CN-121995351-A - Laser radar body target echo generating device

CN121995351ACN 121995351 ACN121995351 ACN 121995351ACN-121995351-A

Abstract

The specification provides a laser radar target echo generating device, and relates to the technical field of laser radar target characteristic digital simulation and high-repetition-frequency narrow-pulse laser echo regeneration. The device screens a body target simulation model matched with a body target from a typical target model library through a laser radar body target echo simulation system, performs multi-channel optical characteristic simulation on the body target by using the laser radar to generate body target echo simulation data of the laser radar on the typical target under different intersection conditions, performs half-bandwidth nanosecond pulse echo detection according to the body target echo simulation data, converts a pulse current signal into an electric pulse signal without distortion, converts the electric pulse signal into an optical pulse signal without distortion, and modulates optical pulse power in a single pulse in real time. The method solves the problems that the current laser radar point target echo generating device is simple in generated target echo characteristics and is difficult to simulate the real echo characteristics.

Inventors

ZHANG SHIMIN
MA CHAO
LI HUI
LI YIHONG
LI DONGSHU
LI QIQI
LI YUZHAO

Assignees

北京遥感设备研究所

Dates

Publication Date: 20260508
Application Date: 20251216

Claims (10)

1. The laser radar target echo generating device is characterized by comprising a laser radar target echo simulation system and a laser radar target echo generating module; The system comprises a laser radar body target echo simulation system, a laser radar system and a laser radar system, wherein the laser radar body target echo simulation system is used for screening a body target simulation model matched with a body target from a pre-established typical target model library; the laser radar body target echo generation module is used for carrying out pulse echo detection with half bandwidth of nanosecond level according to the body target echo simulation data, converting a pulse current signal into an electric pulse signal without distortion, converting the electric pulse signal into an optical pulse signal without distortion, modulating optical pulse power in a single pulse in real time, and realizing random laser waveform modulation.
2. The apparatus of claim 1, wherein the laser radar body target echo simulation system comprises a target model library building unit, a body target model screening unit, a laser radar model and parameter configuration unit, a body target characteristic simulation unit, and an echo power calculation unit, wherein: The target model library establishing unit is used for establishing a typical target model library, wherein the typical target model library is a target three-dimensional entity model constructed by adopting a face element method, and the target three-dimensional entity model comprises a coordinate system definition mode, a face element number, a grid size, a skin material, a coating color and a reflectivity; the body target model screening unit is used for screening a body target simulation model matched with a body target from the typical target model library; The laser radar model and parameter configuration unit is used for setting a laser radar model and setting laser radar multichannel parameters; the body target characteristic simulation unit is used for simulating the laser radar to irradiate a body target from multiple angles by using the laser radar model and the body target simulation model and acquiring multi-channel echo data; the echo power calculation unit is used for calculating the intersection track and the irradiation area according to the multi-channel echo data and combining with preset intersection conditions, so as to further determine the echo power of each bin.
3. The apparatus of claim 2, wherein the library of representative target models encompasses a target three-dimensional model and a target surface material reflectance property model.
4. The apparatus of claim 3, wherein the lidar multichannel parameters include a number of lidar channels, a multichannel lidar angle, a lidar wavelength, a transmit module coordinate system, a transmit module tilt angle, a transmit module view angle, a transmit power, a transmit pulse width, a repetition frequency, a receive module coordinate system, a receive module tilt angle, a receive module view angle, a receive module optical aperture, a receive module photoelectric responsivity; the meeting conditions comprise a laser radar starting point, a laser radar speed, a laser radar gesture, a target starting point, a target speed and a target gesture.
5. The apparatus according to claim 4, wherein the volume target characteristic simulation unit is specifically configured to: Based on the characteristics of the body target echo, a rich target optical model library is established, and under a complex intersection scene, the laser radar multichannel body target echo is calculated; the echo power calculation unit is specifically configured to: And combining intersection conditions, the positions of all channels, the inclined angle and the view angle to judge detection conditions, counting the area of an irradiated area of a body target and the effective echo power received by a laser radar, and storing multi-channel body target echo data.
6. The system according to claim 5, wherein the laser radar body target echo generation module comprises a pulse echo detection module, a body target echo electric signal generation module and any laser echo generation module; the pulse echo detection module, the body target echo electric signal generation module and the arbitrary laser echo generation module are sequentially connected; The pulse echo detection module is used for converting the optical pulse input by the optical fiber into a TTL electric pulse signal and transmitting the TTL electric pulse signal to the control system through a port; the body target echo electric signal generation module is used for converting laser radar body target echo data into electric pulse signals through a DAC, filtering, power control and amplification processing are carried out on DAC output signals, and then 1-path control signals are output in a time-sharing N-path mode through a1 XN-end switch matrix; The arbitrary laser echo generating module is used for converting the body target echo electric pulse signal into an optical pulse signal, modulating the optical pulse signal power according to the body target echo electric signal amplitude, modulating the optical pulse power in a single pulse in real time, and linearly loading the body target echo electric signal into the optical signal without distortion.
7. The apparatus of claim 6, wherein the arbitrary laser echo generation module is specifically configured to: Based on the characteristics of the body target echo, the optical carrier radio technology is used, the driving capability of the body target echo electric signal is increased through a driving circuit, driving current containing modulation information is generated through an electro-optical modulation control module, the driving current is loaded on a high-speed laser, and an optical power waveform corresponding to the body target echo electric signal voltage is generated, so that arbitrary waveform modulation is realized.
8. The apparatus of claim 7, wherein the body target echo electrical signal generation module comprises a DAC model, a filtering module, a power amplification module, and a 1 XN-terminal switch matrix.
9. The apparatus of claim 8, wherein the arbitrary laser echo generation module comprises a driving circuit, a laser, and an attenuator.
10. A method for generating a target echo of a laser radar, applied to the device of any one of claims 1 to 9, comprising: The system comprises a laser radar body target echo simulation system, a body target simulation model, a multi-channel optical characteristic simulation system and a target simulation system, wherein the body target simulation model is matched with a body target is screened from a pre-established typical target model library; The laser radar body target echo generation module is used for carrying out pulse echo detection with half bandwidth of nanosecond level according to the body target echo simulation data, converting a pulse current signal into an electric pulse signal without distortion, converting the electric pulse signal into an optical pulse signal without distortion, modulating optical pulse power in a single pulse in real time, and realizing random laser waveform modulation.

Description

Laser radar body target echo generating device Technical Field The document relates to the technical field of laser radar target characteristic digital simulation and high-repetition-frequency narrow pulse laser echo regeneration, in particular to a laser radar target echo generating device. Background With the development of the laser radar technology, the functions and application scenes of the laser radar are more and more abundant and more powerful, and particularly the laser detection technology is an indispensable part of the national defense field and the civil field. The research and development of any product are not carried out in the test link, and the laser radar is no exception. In the past, the testing of laser radar products is often limited by complex testing environments, changeable weather and changeable working postures, so that the laser radar products have long development period and large budget expense. Then, the laser radar target echo generating device has been developed. Most laser radar target echo generating devices simplify the body target into a point target, neglect the body target characteristics of the target under the complex intersection condition, and simplify the body target into a large quantity of loss of key information of the target echo characteristics after the point target. Therefore, only basic functions of the laser radar product can be tested, the testing function is single, and the defects that complex targets are difficult to verify, the testing function is lack of comprehensiveness and the like exist. At present, few research is carried out on a laser radar body target echo generating device with high repetition frequency and narrow pulse width in China. Firstly, considering real intersection conditions and body target characteristics, the laser radar body target echo characteristics are complex and variable, and the simulation difficulty is high. Secondly, the research on the echo characteristics of the target of the laser radar body is less, and related databases and technical support are lacked. Finally, the laser radar target echo with high repetition frequency and narrow pulse width is generally within tens of nanoseconds, and the acquisition, simulation, waveform analysis and generation of the light pulse of the target echo waveform are more difficult. Therefore, there is a need for an echo generating device, which solves the problems of low accuracy, few target types and high test cost of the target echo characteristics caused by single simulation meeting conditions, because the generated target echo characteristics are simple and the real echo characteristics are difficult to simulate. Disclosure of Invention The specification provides a laser radar target echo generating device, which is used for solving the problems that the current laser radar point target echo generating device is simple in generated target echo characteristics, difficult to simulate the real echo characteristics, low in target echo characteristic accuracy caused by single simulation intersection condition, few in target types and high in test cost. In a first aspect, the present specification provides a laser radar target echo generating device, including a laser radar body target echo simulation system, a laser radar body target echo generating module; The system comprises a laser radar body target echo simulation system, a laser radar system and a laser radar system, wherein the laser radar body target echo simulation system is used for screening a body target simulation model matched with a body target from a pre-established typical target model library; the laser radar body target echo generation module is used for carrying out pulse echo detection with half bandwidth of nanosecond level according to the body target echo simulation data, converting a pulse current signal into an electric pulse signal without distortion, converting the electric pulse signal into an optical pulse signal without distortion, modulating optical pulse power in a single pulse in real time, and realizing random laser waveform modulation. In a second aspect, the present specification provides a method for generating a target echo of a lidar, including: The system comprises a laser radar body target echo simulation system, a body target simulation model, a multi-channel optical characteristic simulation system and a target simulation system, wherein the body target simulation model is matched with a body target is screened from a pre-established typical target model library; The laser radar body target echo generation module is used for carrying out pulse echo detection with half bandwidth of nanosecond level according to the body target echo simulation data, converting a pulse current signal into an electric pulse signal without distortion, converting the electric pulse signal into an optical pulse signal without distortion, modulating optical pulse power in a single pulse in real time, and realizing