LiDAR Transceiver Ranging Precision via Histogram Superposition
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Solution Overview
Problem
Current LiDAR systems face limitations in ranging accuracy due to the sampling frequency of the time-to-digital converter (TDC), which also leads to increased power consumption and manufacturing costs when attempting to improve accuracy.
Innovation Solution
A radar data transceiver system that includes a synchronization module, an emission module, and a receiving module, where the emission module delays the synchronization signal according to a preset policy to generate emission signals with fine jittering, and the receiving module superimposes histograms from multiple measurements to enhance ranging precision without increasing the sampling frequency of the TDC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling frequency of the TDC is increased to improve ranging accuracy, then the ranging accuracy is improved, but the power consumption is increased and manufacturing costs increase
Solution Approach 1:
The patent divides the ranging measurement process into multiple segments by performing n separate measurements (where n≥2) with different emission timing offsets. Each measurement captures partial timing information, and the final ranging result is obtained by combining these segmented measurements through histogram superposition, thereby achieving high precision without requiring high sampling frequency
Solution Approach 2:
The patent introduces a new dimension of time offset parameters (different emission timing offsets for each measurement) to enhance ranging precision. Instead of improving precision along the sampling frequency dimension, the system adds temporal diversity through multiple measurements with different timing offsets, achieving high accuracy in a different dimensional approach
2Measurement precision
If the sampling frequency of the TDC is increased to improve ranging accuracy, then the ranging accuracy is improved, but the manufacturing cost is increased
Solution Approach 1:
The patent changes the operational parameters of the system by introducing multiple measurement cycles with different emission timing offsets instead of relying on high TDC sampling frequency. This parameter transformation allows the use of lower-frequency, lower-cost TDC hardware while achieving the same or better ranging accuracy through computational processing of multiple measurements
3Measurement precision
If the sampling frequency of the TDC is increased to improve ranging accuracy, then the ranging accuracy is improved, but the reliability and stability of the chip deteriorate due to heat generation
Solution Approach 1:
The patent segments the high-precision ranging task into multiple lower-frequency measurements, reducing the instantaneous processing burden and heat generation on the TDC chip. By distributing the measurement workload across multiple cycles with different timing offsets, the system maintains high accuracy while reducing thermal stress and improving chip reliability
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 improves ranging precision, reduces manufacturing costs, and decreases power consumption by introducing a specific time difference between emitted signals, allowing for more accurate distance measurements without the need for higher TDC sampling frequencies.
Implementation Method 1
a photoelectric converter, configured to convert a received reflected signal into a current signal
Data Source
AI summary
A radar data transceiver, a ranging method, and a LiDAR are provided. The transceiver includes: a synchronization module, configured to generate a synchronization signal and send the synchronization signal to an emission module and a receiving module separately; the emission module, connected with the synchronization module and configured to delay the synchronization signal according to a preset delay policy, generate a first emission signal, and emit the first emission signal; and the receiving module, connected with the synchronization module and configured to receive a reflected signal, generate a first histogram according to the reflected signal and the synchronization signal, and superimpose histograms obtained by n measurements to generate an echo signal.