Multi-Pulse Laser Radar Echo Timing for Interference Rejection
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Solution Overview
Problem
Conventional laser radar systems suffer from false echo signals and mutual interference due to dark counts and background light noise, leading to a high signal-to-noise ratio and inaccurate ranging results when multiple radars operate in the same region.
Innovation Solution
A multi-pulse anti-interference signal processing method and apparatus that sends multiple detection pulses with preset time intervals, captures and delays echo pulses, and processes them to eliminate false echoes and interference, improving the signal-to-noise ratio and accuracy of ranging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detector with high sensitivity is used to increase ranging distance, then the detection capability is improved, but dark count and background light noise are also amplified, causing false echo signals and reducing measurement precision
Solution Approach 1:
The patent segments the detection process into multiple pulse transmission cycles with different time intervals. By dividing the detection into multiple phases and comparing results across these segments, the system can identify and eliminate false echo signals while maintaining high sensitivity detection capability.
Solution Approach 2:
The patent implements a feedback mechanism where the receiver compares echo signals from multiple pulse transmissions. The system uses the time interval information and signal consistency feedback to distinguish real target echoes from false echoes caused by dark count and background light noise, thereby improving measurement precision while accounting for harmful factors.
2Productivity
If multiple laser radars operate in the same region simultaneously, then the coverage and productivity are improved, but mutual interference occurs between radars, causing false echo signals and reducing reliability
Solution Approach 1:
The patent employs periodic pulse transmission with specific time intervals between pulses from the same radar. This periodic action creates a temporal signature that allows the system to distinguish between echoes from its own pulses and interference from other radars, enabling multiple radars to operate simultaneously without mutual interference.
Solution Approach 2:
The patent dynamically adjusts the time interval between pulses based on the operating environment and radar density. By making the pulse transmission pattern adaptive and dynamic rather than fixed, the system can optimize performance and maintain reliable detection even when multiple radars operate in the same region.
3Device complexity
If conventional single-pulse detection is used, then the device complexity is low, but false echo signals cannot be distinguished from real signals, reducing measurement precision
Solution Approach 1:
The patent performs preliminary actions by transmitting multiple pulses with known time intervals before final echo identification. This preliminary pulse transmission phase establishes a reference pattern that simplifies the subsequent identification of real versus false echoes, achieving improved precision without proportionally increasing device 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
The method effectively eliminates false echoes and interference, enhancing the signal-to-noise ratio and accuracy of laser radar ranging by distinguishing real echo signals from interference, thereby improving detection performance.
Implementation Method 1
a laser radar receiver using a time of flight (TOF) principle is an optical-to-electrical converter that converts an optical signal into an electrical signal
Implementation Method 2
capturing a plurality of echo pulses generated by reflecting the plurality of detection pulses at the detection target
Data Source
AI summary
This application relates to a multi-pulse anti-interference signal processing apparatus. The multi-pulse anti-interference signal processing apparatus includes a detection pulse sending unit and a pulse receiving unit. The detection pulse sending unit is configured to emit a plurality of laser pulses to a target object based on a preset emission interval within a cycle. The pulse receiving unit is configured to receive a plurality of external signals within the cycle, obtain a reception interval between any two external signals, and determine, in the plurality of external signals based on the emission interval and the reception interval, an echo signal corresponding to the emitted laser pulses. A false echo pulse resulting from optical-to-electrical conversion and an interfering echo pulse fed back by other radar are effectively eliminated. Therefore, a signal-to-noise ratio of a target echo pulse is increased, mutual interference between a plurality of radars is effectively eliminated, and accuracy of ranging performed by a radar by using a laser pulse is improved.