Laser Radar Distance Calculation Without Delay Unit Resetting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laser radars using pulse phase-difference encoding circuits struggle to accurately calculate distances when reflected light is successively received, especially in conditions with smoke or dust, as they require resetting delay units for each measurement, leading to incomplete time period measurements.
Innovation Solution
A laser radar system with a clock generator, projection unit, light reception unit, counter, delay circuit, time calculation unit, and distance calculation unit, where the clock signal is of constant period, allowing for continuous transmission and calculation of round trip time without resetting delay units, enabling distance calculation even with successive reflected light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If delay units are reset for each measurement in conventional laser radars, then measurement can be performed, but accurate distance calculation becomes impossible when reflected light is successively received
Solution Approach 1:
The delay circuit is configured to automatically reset after a predetermined period without requiring manual or control signal-based resetting. This preliminary configuration allows the circuit to be ready for the next measurement cycle automatically, enabling continuous measurement of successively received reflected light while maintaining accurate time period calculations for each pulse.
2Productivity
If delay units are not reset, then continuous measurement is possible, but time period measurement becomes incomplete for successive reflected light
Solution Approach 1:
The delay circuit is designed to automatically reset after a predetermined period corresponding to the maximum expected time of flight. This periodic automatic resetting ensures that each new pulse laser light measurement starts with a clean state, maintaining time period measurement accuracy while enabling continuous measurement of successively received reflected light without manual intervention.
3Reliability
If conventional pulse phase-difference encoding circuits are used, then distance measurement can be performed, but the system fails when reflected light is successively received due to reset requirements
Solution Approach 1:
The delay circuit is configured to automatically reset itself after a predetermined period without requiring external control signals. This self-service mechanism eliminates the need for complex control signal management, thereby improving system reliability when reflected light is successively received while reducing device complexity related to control signal generation and timing.
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 accurate and continuous calculation of distances to targets despite successive reception of reflected light, improving measurement efficiency and accuracy by eliminating the need for resetting delay units, thus overcoming limitations of conventional systems.
Implementation Method 1
calculates a distance to the object on the basis of speed of the pulse laser light and the round trip time
Data Source
AI summary
The laser radar includes a clock generator, a projection unit configured to project pulse laser light in synchronization with a clock signal, a light reception unit configured to receive reflected light, a counter configured to count a counter value which is the number of clock signals generated from a projection timing until a light reception timing, a delay circuit in which a plurality of stages of delay units are connected and to which the clock signal is successively input, and a time calculation unit configured to calculate a round trip time of the pulse laser light on the basis of the counter value and the number of hops which is the number of stages of the delay units to which a head of the clock signal is transmitted in a period of the clock signal including the light reception timing.