing the quality of drive operation. summation. 2 hp f-ly, 1 ill. yu ke O5 with about

Description

The invention relates to seismic survey equipment, namely, to buoy and autonomous bottom seismic stations, and is intended to record seismic signals from weak impacts against the background of intense and various interferences, for example, during seismic exploration using the method of refracted waves using non-explosive sources of excitation,

The goal of the invention is to improve the noise immunity of the seismic station.

The drawing shows a block diagram of the cumulative seismic.

The accumulation seismic station contains a series-connected seismic receiver 1, an amplifier and filters 2, an analog-to-digital converter (ADC) 3, a block 4 of memory. The number of outputs of the memory block corresponds to the number of accumulated signal records. The outputs of the memory block 4 are connected to the inputs of the switching unit 5, which contains the first switch 6, the second switch 7, counters 8 and 9, decoders 10 and 11, the inputs and outputs of the switches are respectively the inputs and outputs of the switch unit, and. The output of the first switch 6 is connected to the recorder 12 and the input 13 of the comparator unit 14, the output of the second switch 7 is connected to the input 15 of the comparator unit 14. Comparison unit 14 comprises a first comparator 16, a counter 17 and a second comparator 18, the inputs of the first comparator 16 are the inputs of the comparison unit 14, and the output of the second comparator 18 is the output of the comparison unit 14. The output of the comparison unit 14 is connected to the input of the counter 8.

The device works as follows.

Seismic signals are fed to seismic receiver 1, amplified and filtered in device 2.0. Next, the signals are converted into a digital code and synchronized in time in ADC 3. Information corresponding to synchronized records of seismic signals goes to memory block 4, which consists of a number of individual memory devices, the number of which corresponds to the number of accumulated signal records. Upon filling the memory block 4, the synchronous output at discrete time points of the information stored in block 4 is performed.

the memory that goes to the corresponding information inputs of the block 5; The operation of the switches 6 and 7 is controlled by counters 8 and 9, the outputs of which through the corresponding decoders 10 and 11 are connected to the control inputs of the switches 6 and 7. From the outputs of the latter, the signals go to the first comparator 16 of the comparator unit 14, by which the signals at its inputs 13 and 15 are compared.

The signal comparison is performed in the following sequence. First input of memory block 4 is connected to input 13 of comparator 16. Through this switch, all other outputs of memory 4 are alternately connected to input 15 of comparator 16 using switch 7, then a second output of the block is connected to input 13 of comparator 16 the memory and the alternate connection to the input 15 of the comparator 16 of all the other outputs of the memory block, etc., occurs again. The counter 17, which is set to state O before connecting the next output of the memory unit to input 13 of the comparator 16, records the number of times that the signal at input 13 of the comparator 16 signals at its input 15 is exceeded, which is compared with the number of the second comparator 18. -t- where N is the number of accumulated records. If the signal at input 13 of the comparator 16 exceeds the signals at its

:, g N -1

I5 input is exactly -5-

times then the output

the second comparator 18 generates a logical signal that arrives at the counting input of the counter 8 and by which the current state of the counter 8 of the switching unit 5 is given. In this case, through the switch 6, the output of the switch 7 receives a signal from that of the storage devices, at the output of which the signal value for a given time point is taken as the value of the accumulated seismic signal. Further, the operation cycle of the device is repeated for the next discrete point in time. The counting input of the counter 8 is simultaneously the counting input of the switching unit 5, and the output of the switch 6 is the output of the device.

Claims (1)

Invention Formula 1, Multichannel cumulative seismic station, each channel of which contains a series-connected seismic receiver, an amplifier and a filter, and also includes a series-connected channel switch, analog-to-digital converter and a memory unit, as well as a recorder, which is designed to improve immunity , a switching unit and a comparison unit are entered into it, while the outputs of the memory unit are connected to the information inputs of the switching unit, the counting input of which is connected to the output of the unit being compared First and second inputs connected to outputs pervym- and second switching unit, wherein the first switching unit is connected to the output unit according to claim registra2 .Seysmostantsi. 1, on t l u sistent with the fact that the commutator unit 263764 contains first and second switches, the first and second counters, the first and second decoders, the outputs of the first and second counters 5 are connected to the inputs of the first and second decoders, respectively, the outputs of the decoders are connected to the control inputs of the respective switches, information inputs The 0 switches are the information inputs of the switching unit, the first inputs of the meters are connected to the control circuit, and the second input of the first counter is the counting input of the switching unit. 3. The seismic station of claim 1, wherein the comparison unit comprises a first comparator, a counter and a second comparator, sequentially connected, the inputs of the first comparator being the inputs of the comparison unit, and the output of the second parator - the output of the comparison unit.