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Rotor laser doppler and micro-doppler composite signal emulator

A laser Doppler and composite signal technology, applied in the field of rotor laser Doppler and micro-Doppler composite signal simulators

Inactive Publication Date: 2018-01-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0028] Another question is how to detect Δf through the echo of formula (9)?

Method used

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  • Rotor laser doppler and micro-doppler composite signal emulator
  • Rotor laser doppler and micro-doppler composite signal emulator
  • Rotor laser doppler and micro-doppler composite signal emulator

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Embodiment 1

[0063] This embodiment describes the optical path scheme using a rotor laser Doppler and micro-Doppler composite signal simulator of the present invention. Specific optical path schemes such as figure 1 shown.

[0064] 45-degree narrow line width (line width less than 50KHz) polarized laser with a wavelength of 532nm is output from the laser, and is split into two beams by a non-polarizing beam splitter 1, and a part of the reflected laser light passes through the non-polarizing beam splitter 2 and is reflected at 90 degrees After mirror reflection, a part of it is reflected by the non-polarizing beam splitter 2, and then the polarization is purified by the polarizing beam splitter 2, and enters the photodetector as the reference light for superheterodyne detection, and its frequency is f 532nm . The main laser beam passes through the non-polarizing beam splitter 1, and the transmitted part passes through the frequency shift of the acousto-optic modulator (AOM). The microwav...

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Abstract

The invention provides a rotor laser doppler and micro-doppler composite signal emulator, which belongs to the dynamo-electric signal processing and laser radar technology field. A special acousto-optic modulator bipass optical path is utilized to successfully create a rotor laser doppler and micro-doppler composite signal, for instance, a laser radar echo signal of a helicopter, so military targets that have rotors and move at a high speed is simulated. Furthermore, through integration of superheterodyne detection optical paths, the created signal is detected successfully. The military targets that have rotors and move at a high speed, such as a helicopter, can be identified accurately so that enemies and friends are distinguished and accidental injuries at a battle field are avoided. Although current researchers provide a theoretical formula of the laser radar echo doppler and micro-doppler frequency shift signal, such a laser echo signal is not created in a laboratory. The rotor laser doppler and micro-doppler composite signal emulator is capable of effectively creating such laser echo signals, and the signals can be integrated with detection optical paths, so successful detection is realized.

Description

technical field [0001] The invention relates to a rotor laser Doppler and micro-Doppler composite signal simulator, belonging to the technical fields of electromechanical signal processing and laser radar. Background technique [0002] Accurate identification of high-speed moving military targets (such as helicopters) with rotors can separate friends from foes to avoid accidental injury on the battlefield. At present, researchers have done a lot of theoretical work on the lidar recognition of high-speed moving military targets with rotors, and have given theoretical formulas for lidar echo Doppler and micro-Doppler frequency shift signals. However, how to construct such a method in the laboratory? The laser echo signal can provide a basis for further accurate detection and signal analysis, but there is no effective method yet. The invention proposes a rotor laser Doppler and micro-Doppler composite signal simulator, which can effectively construct such a laser echo signal, ...

Claims

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Application Information

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IPC IPC(8): G01S7/48G01S7/497
Inventor 曹强杨江陵杜渐赵宏鸣高阳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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