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Phased array laser radar and scanning method of phased array laser radar

A technology of laser radar and phased array, which is applied in the field of radar, can solve the problems of reducing the working efficiency of phased array laser radar and increasing the complexity of working methods, so as to achieve the effect of reducing complexity and improving work efficiency

Pending Publication Date: 2021-10-22
BEIJING WANJI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a phased array laser radar and a scanning method of the phased array laser radar, which solves the problem of greatly reducing the working efficiency of the phased array laser radar in the prior art, and also increases the complexity of the working mode technical issues

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  • Phased array laser radar and scanning method of phased array laser radar
  • Phased array laser radar and scanning method of phased array laser radar
  • Phased array laser radar and scanning method of phased array laser radar

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Embodiment 1

[0061] figure 1 A schematic diagram of the top view structure of the phased array laser radar provided in Embodiment 1 of the present invention, as shown in figure 1 As shown, the phased array lidar provided in this embodiment includes: an SOI substrate, an input coupler 21 , a beam splitter 22 , a phase modulator group 31 , an optical antenna 23 and a protective layer.

[0062] Wherein, the input coupler 21, the beam splitter 22, the phase modulator group 31 and the optical antenna 23, which are sequentially connected by optical paths, are formed in the SOI substrate, and the protective layer is located at the input coupler 21, the beam splitter 22, and the phase modulator group 31 And above the optical antenna 23.

[0063] Specifically, such as figure 2 As shown, the SOI substrate includes: a bottom silicon layer 11 , a buried oxide layer 12 and a top silicon layer 13 .

[0064] Wherein, the buried oxide layer 12 is located in the middle of the bottom silicon layer 11 an...

Embodiment 2

[0097] Figure 4 A schematic diagram of the structure of the phase modulator group in the phased array laser radar provided by Embodiment 2 of the present invention, FIG. Such as Figure 4 As shown, the phase modulator group in the phased array laser radar provided in this embodiment is based on the phased array laser radar provided in Embodiment 1 of the present invention, and further refines the phase modulator group, then this embodiment The provided phased array lidar also includes the following technical solutions.

[0098] Further, in this embodiment, the number of phase modulator groups is two groups.

[0099] Wherein, the heating lengths of waveguides 311 corresponding to adjacent phase modulators in the first phase modulator group 31 are in a monotonically increasing proportional relationship, and the heating lengths of waveguides 311 corresponding to adjacent phase modulators in the second phase modulator group 32 are There is a monotonically decreasing proportion...

Embodiment 3

[0113] Figure 8 A schematic flow chart of the phased array lidar scanning method provided in Embodiment 3 of the present invention, as shown in Figure 8 As shown, the phased array laser radar scanning method provided in this embodiment is a scanning method performed on the basis of the phased array laser radar provided in Embodiment 1, then the scanning method of the phased array laser radar provided in this embodiment includes The following steps:

[0114] Step 101, determine the reference voltage value corresponding to each phase modulator in the phase modulator group, and each reference voltage value forms a reference voltage list.

[0115] Wherein, the reference voltage value is a corresponding voltage value when the light spot output by the phased array laser radar reaches the global best light spot shape. When the output spot reaches the global optimal spot shape, the light intensity is the strongest and the positions of the main lobe and grating lobe are consistent ...

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Abstract

The embodiment of the invention provides a phased array laser radar and a scanning method of the phased array laser radar. The phased array laser radar comprises an SOI substrate, an input coupler, a beam splitter, a phase modulator group, an optical antenna and a protection layer; the input coupler, the beam splitter, the phase modulator group and the optical antenna which are sequentially connected through an optical path are formed in the SOI substrate, and the protection layer is located above the input coupler, the beam splitter, the phase modulator group and the optical antenna; the waveguide heating lengths corresponding to adjacent phase modulators in the phase modulator group are in a monotone increasing or monotone decreasing equal ratio relation, and the phase modulators in the phase modulator group share a negative electrode and have independent positive electrodes. After the reference voltage of each phase modulator is determined, continuous scanning can be realized only by uniformly changing the voltage value of each phase modulator group. The working efficiency of the phased array laser radar is improved, and the working complexity is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the field of radar technology, and in particular to a phased array laser radar and a scanning method of the phased array laser radar. Background technique [0002] The concept of phased array lidar has long been proposed, and various design schemes are constantly being developed. The basic modules of the current phased array lidar chip include: light source module, beam splitting module and adjustment module, etc. The cooperation between these modules realizes the basic functions of lidar. [0003] In the phase modulator module of the existing phased array lidar, the phase modulator is usually set to heat the waveguide to adjust the phase of the light in the waveguide. The heating length on the waveguide of each phase modulator is the same length, and each phase modulator is connected in parallel. In this way, when the phased array laser radar is working, it is necessary to configure different voltages f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/481
CPCG01S7/4817
Inventor 王鹏飞徐洋张冶金于红艳潘教青邓永强
Owner BEIJING WANJI TECH
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