Digitized stratum echo signal simulator

Abstract

The invention discloses a digital formation echo signal emulator, which comprises the following parts: inner synchronizing signal output source, DDS integrated circuit, controller and multiplier, wherein the inner synchronizing signal output source connects the controller electrically, which provides a synchronizing pulse to the external equipment; the synchronizing pulse polarity and pulse breadth can be set according to the need; the DDS integrated circuit adjusts the amplitude of output signal; the controller sets the output signal frequency of DDS integrated circuit through the control line and outputs an analog signal to control sine wave amplitude of DDS integrated circuit, which sends the control signal of position information for analog multiplier; the input of multiplier contains two paths; one path comes from the output of DDS integrated circuit; the other path come from the position information control signal of controller; the multiplier proceeds the multiplication calculation of two paths, which outputs the signal.

Description

technical field [0001] The invention relates to a signal simulator, in particular to a digital formation echo signal simulator which is applied in the development and production process of geological sonar and uses modern electronic technology to generate simulated formation echo signals. Background technique [0002] At present, in various types of geological sonar, such as formation profiler, depth sounder and other sonar equipment for detecting various depths, it is often necessary to test the equipment in the laboratory to check whether the expected technical indicators are met. Or product performance indicators, this process needs to give a test signal to the device to be tested. The test signal commonly used at present is realized by adding the keying signal with the common signal source. The signal source can be an ordinary signal generator commonly used in the laboratory; the function of the keyer is to truncate the continuous signal sent by the signal source into a...

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Problems solved by technology

However, the period and amplitude of this test signal are fixed. Even if it is played back repeatedly, the obtained test signal is just a repetition of a segment of the signal without any change or universality. It is inconvenient to use.

[0004] At present, there is no special signal source or simulator specially used for geological sonar debugging on the market. Common signal sources are usually used, which is inconvenient to use and does not have the structural characteristics and time domain characteristics of formation echoes.

Fig. 2 is the signal waveform structure of the simulated formation echo produced by a digital formation echo signal simulator proposed by the present invention. Comparing waveforms Fig. 1 and Fig. 2, it is not difficult to see that the common signal source plus keying mode provides the simulation The signal amplitude is constant, and generally only one echo signal can be output under each trigger (because the amplitude is constant, it does not have much practical significance to output the second signal), which is far from the actual situation.

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