阅读说明：本技术 一种多通道电磁计程仪的速度误差抑制方法及抑制系统 (Speed error suppression method and suppression system of multi-channel electromagnetic log ) 是由 宋厦 兰仪凤 于 2020-12-09 设计创作，主要内容包括：本发明涉及到一种多通道电磁计程仪的速度误差抑制系统,该系统包括有主机、电磁传感器和显示应用端,多个电磁传感器分别设置于船体的两舷侧,该多个电磁传感器分别连接并输入数据至所述的主机,该主机处理数据并将处理后数据输出至显示应用端；主机内设有电路板,电路板上布置有采样板卡、信号预处理板卡、数字信号处理板卡、输出接口板卡、主控制板卡和电源板卡,所述的数字信号处理板卡内设有原始信号评估模块、数字滤波模块、原始速度获取模块、原始速度交织模块和误差抑制校准模块；本发明还涉及到速度误差抑制方法。本发明的方法和系统大大降低设备随机误差,提高了整个电磁计程仪运算结果的鲁棒性,从而得到更稳定的航速。(The invention relates to a speed error suppression system of a multi-channel electromagnetic log, which comprises a host, electromagnetic sensors and a display application end, wherein the electromagnetic sensors are respectively arranged on two side sides of a ship body, the electromagnetic sensors are respectively connected with and input data to the host, and the host processes the data and outputs the processed data to the display application end; the host is internally provided with a circuit board, a sampling board card, a signal preprocessing board card, a digital signal processing board card, an output interface board card, a main control board card and a power supply board card are arranged on the circuit board, and an original signal evaluation module, a digital filtering module, an original speed acquisition module, an original speed interweaving module and an error suppression calibration module are arranged in the digital signal processing board card; the invention also relates to a speed error suppression method. The method and the system greatly reduce the random error of the equipment and improve the robustness of the operation result of the whole electromagnetic log, thereby obtaining more stable navigational speed.)

1. A speed error suppression system of a multi-channel electromagnetic log is characterized by comprising a host, electromagnetic sensors and a display application end, wherein the electromagnetic sensors are respectively arranged on two side sides of a ship body, the electromagnetic sensors are respectively connected with and input data to the host, the host processes the data and outputs the processed data to the display application end, and the display application end is a crew observation screen or navigation equipment;

the host is internally provided with a circuit board, a sampling board card, a signal preprocessing board card, a digital signal processing board card, an output interface board card, a main control board card and a power supply board card are arranged on the circuit board, the electromagnetic sensors are respectively connected to the sampling board card for AD data sampling, the signal preprocessing board card is used for processing an analog signal and converting the analog signal into a digital signal, the digital signal processing board card is used for speed error suppression processing, and the output interface board card is connected to a display terminal or navigation equipment;

an original signal evaluation module, a digital filtering module, an original speed acquisition module, an original speed interweaving module and an error suppression calibration module are arranged in the digital signal processing board card;

the original signal evaluation module receives an original waveform signal and analyzes high and low frequency components and a signal-to-noise ratio of an electrode signal;

the digital filtering module performs low-pass filtering on the original signal;

the original speed acquisition module is used for calculating and acquiring original instantaneous speed after inputting an original waveform;

the original speed interweaving module interweaves the obtained multi-channel original instantaneous speed to obtain an original instantaneous speed array;

and the error suppression calibration module calculates the original instantaneous speed array obtained after interweaving to obtain the fused speed, wherein the speed is the output ship navigational speed value.

2. The system of claim 1, wherein each of the plurality of electromagnetic sensors corresponds to one channel, signals obtained by each channel sequentially pass through an original signal evaluation module, a digital filtering module and an original speed acquisition module, the plurality of channels are collected into the same original speed interweaving module after the corresponding original speed acquisition module, and the interweaved arrays are input into the error suppression calibration module for calculation and output.

3. The system of claim 1, wherein the electromagnetic sensor collects a tachometer sinusoidal voltage signal having a signal amplitude of 300 MV.

4. The system of claim 1, wherein the raw signal evaluation module performs a fast fourier transform on the raw sampled waveform to analyze a signal magnitude spectrum of a 50HZ spectral line.

5. The system as claimed in claim 1, wherein the digital filtering module employs butterworth 3 low-pass digital filtering with a cut-off frequency of 50HZ and a pass band fluctuation of 3DB to obtain the original signal with high frequency components filtered.

6. According to claimThe system for suppressing the speed error of the multi-channel electromagnetic log of claim 1 is characterized in that the original speed interweaving module interweaves multi-channel original speed measurement values to ensure that the interweaving speed is the same time speed; at each 1 time point, obtaining corresponding two-channel electromagnetic speed measurement data respectively as V_C1nAnd V_C2n(ii) a Wherein C1 represents channel 1, C2 represents channel 2, and n represents the nth speed measurement instant at this time point;

interweaving two groups of speed measurement data to obtainTwo groups of speeds are interwoven into 1 group of speed instant values, and similarly, if a plurality of groups of speeds exist, analogy can be carried out, wherein i represents the number of speed measurement value points of a single channel at a certain moment.

7. The system of claim 1, wherein the error suppression calibration module sets a window size W to align the interleaving speeds V_C3Averaging V of the velocity values over the intermediate window_avr；

Calculating V_C3For each speed point to V_avrResidual error r of_i＝V_C3n-V_avr n＝1，2，…2i；

Calculating the median value u_n，

Where s is max ([ 0.150.015V)_avr])

And (3) calculating the speed weight according to the intermediate value:

for the interleaved velocity array V_C3nPerforming weighted averagingWherein the content of the first and second substances,is the final output fusion speed.

8. A speed error suppression method of a multi-channel electromagnetic log is characterized by comprising the following steps:

the method comprises the steps that firstly, two or more channels of navigational speed sensors arranged on a ship are opened simultaneously, the navigational speed sensors are connected to an electromagnetic log, and navigational speed measurement instant data of the channels are obtained simultaneously;

secondly, inputting a plurality of channel navigational speed measurement values obtained through the plurality of speed measurement channels in the first step into an electromagnetic log and storing the channel navigational speed measurement values into a memory;

thirdly, interweaving a plurality of channel instantaneous navigational speed values at the same time to obtain a new one-dimensional array, and sequencing the interwoven one-dimensional array;

fourthly, taking N values in the middle of the navigational speed sequence to obtain the average navigational speed in the sequence as the reference navigational speed;

fifthly, calculating the residual between each value in the sequence and the average navigational speed to obtain a plurality of groups of residual series, calculating the plurality of groups of residual series, multiplying each residual value by 0.015 to obtain a residual intermediate value sequence, and if the obtained number is more than 0.15, obtaining an intermediate value B_iIs 3/median A_iIf the obtained value is less than 0.15, the intermediate value B_i3/0.15, thereby obtaining a plurality of groups of intermediate value sequences;

sixthly, calculating a plurality of groups of speed weight values C_iThe obtained intermediate value B_iWhen the modulus of B is larger than 1, C is larger than 1_i＝(1-B_i ²)²Otherwise, C is 0;

and seventhly, carrying out weighted average on the measured navigational speed and the weight to obtain a final output navigational speed value.

9. The method for suppressing the speed error of the multi-channel electromagnetic log according to claim 8, wherein the seventh step is to output the speed of the electromagnetic log fused by a plurality of channel speeds, and the speed is outputted to a crew for observation or used by a navigation system device.

Technical Field

The invention relates to the field of navigation, in particular to a speed error suppression method and a speed error suppression system based on a multi-channel electromagnetic log.

Background

The electromagnetic log utilizes the Faraday electromagnetic induction principle, that is, when a conductor with the length of L moves at the speed of V in a magnetic field with the magnetic induction intensity of B, an induced electromotive force E is generated on the conductor, and the magnitude of the induced electromotive force E is in direct proportion to the magnitude of the moving speed of the conductor relative to the magnetic field. The magnetic field is generated by an exciting coil wound on an iron core in a measuring rod (or a planar sensor), and a conductor is formed by connecting two electrodes in the sensor with water, so that a ship moves relative to the water at a speed V. If the ship is considered as stationary, namely water moves relative to the ship, namely the conductor moves relative to the magnetic field, so that induced potential is generated between two electrodes of the sensor, the induced potential is converted into a speed voltage signal through two electrode leads and a comparison transformer, the speed voltage signal is sent to a speed calculation system, and the speed value is calculated. The speed processing method is usually a speed calibration, and the inherent speed deviation is calibrated by calculating coefficients after the influence of the flow speed is counteracted by forward and backward directions.

The electromagnetic log in the prior art uses a single sensor, a plane sensor or a rod sensor, the plane sensor has a simple structure, but the electromagnetic log is greatly influenced by a boundary layer, has large fluctuation and has obvious cavitation phenomenon under the condition of high speed because the electromagnetic log measures the relative navigational speed of the relative motion of a ship body and water close to the ship body; the rod sensor has a complex structure, and the rod sensor extends out of the ship to a certain depth to avoid the influence of a boundary layer, so that more stable navigational speed can be obtained. In the process of actually using the electromagnetic log, different speed measurement conditions can be met due to different installation positions of the electromagnetic sensor in a real ship, in the high-speed movement of the real ship, the Bernoulli phenomenon can cause air in seawater to be released by pressure difference so as to block partial sensor electrodes, at the moment, the speed measurement and speed dropping phenomenon can occur to a single sensor, and the phenomenon is called as abnormal speed measurement caused by the cavitation phenomenon of the electromagnetic log.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a speed error suppression method and a speed error suppression system based on a multi-channel electromagnetic log. The method and the system can greatly reduce the random error of the equipment, improve the robustness of the operation result of the whole electromagnetic log and obtain more stable navigational speed.

In order to achieve the purpose of the invention, the technical scheme provided by the invention patent is as follows:

a speed error suppression system of a multi-channel electromagnetic log is characterized by comprising a host, electromagnetic sensors and a display application end, wherein the electromagnetic sensors are respectively arranged on two side sides of a ship body, the electromagnetic sensors are respectively connected with and input data to the host, the host processes the data and outputs the processed data to the display application end, and the display application end is a crew observation screen or navigation equipment;

the host is internally provided with a circuit board, a sampling board card, a signal preprocessing board card, a digital signal processing board card, an output interface board card, a main control board card and a power supply board card are arranged on the circuit board, the electromagnetic sensors are respectively connected to the sampling board card for AD data sampling, the signal preprocessing board card is used for processing an analog signal and converting the analog signal into a digital signal, the digital signal processing board card is used for speed error suppression processing, and the output interface board card is connected to a display terminal or navigation equipment;

an original signal evaluation module, a digital filtering module, an original speed acquisition module, an original speed interweaving module and an error suppression calibration module are arranged in the digital signal processing board card;

the original signal evaluation module receives an original waveform signal and analyzes high and low frequency components and a signal-to-noise ratio of an electrode signal;

the digital filtering module performs low-pass filtering on the original signal;

the original speed acquisition module is used for calculating and acquiring original instantaneous speed after inputting an original waveform;

the original speed interweaving module interweaves the obtained multi-channel original instantaneous speed to obtain an original instantaneous speed array;

and the error suppression calibration module calculates the original instantaneous speed array obtained after interweaving to obtain the fused speed, wherein the speed is the output ship navigational speed value.

In the speed error suppression system of the multi-channel electromagnetic log, each electromagnetic sensor corresponds to one channel, signals obtained by each channel sequentially pass through an original signal evaluation module, a digital filtering module and an original speed acquisition module, multiple channels are gathered into the same original speed interweaving module after the corresponding original speed acquisition module, and the interweaved arrays are input into an error suppression calibration module for calculation and output.

In the speed error suppression system of the multi-channel electromagnetic log, the voltage signal of the speed measurement sinusoidal electrode acquired by the electromagnetic sensor has a signal amplitude of 300 MV.

In the speed error suppression system of the multi-channel electromagnetic log, the original signal evaluation module carries out fast Fourier transform on an original sampling waveform and analyzes a signal amplitude spectrum of a spectral line of 50 HZ.

In the speed error suppression system of the multi-channel electromagnetic log, the digital filtering module adopts Butterworth 3-order low-pass digital filtering, the cut-off frequency is 50HZ, and the passband fluctuates 3DB to obtain an original signal from which a high-frequency component is filtered.

In the speed error suppression system of the multi-channel electromagnetic log, the original speed interweaving module interweaves multi-channel original speed measurement values to ensure that the interweaving speed is the same time speed; at each 1 time point, obtaining corresponding two-channel electromagnetic speed measurement data respectively as V_C1nAnd V_C2n(ii) a Wherein C1 represents channel 1, C2 represents channel 2, and n represents the nth speed measurement instant at this time point; interweaving two groups of speed measurement data to obtainTwo groups of speeds are interwoven into 1 group of speed instant values, and similarly, if a plurality of groups of speeds exist, analogy can be carried out, wherein i represents the number of speed measurement value points of a single channel at a certain moment.

In the speed error suppression system of the multi-channel electromagnetic log, the size W of a window is set in an error suppression calibration module, and the sequenced interleaving speed V is_C3Averaging speed values of intermediate window sizeValue V_avr；

Calculating V_C3For each speed point to V_avrResidual error r of_i＝V_C3n-V_avrn is 1, 2, … 2 i; calculating the median value u_n，

Where s is max ([ 0.150.015V)_avr])

And (3) calculating the speed weight according to the intermediate value:

for the interleaved velocity array V_C3nPerforming weighted averagingWherein the content of the first and second substances,is the final output fusion speed.

The invention also relates to a speed error suppression method of the multi-channel electromagnetic log, which is characterized by comprising the following steps:

the method comprises the steps that firstly, two or more channels of navigational speed sensors arranged on a ship are opened simultaneously, the navigational speed sensors are connected to an electromagnetic log, and navigational speed measurement instant data of the channels are obtained simultaneously;

secondly, inputting a plurality of channel navigational speed measurement values obtained through the plurality of speed measurement channels in the first step into an electromagnetic log and storing the channel navigational speed measurement values into a memory;

thirdly, interweaving a plurality of channel instantaneous navigational speed values at the same time to obtain a new one-dimensional array, and sequencing the interwoven one-dimensional array;

fourthly, taking N values in the middle of the navigational speed sequence to obtain the average navigational speed in the sequence as the reference navigational speed;

fifthly, calculating the residual between each value in the sequence and the average navigational speed to obtain a plurality of groups of residual series, calculating the plurality of groups of residual series, multiplying each residual value by 0.015 to obtain a residual intermediate value sequence, and if the obtained number is more than 0.15, obtaining an intermediate value B_iIs 3/median A_iIf the obtained value is less than 0.15, the intermediate value B_i3/0.15, thereby obtaining a plurality of groups of intermediate value sequences;

sixthly, calculating a plurality of groups of speed weight values C_iThe obtained intermediate value B_iWhen the modulus of B is larger than 1, C is larger than 1_i＝(1-B_i ²)²Otherwise, C is 0;

and seventhly, carrying out weighted average on the measured navigational speed and the weight to obtain a final output navigational speed value, outputting the speed through an electromagnetic log fused by a plurality of channel speeds, and outputting the speed to a crew for observation or for navigation system equipment.

Based on the technical scheme, the speed error suppression method and the suppression system based on the multi-channel electromagnetic log have the following technical effects through practical use:

1. by the application of the speed error suppression method and the suppression system based on the multi-channel electromagnetic log, the system can fuse the speed through the configuration of a plurality of electromagnetic sensors, so that the speed measurement singular value is eliminated, the equipment random error of the electromagnetic log can be greatly reduced, and at least one order of magnitude can be reduced;

2. by applying the speed error inhibition method and the inhibition system based on the multi-channel electromagnetic log, the robustness of the operation result of the whole electromagnetic log can be improved, wild points generated by uncertain factors in the navigation process can be eliminated, and the overall precision of equipment can be improved.

3. By applying the speed error inhibition method and the inhibition system based on the multi-channel electromagnetic log, the error normal distribution curve can be steepened, the error of a 90% confidence interval is distributed in the range of +/-0.1 Kn navigational speed error, and the overall accuracy grade of equipment is improved.

4. The speed error suppression system based on the multi-channel electromagnetic log can also play a role in low frequency enhancement, and the stabilized navigational speed can help the observation of actual navigation personnel.

Drawings

FIG. 1 is a schematic diagram of the system components of a speed error suppression system based on a multi-channel electromagnetic log according to the present invention.

FIG. 2 is a schematic diagram of the hardware and software components of a speed error suppression system based on a multi-channel electromagnetic log according to the present invention.

FIG. 3 is a flow chart of a speed error suppression method based on a multi-channel electromagnetic log according to the present invention.

Fig. 4 is a diagram of an original single-channel original velocity of electromagnetic velocimetry in an embodiment of the present invention.

FIG. 5 is a velocity diagram after fusion using the method and system of the present invention.

FIG. 6 is a diagram illustrating a single-channel raw velocity in the presence of a measurement outlier in an embodiment of the present invention.

FIG. 7 is a velocity diagram of the present invention after fusion in the presence of outliers using the method and system of the present invention.

Detailed Description

The method and system for suppressing speed error of multi-channel electromagnetic log according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, so as to clearly understand the structure, composition and operation of the system, but the scope of the present invention is not limited thereto.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a system for suppressing a speed error based on a multi-channel electromagnetic log according to the present invention. The speed error suppression system of the multichannel electromagnetic log comprises a host, electromagnetic sensors and a display application end, wherein the electromagnetic sensors are respectively arranged on two side sides of a ship body, the electromagnetic sensors are respectively connected with and input data to the host, the host processes the data and outputs the processed data to the display application end, and the display application end is a crew observation screen or navigation equipment.

FIG. 2 is a schematic diagram of the hardware and software components of a speed error suppression system based on a multi-channel electromagnetic log according to the present invention. The host computer in be equipped with the circuit board, arranged sampling integrated circuit board, signal preprocessing integrated circuit board, digital signal processing integrated circuit board, output interface integrated circuit board, main control integrated circuit board and power integrated circuit board on the circuit board, electromagnetic sensor is connected to the sampling integrated circuit board respectively and carries out AD data sampling, signal preprocessing integrated circuit board carry out analog signal and handle and convert digital signal into, carry out speed error suppression in the digital signal processing integrated circuit board and handle, output interface integrated circuit board be connected to display terminal or navigation equipment.

The digital signal processing board card is internally provided with an original signal evaluation module, a digital filtering module, an original speed acquisition module, an original speed interweaving module and an error suppression calibration module.

And the original signal evaluation module receives the original waveform signal and analyzes the high-low frequency component and the signal-to-noise ratio of the electrode signal.

The digital filtering module performs low-pass filtering on the original signal.

The original speed acquisition module is used for calculating and acquiring original instantaneous speed after inputting an original waveform.

The original speed interweaving module interweaves the obtained multi-channel original instantaneous speed to obtain an original instantaneous speed array.

And the error suppression calibration module calculates the original instantaneous speed array obtained after interweaving to obtain the fused speed, wherein the speed is the output ship navigational speed value.

In the speed error suppression system of the multi-channel electromagnetic log, each electromagnetic sensor corresponds to one channel, signals obtained by each channel sequentially pass through an original signal evaluation module, a digital filtering module and an original speed acquisition module, multiple channels are gathered into the same original speed interweaving module after the corresponding original speed acquisition module, and the interweaved arrays are input into an error suppression calibration module for calculation and output.

In the speed error suppression system of the multi-channel electromagnetic log, the voltage signal of the speed measurement sinusoidal electrode acquired by the electromagnetic sensor has a signal amplitude of 300 MV.

In the speed error suppression system of the multi-channel electromagnetic log, the original signal evaluation module carries out fast Fourier transform on an original sampling waveform and analyzes a signal amplitude spectrum of a spectral line of 50 HZ.

In the speed error suppression system of the multi-channel electromagnetic log, the digital filtering module adopts Butterworth 3-order low-pass digital filtering, the cut-off frequency is 50HZ, and the passband fluctuates 3DB to obtain an original signal from which a high-frequency component is filtered.

In the speed error suppression system of the multi-channel electromagnetic log, the original speed interweaving module interweaves multi-channel original speed measurement values to ensure that the interweaving speed is the same time speed; at each 1 time point, obtaining corresponding two-channel electromagnetic speed measurement data respectively as V_C1nAnd V_C2n(ii) a Wherein C1 represents channel 1, C2 represents channel 2, and n represents the nth speed measurement instant at this time point; interweaving two groups of speed measurement data to obtainTwo groups of speeds are interwoven into 1 group of speed instant values, and similarly, if a plurality of groups of speeds exist, analogy can be carried out, wherein i represents the number of speed measurement value points of a single channel at a certain moment.

In the speed error suppression system of the multi-channel electromagnetic log, the size W of a window is set in an error suppression calibration module, and the sequenced interleaving speed V is_C3Averaging V of the velocity values over the intermediate window_avr；

Calculating V_C3For each speed point to V_avrResidual error r of_i＝V_C3n-V_avrn is 1, 2, … 2 i; calculating the median value u_n，

Where s is max ([ 0.150.015V)_avr])

And (3) calculating the speed weight according to the intermediate value:

for the interleaved velocity array V_C3nPerforming weighted averagingWherein the content of the first and second substances,is the final output fusion speed.

As shown in fig. 3, fig. 3 is a schematic flow chart of a speed error suppression method based on a multi-channel electromagnetic log according to the present invention. The invention also relates to a speed error suppression method of the multi-channel electromagnetic log, which comprises the following steps:

the method comprises the steps that firstly, two or more channels of navigational speed sensors arranged on a ship are opened simultaneously, the navigational speed sensors are connected to an electromagnetic log, and navigational speed measurement instant data of the channels are obtained simultaneously;

secondly, inputting a plurality of channel navigational speed measurement values obtained through the plurality of speed measurement channels in the first step into an electromagnetic log and storing the channel navigational speed measurement values into a memory;

thirdly, interweaving a plurality of channel instantaneous navigational speed values at the same time to obtain a new one-dimensional array, and sequencing the interwoven one-dimensional array;

fourthly, taking N values in the middle of the navigational speed sequence to obtain the average navigational speed in the sequence as the reference navigational speed;

fifthly, calculating the residual between each value in the sequence and the average navigational speed to obtain a plurality of groups of residual series, calculating the plurality of groups of residual series, multiplying each residual value by 0.015 to obtain a residual intermediate value sequence, and if the obtained number is more than 0.15, obtaining an intermediate value B_iIs 3/median A_iIf the obtained value is less than 0.15, the intermediate value B_i3/0.15, thereby obtaining a plurality of groups of intermediate value sequences;

sixthly, calculating a plurality of groups of speed weight values C_iThe obtained intermediate value B_iWhen the modulus of B is larger than 1, C is larger than 1_i＝(1-B_i ²)²Otherwise, C is 0;

and seventhly, carrying out weighted average on the measured navigational speed and the weight to obtain a final output navigational speed value, outputting the speed through an electromagnetic log fused by a plurality of channel speeds, and outputting the speed to a crew for observation or for navigation system equipment.

According to the velocity chart before the fusion, fig. 4 is a velocity chart before the fusion, fig. 5 is the original velocity information of the navigational speed measured by two actually measured electromagnetic sensor speed measuring channels, and it can be seen from the chart that the fluctuation of the original velocity amplitude of the electromagnetic speed measuring channel NO1 and the original velocity amplitude of the electromagnetic speed measuring channel NO2 is about 30.7 to 29.4 sections, and the fluctuation of the up and down is over 1 section of navigational speed. That is to say, the method and the system of the invention reduce the discreteness of the speed measured by a single sensor after the speed is fused, and the mean square error of the speed measurement is reduced by one order of magnitude, the mean square error of the speed obtained by actual measurement without the operation of the error suppression algorithm is 0.26, and the mean square error of the navigational speed processed by the algorithm is 0.08.

According to the schematic diagrams before and after fusion in the presence of the wild points in fig. 6 and 7, sometimes the speed measurement wild points appear when the ship turns left or turns right or the sea state is severe, and the speed measurement wild points are given, namely speed measurement abnormal points. Fig. 7 shows the original speed information of the navigational speed measured by the two actually measured speed measuring channels of the electromagnetic sensor, and it can be seen from the figure that the original speed of the electromagnetic speed measuring channel NO1 has a large field at the beginning stage, the speed measurement is reduced to about 15 sections of navigational speed due to objective sea conditions and other reasons at the field, the speed value fluctuation is reduced after the fusion of the dual electromagnetic speed measuring channels is obtained by the fused algorithm, the field is filtered, the speed fluctuation range is 30.2 sections to 29.9 sections of navigational speed, and the actual speed measurement standard value is 30 sections. Under the condition that a single channel has speed measurement abnormal points, the abnormal points can be effectively solved through the speed processed by the algorithm, a stable speed measurement result is obtained, the speed measurement precision is improved, and the discreteness is greatly reduced. The data processed by the system of the invention is suitable for the original design requirement of the electromagnetic log and has higher economic value.