Laser Radar Intensity Modulation Frequency Segmentation
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Solution Overview
Problem
Current laser radar devices using intensity modulation pulse ToF systems cannot calculate physical property parameters such as the extinction coefficient of targets.
Innovation Solution
A laser radar device that includes a light source circuit for intensity-modulating laser light with different frequencies, a telescope for transmitting and receiving pulses, and a signal processor to calculate distance and extinction coefficient based on the received signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single intensity modulation frequency is used to identify hard targets, then the signal-to-noise ratio of hard target signals is improved, but the ability to calculate physical property parameters such as extinction coefficient is lost
Solution Approach 1:
The patent segments the measurement process into multiple intensity modulation frequencies, where each frequency provides different information about the target. By using multiple frequencies instead of a single frequency, the system can separately extract hard target position information and volume target physical property information, resolving the contradiction between hard target detection precision and physical property parameter calculation capability
Solution Approach 2:
The patent adds the frequency dimension to the intensity modulation process. By modulating at multiple different frequencies rather than a single frequency, the system creates additional measurement dimensions that allow simultaneous extraction of both hard target location and volume target extinction coefficient information, transforming a one-dimensional measurement into a multi-dimensional one
2Measurement precision
If intensity modulation is applied to extract hard target signals from volume targets, then hard target position can be calculated, but physical property parameters of volume targets cannot be determined
Solution Approach 1:
The patent makes the intensity modulation system multi-functional by using multiple modulation frequencies. The same intensity modulation mechanism serves dual purposes: identifying hard target positions through certain frequencies and calculating volume target physical property parameters through other frequencies, thereby achieving universal measurement capability without requiring separate systems
3Measurement precision
If a pulse multiplexing and demultiplexing system is used with single frequency modulation, then target position calculation is enabled, but the system complexity increases without gaining physical property parameter measurement capability
Solution Approach 1:
The patent changes the parameter of intensity modulation frequency from a fixed single value to multiple variable values. By adjusting the modulation frequency parameter across multiple values, the system achieves both accurate target position calculation and physical property parameter measurement without requiring fundamentally different system architectures, thus managing complexity through parameter variation rather than structural complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the calculation of physical property parameters like the extinction coefficient of targets, overcoming the limitations of existing systems.
Implementation Method 1
a light receiver to generate a reception electrical signal by photoelectrically converting the reception light
Data Source
AI summary
A laser radar device includes: a light source unit that outputs a plurality of intensity modulation pulses by periodically intensity-modulating laser light using intensity modulation signals having different frequencies; a telescope that transmits the plurality of intensity modulation pulses to a target and receives reflected light from the target as reception light; a light receiving unit that generates a reception electrical signal by photoelectrically converting the reception light; and a signal processing unit that calculates a distance and a physical property parameter of the target on the basis of the reception electrical signal.