OPA control method based on phase switching time sequencing

Abstract

This invention relates to the field of optical radar technology, specifically providing an OPA control method based on phase switching time sorting. The method primarily involves reordering the scanning phases of the OPA within the measurement range, establishing a phase switching time function, arranging the corresponding groups of scanning phases and driving voltage values ​​to generate all possible arrangements, and then calculating to find the scanning phase arrangement that minimizes the phase switching time. This invention utilizes a sorting method to find the arrangement that minimizes the cumulative phase switching time among all achievable scanning angle arrangements. This minimizes the cumulative phase switching time of the overall OPA during scanning for different deflection phases, thus optimizing the upper limit of the system's operating speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical radar technology, and particularly provides an OPA control method based on phase switching time sequencing. BACKGROUND

[0002] At present, the main process of the optical phased array (OPA) laser radar control method is as follows: a corresponding relationship between the OPA deflection phase angle and the driving voltage is established through global scanning; when scanning in a two-dimensional field of view, the peripheral circuit writes configuration data into the control module, the driving voltage size is constantly changed by changing the configuration data, the light waveguide device is controlled to turn, and then the phase of the OPA deflection is adjusted. The data configuration time, the driving voltage establishment time and the device response time jointly constitute the phase switching time. In the above method, when sequentially scanning in the range of 0-2π, the driving voltage corresponding to the phase shows a certain randomness; when the control angle changes successively, the driving voltage sequence required has no obvious regularity in the numerical value, and a set of driving voltage sequence with discrete numerical value arrangement needs to be established, which leads to a great difference between the adjacent two driving voltage values, a longer voltage establishment time is required, and the total phase switching time is longer, which wastes more time resources for the establishment of the driving voltage value in the process of scanning by the system through the phase switching. SUMMARY

[0003] To solve the above problems, the present application provides an OPA control method based on phase switching time sequencing, which mainly reorders the scanning phase of the OPA in the to-be-measured range, finds the scanning phase arrangement that can minimize the phase switching time, and makes the OPA laser radar system have the shortest phase switching time in the process of constantly adjusting the driving voltage value to control the waveguide turning when detecting all the to-be-measured phases in the scene, so as to optimize the working speed of the system.

[0004] The OPA control method based on phase switching time sequencing provided by the present application comprises the following steps:

[0005] S1, scanning m phases in the to-be-measured range by using the OPA to obtain a corresponding group of scanning phases and driving voltage values;

[0006] S2, calculating the phase switching time The calculation function is as follows:

[0007]

[0008] Wherein, t ij_n represents the time required for the nth waveguide to switch from phase to phase .

[0009] S3, arrange the corresponding groups of scanning phases and driving voltage values to generate s arrangement cases;

[0010] S4, calculate the cumulative phase switching time C of the s arrangement cases, the calculation formula is:

[0011]

[0012] wherein k represents any one of the s arrangement cases, respectively represent the 1st scanning phase, the 2nd scanning phase, the 3rd scanning phase, …, the mth scanning phase in the kth arrangement case;

[0013] S5, sort the cumulative phase switching time of the s arrangement cases, select the arrangement case according to the sorting of the cumulative phase switching time, and the arrangement case corresponding to the minimum cumulative phase switching time is the optimal selection.

[0014] Preferably, the to-be-measured range is 0-2π.

[0015] Preferably, the method for establishing the corresponding groups of scanning phases and driving voltage values comprises an enumeration method and data fitting.

[0016] Preferably, the OPA is n-way, and the corresponding groups of scanning phases and driving voltage values are expressed by the enumeration method as wherein respectively represent the 1st scanning phase, the 2nd scanning phase, …, the mth scanning phase; V 1_1 , V 1_2 , V 1_3 , …, V 1_n respectively represent the driving voltage value required by the 1st waveguide, the driving voltage value required by the 2nd waveguide, …, the driving voltage value required by the nth waveguide when the scanning phase is ; V 2_1 , V 2_2 , V 2_3 , …, V 2_n respectively represent the driving voltage value required by the 1st waveguide, the driving voltage value required by the 2nd waveguide, …, the driving voltage value required by the nth waveguide when the scanning phase is ; V m_1 , V m_2 , V m_3 , …, V m_n respectively represent the driving voltage value required by the 1st waveguide, the driving voltage value required by the 2nd waveguide, …, the driving voltage value required by the nth waveguide when the scanning phase is ; and V

[0017] Preferably, the scanning phase and the corresponding group of driving voltage value are arranged by enumeration method, and m scanning phases can obtain s=m! non-repeated sequences, wherein m! represents the factorial of m.

[0018] Preferably, the driving voltage value is determined by the arrangement corresponding to the minimum cumulative phase switching time.

[0019] Compared with the prior art, the present application can achieve the following beneficial effects:

[0020] The present application uses the sequencing method to find the arrangement that can minimize the cumulative phase switching time in all the scanning angle sequences, which can minimize the cumulative phase switching time of the overall OPA for different deflection phase switching in the scanning process, and has an optimization effect on the upper limit of the system working speed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a flow chart of the OPA control method based on phase switching time sequencing provided by the present application. DETAILED DESCRIPTION

[0022] In the following, embodiments of the present application will be described with reference to the accompanying drawings. In the following description, the same modules are denoted by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not constitute a limitation on the present application.

[0024] Embodiment one:

[0025] Figure 1 The flow of the OPA control method based on phase switching time sequencing provided by the present application is shown.

[0026] As Figure 1 shown, the OPA control method based on phase switching time sequencing provided by the present application of embodiment one is calculated based on n-way OPA, n is a positive integer, and includes the following steps:

[0027] S1, using n-way OPA to scan m phases in the range of 0-2π, m is a positive integer, calibrating the correspondence between the scanning phase and the driving voltage value of the OPA, the calibration process is essentially to establish the correspondence between the scanning phase and the driving voltage value, and to establish a corresponding group of the scanning phase and the corresponding driving voltage value, the method of establishing the corresponding group can adopt enumeration method or data fitting, the process of data fitting is to do data fitting between the scanning phase and the driving voltage value, and to fit into a function, and the voltage value required for scanning a certain angle is found through the fitted function, which belongs to a relatively mature method in the field of data processing, and will not be described here. In this embodiment, the corresponding group of the scanning phase and the driving voltage value is expressed by enumeration method, and the corresponding group of the scanning phase and the driving voltage value is specifically represented as:

[0028] wherein, the first scanning phase, the second scanning phase, …, and the mth scanning phase are respectively;

[0029] V 1_1 , V 1_2 , V 1_3 , …, V 1_n are respectively the driving voltage value required for the first waveguide, the driving voltage value required for the second waveguide, …, and the driving voltage value required for the n-th waveguide when the scanning phase is .

[0030] V 2_1 , V 2_2 , V 2_3 , …, V 2_n are respectively the driving voltage value required for the first waveguide, the driving voltage value required for the second waveguide, …, and the driving voltage value required for the n-th waveguide when the scanning phase is .

[0031] V m_1 , V m_2 , V m_3 , …, V m_n are respectively the driving voltage value required for the first waveguide, the driving voltage value required for the second waveguide, …, and the driving voltage value required for the n-th waveguide when the scanning phase is .

[0032] S2, defining a phase switching time function, the phase switching time includes data configuration time, driving voltage establishment time and optical waveguide device response time, the phase switching time function is the maximum time required for the OPA to switch from one phase to another phase in the measured phase range, which is the maximum value of the time required for each waveguide to switch the phase. The calculation function is as follows:

[0033]

[0034] wherein t ij_1 is the time required for the first waveguide to switch from phase to phase , t ij_2 is the time required for the second waveguide to switch from phase to phase , and t ij_n represents the time required for the nth waveguide to switch from phase to phase .

[0035] S3, enumerate the corresponding groups of scanning phases and driving voltage values obtained in S1 to generate s arrangement cases, s = m!, m! represents the factorial of m.

[0036] S4, calculate the cumulative phase switching time C of each arrangement case for s arrangement cases. From the first scanning phase to the last scanning phase, the phase switching time sum between adjacent phases is the cumulative phase switching time. The calculation formula of the cumulative phase switching time Ck of any kth arrangement case in s arrangement cases is as follows: k

[0037]

[0038] wherein k represents any one of s arrangement cases, respectively represents the first scanning phase, the second scanning phase, the third scanning phase, …, and the mth scanning phase in the kth arrangement case.

[0039] Using the above method, the cumulative phase switching times C1, C2, C3, …, Cs of all s arrangement cases are calculated. s-1 s

[0040] S5, sort the minimum cumulative phase switching times corresponding to s arrangement cases obtained in S4, and select the arrangement case according to the sorting of the cumulative phase switching time. The arrangement case corresponding to the minimum cumulative phase switching time is the optimal selection. Usually, the arrangement case corresponding to the minimum cumulative phase switching time is used to determine the driving voltage value, and the driving voltage data configuration and driving voltage establishment are performed according to the arrangement case corresponding to the minimum cumulative phase switching time to generate the channel driving voltage and control the waveguide device to make the OPA scan and detect.

[0041] ​​​It should be noted that there can be more than one arrangement corresponding to the minimum cumulative phase switching time, and any one of them can be selected when this situation occurs, in addition, when the cumulative phase switching time difference is small, the arrangement corresponding to the non-minimum cumulative phase switching time can also be selected, and the present application mainly sorts the cumulative phase switching time, and uses the sequence of the cumulative phase switching time as the selection basis of the arrangement, to realize the optimization of the cumulative phase switching time.

[0042] Embodiment two:

[0043] The OPA control method based on phase switching time sorting provided by the embodiment two of the present application is realized by using a lookup table, and the specific steps are completely the same as those of the embodiment one, and the difference is that the corresponding group of the scanning phase and the driving voltage value in the embodiment one is used to establish a scanning phase and driving voltage value lookup table.

[0044]

[0045] According to the scanning phase and driving voltage value lookup table, the driving voltage data configuration and the driving voltage are established, the driving voltage of each channel is generated, the waveguide device of each channel is controlled, and the lookup table mode makes the data more clear and less prone to errors.

[0046] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

[0047] The specific embodiments of the present application do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A phase-switching time-sequenced-based OPA control method, characterized by, The method comprises the following steps: S1, scanning m phases in a to-be-measured range by using an OPA to obtain a corresponding group of scanning phases and driving voltage values; S2, calculating phase switching time The calculation function is as follows: where t ij_n represents the time needed for the nth waveguide to switch from phase to phase to phase S3, arranging the corresponding group of scanning phases and driving voltage values to generate s arrangement cases; S4, calculating cumulative phase switching time C of the s arrangement cases, and the calculation formula is: wherein k represents any one of s kinds of the arrangement cases, respectively represent the 1st scanning phase, the 2nd scanning phase, the 3rd scanning phase, …, the mth scanning phase in the kth arrangement case. S5, sorting the cumulative phase switching time of the s arrangement cases, selecting the arrangement cases according to the sorting of the cumulative phase switching time, and the arrangement case corresponding to the minimum cumulative phase switching time is the optimal selection.

2. The phase-switch time-ordering based OP A control method of claim 1, wherein, The to-be-measured range is 0-2π.

3. The phase-switch time-ordering based OP A control method of claim 1, wherein, The method for establishing the corresponding group of scanning phases and driving voltage values comprises an enumeration method and data fitting.

4. The phase-switch time-ordering based OP A control method of claim 3, wherein, OPA is n-way, using enumeration method to scan phase and the corresponding set of drive voltage value is expressed as Wherein The first scan phase, the second scan phase, …, the mth scan phase; V 1_1 , V 1_2 , V 1_3 , …, V 1_n The first scan phase, the second scan phase, …, the mth scan phase; V The first waveguide required drive voltage value, the second waveguide required drive voltage value, …, the nth waveguide required drive voltage value; V 2_1 , V 2_2 , V 2_3 , …, V 2_n The first scan phase, the second scan phase, …, the mth scan phase; V The first waveguide required drive voltage value, the second waveguide required drive voltage value, …, the nth waveguide required drive voltage value; V m_1 , V m_2 , V m_3 , …, V m_n The first scan phase, the second scan phase, …, the mth scan phase; V The first waveguide required drive voltage value, the second waveguide required drive voltage value, …, the nth waveguide required drive voltage value.

5. The phase-switch time-ordering based OP A control method of claim 1, wherein, The corresponding group of scanning phases and driving voltage values is arranged by using the enumeration method, and m scanning phases can obtain s=m! non-repeated sorting cases at most, wherein m! represents the factorial of m.

6. The phase-switch time-ordering based OP A control method of claim 1, wherein, The arrangement case corresponding to the minimum cumulative phase switching time is used to determine the driving voltage value.

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