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Distance and speed determination method and device for laser radar

A technology of laser radar and determination method, which is applied in the direction of measuring device, utilization of re-radiation, re-radiation of electromagnetic waves, etc., can solve the problem that the balance detector cannot distinguish the frequency signal phase, etc.

Active Publication Date: 2022-05-03
北京摩尔芯光科技有限公司
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Problems solved by technology

[0004] However, balanced detectors cannot distinguish the phase of the frequency signal, resulting in the measurement of the rising interval beat frequency signal and falling interval beat signal are positive

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  • Distance and speed determination method and device for laser radar
  • Distance and speed determination method and device for laser radar
  • Distance and speed determination method and device for laser radar

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0048] As introduced in the background technology, when the frequency shift caused by the Doppler effect (that is, the frequency shift caused by speed) is greater than the frequency shift caused by the distance, the existing technology will appear that the speed of the target object relative to the lidar and distance calculation errors.

[0049] For example, see Figure 1a As shown, when the target object is moving away from the FMCW lidar, the transmitted signal (solid line), the e...

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Abstract

The invention provides a distance and speed determination method and device for a laser radar. The method comprises the following steps: measuring an ascending interval beat frequency signal, a constant frequency interval beat frequency signal and a descending interval beat frequency signal between a transmitting signal and an echo signal; and determining the speed and distance of the target object relative to the laser radar according to the rising interval beat frequency signal, the constant frequency interval beat frequency signal and the falling interval beat frequency signal. Because the method can measure the constant frequency interval beat frequency signal, the speed and distance of the target object relative to the laser radar can be accurately calculated by combining the rising interval beat frequency signal and the falling interval beat frequency signal on this basis.

Description

technical field [0001] The present application relates to the technical field of radar signal processing, and in particular to a method and device for determining range and velocity for lidar. Background technique [0002] Lidar (such as FMCW Lidar) emits a continuous wave with changing frequency during the sweep period. The echo reflected by the target object has a certain frequency difference from the transmitted signal. By measuring the frequency difference, the distance between the target object and the Lidar can be obtained. distance and speed. [0003] At present, the distance velocity determination method used for laser radar is to measure the beat frequency signal in the rising interval through the balance detector under the condition of triangular wave modulation of the laser and falling interval beat signal , then based on and Determine the velocity and distance of the target object relative to the lidar. [0004] However, balanced detectors cannot disting...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/34G01S17/58
CPCG01S17/34G01S17/58Y02A90/10
Inventor 夏平杰张邦宏
Owner 北京摩尔芯光科技有限公司