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Phase modulation distance measurement and speed measurement coherent laser radar method and device

A technology of phase modulation and laser radar, which is applied in the direction of measuring devices, radio wave measuring systems, instruments, etc., can solve the problems of limited pulse repetition frequency and high cost

Inactive Publication Date: 2020-11-27
孙建锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the hardware conditions of the laser, the cost is high, the pulse repetition frequency is limited, and the frequency modulation nonlinearity is still an unsolved problem.

Method used

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  • Phase modulation distance measurement and speed measurement coherent laser radar method and device
  • Phase modulation distance measurement and speed measurement coherent laser radar method and device
  • Phase modulation distance measurement and speed measurement coherent laser radar method and device

Examples

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Effect test

Embodiment 1

[0092] Embodiment 1: Phase modulation distance measurement and speed measurement coherent laser radar method, the narrow line width single-frequency single-mode continuous laser light source in the radar platform produces an output beam polarized and then divided into a local oscillator beam and an emission beam by the first beam splitter; the emission beam After phase modulation, it is amplified and transmitted to the second beam splitter to be divided into a probe beam and a reference beam, and the probe beam is sent to the target and the echo beam carrying the target distance and motion Doppler information is received; the local oscillator beam passes through the third The beam splitter is divided into local oscillator one beam and local oscillator two beams; the first local oscillator beam and the echo beam are coherently mixed through the first optical bridge, and the first intermediate frequency signal is obtained by balanced reception, and the first intermediate frequency...

Embodiment 2

[0097] Embodiment 2: phase modulation distance measurement and speed measurement coherent laser radar method, such as figure 1 As shown, including laser light source 1, an eye-safe 1550nm single-mode narrow-linewidth single-mode continuous fiber laser is used, the laser linewidth is 10kHz, the output power is 20mW, and the fiber output has isolation protection; the laser light source produces unmodulated single-frequency The single-mode continuous coherent laser is used as the output beam, which is polarized by the polarizer 2 to increase the degree of polarization and ensure that the polarization extinction ratio is greater than 25dB, expressed as:

[0098] E. 0 (t)=E 0 exp[j2πf 0 t+jφ N0 +jφ 0 ];

[0099] where f 0 is the frequency of the laser light source; φ 0 is the initial phase of the output beam; φ N0 is the noise phase of the output beam; E0 is the amplitude of the output beam, t is the time, exp is an exponential function with a natural constant e as the ba...

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Abstract

The invention discloses a phase modulation distance measurement and speed measurement coherent laser radar method and device. An output light beam is divided into a local oscillation light beam and anemission light beam through a first beam splitter; the emitted light beam is transmitted to a second beam splitter to be divided into a detection light beam and a reference light beam, the detectionlight beam is emitted to a target and an echo light beam is received; the local oscillation light beam is divided into a first local oscillation light beam and a second local oscillation light beam through a third beam splitter; coherent light mixing is carried out on a local oscillator light beam I and an echo light beam to obtain first sampling data; coherent light mixing is carried out on a local oscillator light beam II and a reference light beam to obtain second sampling data, and a field programmable gate array is used for processing the first sampling data and the second sampling data to obtain an echo phase sequence and a reference phase sequence; and the echo phase sequence and the reference phase sequence are processed to respectively obtain the motion vector speed and distance of the target. According to the invention, the hardware requirement of the laser radar can be reduced, high-resolution and high-precision distance measurement and speed measurement are realized, and the whole system is miniaturized and easy to operate.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a method and device for phase modulation ranging and speed measuring coherent laser radar. Background technique [0002] Lidar can not only obtain information such as distance and speed of targets with high precision and high accuracy, but also can realize 3D high-resolution imaging of long-distance targets, which plays an important role in the fields of surveying, mapping and navigation. According to the different transmission signals, lidar can be divided into two categories: pulse lidar and continuous wave lidar. [0003] Pulsed laser radar uses pulsed light signals as detection signals, and obtains target distance information by accurately measuring the flight time of reflected light pulses. Pulse lidar adopts a direct detection system, and its resolution is relatively low. In order to improve the distance resolution, short pulses with low delay and jitter and ultra-fast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/58G01S7/481G01S7/483
CPCG01S7/481G01S7/483G01S17/58
Inventor 职亚楠孙建锋潘卫清戴恩文
Owner 孙建锋
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