CN118567583A - Optical storage system and method for improving reliability of optical storage system - Google Patents

Abstract

The invention provides an optical storage system and a method for improving the reliability of the optical storage system, which relate to the technical field of optical storage systems, and the invention introduces error data set acquisition, environmental factors and physical characteristic data for comprehensive analysis processing on the basis of time shift measurement through integrating a data acquisition module, an index generation module and a model construction module; the method can monitor various interference factors encountered by the optical storage system in the actual use environment in real time, timely generate a displacement evaluation index, an error evaluation index, an environmental impact index and a physical impact index, and generate an impact coefficient rho through correlation analysis; based on the indexes and the coefficients, the threshold fine-tuning model can accurately dynamically adjust a preset threshold, and the data read-write reliability of the optical storage system in a complex environment is remarkably improved.

Description

Optical storage system and method for improving reliability of optical storage system

Technical Field

The present invention relates to the technical field of optical storage systems, in particular to an optical storage system and a method for improving the reliability of an optical storage system.

Background

The optical storage technology, as a big milestone in the information technology field, has undergone multiple technical iterations from CD to DVD to Blu-ray disc since the advent of commercial optical discs in the early 80 th century, and the method for reading and writing data by using the laser technology has become an important means for storing and transmitting large-capacity data by using the high-density energy storage capability and stable data storage performance; with the rapid development of information technology, the optical storage system is continuously optimized and upgraded, and particularly, remarkable progress is made in the aspects of data access speed, storage capacity and data protection mechanism; however, with the increasing storage demands and the increasing complexity of application environments, challenges of conventional optical storage systems in terms of data reliability and access efficiency are also becoming prominent;

Such as chinese patent publication No. CN101268518a, which discloses a method and system for improving reliability in an optical storage system; performing a time shift measurement between two information streams during a write operation of the optical storage system to an optical storage medium such as a CD, DVD, or blu-ray disc; interrupting a writing operation of the optical storage system when the time shift measurement is greater than a predetermined level for detecting irregularities caused by, for example, tangential shock, vibration, eccentricity or unbalance of the optical storage medium during said writing operation; irregularities resulting in defective writing operations are thus detected by the measuring means, the optical storage system being detected very quickly so that the disc is wasted by interrupting recording as soon as there is shock, vibration or the like;

The prior art has the following defects:

Although the existing optical storage system has higher data storage and retrieval efficiency, the data read-write reliability of the system still has obvious defects when facing to the factors such as environmental vibration, temperature and humidity change and the like; particularly in high-precision application scenes, such as the fields of data centers, scientific researches and the like, the relative position offset of a laser head and an optical disc can be caused by small vibration or environmental change, so that focusing errors, radial errors and tracking errors are generated, and the accurate reading and writing of data are seriously influenced; in addition, in the prior art, when the errors are processed, a single time shift measurement often lacks a dynamic adjustment mechanism, and effective threshold fine adjustment cannot be performed according to the real-time environment and physical characteristic changes, so that the adaptability and the reliability of the system are insufficient;

The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

It is an object of the present invention to provide an optical storage system and a method for improving the reliability of an optical storage system, which solve the above-mentioned problems set forth in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions:

An optical storage system, said system comprising a process for performing a time shift measurement, which process is performed when writing data to an optical storage medium and involves an operation between two information streams, comprising in particular:

And a data acquisition module: the system comprises a data acquisition module, a data acquisition module and a data acquisition module, wherein the data acquisition module is used for acquiring time shift measurement data of an optical disc and a laser head at relative positions of the optical disc and the laser head caused by vibration or vibration, acquiring quantifiable parameters related to the time shift measurement data, and an error data set formed by focusing error, radial error and tracking error data, and acquiring a preset threshold value of a disc system when writing operation is interrupted, wherein the preset threshold value is used for comparing with the time shift measurement value, acquiring environmental factor data surrounding the process of reading and writing data by the disc and the laser head, and acquiring physical characteristic data related to the environmental factor data of an optical storage medium;

An index generation module: is used for analyzing and processing after obtaining the quantifiable parameters to generate a displacement evaluation index, the displacement evaluation index is used for judging the displacement degree;

acquiring an error data set for analysis processing to generate an error evaluation index, wherein the error evaluation index is used for judging the error degree of the laser head;

The method comprises the steps of obtaining environmental factor data and material characteristic data, analyzing and processing the environmental factor data and the material characteristic data, and respectively generating an environmental impact index and a physical impact index; performing correlation analysis on the environment influence index and the physical influence index to generate an influence coefficient rho, wherein the influence coefficient rho is used for dividing the correlation degree between the environment influence index and the physical influence index;

model construction module: the method is used for analyzing and processing after acquiring the displacement evaluation index, the error evaluation index and the influence coefficient rho, constructing a threshold fine tuning model and carrying out fine tuning on a preset threshold by the threshold fine tuning model.

A method of improving the reliability of an optical storage system, said method for performing said optical storage system, comprising the steps of:

S1, collecting time shift measurement data of an optical disc and a laser head at the relative positions of the optical disc and the laser head caused by vibration or vibration, collecting a quantifiable parameter related to the time shift measurement data, and an error data set formed by focusing error, radial error and tracking error data, and collecting a preset threshold value of a disc system when writing operation is interrupted, wherein the preset threshold value is used for comparing with a time shift measurement value, collecting environmental factor data around the process of reading and writing data by the disc and the laser head, and collecting physical characteristic data related to the optical storage medium and the environmental factor data;

S2, analyzing and processing after obtaining the quantifiable parameters to generate a displacement evaluation index, wherein the displacement evaluation index is used for judging the displacement degree;

acquiring an error data set for analysis processing to generate an error evaluation index, wherein the error evaluation index is used for judging the error degree of the laser head;

The method comprises the steps of obtaining environmental factor data and material characteristic data, analyzing and processing the environmental factor data and the material characteristic data, and respectively generating an environmental impact index and a physical impact index; performing correlation analysis on the environment influence index and the physical influence index to generate an influence coefficient rho, wherein the influence coefficient rho is used for dividing the correlation degree between the environment influence index and the physical influence index;

And S3, analyzing and processing the displacement evaluation index, the error evaluation index and the influence coefficient rho after obtaining the displacement evaluation index, the error evaluation index and the influence coefficient rho, and constructing a threshold fine tuning model which is used for fine tuning a preset threshold.

Compared with the prior art, the invention has the beneficial effects that: by integrating the data acquisition module, the index generation module and the model construction module, on the basis of time shift measurement, introducing error data set acquisition, environmental factors and physical characteristic data to carry out comprehensive analysis processing; the method can monitor various interference factors encountered by the optical storage system in the actual use environment in real time, timely generate a displacement evaluation index, an error evaluation index, an environmental impact index and a physical impact index, and generate an impact coefficient rho through correlation analysis; based on the indexes and the coefficients, the threshold fine-tuning model can accurately dynamically adjust a preset threshold, and the data read-write reliability of the optical storage system in a complex environment is remarkably improved.

Drawings

FIG. 1 is a block diagram of a system module of the present invention;

FIG. 2 is a schematic flow chart of the whole method of the invention.

Detailed Description

The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.

It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.

Referring to fig. 1 and 2, the present invention provides a technical solution:

Example 1

The invention describes an optical storage system comprising a process for performing a time shift measurement, which process is performed when writing data to an optical storage medium and involves an operation between two information streams, comprising in particular:

And a data acquisition module: the system comprises a data acquisition module, a data acquisition module and a data acquisition module, wherein the data acquisition module is used for acquiring time shift measurement data of an optical disc and a laser head at relative positions of the optical disc and the laser head caused by vibration or vibration, acquiring quantifiable parameters related to the time shift measurement data, and an error data set formed by focusing error, radial error and tracking error data, and acquiring a preset threshold value of a disc system when writing operation is interrupted, wherein the preset threshold value is used for comparing with the time shift measurement value, acquiring environmental factor data surrounding the process of reading and writing data by the disc and the laser head, and acquiring physical characteristic data related to the environmental factor data of an optical storage medium;

Vibration or vibration refers to a motion state in which an object periodically or irregularly moves or swings in space; such movements are caused by external factors, in optical storage systems, shocks or vibrations originate from the operation of the device itself, from the influence of the external environment, or from the operation of surrounding devices, in particular:

operation of the device itself:

mechanical vibration: mechanical components in the optical storage system, such as motors, fans, mechanical arms, generate vibrations during operation, which are caused by rotation, movement or contact between mechanical parts, affecting the stability and data read-write performance of the system;

vibration of the optical component: vibration of laser heads, mirror optics can also affect the operation of the system, especially in scenes where high precision positioning and focusing is required;

Influence of external environment:

floor vibration: ground vibration from earthquakes, mechanical movements or other external factors can be transmitted into the optical storage system, and stability of the system is affected;

Temperature change: the change of temperature can cause the expansion and contraction of materials in the system, so that tiny vibration or deformation is generated, and the performance of the system is influenced;

Humidity change: in a high humidity environment, electronic components are wetted to generate electrical problems, and the operation stability of mechanical components is indirectly affected;

operation of the surrounding devices:

Resonance effect: if the optical storage system is co-installed with other equipment or shares a support structure, resonance effects are generated when other equipment operates, resulting in the vibration aggravation or frequency change of the optical storage system;

mechanical impact: mechanical impact or vibration is generated in the running or operation process of surrounding equipment and is transmitted to the optical storage system to influence the running stability of the optical storage system;

The vibration or vibration causes the relative position between the optical disc and the laser head to change, thereby affecting the accuracy and reliability of data reading and writing;

An index generation module: is used for analyzing and processing after obtaining the quantifiable parameters to generate a displacement evaluation index, the displacement evaluation index is used for judging the displacement degree;

acquiring an error data set for analysis processing to generate an error evaluation index, wherein the error evaluation index is used for judging the error degree of the laser head;

The method comprises the steps of obtaining environmental factor data and material characteristic data, analyzing and processing the environmental factor data and the material characteristic data, and respectively generating an environmental impact index and a physical impact index; performing correlation analysis on the environment influence index and the physical influence index to generate an influence coefficient rho, wherein the influence coefficient rho is used for dividing the correlation degree between the environment influence index and the physical influence index;

model construction module: the method is used for analyzing and processing after acquiring the displacement evaluation index, the error evaluation index and the influence coefficient rho, constructing a threshold fine tuning model and carrying out fine tuning on a preset threshold by the threshold fine tuning model.

Example two

On the basis of the first embodiment, the time shift measurement data is detected by an optical pickup unit in the optical disc system, and the quantifiable parameters include a vibration frequency parameter, a vibration amplitude parameter, a timestamp difference value, a relative speed variation and a track deviation, and the vibration frequency parameter, the vibration amplitude parameter, the timestamp difference value, the relative speed variation and the track deviation are calibrated in order to form a vibration frequency parameter f, a vibration amplitude parameter a and a timestamp difference valueAmount of change in relative speedAnd a track deviation D;

vibration frequency and amplitude: monitoring the vibration or the frequency and the amplitude of the vibration of the optical disc and the laser head; the data directly reflect the intensity and the characteristics of vibration and are an important basis for evaluating the displacement;

timestamp difference: recording the difference between the actual time and the theoretical time taken by the laser head to move from one data point to another, wherein the time stamp difference can reflect the change of the read-write speed caused by displacement;

Relative speed change of laser head and optical disc: monitoring the speed change of the laser head relative to the optical disc, a sudden change in speed often meaning an unexpected displacement;

track deviation degree: calculating the deviation degree of the data read by the laser head and the expected track of the optical disc by analyzing the data read by the laser head, wherein the track deviation degree can directly show whether the laser head is kept on the correct track or not;

the predetermined threshold includes that when the result of the time shift measurement exceeds a predetermined level, i.e., exceeds a predetermined threshold or level, the system interrupts the writing operation to prevent a writing operation defect due to an irregularity;

the preset levels are a rate fluctuation threshold value and a time delay in sequence, and are respectively calibrated to form the rate fluctuation threshold value And time delay；

Rate fluctuation: Operations in optical disc systems need to be performed at a specific rate, such as data transfer, recording speed; the predetermined level may be used to measure the difference between the actual rate and the expected rate; if the rate fluctuation exceeds a predetermined level, which affects the stability and performance of the system, a threshold may be set to monitor the rate fluctuation and trigger a corresponding action, such as interrupting the write operation, if the threshold is exceeded;

Time delay : In the operation of the optical disc system, there is a certain time delay, such as data transmission delay and response time; the predetermined level may be used to measure the difference between the actual delay and the expected delay; if the time delay exceeds a predetermined level, the real-time performance and performance of the system are affected, so that a threshold value can be set to monitor the time delay, and corresponding measures such as adjusting the operation sequence or interrupting the writing operation are taken when the threshold value is exceeded;

in both cases, the predetermined level may be set according to the requirements and performance indicators of the system, determined experimentally, by simulation analysis, or based on historical data; by setting a preset level, the speed fluctuation or time delay existing in the system can be timely found and processed, so that the stability, instantaneity and performance of the system are ensured;

the error data set composed of the focusing error, the radial error and the tracking error data specifically comprises the following contents;

the focus error is the distance deviation between the focal point of the light beam and the surface of the optical disc; when the light beam is not focused enough or focused excessively, a focusing error occurs;

In this embodiment, the focus error is expressed in distance units of millimeters, indicating the distance between the focus and the surface of the optical disc; if the beam is focused on or under the surface of the optical disc, the focus error will be positive or negative;

The focus error calculation formula is expressed as:

Focus error= |focus position-optical disc surface position|; setting F to represent focus position and S to represent CD surface position, the positions being quantized and represented by CD surface distance thickness to make it capable of being used in calculation formula Expressed as:

assuming that the thickness of the surface of the optical disc is 1.2 mm, the focal position is 0 mm; if the focus is located 0.1mm above the surface of the optical disc, the focus error is 0.1 mm; if the focus is located 0.2 mm below the surface of the optical disc, the focus error is-0.2 mm;

the radial error is the offset distance between the beam center and the track center of the optical disc, which should be aligned with the track center to ensure accurate reading of the data;

radial error is expressed in distance units millimeters, representing the distance between the beam center and the track center;

The radial error can be expressed by the following formula:

radial error= |beam center position-track center position|; setting C to the beam center position and T to the track center position, the radial error Can be expressed as:

Assuming that the beam center is aligned with the track center, the radial error is 0 mm; if the beam center is offset from the track center by 0.05 mm, the radial error is 0.05 mm;

Tracking error is the deviation of the light beam when tracking the data track on the optical disc; such errors are typically caused by an offset between the beam and the data track;

tracking error is expressed in units of angle or distance, such as radians or millimeters, representing the deviation between the beam and the data track;

The tracking error can be expressed by the following formula:

Tracking error= |beam trajectory-data track|; setting up Representing the deviation between the beam track and the data track, tracking errorCan be expressed as:

Tracking error is expressed in terms of angle or distance; if the deviation between the beam and the data track is 0.03 mm, the tracking error is 0.03 mm;

These errors can be quantified as a numerical type and can be used in mathematical calculation formulas to evaluate the accuracy and stability of the optical pickup unit when reading the optical disc data;

The environmental factor data comprise a temperature parameter and a humidity parameter, and are calibrated respectively to form a temperature parameter Wd and a humidity parameter Sd;

The optical storage medium is arranged on the optical disc, and the physical characteristic data of the optical storage medium comprise a thermal expansion coefficient and a humidity expansion coefficient, and are respectively calibrated to form the thermal expansion coefficient RPz and the humidity expansion coefficient SPz;

The optical storage medium is a physical medium for storing data, and uses optical technology to read and write the data; the method forms tiny concave-convex or reflectivity change on the surface of a medium through laser, and represents different data bits, such as 0 and 1, so that information storage is realized; when reading data, the laser scans the areas again, and the data bits are distinguished by detecting the change of the reflected light; representative of optical storage media are CD discs, DVD, blu-ray disc;

The thermal expansion coefficient represents the ratio of dimensional changes of the optical storage medium when the temperature changes; the increase or decrease of the temperature can cause the change of the physical size of the optical storage medium, and can influence the read-write precision of data and the physical integrity of the medium;

The coefficient of humidity expansion represents the rate of change of volume or shape of the optical storage medium under a change in humidity; variations in humidity can lead to variations in the physical properties of the optical storage medium, affecting the stability of the medium and the accuracy of the data.

Example III

Further describing the second embodiment, the step of obtaining the quantifiable parameter, and then performing analysis processing to generate a displacement evaluation index, where the displacement evaluation index is used to determine the displacement degree, and specifically includes the following steps;

calibrating the displacement evaluation index as E, and setting a calculation formula of the displacement evaluation index E as follows:

Wherein f is a vibration frequency parameter, A is a vibration amplitude parameter, As the value of the difference in the time stamps,D is the track deviation degree, exp is the abbreviation of exponential, and represents an exponential function;

Parameters (parameters) Is a positive weight coefficient estimated from experimental data or experience,; The method is used for adjusting the influence degree of each parameter on the displacement evaluation index;

By a logarithmic process of weighting the parameters, it can be ensured that the sensitivity of the displacement evaluation index E to the parameters decreases as the parameters increase, which is practical, since slight changes in parameters generally have a more pronounced effect on the system in low-value regions than in high-value regions;

The exponential function in the denominator is used for adjusting the influence of the track deviation degree D, so that when D is increased, the E value is properly increased to reflect the increase of the system displacement, but the speed increase is slowed down along with the increase of D, and the distortion of an evaluation result caused by excessive response of D is avoided;

Parameters (parameters) The sensitivity of D to E is controlled, assuming，Can be adjusted according to actual conditions;

the adjustment mode is specifically that parameters The aim of the adjustment is to control the sensitivity of the track deviation D to the displacement evaluation index E; the following adjustment policies are set:

Wherein, Is currentA value; Is adjusted by A value; Is an adjustment coefficient for controlling the amplitude of the adjustment;

Err is the error term and is defined as WhereinIs an index of evaluation of the target displacement amount,Is the current displacement evaluation index;

This formula shows that, if E is above or below the target value, Correspondingly increasing or decreasing, thereby adjusting the contribution of D to E;

setting the value range of E in Because of the existence of denominator, E tends to be increased to an upper limit and cannot be increased infinitely; in practical application, the practical upper limit threshold of E can be set as by selecting proper weight coefficient and parameter valueExceeding the threshold valueThe displacement is considered to be at an unacceptable level;

When the E value is closer to 0, the influence of vibration or displacement on the system is smaller, and the system is stable; when E is closer to The influence of vibration or displacement on the system is larger, and the vibration needs to be reduced by adjusting the system;

The measures taken to reduce vibration or adjust the system are specifically; taking measures according to the value of E and defining a control strategy, the following control function is used for adjusting the system parameter P:

Wherein, Is the current value of the system parameter; Is the adjusted system parameter value; the learning rate is the learning rate, and the size of the step length is controlled and adjusted; is the derivative of E with respect to P, indicating the rate of change of E as P changes.

Example IV

On the basis of the second embodiment, the obtained error data set is analyzed and processed to generate an error evaluation index, and the error evaluation index is used for judging the error degree of the laser head, and specifically comprises the following contents;

the error evaluation index is defined as Q, and the calculation formula for setting the error evaluation index Q is as follows:

Wherein, Representing focus error; Representing radial error; representing tracking errors; a1, a2, a3 and a4 are adjustment coefficients for adjusting the contribution of the respective error terms; nf, nr, nt are normalization factors, ensuring that the output of the exponential function is within a defined range;

Amplifying the influence of the three errors through an exponential function, and limiting the value range through a normalization function; the adjustment coefficients a1, a2, a3 and a4 and the normalization factors Nf, nr and Nt are required to be determined according to actual data by an experiment or an optimization method, and are set in sequence in the embodiment;

the value range of Q is determined by a1 and a normalization factor; setting the value range of Q as [0, 10], and when Q is close to 0, the error is very small, and the system performance is good; when Q is close to 10, the error of the system is larger, and adjustment and maintenance are needed;

The coefficients a1, a2, a3 and a4 and the normalization factors Nf, nr and Nt need to be determined according to actual data through an experimental or optimization method, and specifically include the following contents:

1. Collecting a number of focus errors in historical data Radial errorAnd tracking errorData of (2); these data should be collected on different operating conditions and different types of optical discs and laser heads;

2. setting the ideal value range of Q as [0,10] so as to facilitate the quantitative evaluation of the error degree;

3. Setting preliminary estimated values for a1, a2, a3, a4, nf, nr, nt; these preliminary values are derived based on theoretical analysis, expert experience, or early small-scale experiments;

4. Adjusting the coefficients using, for example, gradient descent, genetic algorithm, or other optimization algorithm; this process involves minimizing the difference between the error evaluation index Q and the actual system performance;

The optimization objective function is expressed as:

Wherein, Is the error evaluation index of the ith experiment,Is the corresponding system performance parameter, such as the read error rate, N is the number of experiments, the objective of this objective function is to adjust the coefficients a1, a2, a3, a4, nf, nr, nt to give the error evaluation index Q and the actual system performanceThe difference between them is minimized;

5. using a new set of data to verify whether the optimized coefficients can accurately predict the system performance, and if the prediction accuracy is insufficient, re-optimizing is needed;

6. If the value of Q is close to or exceeds 10, the system performance is poor, and adjustment or maintenance is needed; when Q is less than 3, it means that the adjusted a1, a2, a3, a4, nf, nr, nt meet the requirements, and specific measures include adjusting focusing of the laser head, correcting radial and tracking deviations.

Example five

On the basis of the second embodiment, the method further includes the steps that the acquired environmental factor data and the material characteristic data are analyzed and processed to generate an environmental impact index and a physical impact index respectively, wherein the environmental impact index and the physical impact index specifically include the following contents;

Defining environmental impact index as The calculation formula is as follows:

The environmental impact index is intended to quantify the impact of temperature and humidity on the read-write performance of the optical storage medium;

Wherein Wd is a temperature parameter of the current environment, and W0 is a calibrated temperature reference value;

sd is the humidity parameter of the current environment, S0 is the calibrated humidity reference value;

k1 and k2 are adjustment coefficients, and are optimally determined according to experimental data; e is the base of natural logarithms;

The optimization determination of k1 and k2 specifically comprises the following steps:

Firstly, collecting historical performance data of an optical storage medium under different temperature Wd and humidity Sd conditions; the performance data comprises a read-write error rate and a data transmission speed index;

Defining a loss function to quantify the difference between the predicted environmental impact index and the actual observed performance index; the following mean square error MSE is used:

where n is the number of samples and yj is the actual performance index of the jth sample, and Is based onThe calculated prediction performance index;

Adjusting k1 and k2 using a gradient descent method in an optimization algorithm to minimize a loss function; in the optimization process, the algorithm iteratively adjusts the values of k1 and k2 until the minimum value of the loss function is found, and the result is output as the determined k1 and k2;

The formula quantifies the influence of environmental conditions on the performance of an optical storage medium by carrying out normalization processing on the deviation of temperature and humidity parameters; the index part in the formula emphasizes the influence degree of the environmental parameter deviating from the reference value, wherein the adjustment coefficients k1 and k2 are used for adjusting the influence weights of the temperature and the humidity;

Defining the physical impact index as The calculation formula is as follows;

The physical influence index is used for quantifying the influence of the thermal expansion coefficient and the humidity expansion coefficient on the read-write performance of the optical storage medium;

RPz and SPz represent the current thermal expansion coefficient and the humidity expansion coefficient, respectively;

RP0 and SP0 are respective calibration reference values;

by taking the square root of the sum of the squares of these two ratios, the combined impact of the change in physical properties on the performance of the optical storage medium can be quantified;

Setting up The value range is represented as,Distinguishing the performance grade of the optical storage medium under different environments and physical conditions through the value of the value range;

Defining the standard of the performance level and dividing the range:

Low performance representation ; Medium performance representation [ ]) ; High performance representation [ ])；

Wherein I is respectivelyAny one of them;

The generation influence coefficient ρ specifically includes the following contents:

Cosine similarity is used as a measure of two indices The method for calculating the similarity comprises the following steps:

Wherein: h is the number of samples; And The environmental impact index and the physical impact index of the h sample respectively; And Respectively isAndIs a sample mean value of (2);

Cosine similarity is used to measure the degree of similarity of two non-zero vectors in the direction, with a range of values between [ -1,1 ]; in this formula, the ρ is used to measure AndCorrelation between;

defining the value range of rho as [ -1,1]; when ρ is close to 1, it indicates that AndHas strong positive correlation, namely, when the environmental and physical conditions change, they change in the same direction; when ρ approaches-1, it shows a strong negative correlation of both, i.e., one exponentially increases while the other decreases; when ρ approaches 0, it shows little correlation between the two.

Example six

Further describing the third, fourth or fifth embodiment, wherein the displacement evaluation index, the error evaluation index and the influence coefficient ρ are obtained and then analyzed to construct a threshold fine tuning model, and the threshold fine tuning model is used for fine tuning a predetermined threshold, and specifically comprises the following steps of;

introducing said predetermined threshold comprises a rate fluctuation threshold And time delay; Respectively constructing corresponding threshold fine tuning models, wherein the content is as follows;

Setting the rate fluctuation threshold adjustment model as ：

The time delay adjustment model is as follows：

Wherein:

And The raw thresholds of rate fluctuation and time delay, respectively;

And Displacement amount evaluation indexes for rate fluctuation and time delay, respectively;

q is an error evaluation index for rate fluctuation and time delay, respectively;

Z1, Z2, Z3 and Z4 and U1, U2, U3 and U4 are model parameters between 0 and 1, and are adjusted according to actual conditions;

Rate fluctuation threshold adjustment model parameters:

z4 represents an adjustment coefficient for adjusting the overall magnitude of the rate fluctuation threshold adjustment amplitude; increasing Z4 increases the amplitude of the adjustment, and conversely decreases;

Z1 represents a reference adjustment factor for balancing Influence on threshold adjustment, adjustment Z1 can changeThe relative importance in threshold adjustment;

Z2 represents an error evaluation coefficient, is multiplied by an error evaluation index Q, and is used for adjusting a threshold value according to the current error, and increasing Z2 so that the adjustment amplitude is larger under high error, and the sensitivity of the system error to a rate fluctuation threshold value is reflected;

Z3 represents a correlation adjustment coefficient for adjusting a threshold adjustment amplitude due to a change in the correlation ρ, the adjustment amplitude decreasing when ρ approaches 1 or-1; when ρ is close to 0, the adjustment amplitude increases;

Time delay threshold adjustment model parameters:

U4 represents an adjustment coefficient for adjusting the overall magnitude of the time delay threshold adjustment amplitude, and similarly, increasing U4 increases the adjustment amplitude and conversely decreases it;

u1 represents a reference adjustment factor for balancing Influence on threshold adjustment, adjustment U1 can changeThe relative importance in threshold adjustment;

U2 represents an error evaluation coefficient, is multiplied by an error evaluation index Q, and is used for adjusting a threshold value according to the current error, and increasing U2 so that the adjustment amplitude is larger under high error, and the sensitivity of the system error to a time delay threshold value is reflected;

u3 denotes a correlation adjustment coefficient for adjusting a threshold adjustment amplitude due to a change in the correlation ρ in order to adjust the threshold based on the correlation;

the adjusting method comprises the following steps:

data-driven adjustment: through historical data analysis, the parameters are automatically adjusted by using a machine learning method, so that the model is ensured to adapt to different network environments and flow modes;

Experiment adjustment: gradually adjusting the parameters through control experiments such as A/B tests, observing the system performance under different parameter configurations, and finding out the optimal parameter combination;

Dynamic adjustment: in the running process of the system, the parameters are dynamically adjusted according to the real-time system performance index and the network state so as to realize the optimal adjustment effect;

The two models dynamically adjust a rate fluctuation threshold value and a time delay threshold value based on the similarity rho between the environment and the physical index and the values of the displacement evaluation index E and the error evaluation index Q; by adjusting these thresholds, the system can take appropriate action, such as interrupting write operations, to preserve system performance and stability when a rate fluctuation or time delay is found to exceed a predetermined level;

The adjustment strategy for the generation of the threshold fine adjustment model is as follows:

When ρ is close to 1 or-1, it indicates that there is a strong correlation between the environment and the physical index; the upper threshold limits of E and Q are set to E1, in this embodiment 0.7, and the actual upper threshold limit of E is set 1, The value ranges of E and Q which can be obtained by the same method are 0 to 1, when the value of E or Q is larger than E1, namely 0.7, the E and Q are represented to have larger displacement or error, and the model adjusts the original threshold;

setting the value ranges of E and Q to 0-1 respectively, and when the value of E or Q is larger than 0.7, indicating that E or Q has larger displacement or error;

When ρ is close to 0, it shows little correlation between the two indices; at this time, the adjustment of the threshold value mainly depends on the values of E and Q;

Specifically, the rate fluctuation threshold adjustment strategy is as follows:

defining a p near the critical value of 1 or-1 as 0.95 when Or (b)And, when expressed as a proximity state:

Setting up The upper adjustment limit of (2) is 150% of the original threshold value, and the lower limit is 50%; the mathematical expression is:

when rho is close to 0, setting rho close interval as rho epsilon (-0.1,0.1), collecting m1 time points in the past The mean value and the standard deviation are adjusted, if the standard deviation exceeds 30% of the mean value, the sensitivity of threshold adjustment is improved, and the mathematical expression is as follows:

Wherein, Representation ofMean of (2) representing past m1 time pointsAverage level of values; Representation of Represents the standard deviation of past m1 time pointsThe degree of change of the value, Z4 is an adjustment coefficient, and Z4 is 0 or 1, specifically;

When (when) Standard deviation of (2)Exceeding its average valueAt 30%, i.eThe value of the adjustment coefficient Z4 is 1;

Otherwise, i.e. when When the standard deviation of the (B) is not more than 30% of the average value, the value of the adjustment coefficient Z4 is 0;

The purpose of this conditional function is based on Determining whether adjustment of the threshold is required; if the standard deviation exceeds 30% of the mean value, the adjustment coefficient is 1, which indicates that the sensitivity of threshold adjustment needs to be improved; otherwise, the adjustment coefficient is 0, which means that no additional adjustment is performed;

time delay threshold adjustment strategy, when ρ approaches ±1 when there is a strong correlation:

A dynamic factor based on p is added, U4 times; the mathematical expression is:

when ρ approaches 0, a measurement based on the last m2 measurements is introduced An adjustment coefficient of the rate of change;

if the change rate exceeds 20%, increasing the flexibility of threshold adjustment; the mathematical expression is as follows:

Wherein, Representation ofIs a rate of change of (2); representing the last m2 measurementsThe degree of change in the value;

0.20 represents a 20% change rate and is set as a reference value if If the change rate of (2) exceeds 20%, the threshold value is required to be adjusted;

according to given conditions, if If the change rate of (2) exceeds 20%, the value of the adjustment coefficient U4 is 1, which means that the flexibility of threshold adjustment needs to be increased; otherwise, the value of the adjustment coefficient U4 is 0, which means that no additional adjustment is performed.

Example seven

Further explanation is provided on the basis of the sixth embodiment,

In the present embodiment, the objective is to verify the effectiveness and innovativeness of the proposed adjustment model of the rate fluctuation threshold and the time delay threshold; the experimental design comprises two parts: one part adjusts the model for the rate fluctuation threshold and the other part adjusts the model for the time delay threshold; the experimental environment is set in the simulated network system, and the error evaluation index Q and the displacement evaluation index are changed、And similarity ρ between the environment and the physical index to observe the response of the threshold adjustment model;

and (3) setting up an environment: constructing a virtual network environment, wherein the virtual network environment comprises a simulation generator with variable network load, displacement evaluation indexes and error evaluation indexes Q;

parameter setting: setting the original rate fluctuation threshold And a time delay thresholdSetting initial values of Z1, Z2, Z3, Z4, U1, U2, U3 and U4 according to model requirements;

and (3) data collection: generating different network states, including different ρ, 、And Q value, record speed fluctuation threshold and time delay threshold before and after the model is adjusted;

The experimental steps are as follows:

Rate fluctuation threshold adjustment: under the condition that the rho value is close to +/-1 and 0 respectively, different simulation is carried out And Q value, apply the speed fluctuation threshold value to adjust the model, observe and record the adjustment condition of the threshold value;

In particular, when ρ >0.95 or ρ < -0.95, it is verified whether the threshold is adjusted according to the set upper and lower limits; when ρ approaches 0, the past m1 time points are acquired The average value and the standard deviation are subjected to adjustment reaction of a detection threshold;

Time delay threshold adjustment:

Under the condition that the rho value is close to +/-1 and 0 respectively, different simulation is carried out And Q value, apply the time delay threshold value to adjust the model, observe and record the adjustment condition of the threshold value;

When ρ approaches ±1, checking if ρ -based dynamic factor adjustment is increased; when ρ approaches 0, based on the last m2 measurements The adjustment coefficient of the change rate verifies the flexibility of threshold adjustment;

Experiment optimization:

in order to enhance the accuracy and adaptability of the experiment, an adaptive adjustment mechanism is introduced, and model parameters Z1, Z2, Z3, Z4, U1, U2, U3 and U4 are adjusted according to real-time feedback so as to achieve a better threshold adjustment effect;

Analyzing the collected data by adopting an advanced statistical method to identify the optimal combination of model parameters under different network states, so as to further improve the universality and accuracy of the model;

Experimental data Excel is tabulated below:

Test object name	Rho value	Q value	E r value	E t value	Initial value of Deltar	Initial value of Deltat d	Δr adjusted value	Post-adjustment value of Deltat d
									Rate fluctuation threshold adjustment 1	0.98	0.5	100	-	10	-	15	-
Rate fluctuation threshold adjustment 2	-0.97	0.5	100	-	10	-	5	-
									Rate fluctuation threshold adjustment 3	0.05	0.5	100	-	10	-	12	-
Time delay threshold adjustment 1	0.99	0.4	-	200	-	20	-	30
									Time delay threshold adjustment 2	-0.01	0.4	-	200	-	20	-	22
Time delay threshold adjustment 3	0.02	0.4	-	200	-	20	-	21

The data were analyzed as follows:

the experiment obtains a series of data by adjusting the speed fluctuation threshold and the time delay threshold under different environments, analyzes the data, and can clearly see the beneficial effects of the invention content and the creative and novel effects embodied in the embodiment;

For strongly correlated environments, the ρ value is close to ±1: in the speed fluctuation threshold adjustment, when the rho value is 0.98, the adjusted threshold is increased from the initial 10 to 15, so that the model can automatically increase the threshold according to the strong correlation between the environment and the physical index, adapt to the environment change and reduce the possibility of false alarm; similarly, in the time delay threshold adjustment, when the ρ value is 0.99, the adjusted threshold is increased from 20 to 30, which shows the enhancement of the sensitivity of the model to the prediction of network delay, and enhances the adaptability of the system to network fluctuation;

For low correlation environments, the ρ value approaches 0: in the rate fluctuation threshold adjustment, the threshold is fine-tuned from 10 to 12 when the ρ value is 0.05, and from 20 to 22 when the ρ value is-0.01 and from 20 to 21 when the ρ value is 0.02 in the time delay threshold adjustment; the method shows that under the condition of almost no correlation, the threshold value is adjusted more finely, so that the sensitive reaction can be ensured in the environment with little change, and the resource waste caused by excessive adjustment is reduced;

Environmental suitability: by observing the ρ value, which represents the correlation of the environmental factor with the rate fluctuation or the time delay, the influence on the threshold adjustment can be seen that when the environmental factor is highly positively correlated with the rate fluctuation or the time delay, the ρ value is close to 1 or highly negatively correlated, and the ρ value is close to-1, the threshold adjustment is remarkable, and the threshold adjustment is changed from 10 to 15 or 5; this shows that the invention can flexibly adjust the threshold value according to the change of the environment, and increase the adaptability of the system;

Reducing false alarms and avoiding overregulation: when the rho value is close to 0, namely the correlation between the environmental factors and the rate fluctuation or the time delay is low, the adjustment amplitude is relatively small, and the adjustment is carried out from 10 to 12 or from 20 to 21 or 22; the fine adjustment strategy is helpful for reducing false alarms and avoiding resource waste caused by excessive adjustment;

Intelligence and efficiency: by combining the rho value, the Q value and the Er or Et value, the invention intelligently adjusts the Deltar or Deltatd value; the method not only reflects the quick response capability to environmental changes, but also improves the overall efficiency and reliability of the system;

The traditional system adopts a static or simple adjustment method based on experience on threshold adjustment, and the invention intelligently adjusts according to real-time data and complex environmental factors through a dynamic adjustment algorithm, thereby exhibiting obvious creativity and novelty.

Example eight

A method of improving the reliability of an optical storage system, said method for performing said optical storage system, comprising the steps of:

S1, collecting time shift measurement data of an optical disc and a laser head at the relative positions of the optical disc and the laser head caused by vibration or vibration, collecting a quantifiable parameter related to the time shift measurement data, and an error data set formed by focusing error, radial error and tracking error data, and collecting a preset threshold value of a disc system when writing operation is interrupted, wherein the preset threshold value is used for comparing with a time shift measurement value, collecting environmental factor data around the process of reading and writing data by the disc and the laser head, and collecting physical characteristic data related to the optical storage medium and the environmental factor data;

S2, analyzing and processing after obtaining the quantifiable parameters to generate a displacement evaluation index, wherein the displacement evaluation index is used for judging the displacement degree;

acquiring an error data set for analysis processing to generate an error evaluation index, wherein the error evaluation index is used for judging the error degree of the laser head;

The method comprises the steps of obtaining environmental factor data and material characteristic data, analyzing and processing the environmental factor data and the material characteristic data, and respectively generating an environmental impact index and a physical impact index; performing correlation analysis on the environment influence index and the physical influence index to generate an influence coefficient rho, wherein the influence coefficient rho is used for dividing the correlation degree between the environment influence index and the physical influence index;

And S3, analyzing and processing the displacement evaluation index, the error evaluation index and the influence coefficient rho after obtaining the displacement evaluation index, the error evaluation index and the influence coefficient rho, and constructing a threshold fine tuning model which is used for fine tuning a preset threshold.

The above formulas are all formulas with dimensions removed and numerical values calculated, the formulas are formulas with a large amount of data collected for software simulation to obtain the latest real situation, and preset parameters in the formulas are set by those skilled in the art according to the actual situation.

The specific values of delta, epsilon, ϵ, sigma and the like in the formula are generally determined by a person skilled in the art according to actual conditions, the formula is essentially weighted summation for comprehensive analysis, and the person skilled in the art collects a plurality of groups of sample data and sets a corresponding preset proportionality coefficient for each group of sample data; substituting the preset proportionality coefficient and the collected sample data into a formula, forming a quaternary once equation set by any four formulas, screening the calculated coefficient and taking an average value to obtain values of delta, epsilon, ϵ, sigma and the like;

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. Those of skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic mail, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application.

Claims (7)

1. An optical storage system comprising a process for performing a time shift measurement, which process is performed when writing data to an optical storage medium and involves an operation between two information streams, characterized in that it comprises in particular:

And a data acquisition module: the system comprises a data acquisition module, a data acquisition module and a data acquisition module, wherein the data acquisition module is used for acquiring time shift measurement data of an optical disc and a laser head at relative positions of the optical disc and the laser head caused by vibration or vibration, acquiring quantifiable parameters related to the time shift measurement data, and an error data set formed by focusing error, radial error and tracking error data, and acquiring a preset threshold value of a disc system when writing operation is interrupted, wherein the preset threshold value is used for comparing with the time shift measurement value, acquiring environmental factor data surrounding the process of reading and writing data by the disc and the laser head, and acquiring physical characteristic data related to the environmental factor data of an optical storage medium;

An index generation module: is used for analyzing and processing after obtaining the quantifiable parameters to generate a displacement evaluation index, the displacement evaluation index is used for judging the displacement degree;

acquiring an error data set for analysis processing to generate an error evaluation index, wherein the error evaluation index is used for judging the error degree of the laser head;

The method comprises the steps of obtaining environmental factor data and material characteristic data, analyzing and processing the environmental factor data and the material characteristic data, and respectively generating an environmental impact index and a physical impact index; performing correlation analysis on the environment influence index and the physical influence index to generate an influence coefficient rho, wherein the influence coefficient rho is used for dividing the correlation degree between the environment influence index and the physical influence index;

model construction module: the method is used for analyzing and processing after acquiring the displacement evaluation index, the error evaluation index and the influence coefficient rho, constructing a threshold fine tuning model and carrying out fine tuning on a preset threshold by the threshold fine tuning model.

2. An optical storage system according to claim 1, wherein: the time shift measurement data is detected by an optical pickup unit in the optical disc system, the quantifiable parameters comprise a vibration frequency parameter, a vibration amplitude parameter, a time stamp difference value, a relative speed variation and a track deviation degree, and the vibration frequency parameter, the vibration amplitude parameter, the time stamp difference value, the relative speed variation and the track deviation degree are calibrated in sequence to form a vibration frequency parameter f, a vibration amplitude parameter A and the time stamp difference valueAmount of change in relative speedAnd a track deviation D;

When the result of the time shift measurement exceeds a predetermined level, i.e., exceeds a predetermined threshold, the system interrupts the write operation to prevent a write operation defect due to an irregularity;

The predetermined levels are a rate fluctuation threshold and a time delay in turn, and the rate fluctuation threshold and the time delay are respectively calibrated as And；

The error data set composed of the focusing error, the radial error and the tracking error data specifically comprises the following contents;

The focus error is the distance deviation between the focal point of the light beam and the surface of the optical disc; setting F to the focus position and S to the surface position of the optical disk, the focus error Expressed as:

；

the radial error is the offset distance between the beam center and the track center of the optical disc, and if C represents the beam center position and T represents the track center position, then the radial error Expressed as:

；

tracking error is the deviation of the light beam when tracking the data track on the optical disc; setting up Representing the deviation between the beam track and the data track, tracking errorExpressed as:

；

the environmental factor data comprises a temperature parameter and a humidity parameter, and the temperature parameter and the humidity parameter are respectively calibrated into Wd and Sd; the optical storage medium physical property data includes a thermal expansion coefficient and a humidity expansion coefficient, and the thermal expansion coefficient and the humidity expansion coefficient are calibrated to RPz and SPz respectively.

3. An optical storage system according to claim 2, characterized in that: the method comprises the steps of obtaining quantifiable parameters, then analyzing and processing to generate a displacement evaluation index, wherein the displacement evaluation index is used for judging the displacement degree and specifically comprises the following steps of;

calibrating the displacement evaluation index as E, and setting a calculation formula of the displacement evaluation index E as follows:

；

Wherein f is a vibration frequency parameter, A is a vibration amplitude parameter, As the value of the difference in the time stamps,The relative velocity variation, D is the track deviation,

Parameters (parameters)Is a positive weight coefficient estimated from experimental data or experience,; The method is used for adjusting the influence degree of each parameter on the displacement evaluation index; parameters (parameters)Controlling the sensitivity of D to E;

setting the value range of E in Setting the practical upper limit threshold of E as；

When the E value is closer to 0, the influence of vibration or displacement on the system is smaller, and the system is stable; when E is closer toIt is shown that the vibration or displacement has a large influence on the system and it is necessary to reduce the vibration by adjusting the system.

4. An optical storage system according to claim 2, characterized in that: the obtained error data set is analyzed and processed to generate an error evaluation index, and the error evaluation index is used for judging the error degree of the laser head and specifically comprises the following contents;

the error evaluation index is defined as Q, and the calculation formula for setting the error evaluation index Q is as follows:

；

Wherein, Representing focus error; Representing radial error; Representing tracking errors; a1, a2, a3 and a4 are adjustment coefficients for adjusting the contribution of the respective error terms; nf, nr, nt are normalization factors ensuring that the output of the exponential function is within a defined range.

5. An optical storage system according to claim 2, characterized in that: the obtained environmental factor data and material characteristic data are analyzed and processed to respectively generate an environmental impact index and a physical impact index, which specifically comprise the following contents;

Defining environmental impact index as The calculation formula is as follows:

；

Wherein Wd is a temperature parameter of the current environment, and W0 is a calibrated temperature reference value;

sd is the humidity parameter of the current environment, S0 is the calibrated humidity reference value;

k1 and k2 are adjustment coefficients, and are optimally determined according to experimental data; e is the base of natural logarithms;

wherein the adjustment coefficients k1 and k2 are used for adjusting the influence weights of temperature and humidity;

Defining the physical impact index as The calculation formula is as follows;

；

RPz and SPz represent the current thermal expansion coefficient and the humidity expansion coefficient, respectively;

RP0 and SP0 are respective calibration reference values;

Setting up The value range is represented as,Distinguishing the performance grade of the optical storage medium under different environments and physical conditions through the value of the value range;

Defining the standard of the performance level and dividing the range:

Low performance representation ; Medium performance representation [ ]) ; High performance representation [ ])；

Wherein I representsAny one of them;

The generation influence coefficient ρ specifically includes the following contents:

Cosine similarity is used as a measure of two indices The method for calculating the similarity comprises the following steps:

；

wherein H is the number of samples; And The environmental impact index and the physical impact index of the h sample respectively; And Respectively isAndIs a sample mean value of (2);

defining the value range of rho as [ -1,1]; when ρ is close to 1, it indicates that AndHas strong positive correlation, namely, when the environmental and physical conditions change, they change in the same direction; when ρ approaches-1, it shows a strong negative correlation of both, i.e., one exponentially increases while the other decreases; when ρ approaches 0, it shows little correlation between the two.

6. An optical storage system according to claim 3 or 4 or 5, characterized in that: the displacement evaluation index, the error evaluation index and the influence coefficient rho are obtained and then are analyzed and processed, a threshold fine adjustment model is constructed, and the threshold fine adjustment model is used for fine adjustment of a preset threshold and specifically comprises the following contents;

introducing said predetermined threshold comprises a rate fluctuation threshold And time delay; Respectively constructing corresponding threshold fine tuning models, wherein the content is as follows;

Setting the rate fluctuation threshold adjustment model as ：

；

The time delay adjustment model is as follows：

；

Wherein,AndThe raw thresholds of rate fluctuation and time delay, respectively;

And The displacement amount evaluation index for the rate fluctuation and the time delay respectively,AndAll obtained by the following function;

；

q is an error evaluation index for rate fluctuation and time delay, respectively;

z1, Z2, Z3, Z4 and U1, U2, U3, U4 are model parameters between 0 and 1;

When ρ is close to 1 or-1, it indicates that there is a strong correlation between the environment and the physical index; setting the upper limit of the threshold values of E and Q as E1, and adjusting the original threshold value by a rate fluctuation threshold value adjusting model when the value of E or Q is larger than E1;

When ρ is close to 0, it shows little correlation between the two indices; at this time, the adjustment of the threshold value mainly depends on the values of E and Q;

The rate fluctuation threshold adjustment strategy is as follows:

defining a p near the critical value of 1 or-1 as 0.95 when Or (b)And, when expressed as a proximity state:

Setting up The upper adjustment limit of (2) is 150% of the original threshold value, and the lower limit is 50%; the mathematical expression is:

；

when rho is close to 0, setting rho close interval as rho epsilon (-0.1,0.1), collecting m1 time points in the past The mean value and the standard deviation are adjusted, if the standard deviation exceeds 30% of the mean value, the sensitivity of threshold adjustment is improved, and the mathematical expression is as follows:

Wherein, Representation ofMean of (2) representing past m1 time pointsAverage level of values; Representation of Represents the standard deviation of past m1 time pointsThe degree of change of the value, Z4 is an adjustment coefficient, and Z4 is 0 or 1, specifically;

When (when) Standard deviation of (2)Exceeding its average valueAt 30%, i.eThe value of the adjustment coefficient Z4 is 1;

Otherwise, i.e. when When the standard deviation of the (B) is not more than 30% of the average value, the value of the adjustment coefficient Z4 is 0;

The time delay threshold adjustment strategy is that when ρ approaches ±1 when there is a strong correlation:

A dynamic factor based on p is added, U4 times; the mathematical expression is:；

when ρ approaches 0, a measurement based on the last m2 measurements is introduced An adjustment coefficient of the rate of change;

if the change rate exceeds 20%, increasing the flexibility of threshold adjustment; the mathematical expression is as follows:

Wherein, Representation ofIs a rate of change of (2); representing the last m2 measurementsThe degree of change in the value;

0.20 represents a 20% change rate and is set as a reference value if If the rate of change of (2) exceeds 20%, a threshold adjustment is required.

7. A method of improving reliability of an optical storage system, comprising: the method for performing the optical storage system of any one of claims 1-6, the specific steps comprising:

S1, collecting time shift measurement data of an optical disc and a laser head at the relative positions of the optical disc and the laser head caused by vibration or vibration, collecting a quantifiable parameter related to the time shift measurement data, and an error data set formed by focusing error, radial error and tracking error data, and collecting a preset threshold value of a disc system when writing operation is interrupted, wherein the preset threshold value is used for comparing with a time shift measurement value, collecting environmental factor data around the process of reading and writing data by the disc and the laser head, and collecting physical characteristic data related to the optical storage medium and the environmental factor data;

S2, analyzing and processing after obtaining the quantifiable parameters to generate a displacement evaluation index, wherein the displacement evaluation index is used for judging the displacement degree;

acquiring an error data set for analysis processing to generate an error evaluation index, wherein the error evaluation index is used for judging the error degree of the laser head;

The method comprises the steps of obtaining environmental factor data and material characteristic data, analyzing and processing the environmental factor data and the material characteristic data, and respectively generating an environmental impact index and a physical impact index; performing correlation analysis on the environment influence index and the physical influence index to generate an influence coefficient rho, wherein the influence coefficient rho is used for dividing the correlation degree between the environment influence index and the physical influence index;

And S3, analyzing and processing the displacement evaluation index, the error evaluation index and the influence coefficient rho after obtaining the displacement evaluation index, the error evaluation index and the influence coefficient rho, and constructing a threshold fine tuning model which is used for fine tuning a preset threshold.