Radar Distance Determination Using Lookup Table Correlation
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Solution Overview
Problem
Advanced driver-assistance systems (ADAS) using radar struggle to accurately determine object distances, especially in varying weather conditions, due to interference from noise and interference signals, which affects the reliability of distance measurement.
Innovation Solution
A method involving a radar system that transmits a phase-modulated continuous waveform (PMCW) signal, converts the reflection signal into a reflection code sequence, and uses a lookup table to determine object distance by correlating the reflection code sequence with assistance code sequences, reducing computational complexity through a lookup table referencing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional correlation methods are used to determine object distance, then measurement precision is maintained, but device complexity and computational burden increase
Solution Approach 1:
The patent pre-calculates and stores correlation values between code sequences and received signals in a lookup table before actual distance measurement is needed. This preliminary computation stores the results of complex correlation operations, so that during actual operation, the system only needs to perform simple table lookups and comparisons rather than executing full correlation algorithms in real-time.
Solution Approach 2:
The patent creates a simplified copy of the correlation computation process by storing pre-computed correlation results in a lookup table. Instead of performing the actual complex correlation calculation during measurement, the system uses the stored correlation patterns as references, replacing computationally intensive operations with simpler data retrieval and comparison operations.
2Measurement precision
If complex correlation calculations are performed in real-time, then measurement accuracy is maintained, but processing time increases
Solution Approach 1:
The patent performs the computationally intensive correlation calculations in advance and stores the results in a lookup table. During actual distance determination, the system retrieves pre-computed correlation values from the table based on the received signal characteristics, avoiding the need to perform complex real-time calculations while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical computation process (real-time correlation calculation) with an information-based approach (lookup table retrieval). Instead of executing complex mathematical operations during measurement, the system uses stored correlation patterns and compares them with current signal characteristics, substituting computational mechanics with information retrieval and pattern matching.
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 enhances the accuracy and efficiency of object distance determination by distinguishing reflection signals from noise, improving the radar system's ability to measure distances in diverse environmental conditions.
Implementation Method 1
receiving a reflection signal produced by a transmission signal reflecting from the object
Implementation Method 2
determining a distance from the object based on a time difference between a transmission time point of the transmission signal and a reception time point of the reflection signal
Data Source
AI summary
A method of determining a distance from an object performed in an apparatus including a radar, the method including receiving a reflection signal produced by a transmission signal reflecting from the object, the transmission signal being modulated by a default code sequence; converting the reflection signal into a reflection code sequence; generating a subject correlation vector including at least one correlation between at least one assistance code sequence and the reflection code sequence; and determining a distance corresponding to the subject correlation vector by referencing a lookup table storing at least one reference correlation vector including at least one correlation between the at least one assistance code sequence and the default code sequence.