FMCW Radar Target Tracking Using Single-Sweep Extraction
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Solution Overview
Problem
Current radar systems using frequency modulated continuous wave (FMCW) for target tracking require longer operation times and consume more memory due to the need to scan both upsweep and downsweep frequency signals for relative frequency shift calculations, leading to reduced signal processing efficiency.
Innovation Solution
The method employs a simplified approach by using either the upsweep or downsweep frequency signal to calculate relative distance and speed, utilizing a sawtooth waveform and α-β filtering to track targets efficiently, reducing operation time and memory usage through Non-Coherent Integration within a designated range window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both upsweep and downsweep frequency signals are scanned to calculate relative frequency shift, then measurement precision of target position and speed is improved, but operation time increases and productivity decreases
Solution Approach 1:
The patent extracts and utilizes only the essential frequency information from either the upsweep or downsweep signal to calculate target position and speed, eliminating the need to process both complete sweep cycles. This extraction approach maintains measurement precision while reducing operation time and improving processing efficiency.
2Measurement precision
If both upsweep and downsweep frequency signals are scanned for relative frequency shift calculations, then measurement precision is improved, but memory consumption increases
Solution Approach 1:
The patent extracts only the necessary frequency data from a single sweep direction (either upsweep or downsweep) to perform relative frequency shift calculations, eliminating the need to store and process data from both sweep directions. This reduces memory consumption while preserving measurement accuracy.
3Reliability
If complete upsweep and downsweep frequency signal scanning is performed, then reliability of target detection is improved, but operation time increases
Solution Approach 1:
The patent applies partial action by processing only one frequency sweep direction (either upsweep or downsweep) instead of both, which is sufficient to achieve reliable target detection. This partial processing approach reduces operation time while maintaining detection reliability through the use of Non-Coherent Integration within a designated range window.
4Measurement precision
If Non-Coherent Integration is applied across the whole detected area, then measurement precision is improved, but device complexity and processing load increase
Solution Approach 1:
The patent segments the detection area into a designated range window and applies Non-Coherent Integration only within this segmented region rather than across the whole detected area. This segmentation reduces processing complexity and computational load while maintaining measurement precision for targets within the focused range window.
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 significantly reduces operation time and memory consumption while maintaining accurate target tracking, enhancing the overall efficiency of the radar system by simplifying signal processing and reducing the complexity of computing loading.
Implementation Method 1
If the relative frequency shift is generated between the transmitted signal St and the reflected signal Sr that is a Doppler frequency shift fd. A relative velocity exists between the radar and target
Implementation Method 2
The timing offset of the transmitted signal St and the reflected signal Sr is a delay time td, which is decided to the relative distance between the target and radar
Data Source
AI summary
The present invention relates to a target tracking method of radar with frequency modulated continuous wave, which transmits a transmitted signal to receive a return wave of the transmitted signal that is used for detecting the target and obtaining the relative distance between the target and the radar. The target tracking method includes transmitting a frequency modulated continuous wave and receiving the reflected wave; getting a reflected wave corresponding to the target by detecting the reflected wave; getting a range gate error by seeking the plurality of the range gates corresponding to the reflected wave; and getting a position and a speed of the target at next time by knowing the position of the target at present time basis of the range gate error. Hence, the relative distance between the radar and the target is got.