Radar Signal Processing Using Alternating Frequency Slope Segmentation
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Solution Overview
Problem
Existing radar systems, such as FMCW and two-frequency CW systems, face challenges in accurately measuring distance and speed of targets, especially when multiple targets are present or when targets have similar relative speeds, leading to erroneous data and reduced accuracy.
Innovation Solution
A radar apparatus with a signal processing method that alternately uses modulating sections with and without frequency slopes, allowing for independent measurement of distance and speed by comparing results between adjacent sections to verify correctness and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If FMCW system uses single frequency slope for distance and speed measurement, then measurement process is simple, but measurement accuracy deteriorates for high-speed targets in near distance
Solution Approach 1:
The measurement process is segmented into multiple modulation sections with different frequency slopes. Each section measures distance and speed independently, allowing verification of results across sections to eliminate erroneous data while maintaining simple individual measurement processes.
Solution Approach 2:
The radar alternates between modulation sections with different frequency slopes in a periodic manner. This periodic switching enables multiple measurements under varying conditions, improving accuracy for high-speed targets while keeping each individual measurement section simple.
2Device complexity
If radar uses conventional modulation system, then device structure is simple, but erroneous detection increases when multiple targets are present
Solution Approach 1:
The detection process is divided into multiple modulation sections, each producing independent distance and speed measurements. By comparing results across sections, the system identifies and eliminates erroneous detections caused by multiple targets, improving reliability without complicating the overall device structure.
Solution Approach 2:
The system uses feedback from multiple modulation sections to verify measurement results. When measurements from different sections disagree, the system identifies potential errors and eliminates inconsistent data, thereby improving detection reliability while maintaining simple modular device architecture.
3Productivity
If single modulation section is used for measurement, then measurement process is fast, but erroneous data cannot be identified or eliminated
Solution Approach 1:
The radar performs rapid periodic measurements across multiple modulation sections. This periodic action maintains high measurement speed while enabling cross-verification of results to identify and eliminate erroneous data, achieving both fast productivity and high precision.
Solution Approach 2:
Multiple measurements are performed in advance across different modulation sections before final result determination. This preliminary action allows the system to have multiple candidate measurements ready for verification, enabling fast identification and elimination of erroneous data while maintaining measurement speed.
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 reliability of distance and speed measurements by reducing erroneous data output and improving the detection of multiple targets, even when they have similar relative speeds, thereby improving the performance in vehicle-to-vehicle distance control and monitoring applications.
Implementation Method 1
This radar apparatus detects the intensity of reflected wave received, Doppler shift of frequency, and a propagation time up to reception of the reflected wave from radiation of the radio wave
Implementation Method 2
detects the intensity of reflected wave received, Doppler shift of frequency, and a propagation time up to reception of the reflected wave from radiation of the radio wave
Data Source
AI summary
The radar apparatus of the present invention can obtain distance to a target and speed with higher accuracy even when multiple targets are running within a detecting field of a radar. The radar apparatus can transmit a radio wave by alternately switching a section having a frequency slope and a section having no frequency slope with the radar for simultaneously transmitting a couple of frequencies having a frequency difference. Measurement of distance to the target and relative speed is conducted in the above two sections, results of measurement are compared with each other in the adjacent sections, and the result of measurement is determined correct only when there is no inconsistency in these measurement results.