Radar Ranging Timing Point Selection for Saturated Echo Signals
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Solution Overview
Problem
Radar ranging systems face challenges in precisely calculating the time of flight for saturated echo signals, leading to increased distance errors due to echo signal clipping and broadening of the falling edge.
Innovation Solution
A method for determining timing points for saturated echo signals in radar ranging, involving the selection of a first timing point on the rising edge of the saturated sampling sequence and the subsequent determination of a second timing point based on the first timing point and the transmit signal waveform, allowing for precise calculation of distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional timing point selection methods are used for saturated echo signals, then the measurement process remains simple, but the time of flight calculation precision deteriorates due to echo signal clipping and falling edge broadening
Solution Approach 1:
The patent applies preliminary action by detecting saturation conditions before final timing point determination. The method first judges whether the echo signal is saturated, then selectively applies different timing point determination strategies based on this preliminary assessment, thereby maintaining precision while managing complexity through conditional processing
Solution Approach 2:
The patent changes the parameter selection for timing points based on signal saturation status. For saturated signals, it selects timing points from the rising edge portion where the signal remains reliable, rather than using fixed timing points. This parameter adaptation resolves the contradiction by adjusting the measurement approach according to signal conditions
2Reliability
If timing points are selected from saturated echo signals, then the ranging function can be maintained, but the measurement precision deteriorates due to loss of true signal information
Solution Approach 1:
The patent applies local quality by selecting timing points from specific portions of the echo signal waveform. For saturated signals, it chooses timing points from the rising edge region where the signal has not been clipped, thereby maintaining measurement precision while still functioning with saturated echoes. This localized selection preserves true signal information in the regions where it remains valid
Solution Approach 2:
The patent converts the harmful effect of signal saturation into a beneficial outcome by adapting the timing point selection strategy. Instead of discarding saturated signals, it exploits the rising edge portion that remains unsaturated, thereby maintaining both ranging reliability and precision even when the overall signal is saturated
3Ease of operation
If fixed proportion timing points are used on pulse waveforms, then the measurement process is simplified, but the measurement precision deteriorates when echo signals are saturated and peak locations cannot be determined
Solution Approach 1:
The patent applies dynamics by making the timing point selection adaptive rather than fixed. The method dynamically adjusts the timing point selection based on whether the echo signal is saturated or not, and based on the signal's waveform characteristics. This dynamic approach maintains ease of operation through automated selection while improving precision by adapting to actual signal conditions
Data Source
AI summary
The disclosure provides a radar ranging method and device, a radar, and an in-vehicle system. An example method includes: obtaining a pulse waveform of a transmit signal sent to a target object by a radar; obtaining a sampling sequence of an echo signal received by the radar; determining, in sampling points on a rising edge of the sampling sequence, a first timing point used to indicate a receive moment of the echo signal; determining, based on the first timing point and the pulse waveform of the transmit signal, a second timing point used to indicate a transmit moment of the transmit signal; and calculating a distance between the radar and the target object based on the first timing point and the second timing point.