Lidar Light Emitting Module Multi-Frequency Segmentation
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Solution Overview
Problem
Conventional phase-based laser radar systems face challenges in achieving both high detection accuracy and large detection range due to the trade-off between frequency and range, where higher frequency improves accuracy but reduces range, and lower frequency increases range but decreases accuracy.
Innovation Solution
The implementation of a light emitting module that outputs multiple high-frequency modulation signals with different frequencies, allowing for the emission of laser beams with varying frequencies, and an optical signal detection module that processes phase differences between reference and echo signals to determine accurate distance measurements, effectively combining high accuracy and large range through differential frequency processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-frequency modulation signals are used for distance measurement, then detection accuracy is improved, but detection range is reduced
Solution Approach 1:
The patent segments the detection process into multiple frequency components. Instead of using a single frequency signal, the system transmits and processes multiple modulation signals with different frequencies (including high frequencies for accuracy and low frequencies for range). This segmentation allows each frequency component to contribute to different aspects of the measurement, resolving the contradiction between accuracy and range.
Solution Approach 2:
The patent changes the frequency parameter of the modulation signals from a single fixed value to multiple variable values. By transmitting signals with different modulation frequencies and processing their phase differences, the system can simultaneously achieve high detection accuracy (from high-frequency components) and large detection range (from low-frequency components), thus resolving the technical contradiction.
2Length of stationary object
If low-frequency modulation signals are used for distance measurement, then detection range is increased, but detection accuracy is reduced
Solution Approach 1:
The detection process is segmented into multiple frequency components where low-frequency signals handle range measurement and high-frequency signals handle accuracy measurement. The system processes phase differences from multiple frequencies to combine the advantages of both low and high frequency signals, resolving the contradiction between range and accuracy.
Solution Approach 2:
The system changes the frequency parameter from a single low value to a spectrum of frequencies. By transmitting multiple modulation signals with different frequencies and processing their combined phase information, the system achieves both large detection range (from low-frequency components) and high detection accuracy (from high-frequency components).
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
This approach enables the laser radar system to achieve high detection accuracy and large detection range simultaneously by using high-frequency signals for precise measurement and low-frequency signals for extended range, while minimizing electromagnetic interference and improving detection speed.
Implementation Method 1
configured to emit at least two laser beams with different frequencies respectively modulated by the at least two preset high-frequency modulation signals with different frequencies
Implementation Method 2
the high-frequency modulation subunit is configured to perform frequency modulation on the initial light beam by using an optical mixing technology to transmit at least two high-frequency transmission signals with different frequencies
Implementation Method 3
the difference frequency subunit is configured to perform difference frequency processing on any two high-frequency transmission signals with different frequencies, and transmit at least one low-frequency transmission signal
Implementation Method 4
the first high-frequency echo signal is a laser beam after the first laser beam is reflected by a target object, and the second high-frequency echo signal is a laser beam after the second laser beam is reflected by a target object
Implementation Method 5
the signal processing unit is configured to: obtain a first reference distance value of the target object according to a first phase difference between the first reference signal and the first high-frequency echo signal
Data Source
AI summary
Provided are a light emitting module, a optical signal detection unit, an optical system and a laser radar system. The light emitting module comprises: a high-frequency modulation signal output unit (10), which is configured to output at least two preset high-frequency modulation signals with different frequencies; a laser emitting unit (20), which is connected with the high-frequency modulation signal output unit (10), and is configured to emit at least two laser beams with different frequencies after being respectively modulated by at least two high-frequency modulation signals with different frequencies; a reference signal emitting unit (30), which is connected with the high-frequency modulation signal output unit (10), and is configured to emit at least two reference signals with different frequencies after being respectively modulated by at least two high-frequency modulation signals with different frequencies.