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Composite-modulation-pulse-code-based 4D imaging photon counting laser radar

A composite modulated pulse and photon counting technology, applied in the re-radiation of electromagnetic waves, the use of re-radiation, measurement devices, etc., can solve the problem of missing target intensity information, achieve accurate identification and judgment, and enrich the effect of target information.

Inactive Publication Date: 2015-12-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem that the existing photon counting laser radar loses target intensity information. The present invention provides a 4D imaging photon counting laser radar based on composite modulation pulse coding

Method used

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specific Embodiment approach 1

[0024] Specific implementation mode 1: see figure 1 This embodiment is described. A 4D imaging photon counting lidar based on composite modulation pulse coding described in this embodiment includes a signal generator 1, a laser 2, an emission optical system 3, a one-way reflector 4, and a scanner 5 , a total reflection mirror 6, a receiving optical system 7, a narrow-band filter 8, a Gm-APD single-photon detector 9, and a signal processing module 10;

[0025] The composite modulated random pulse signal output end of the signal generator 1 is simultaneously connected with the composite signal input end of the laser 2 and the composite signal input end of the signal processing module 10, and the pulse signal output end of the laser 2 is connected with the pulse signal of the transmitting optical system 3. The signal input end is connected, and the optical signal output by the emission optical system 3 is transmitted through the one-way reflector 4 and then incident on the scanne...

specific Embodiment approach 2

[0026] Specific implementation two: see figure 2 Describing this embodiment, the difference between this embodiment and the 4D imaging photon counting lidar based on composite modulation pulse coding described in Embodiment 1 is that the specific process of the signal processing module 10 processing the received signal is as follows: :

[0027] Step 1: Shift and multiply the detection result output by the Gm-APD single-photon detector 9 and the local oscillator random sequence output by the signal generator 1 to obtain the radar signal delay time τ, through the following formula:

[0028] R=cτ / 2 (Formula 1),

[0029] Obtain the distance value R of the target, wherein the local oscillator random sequence output by the signal generator 1 is a composite modulated random pulse signal, and c represents the speed of light;

[0030] In step 2, delay compensation for the radar signal delay time τ is performed on the local oscillator pulse sequence output by the signal generator 1, ...

specific Embodiment approach 3

[0046] Embodiment 3: The difference between this embodiment and the 4D imaging photon counting lidar based on composite modulation pulse coding described in Embodiment 2 is that each local oscillator encoded pulse signal of the same amplitude described in step 2 is different. M 1 ,M 2 ,…M n The corresponding count result M of each echo pulse signal 1 ′,M 2 ′,…M n The process of obtaining ' is:

[0047] First, multiply the local oscillator encoded pulse signal with the amplitude n and the echo pulse sequence corresponding to the local oscillator encoded pulse signal with the amplitude to obtain the multiplication result,

[0048] Second, count the number of times of multiplication results obtained,

[0049] Finally, each local oscillator encoded pulse signal M with the same amplitude is obtained 1 ,M 2 ,…M n The corresponding count result M of each echo pulse signal 1 ′,M 2 ′,…M n '.

[0050] image 3 is the coding map of the traditional classical pseudo-random co...

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Abstract

The invention, which belongs to the technical field of the laser radar, provides a composite-modulation-pulse-code-based 4D imaging photon counting laser radar, so that a problem that the existing photon counting laser radar loses target strength information can be solved. The composite-modulation-pulse-code-based 4D imaging photon counting laser radar comprises a signal generator, a laser, a transmitting optical system, a unidirectional reflector, a scanner, a total reflection mirror, a receiving optical system, a narrow-band filter, a Gm-APD single photon detector, and a signal processing module. An optical signal outputted by the transmitting optical system is transmitted by the unidirectional reflector and is sent into the scanner; the scanner outputs an optical detection signal to a target; an echo signal reflected by the target is transmitted into the scanner; the echo signal outputted by the scanner is reflected by the unidirectional reflector and the total reflection mirror and the is transmitted to the transmitting optical system to carry out collection and echoing; the collected echo signal is filtered by the narrow-band filter and the is detected by the Gm-APD single photon detector; and a detection result is inputted into the signal processing module. The composite-modulation-pulse-code-based 4D imaging photon counting laser radar is mainly applied to target detection.

Description

technical field [0001] The invention belongs to the technical field of laser radar. Background technique [0002] Photon counting lidar can detect targets in the case of photon scarcity (less than one photon per echo pulse on average), so it has become a research hotspot in the field of lidar. However, because the single-photon detector used in it can only respond to the presence or absence of the signal, but not the intensity of the signal, the photon counting lidar loses one-dimensional important information - the target intensity. SUMMARY OF THE INVENTION [0003] The present invention is to solve the problem that the existing photon counting laser radar loses target intensity information, and the present invention provides a 4D imaging photon counting laser radar based on composite modulation pulse coding. [0004] A 4D imaging photon counting lidar based on composite modulation pulse coding, which includes signal generator, laser, transmitting optical system, one-way...

Claims

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Application Information

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IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 张子静赵远张勇靳辰飞徐路苏建忠吕华
Owner HARBIN INST OF TECH
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