Method and device for chirp nonlinear calibration of optical signals, medium and equipment

Abstract

This disclosure provides a method, apparatus, computer-readable storage medium, and electronic device for linear frequency modulation (LFM) nonlinear calibration of optical signals, relating to the field of signal processing technology. The method includes: acquiring the modulation voltage signal V of the input light source during the i-th frequency modulation cycle. i (t) and the actual frequency signal f of the light signal output by the light source. i The relationship between (t) yields the actual correlation f corresponding to the i-th frequency modulation period. i (V), where i is a positive integer; based on the target frequency modulation signal f g (t) and actual correlation f i (V), determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t), j takes the value of i+1; modulate the voltage signal V j (t) Input a light source to achieve frequency modulation of the optical signal in the j-th frequency modulation cycle. This technical solution has low computational complexity and high timeliness, and can improve the efficiency of linear frequency modulation nonlinear calibration of optical signals.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of signal processing, in particular to a method and device for calibrating the nonlinearity of linear frequency modulation of an optical signal, a computer readable storage medium and an electronic device. BACKGROUND

[0002] A laser radar detects the position and other characteristic quantities of a target by emitting a laser beam. Specifically, the laser radar linearly frequency-modulates a continuous wave optical signal, and divides the light source output into a local light and a transmitted light. The transmitted light propagates in space to the target surface and is reflected, and part of the reflected light is received by the laser radar as a return light. The return light and the local light are mixed and coherently received. Since the return light and the local light have different frequencies, the frequency of the difference frequency signal obtained by mixing is the frequency difference between the two. Since it is linear frequency modulation, the frequency difference between the two is proportional to the round-trip propagation time of the transmitted / return light, so by measuring the frequency of the difference frequency signal, the physical quantity information about the target (such as the azimuth, height, etc. of the target relative to the laser radar) can be calculated.

[0003] The linear frequency modulation scheme provided by the related technology for the continuous wave optical signal has the problem of low efficiency of nonlinearity calibration of linear frequency modulation.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present disclosure is to provide a method and device for calibrating the nonlinearity of linear frequency modulation of an optical signal, a computer readable storage medium and an electronic device, which can improve the efficiency of nonlinearity calibration of linear frequency modulation of an optical signal to a certain extent.

[0006] Other characteristics and advantages of the present disclosure will become apparent from the following detailed description, or will be learned by practice of the present disclosure.

[0007] According to one aspect of the present disclosure, a method for calibrating the nonlinearity of linear frequency modulation of an optical signal is provided, the method comprising: in the i-th frequency modulation period, obtaining the relationship between the modulation voltage signal V i (t) of the input light source and the actual frequency signal f i (t) about the optical signal output by the light source, to obtain the actual correlation f i (V) corresponding to the i-th frequency modulation period, i being a positive integer; determining the modulation voltage signal V g (t) corresponding to the j-th frequency modulation period according to the target frequency modulation signal f i (t) and the actual correlation f j(t), j is i+1; and inputting the modulated voltage signal V j (t) to the light source to realize frequency modulation of the light signal in the jth frequency modulation period.

[0008] According to another aspect of the present disclosure, there is provided a device for calibrating linear frequency modulation of a light signal, comprising: an obtaining module, a determining module and a frequency modulation module.

[0009] The obtaining module is configured to obtain a modulated voltage signal V i (t) of the light source in the ith frequency modulation period. i (t) of the light source, and obtain an actual correlation f i (V) corresponding to the ith frequency modulation period. g (V) corresponding to the jth frequency modulation period. i (V) corresponding to the jth frequency modulation period. j (t), j is i+1; and the frequency modulation module is configured to input the modulated voltage signal V j (t) to the light source to realize frequency modulation of the light signal in the jth frequency modulation period.

[0010] According to still another aspect of the present disclosure, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for calibrating linear frequency modulation of a light signal according to any of the above embodiments when executing the computer program.

[0011] According to yet another aspect of the present disclosure, there is provided a computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for calibrating linear frequency modulation of a light signal according to any of the above embodiments.

[0012] The method for calibrating linear frequency modulation of a light signal, the device for calibrating linear frequency modulation of a light signal, the computer readable storage medium and the electronic device provided by the embodiments of the present disclosure have the following technical effects:

[0013] In the method for calibrating linear frequency modulation of a light signal, the correlation between the modulated voltage and the actual frequency in the previous frequency modulation period (for example, f i(V)) can be determined according to the above correlation. Further, the above correlation is applied to control of the modulation voltage input in the subsequent frequency modulation period. It can be seen that the technical solution provided in the embodiment can control the input voltage value in each frequency modulation period more accurately without a large number of iterations, thereby having the technical effects of small calculation amount and high timeliness, and improving the efficiency of linear frequency modulation nonlinear calibration of the optical signal.

[0014] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and serve to explain the principles of the disclosure. It is apparent that the accompanying drawings in the following description are only some embodiments of the disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0016] Figure 1 A schematic diagram showing the relationship between the frequency of the laser output by the semiconductor laser and the loaded voltage.

[0017] Figure 2 A schematic diagram showing the flow of the linear frequency modulation nonlinear calibration method for the optical signal in an exemplary embodiment of the disclosure.

[0018] Figure 3 A schematic diagram showing the flow of the linear frequency modulation nonlinear calibration method for the optical signal in another exemplary embodiment of the disclosure.

[0019] Figure 4 A comparison diagram showing the triangular wave voltage signal input to the laser and the frequency signal output by the laser in an exemplary embodiment of the disclosure.

[0020] Figure 5a A comparison diagram showing the actual correlation f i1 (V) in the first stage of the i-th frequency modulation period in an exemplary embodiment of the disclosure.

[0021] Figure 5b A comparison diagram showing the actual correlation f i2 (V) in the second stage of the i-th frequency modulation period in an exemplary embodiment of the disclosure.

[0022] Figure 6 A curve diagram showing the target frequency modulation signal f g (t) in an exemplary embodiment of the disclosure.

[0023] Figure 7aFig. 2 shows a schematic diagram of the actual relationship f i1 (V) a schematic diagram.

[0024] Figure 7b Fig. 3 shows a schematic diagram of the actual relationship f i2 (V) a schematic diagram.

[0025] Figure 8 Fig. 4 shows a schematic diagram of the modulated voltage signal V i+1 (t) of an exemplary embodiment of the present disclosure.

[0026] Figure 9 Fig. 5 shows a schematic diagram of the actual frequency signal f i+1 (t) of an exemplary embodiment of the present disclosure in comparison with the target frequency modulation signal f g (t).

[0027] Figure 10 Fig. 6 shows a schematic diagram of a structure of a linear frequency modulation nonlinear calibration device for optical signals, to which an embodiment of the present disclosure can be applied.

[0028] Figure 11 Fig. 7 shows a schematic diagram of a structure of a linear frequency modulation nonlinear calibration device for optical signals, according to another embodiment of the present disclosure.

[0029] Figure 12 Fig. 8 shows a schematic diagram of a structure of an electronic device suitable for implementing an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0031] The following description refers to the accompanying drawings, which show embodiments of the present disclosure. Wherever possible, the same reference numbers are used in the drawings and the following description refer to the drawings and illustrate embodiments of the present disclosure. Embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0033] Moreover, the drawings are not necessarily to scale. Like reference numerals can be used to denote like parts throughout the specification. Some of the blocks in the drawings can be functional blocks that represent functions implemented by a processor, software, or hardware, or a combination of the three. Some of the blocks in the drawings can be functional blocks that represent functions implemented by a processor, software, or hardware, or a combination of the three.

[0034] The following detailed description is presented in connection with the appended drawings. Figures are not necessarily drawn to scale and certain regions can have been omitted for clarity. Like reference numerals can be used to denote like parts throughout the description. Figures 1 to 8 The embodiments of the method for calibrating the chirp nonlinearity of an optical signal provided by the present disclosure are described in detail as follows:

[0035] The embodiments of the present disclosure are applicable to FMCW (Frequency Modulated Continuous Wave) lidar. The FMCW lidar can achieve high-accuracy detection of the distance and speed of a target by chirp modulation of a continuous wave optical signal. For example, the FMCW lidar can chirp modulate a continuous wave optical signal with a triangular wave and divide the output of the light source into a local light and a transmitted light. The transmitted light propagates through space to the surface of a target and is reflected. A portion of the reflected light is received by the lidar as a return light. The return light and the local light are mixed and coherently received. Because the return light and the local light have different frequencies, the frequency of the difference frequency signal obtained by mixing is the difference between the frequencies of the two. Because of the chirp modulation, the difference between the frequencies of the two is proportional to the round-trip propagation time of the transmitted / return light, so the physical quantity of the target can be calculated by measuring the frequency of the difference frequency signal. In addition, if the target has a radial velocity, the difference frequency signals obtained by up-sweeping and down-sweeping will be different, and the radial velocity of the target can be solved by calculating the difference between the two. As can be seen, the accuracy of the range and velocity measurement of the FMCW lidar depends on the triangular wave chirp modulation of the light source.

[0036] Exemplary, Figure 1 A schematic diagram showing the relationship between the frequency of the laser output by the semiconductor laser and the applied voltage.

[0037] For FMCW lidar with semiconductor laser as light source, the frequency of the output laser can be controlled by changing the size of the injected current or the applied voltage, so as to achieve the effect of linear frequency modulation of the light source. Referring to Figure 1 The frequency modulation of the light source can be achieved by inputting a triangular wave voltage V signal. However, the frequency signal f of the laser output by the semiconductor laser and the applied voltage V are not linearly related, and therefore the standard triangular wave voltage signal cannot achieve linear frequency modulation of the light signal.

[0038] When the frequency change of the continuous wave light signal of the FMCW lidar is no longer linear, the frequency of the difference frequency signal and the back-and-forth propagation time of the transmitted / received light in space are no longer proportional, and therefore the measurement result of the lidar will be biased. Therefore, in order to enable the FMCW lidar to accurately measure speed and distance, the input frequency modulation voltage signal needs to be controlled to calibrate the non-linearity of the frequency modulation of the light source and achieve linear frequency modulation of the light source.

[0039] Specifically, the embodiments of the present specification are applicable to the non-linearity calibration in the frequency modulation of the continuous wave light signal of the FMCW lidar.

[0040] In exemplary embodiments, Figure 2 A schematic diagram showing the flow of the method for linear frequency modulation non-linearity calibration of the light signal in an exemplary embodiment of the present disclosure. Referring to Figure 2 The method comprises:

[0041] S210, in the ith frequency modulation period, obtaining the relationship between the modulation voltage signal V i (t) input to the light source and the actual frequency signal f i (t) output by the light source about the light signal, to obtain the actual correlation f i (V) corresponding to the ith frequency modulation period, i being a positive integer;

[0042] S220, determining the modulation voltage signal V g (t) corresponding to the jth frequency modulation period according to the target frequency modulation signal f i (t) and the actual correlation f j (V), j taking the value of i+1; and

[0043] S230, inputting the modulation voltage signal V j (t) to the light source to achieve the frequency modulation of the light signal in the jth frequency modulation period.

[0044] In Figure 2 The technical solution provided by the embodiment shown above determines the correlation f i (V) between the modulation voltage and the actual frequency in the i-th frequency modulation period in advance, and according to the correlation, the modulation voltage required for a certain actual frequency can be determined. Further, the above correlation is applied to the control of the modulation voltage input in the j-th frequency modulation period. Specifically, the target frequency value determined at the target time point of the j-th period is determined, and then the modulation voltage required for the target frequency value is determined according to the correlation f i (V). Thus, the input voltage value in each frequency modulation period can be accurately controlled, thereby having the technical effects of small calculation amount and high timeliness, and the efficiency of linear frequency modulation nonlinear calibration of the optical signal can be improved.

[0045] It should be noted that, Figure 2 The method shown above is applicable to the state that the frequency value changes monotonously with time in each frequency modulation period, so that in the same frequency modulation period, the same frequency value corresponds to a modulation voltage value.

[0046] In this embodiment, since the embodiment of the present specification is applicable to linear frequency modulation of the continuous wave optical signal of the FMCW laser radar, the frequency modulation signal f Figure 2 In the embodiment above, the light source is a laser. In the following embodiments, the laser is also taken as the light source for illustration.

[0047] In the exemplary embodiment, Figure 3 shows a flowchart of a method for linear frequency modulation nonlinear calibration of an optical signal in another exemplary embodiment of the present disclosure, and the following will be described in detail in combination with Figure 3 the specific implementation of the embodiment shown above. Figure 2

[0048] Referring to Figure 3 , in S310, the target frequency modulation signal f g (t) is determined, and the initial modulation voltage signal V0(t) is determined. In S320, the initial modulation voltage signal V0(t) is determined as the modulation voltage signal V i (t) and is input into the laser, so as to obtain the actual frequency signal f i (t) output by the laser.

[0049] Exemplarily, the target frequency modulation signal f g ​(t) represents the output frequency of the laser under ideal conditions. The initial modulation voltage signal V0(t) mentioned above is the voltage signal input during the first frequency modulation cycle (i.e., i is 1). For example, the input voltage signal can be a standard triangular wave voltage signal. After inputting the initial modulation voltage signal V0(t) into the laser during the first frequency modulation cycle, the frequency signal of the light output by the laser machine can be obtained, i.e., the actual frequency signal f1(t).

[0050] In step S330, it is determined whether the number of iterations is greater than a preset number. In this embodiment, the user can set the maximum number of iterations to the preset number according to actual needs. If the number of iterations exceeds the preset number, the iteration calculation will stop; if the number of iterations is not greater than the preset number, the following iteration calculation process will be executed.

[0051] In S340, during the first stage of the i-th frequency modulation cycle, the modulation voltage signal V of the input laser is acquired. i1 (t) and the actual frequency signal f of the laser output optical signal i1 The relationship between (t) yields the actual correlation f. i1 (V). And, in S340', during the second stage of the i-th frequency modulation cycle, the modulation voltage signal V of the input laser is acquired. i2 (t) and the actual frequency signal f of the laser output optical signal i2 The relationship between (t) yields the actual correlation f. i2 (V).

[0052] For example, this embodiment uses Figure 4 Using the triangular wave as an example, each frequency modulation cycle includes a first stage where the frequency monotonically increases with time, and a second stage where the frequency monotonically decreases with time. Since a frequency modulation cycle consists of two stages where the frequency value changes monotonically with time, the relationship between the input modulation voltage signal and the output actual frequency signal is obtained for each stage, thus yielding the actual correlation f corresponding to the first stage of the i-th frequency modulation cycle. i1 The actual correlation between (V) and the first stage of the i-th frequency modulation cycle f i2 (V).

[0053] For example, refer to Figure 4 The first and second stages of the i-th frequency modulation cycle are divided into multiple time points. For the time point t of the first stage of the i-th frequency modulation cycle... m (m takes values ​​of 1, 2, ...), obtain time point t. m The corresponding modulation voltage value V i1 (t m ) and actual frequency value f i1 (tm ), further, according to V i1 (t m ) and f i1 (t m ) corresponding to each time point in the first stage, the actual correlation f i1 (V) is determined (as shown in Figure 5a ). For the time point t n (n takes value 1, 2, …) in the second stage of the i-th frequency modulation period, the modulation voltage value V n (t i2 ) and the actual frequency value f n (t i2 ) corresponding to the time point t n are obtained, further, according to V i2 (t n ) and f i2 (t n ) corresponding to each time point in the second stage, the actual correlation f i2 (V) is determined (as shown in Figure 5b ).

[0054] Continuing to refer to Figure 3 , in S350, the actual correlation f i1 (V) corresponding to the first stage of the i-th frequency modulation period, and the actual correlation f i2 (V) corresponding to the second stage of the i-th frequency modulation period, are determined as the actual correlation f i (V) corresponding to the i-th period.

[0055] Further, the modulation voltage values corresponding to each time point in the first stage of the i+1-th frequency modulation period are determined through S360 and S370, specifically:

[0056] In the embodiment, j takes value i+1, that is, for the modulation voltage signal in any frequency modulation period greater than 1, the actual correlation determined according to the previous frequency modulation period is determined.

[0057] In S360, the first target frequency values corresponding to the plurality of first time points in the first stage of the i+1-th frequency modulation period are determined according to the target frequency modulation signal f g (t); and in S370, the first actual modulation voltage corresponding to each first target frequency value is determined according to the actual correlation f i1 (V), to obtain the modulation voltage values corresponding to each time point in the first stage of the i+1-th frequency modulation period.

[0058] Exemplarily, Figure 6 The target frequency modulation signal f gA schematic diagram of the curve (t). For the first time point t in the first stage of the (i+1)th frequency modulation cycle. m ',according to Figure 6 The target frequency modulation signal f shown g (t) curve determines t m 'Corresponding first target frequency value f g (t m '). Further, refer to Figure 7a In the actual relationship f i1 The first target frequency value f is determined from the (V) curve. g (t m The first actual modulation voltage value V corresponding to ') i+1 (t m Thus, the first time point t in the first stage of the (i+1)th frequency modulation cycle is obtained. m The corresponding input voltage value. By analogy, the modulation voltage value corresponding to each time point in the first stage of the (i+1)th frequency modulation cycle can be determined.

[0059] Continue to refer to Figure 3 The modulation voltage values ​​corresponding to each time point in the second stage of the (i+1)th frequency modulation cycle are determined by S360' and S370', specifically:

[0060] In S360', based on the target frequency modulation signal f g (t), determine the second target frequency values ​​corresponding to multiple second time points in the second stage of the (i+1)th frequency modulation cycle; and, in S370', according to the actual correlation f i2 (V), determine the second actual modulation voltage corresponding to each second target frequency value, and obtain the modulation voltage value corresponding to each time point in the second stage of the i+1th frequency modulation cycle.

[0061] Similar to the embodiment that determines the modulation voltage value corresponding to each time point in the second stage of the i+1 frequency modulation cycle: for example, for the second time point t in the second stage of the i+1 frequency modulation cycle n ',according to Figure 6 The target frequency modulation signal f shown g (t) curve determines t n 'Corresponding second target frequency value f g (t n '). Further, refer to Figure 7b In the actual relationship f i2 The second target frequency value f is determined from the (V) curve. g (t n The second actual modulation voltage value V corresponding to ') i+1 (t n). Thus, the second time point t n corresponding input voltage value. In this way, the modulation voltage value corresponding to each time point in the second stage of the i+1 frequency modulation period can be determined.

[0062] In an exemplary embodiment, with reference to Figure 8 the modulation voltage signal V i+1 (t) corresponding to the i+1 frequency modulation period is shown.

[0063] With reference to Figure 3 , after the modulation voltage signal V i+1 (t) corresponding to the i+1 frequency modulation period is determined, S380 is performed: the actual frequency signal f i+1 (t) corresponding to the i+1 frequency modulation period is obtained, and the i+1 frequency modulation period is divided into multiple time points.

[0064] Exemplarily, after the modulation voltage signal V i+1 (t) is input into the laser in the i+1 frequency modulation period, the output of the laser can be represented as f i+1 (t). Exemplarily, Figure 9 the actual frequency signal f i+1 (t) corresponding to the i+1 frequency modulation period is shown. Further, the i+1 frequency modulation period is divided into S time points, with reference to Figure 9 the time point t k , k takes values of 1, 2, … S. S takes values of positive integers, and the specific value of S can be determined according to actual needs.

[0065] In S390, for the time point t k , the matching degree p k of the actual frequency value f i+1 (t k ) corresponding to the time point t k in the i+1 frequency modulation period and the target frequency modulation value f g (t k ) corresponding to the time point t k is calculated. And in S3100, it is judged whether the matching degree satisfies a preset condition.

[0066] In an exemplary embodiment, with reference to Figure 9 , the matching degree p k corresponding to the time point t k may be determined by calculating the ratio of the actual frequency value f i+1 (t k ) and the target frequency modulation value f g (t k ).. Specifically, the matching degrees corresponding to the S time points can be obtained: p1, p2, … p k ,…p S . Further, the absolute values of the differences between the S matching degrees and 1 are respectively calculated. In the embodiment, in the case where the S obtained absolute values are all less than a first preset value, it is indicated that the current modulation voltage signal has met the preset requirement, and then the iteration can be ended, and the modulation voltage signal V i+1 (t) corresponding to the i+1 frequency modulation period is taken as the voltage signal input to the laser. Figure 3 In the case where there is an absolute value (the absolute value of the difference between the matching degree and 1) not less than the first preset value, it is indicated that the current modulation voltage signal has not met the preset requirement, i+1 is assigned to i, and the S330 is continuously executed to continue the iteration process.

[0067] In another exemplary embodiment, the absolute value of the difference between the actual frequency value f i+1 (t k ) and the target frequency modulation value f g (t k ) is determined as the matching degree p k corresponding to the time point t k . Specifically, the S matching degrees corresponding to the S time points can be obtained: p’1, p’2, … p’ k ,…p’ S . In the embodiment, in the case where the S matching degrees are all less than a second preset value, it is indicated that the current modulation voltage signal has met the preset requirement, and then the iteration can be ended, and the modulation voltage signal V i+1 (t) corresponding to the i+1 frequency modulation period is taken as the voltage signal input to the laser. Figure 3 In the case where there is an absolute value (the absolute value of the difference between the matching degree and 1) not less than the first preset value, it is indicated that the current modulation voltage signal has not met the preset requirement, i+1 is assigned to i, and the S330 is continuously executed to continue the iteration process.

[0068] It can be seen that, in the linear frequency modulation scheme for the optical signal provided by the embodiments of the present disclosure, the correlation relationship f i (V) between the modulation voltage and the actual frequency is determined in the i frequency modulation period, and according to the correlation relationship, the modulation voltage required to be input for a certain actual frequency can be determined. Further, the correlation relationship is applied to the control of the modulation voltage input in the j frequency modulation period. Specifically, the target frequency value determined at the target time point of the j period is determined, and then the correlation relationship f i(V) determining the modulation voltage required for inputting the target frequency value. Thus, the input voltage value in each frequency modulation period can be more accurately controlled, thereby having technical effects of small calculation amount and high timeliness, and the efficiency of linear frequency modulation and nonlinear calibration of the optical signal can be improved.

[0069] In the related art, the initial voltage step and the voltage value reduced on the basis of the initial voltage step are required to implement the process of linear frequency modulation of the light source. Specifically:

[0070] After the initial modulation voltage signal V0(t) is input to the laser, the frequency signal output by the laser is obtained. Further, the frequency modulation period is divided into multiple time points, and the value of the actual frequency modulation curve and the value of the ideal frequency modulation target curve are compared at each time point:

[0071] (a) if F i (t s ) and F g (t s ) are different within the allowed frequency deviation range and F i (t s ) > F g (t s ), then the frequency modulation voltage at this moment is too large, and needs to be reduced by a step: V i+1 (t s ) = V i (t s )-ΔV i ;

[0072] (b) if F i (t s ) and F g (t s ) are different within the allowed frequency deviation range and F i (t s ) < F g (t s ), then the frequency modulation voltage at this moment is too small, and needs to be increased by a step: V i+1 (t s ) = V i (t s )+ΔV i ;

[0073] Thus, a new frequency modulation voltage signal V i+1 (t) can be obtained, and the voltage step is reduced to ΔV i+1 .

[0074] It can be seen that the scheme provided by the related art has the following problems: in the case that the initial voltage step is too large and / or the voltage step is reduced too slowly, the actual frequency modulation curve cannot be accurately determined, or the actual frequency modulation curve cannot be close to the allowed frequency deviation range of the target frequency modulation curve; on the contrary, in the case that the initial voltage step is too small and / or the voltage step is reduced too quickly, the number of iterations of the algorithm is large, the calculation amount is large, and the timeliness is poor. Meanwhile, the related art also has the problems of poor stability and low reliability.

[0075] Compared with the related art, the scheme provided by the embodiments of the present specification does not depend on the selected initial voltage step and the way of reducing the voltage step, and a relatively ideal actual frequency modulation signal can be obtained in the case that the number of iterations is small, that is, the error between the actual frequency modulation signal and the target frequency modulation signal is within the preset range. Meanwhile, the calculation amount is small, the timeliness is high, and the stability is poor and the reliability is high.

[0076] It should be noted that the above figures are only schematic illustrations of the processes included in the method according to the example embodiments of the present application, and are not for the purpose of limitation. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of the processes. In addition, it is also easy to understand that these processes can be executed synchronously or asynchronously, for example, in multiple modules.

[0077] The following is an apparatus embodiment of the present disclosure, which can be used to execute the method embodiments of the present disclosure. For details not disclosed in the apparatus embodiments of the present disclosure, please refer to the method embodiments of the present disclosure.

[0078] wherein, Figure 10 A structural schematic diagram of a light signal linear frequency modulation nonlinear calibration device to which an embodiment of the present disclosure can be applied is shown. Please refer to Figure 10 The light signal linear frequency modulation nonlinear calibration device shown in the figure can be realized by software, hardware or a combination of the two to become all or part of an electronic device, and can also be integrated as an independent module in an electronic device or on a server.

[0079] The light signal linear frequency modulation nonlinear calibration device 1000 in the embodiment of the present disclosure includes an acquisition module 1010, a determination module 1020, and a frequency modulation module 1030.

[0080] The acquisition module 1010 is configured to acquire, in the i-th frequency modulation period, a modulation voltage signal V i (t) of an input light source and a relationship between the actual frequency signal f i (t) of the light signal output by the light source, to obtain an actual correlation relationship f i (V) corresponding to the i-th frequency modulation period, i being a positive integer; the determination module 1020 is configured to determine, according to a target frequency modulation signal f g(t) and the actual correlation relationship f i (V) corresponding to the jth frequency modulation period, and determine the modulation voltage signal V j (t) corresponding to the jth frequency modulation period, and j takes the value of i+1; and the frequency modulation module 1030 is configured to input the modulation voltage signal V j (t) into the light source to realize frequency modulation of the light signal in the jth frequency modulation period.

[0081] In an exemplary embodiment, Figure 11 An exemplary structural diagram of a linear frequency modulation nonlinear calibration device for a light signal according to another exemplary embodiment of the present disclosure is shown schematically. Please refer to Figure 11

[0082] In an exemplary embodiment, based on the foregoing scheme, the acquisition module 1010 is specifically configured to: divide the ith frequency modulation period into a plurality of time points; and acquire a modulation voltage value and an actual frequency value corresponding to each time point in the plurality of time points to obtain the actual correlation relationship f i (V).

[0083] In an exemplary embodiment, based on the foregoing scheme, the determination module 1020 is specifically configured to: divide the jth frequency modulation period into a plurality of time points; determine a target frequency value corresponding to each time point in the plurality of time points in the jth frequency modulation period according to the target frequency modulation signal f g (t); determine an actual modulation voltage value corresponding to each target frequency value according to the actual correlation relationship f i (V); obtain actual modulation voltage values corresponding to the plurality of time points in the jth frequency modulation period; and determine a modulation voltage signal V j (t) corresponding to the jth frequency modulation period according to the actual modulation voltage values corresponding to the plurality of time points in the jth frequency modulation period.

[0084] In an exemplary embodiment, based on the foregoing scheme, the frequency value monotonically changes with time within the ith frequency modulation period; and the frequency value monotonically changes with time within the jth frequency modulation period.

[0085] In an exemplary embodiment, based on the foregoing scheme, the ith frequency modulation period includes: a first stage in which the frequency monotonically increases with time, and a second stage in which the frequency monotonically decreases with time.

[0086] The acquisition module 1010 is specifically configured to: in the first stage of the ith frequency modulation period, acquire a relationship between a modulation voltage signal V i1 (t) input into the light source and an actual frequency signal f i1 (t) output by the light source about the light signal, to obtain the actual correlation relationship f i1 ​(V), and, in the second stage of the i-th frequency modulation period, obtaining a modulation voltage signal V i2 (t) output by the light source i2 (t) output by the light source i2 (V); the actual correlation relationship f i1 (V) in the second stage of the i-th frequency modulation period, and the actual correlation relationship f i2 (V) in the second stage of the i-th frequency modulation period, and the actual correlation relationship f i (V) in the second stage of the i-th frequency modulation period, and the actual correlation relationship f

[0087] In an exemplary embodiment, based on the foregoing scheme, the determination module 1020 is specifically configured to: divide the first stage of the j-th frequency modulation period into a plurality of first time points; determine a first target frequency value corresponding to each of the plurality of first time points according to the target frequency modulation signal f g (t); determine a first actual modulation voltage value corresponding to each of the first target frequency values according to the actual correlation relationship f i1 (V), to obtain actual modulation voltage values corresponding to the plurality of first time points; determine a modulation voltage signal V j (t) corresponding to the first stage of the j-th frequency modulation period according to the actual modulation voltage values corresponding to the plurality of first time points; and

[0088] divide the second stage of the j-th frequency modulation period into a plurality of second time points; determine a second target frequency value corresponding to each of the plurality of second time points according to the target frequency modulation signal f g (t);

[0089] determine a second actual modulation voltage value corresponding to each of the second target frequency values according to the actual correlation relationship f i2 (V), to obtain actual modulation voltage values corresponding to the plurality of second time points; determine a modulation voltage signal V j2 (t) corresponding to the second stage of the j-th frequency modulation period according to the actual modulation voltage values corresponding to the plurality of second time points; and

[0090] determine a modulation voltage signal V j1 (t) corresponding to the first stage of the j-th frequency modulation period, and a modulation voltage signal V j2 (t) corresponding to the second stage of the j-th frequency modulation period, to determine a modulation voltage signal V j (t) corresponding to the j-th frequency modulation period.

[0091] In an exemplary embodiment, based on the foregoing scheme, the above-mentioned device further includes a computing module 1040.

[0092] The calculation module 1040 is used to: determine the modulation voltage signal V corresponding to the j-th frequency modulation period in the determination module 1020. j After (t), obtain the actual frequency signal f corresponding to the j-th frequency modulation period mentioned above. j (t), and divide the j-th frequency modulation period into multiple time points; for each time point, calculate the actual frequency signal f. j (t) and the target frequency modulation signal f mentioned above g The matching degree of (t); and, if the matching degree satisfies the preset condition, the modulation voltage signal V corresponding to the j-th frequency modulation period is determined. j (t) represents the target modulated voltage signal.

[0093] In an exemplary embodiment, based on the foregoing scheme, the above calculation of the actual frequency signal f j (t) and the target frequency modulation signal f mentioned above g The matching degree of (t) includes: calculating the actual frequency signal f mentioned above. j (t) and the target frequency modulation signal f mentioned above g The ratio of (t) is used to obtain the matching degree corresponding to each of the above time points; if the matching degree meets the preset conditions, the modulation voltage signal V corresponding to the j-th frequency modulation cycle is determined. j (t) represents the target modulation voltage signal, including: calculating the absolute value of the difference between the matching degree and 1 at each of the above time points; and determining the modulation voltage signal V corresponding to the j-th frequency modulation cycle when the absolute value at each of the above time points is less than a first preset value. j (t) represents the target modulation voltage signal;

[0094] or,

[0095] The above calculation of the actual frequency signal f j (t) and the target frequency modulation signal f mentioned above g The matching degree of (t) includes: calculating the actual frequency signal f mentioned above. j (t) and the target frequency modulation signal f mentioned above g The difference between (t) is used to obtain the matching degree corresponding to each of the above time points; under the condition that the matching degree meets the preset conditions, the modulation voltage signal V corresponding to the j-th frequency modulation cycle is determined. j (t) represents the target modulation voltage signal, including: determining the modulation voltage signal V corresponding to the j-th frequency modulation cycle when the matching degree at each of the above time points is less than the second preset value. j (t) represents the target modulated voltage signal.

[0096] It should be noted that the above embodiment provides the linear frequency modulation nonlinear calibration device for the optical signal, when performing the linear frequency modulation nonlinear calibration method for the optical signal, only the above-mentioned functional module is divided to illustrate, and in actual application, the above-mentioned function distribution can be completed by different functional modules according to the needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the linear frequency modulation nonlinear calibration device for the optical signal provided by the above embodiment and the linear frequency modulation nonlinear calibration method for the optical signal belong to the same concept, so for the details not disclosed in the device embodiment of the present disclosure, please refer to the above-mentioned linear frequency modulation nonlinear calibration method for the optical signal of the present disclosure, which will not be described here.

[0097] The above-mentioned serial number of the embodiment of the present disclosure is only for description, not representing the advantages and disadvantages of the embodiment.

[0098] The embodiment of the present disclosure also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the steps of the method of any one of the above-mentioned embodiments. Wherein, the computer readable storage medium can include but not limited to any type of disk, including floppy disk, optical disk, DVD, CD-ROM, micro drive and magneto-optical disk, ROM, RAM, EPROM, EEPROM, DRAM, VRAM, flash memory device, magnetic card or optical card, nanosystem (including molecular memory IC), or any type of medium or device suitable for storing instructions and / or data.

[0099] The embodiment of the present disclosure also provides an electronic device, which includes a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the program to realize the steps of the method of any one of the above-mentioned embodiments.

[0100] Figure 12 The structure diagram of the electronic device in an exemplary embodiment of the present disclosure is schematically shown. Please refer to Figure 12 As shown, the electronic device 1200 includes a processor 1201 and a memory 1202.

[0101] In the embodiments of the present disclosure, the processor 1201 is the control center of the computer system, which can be a processor of a physical machine or a processor of a virtual machine. The processor 1201 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 1201 can be implemented in at least one of the hardware forms of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 1201 can also include a main processor and a coprocessor. The main processor is a processor for processing data in an awake state, also known as a CPU (Central Processing Unit). The coprocessor is a low-power processor for processing data in a standby state.

[0102] In the embodiments of the present disclosure, the processor 1201 is specifically configured to:

[0103] In the i-th frequency modulation period, the relationship between the modulation voltage signal V i (t) of the input light source and the actual frequency signal f i (t) output by the light source about the light signal is obtained, to obtain the actual correlation relationship f i (V) corresponding to the i-th frequency modulation period, i is a positive integer; according to the target frequency modulation signal f g (t) and the actual correlation relationship f i (V), the modulation voltage signal V j (t) corresponding to the j-th frequency modulation period is determined, j takes the value of i+1; and the modulation voltage signal V j (t) is input into the light source to realize frequency modulation of the light signal in the j-th frequency modulation period.

[0104] Further, in the i-th frequency modulation period, the relationship between the modulation voltage signal V i (t) of the input light source and the actual frequency signal f i (t) output by the light source about the light signal is obtained, to obtain the actual correlation relationship f i (V) corresponding to the i-th frequency modulation period, including: dividing the i-th frequency modulation period into a plurality of time points; and obtaining the modulation voltage value and the actual frequency value corresponding to each time point in the plurality of time points, to obtain the actual correlation relationship f i (V).

[0105] Further, according to the target frequency modulation signal f g (t) and the actual correlation relationship fi (V), determining the modulation voltage signal V j (t), comprising: dividing the jth frequency modulation period into a plurality of time points; determining target frequency values corresponding to the plurality of time points in the jth frequency modulation period according to the target frequency modulation signal f g (t); determining actual modulation voltage values corresponding to each of the target frequency values according to the actual correlation relationship f i (V), obtaining actual modulation voltage values corresponding to the plurality of time points in the jth frequency modulation period; and determining the modulation voltage signal V j (t) corresponding to the jth frequency modulation period according to the actual modulation voltage values corresponding to the plurality of time points in the jth frequency modulation period.

[0106] Further, in the ith frequency modulation period, the frequency value monotonically changes with time; in the jth frequency modulation period, the frequency value monotonically changes with time.

[0107] Further, the ith frequency modulation period comprises: a first stage in which the frequency monotonically increases with time, and a second stage in which the frequency monotonically decreases with time.

[0108] The modulation voltage signal V i (t) input to the light source is obtained, and the relationship between the modulation voltage signal V i (t) input to the light source and the actual frequency signal f i (t) output by the light source about the optical signal is obtained, to obtain the actual correlation relationship f i1 (t) in the first stage of the ith frequency modulation period, the modulation voltage signal V i1 (t) input to the light source is obtained, and the relationship between the modulation voltage signal V i1 (t) input to the light source and the actual frequency signal f i2 (t) output by the light source about the optical signal is obtained, to obtain the actual correlation relationship f i2 (t) in the second stage of the ith frequency modulation period, the modulation voltage signal V i2 (t) input to the light source is obtained, and the relationship between the modulation voltage signal V i1 (t) input to the light source and the actual frequency signal f i2 (t) output by the light source about the optical signal is obtained, to obtain the actual correlation relationship f i (V) corresponding to the ith period.

[0109] Further, the actual correlation relationship f g (t) is obtained according to the target frequency modulation signal fi (V), determines the modulation voltage signal V j (t) corresponding to the jth frequency modulation period, comprises:

[0110] divides the first stage of the jth frequency modulation period into a plurality of first time points; according to the target frequency modulation signal f g (t), determines a first target frequency value corresponding to each of the plurality of first time points; according to the actual correlation f i1 (V), determines a first actual modulation voltage value corresponding to each of the first target frequency values, to obtain an actual modulation voltage value corresponding to each of the plurality of first time points; according to the actual modulation voltage value corresponding to each of the plurality of first time points, determines the modulation voltage signal V j (t) corresponding to the first stage of the jth frequency modulation period; and

[0111] divides the second stage of the jth frequency modulation period into a plurality of second time points; according to the target frequency modulation signal f g (t), determines a second target frequency value corresponding to each of the plurality of second time points; according to the actual correlation f i2 (V), determines a second actual modulation voltage value corresponding to each of the second target frequency values, to obtain an actual modulation voltage value corresponding to each of the plurality of second time points; according to the actual modulation voltage value corresponding to each of the plurality of second time points, determines the modulation voltage signal V j2 (t) corresponding to the second stage of the jth frequency modulation period; and

[0112] combines the modulation voltage signal V j1 (t) corresponding to the first stage of the jth frequency modulation period, and the modulation voltage signal V j2 (t) corresponding to the second stage of the jth frequency modulation period, to determine the modulation voltage signal V j (t) corresponding to the jth frequency modulation period.

[0113] Further, the processor 1201 is further specifically configured to: after determining the modulation voltage signal V j (t) corresponding to the jth frequency modulation period, acquire an actual frequency signal f j (t) corresponding to the jth frequency modulation period; and for each time point, calculate a matching degree between the actual frequency signal f j (t) and the target frequency modulation signal f g (t); and in a case where the matching degree satisfies a preset condition, determine that the modulation voltage signal V j (t) corresponding to the jth frequency modulation period is a target modulation voltage signal.

[0114] Further, the matching degree between the actual frequency signal f j (t) and the target frequency modulation signal f g (t) includes: calculating the ratio of the actual frequency signal f j (t) and the target frequency modulation signal f g (t) to obtain the matching degree corresponding to each time point; and determining that the modulation voltage signal V j (t) corresponding to the jth frequency modulation period is the target modulation voltage signal when the matching degree meets a preset condition, which includes: calculating the absolute value of the difference between the matching degree corresponding to each time point and 1; and determining that the modulation voltage signal V j (t) corresponding to the jth frequency modulation period is the target modulation voltage signal when the absolute value corresponding to each time point is less than a first preset value.

[0115] Or,

[0116] The matching degree between the actual frequency signal f j (t) and the target frequency modulation signal f g (t) includes: calculating the difference between the actual frequency signal f j (t) and the target frequency modulation signal f g (t) to obtain the matching degree corresponding to each time point; and determining that the modulation voltage signal V j (t) corresponding to the jth frequency modulation period is the target modulation voltage signal when the matching degree meets a preset condition, which includes: determining that the modulation voltage signal V j (t) corresponding to the jth frequency modulation period is the target modulation voltage signal when the matching degree corresponding to each time point is less than a second preset value.

[0117] The memory 1202 can include one or more computer-readable storage media. The computer-readable storage media can be non-transitory. The memory 1202 can also include high-speed random access memory and non-volatile memory, such as one or more magnetic disk storage devices, flash storage devices. In some embodiments of the present disclosure, the non-transitory computer-readable storage medium in the memory 1202 is used to store at least one instruction for being executed by the processor 1201 to implement the method in the embodiments of the present disclosure.

[0118] In some embodiments, the electronic device 1200 further includes a peripheral device interface 1203 and at least one peripheral device. The processor 1201, the memory 1202 and the peripheral device interface 1203 can be connected through a bus or a signal line. Each peripheral device can be connected to the peripheral device interface 1203 through a bus, a signal line or a circuit board. Specifically, the peripheral device includes at least one of a display screen 1204, a camera 1205 and an audio circuit 1206.

[0119] The peripheral device interface 1203 can be used to connect at least one peripheral device related to I / O (Input / Output) to the processor 1201 and the memory 1202. In some embodiments of the present disclosure, the processor 1201, the memory 1202 and the peripheral device interface 1203 are integrated on the same chip or circuit board; in some other embodiments of the present disclosure, any one or two of the processor 1201, the memory 1202 and the peripheral device interface 1203 can be implemented on a separate chip or circuit board. The embodiments of the present disclosure do not make specific limitations in this regard.

[0120] The display screen 1204 is used to display a UI (User Interface). The UI can include graphics, text, icons, video and any combination thereof. When the display screen 1204 is a touch display screen, the display screen 1204 also has the ability to collect touch signals on or above the surface of the display screen 1204. The touch signals can be input to the processor 1201 as control signals for processing. At this time, the display screen 1204 can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments of the present disclosure, the display screen 1204 can be one, arranged on the front panel of the electronic device 1200; in some other embodiments of the present disclosure, the display screen 1204 can be at least two, arranged on different surfaces of the electronic device 1200 or in a folding design; in some other embodiments of the present disclosure, the display screen 1204 can be a flexible display screen, arranged on a curved surface or a folding surface of the electronic device 1200. Even, the display screen 1204 can also be arranged in an irregular shape other than a rectangle, i.e. a special-shaped screen. The display screen 1204 can be made of materials such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode).

[0121] The camera 1205 is configured to capture images or videos. Optionally, the camera 1205 includes a front camera and a rear camera. Generally, the front camera is disposed on the front panel of the electronic device, and the rear camera is disposed on the back of the electronic device. In some embodiments, the rear camera is at least two, which is any one of a main camera, a depth-of-field camera, a wide-angle camera, and a telephoto camera, to realize the background blur function by fusing the main camera and the depth-of-field camera, the panorama and VR (Virtual Reality) shooting function by fusing the main camera and the wide-angle camera, or other fusion shooting functions. In some embodiments of the present disclosure, the camera 1205 can further include a flash. The flash can be a single-color-temperature flash or a dual-color-temperature flash. The dual-color-temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation at different color temperatures.

[0122] The audio circuit 1206 can include a microphone and a speaker. The microphone is configured to capture sound waves of a user and an environment, and convert the sound waves into an electrical signal input to the processor 1201 for processing. For the purpose of stereo sound capture or noise reduction, the microphone can be multiple, which are respectively disposed at different parts of the electronic device 1200. The microphone can also be an array microphone or an omnidirectional capture microphone.

[0123] The power supply 1207 is configured to supply power to various components in the electronic device 1200. The power supply 1207 can be an alternating current, a direct current, a disposable battery, or a rechargeable battery. When the power supply 1207 includes a rechargeable battery, the rechargeable battery can be a wired charging battery or a wireless charging battery. The wired charging battery is a battery that is charged through a wired line, and the wireless charging battery is a battery that is charged through a wireless coil. The rechargeable battery can also be used to support fast charging technology.

[0124] The structural block diagram of the electronic device shown in the embodiments of the present disclosure does not constitute a limitation on the electronic device 1200, which can include more or fewer components than shown, or combine certain components, or use different component arrangements.

[0125] In the description of the present disclosure, it should be understood that the terms “first”, “second”, and the like are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. In addition, in the description of the present disclosure, “a plurality of” means two or more, unless otherwise specified. “And / or”, which describes the association relationship of the associated objects, means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character “ / ” generally represents that the front and rear associated objects are in an “or” relationship.

[0126] The above merely provides the specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the equivalent changes made according to the claims of the present disclosure are still covered within the scope of the present disclosure.

Claims

1. A linear frequency modulation nonlinear calibration method for optical signals, characterized in that, The method includes: In the i-th frequency modulation cycle, acquire the modulation voltage signal V of the input light source. i (t) and the actual frequency signal f of the light signal output by the light source. i The relationship between (t) is used to obtain the actual correlation f corresponding to the i-th frequency modulation period. i (V), where i is a positive integer; According to the target frequency modulation signal f g (t) and the actual relationship f i (V), determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t), where j takes the value of i+1; The modulation voltage signal V j (t) Input the light source to achieve frequency modulation of the optical signal during the j-th frequency modulation cycle; Specifically, in the i-th frequency modulation cycle, the modulation voltage signal V of the input light source is acquired. i (t) and the actual frequency signal f of the light signal output by the light source. i The relationship between (t) is used to obtain the actual correlation f corresponding to the i-th frequency modulation period. i (V), including: The i-th frequency modulation period is divided into multiple time points; Obtain the modulation voltage value and actual frequency value corresponding to each of the multiple time points to obtain the actual correlation f. i (V); The target frequency modulation signal f g (t) and the actual relationship f i (V), determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t), including: The j-th frequency modulation period is divided into multiple time points; According to the target frequency modulation signal f g (t), determine the target frequency values ​​corresponding to the plurality of time points in the j-th frequency modulation cycle; Based on the actual relationship f i (V), determine the actual modulation voltage value corresponding to each of the target frequency values, and obtain the actual modulation voltage values ​​corresponding to the multiple time points in the j-th frequency modulation cycle; Based on the actual modulation voltage values ​​corresponding to the multiple time points in the j-th frequency modulation cycle, determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t).

2. The method according to claim 1, characterized in that, During the i-th frequency modulation period, the frequency value changes monotonically with time; during the j-th frequency modulation period, the frequency value changes monotonically with time.

3. The method according to claim 1, characterized in that, The i-th frequency modulation period includes: a first stage in which the frequency monotonically increases with time, and a second stage in which the frequency monotonically decreases with time; The modulation voltage signal V of the input light source is obtained. i (t) and the actual frequency signal f of the light signal output by the light source. i The relationship between (t) is used to obtain the actual correlation f corresponding to the i-th frequency modulation period. i (V), including: In the first stage of the i-th frequency modulation cycle, the modulation voltage signal V input to the light source is acquired. i1 (t) and the actual frequency signal f of the light signal output by the light source. i1 The relationship between (t) yields the actual correlation f. i1 (V), and, in the second stage of the i-th frequency modulation cycle, acquiring the modulation voltage signal V input to the light source. i2 (t) and the actual frequency signal f of the light signal output by the light source. i2 The relationship between (t) yields the actual correlation f. i2 (V); The actual correlation f corresponding to the first stage of the i-th frequency modulation cycle i1 (V), and the actual correlation f corresponding to the second stage of the i-th frequency modulation cycle. i2 (V), is determined to be the actual correlation f corresponding to the i-th period. i (V).

4. The method according to claim 3, characterized in that, The target frequency modulation signal f g (t) and the actual relationship f i (V), determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t), including: The first stage of the j-th frequency modulation cycle is divided into multiple first time points; According to the target frequency modulation signal f g (t), determine the first target frequency value corresponding to the plurality of first time points respectively; Based on the actual relationship f i1 (V), determine the first actual modulation voltage value corresponding to each of the first target frequency values, and obtain the actual modulation voltage values ​​corresponding to the plurality of first time points respectively; Based on the actual modulation voltage values ​​corresponding to the plurality of first time points, the modulation voltage signal V corresponding to the first stage of the j-th frequency modulation cycle is determined. j (t); and The second stage of the j-th frequency modulation cycle is divided into multiple second time points; According to the target frequency modulation signal f g (t), determine the second target frequency value corresponding to the plurality of second time points respectively; Based on the actual relationship f i2 (V), determine the second actual modulation voltage value corresponding to each second target frequency value, and obtain the actual modulation voltage values ​​corresponding to the plurality of second time points respectively; Based on the actual modulation voltage values ​​corresponding to the plurality of second time points, the modulation voltage signal V corresponding to the second stage of the j-th frequency modulation cycle is determined. j2 (t); The modulation voltage signal V corresponding to the first stage of the j-th frequency modulation cycle j1 (t), and the modulation voltage signal V corresponding to the second stage of the j-th frequency modulation cycle. j2 (t) is determined to be the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t).

5. The method according to claim 3, characterized in that, In determining the modulation voltage signal V corresponding to the j-th frequency modulation period j Following (t), the method further includes: Obtain the actual frequency signal f corresponding to the j-th frequency modulation period. j (t), and divide the j-th frequency modulation period into multiple time points; For each time point, calculate the actual frequency signal f. j (t) and the target frequency modulation signal f g The degree of matching of (t); If the matching degree meets the preset conditions, determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t) represents the target modulated voltage signal.

6. The method according to claim 5, characterized in that, The calculation of the actual frequency signal f j (t) and the target frequency modulation signal f g The matching degree of (t) includes: Calculate the actual frequency signal f j (t) and the target frequency modulation signal f g The ratio of (t) is used to obtain the matching degree corresponding to each time point; If the matching degree meets the preset conditions, determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t) represents the target modulated voltage signal, including: Calculate the absolute value of the difference between the matching degree corresponding to each time point and 1; When the absolute value at each time point is less than a first preset value, the modulation voltage signal V corresponding to the j-th frequency modulation cycle is determined. j (t) represents the target modulation voltage signal; or, The calculation of the actual frequency signal f j (t) and the target frequency modulation signal f g The matching degree of (t) includes: Calculate the actual frequency signal f j (t) and the target frequency modulation signal f g The difference between (t) is used to obtain the matching degree corresponding to each time point; If the matching degree meets the preset conditions, determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t) represents the target modulated voltage signal, including: If the matching degree at each time point is less than the second preset value, then the modulation voltage signal V corresponding to the j-th frequency modulation cycle is determined. j (t) represents the target modulated voltage signal.

7. A linear frequency modulation nonlinear calibration device for optical signals, characterized in that, The device includes: The acquisition module is used to acquire the modulation voltage signal V of the input light source during the i-th frequency modulation cycle. i (t) and the actual frequency signal f of the light signal output by the light source. i The relationship between (t) is used to obtain the actual correlation f corresponding to the i-th frequency modulation period. i (V), where i is a positive integer; The determination module is used to determine the target frequency modulation signal f. g (t) and the actual relationship f i (V), determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle. j (t), where j takes the value of i+1; The frequency modulation module is used to modulate the voltage signal V. j (t) Input the light source to achieve frequency modulation of the optical signal during the j-th frequency modulation cycle; Specifically, the acquisition module is used to divide the i-th frequency modulation period into multiple time points; acquire the modulation voltage value and actual frequency value corresponding to each of the multiple time points, and obtain the actual correlation f. i (V); The determining module is specifically used to divide the j-th frequency modulation period into multiple time points; and according to the target frequency modulation signal f g (t), determine the target frequency values ​​corresponding to the multiple time points in the j-th frequency modulation cycle; based on the actual correlation f i (V), determine the actual modulation voltage value corresponding to each of the target frequency values, and obtain the actual modulation voltage values ​​corresponding to the plurality of time points in the j-th frequency modulation cycle; determine the modulation voltage signal V corresponding to the j-th frequency modulation cycle based on the actual modulation voltage values ​​corresponding to the plurality of time points in the j-th frequency modulation cycle. j (t).

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the linear frequency modulation nonlinear calibration method for optical signals as described in any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the linear frequency modulation nonlinear calibration method for optical signals as described in any one of claims 1 to 6.

Images