Radar Pulse Transmission Order for Far Distance Detection
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Solution Overview
Problem
Conventional radar apparatuses face challenges in detecting target objects within far distance ranges due to long transmission time intervals between pulse signals of different widths, leading to incomplete detection and poor signal-to-noise ratio improvement.
Innovation Solution
A radar apparatus that transmits close, medium, and far distance pulse signals in a specific order, with the far distance pulse signal being used in both initial and secondary detections to shorten transmission intervals and improve detection accuracy, and employs pulse compression techniques for the medium and far distance signals to synthesize detection results seamlessly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pulse signals with three kinds of pulse widths (short, medium, long) are transmitted in sequential order, then detection coverage across different distance ranges is improved, but the transmission time interval between pulse signals for far distance detection becomes excessively long
Solution Approach 1:
The patent implements a periodic transmission pattern where the long pulse signal for far distance detection is transmitted repeatedly at regular intervals rather than sequentially after medium and short pulse signals. This periodic action ensures that far distance detection opportunities occur frequently enough to maintain acceptable transmission time intervals while still providing comprehensive detection coverage across all distance ranges through the combination of different pulse width signals.
2Area of stationary object
If pulse signals are transmitted at given angle intervals in bearing direction, then spatial coverage is improved, but space between pulse signals in bearing direction becomes wider as they propagate farther, causing far distance targets to be missed
Solution Approach 1:
The patent segments the detection task by using different pulse width signals for different distance ranges: short pulse signals for close distance, medium pulse signals for medium distance, and long pulse signals for far distance. This segmentation allows each pulse type to be optimized for its specific range, with the long pulse signal providing sufficient energy and duration to detect far distance targets even when transmitted at angle intervals, thereby maintaining both spatial coverage and detection accuracy.
3Length of stationary object
If long pulse width signals are transmitted for far distance detection, then detection range is extended, but the reflection waves cannot be received while the pulse signals are transmitted, preventing close distance target detection
Solution Approach 1:
The patent uses periodic transmission of long pulse signals interspersed with transmissions of short and medium pulse signals. The periodic action creates distinct transmission phases where long pulse signals extend detection range during their transmission windows, while short pulse signals fill in close distance detection during their designated transmission phases, achieving both extended range and comprehensive multi-distance capability.
Solution Approach 2:
The patent segments the detection capability by assigning different pulse width signals to different distance ranges: long pulse signals for far distance detection when their transmission window is active, and short pulse signals for close distance detection. This segmentation resolves the contradiction by ensuring that close distance detection is handled by short pulse signals during their transmission phases, while long pulse signals handle far distance detection during their phases, providing adaptability across all distances.
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 configuration allows for accurate detection of target objects within far distance ranges by interpolating undetectable ranges and improving signal-to-noise ratio, while preventing interference with other radar systems and maintaining stable detection across varying distances.
Implementation Method 1
a radar apparatus, which transmits pulse signals having different pulse widths to detect a target object within a surrounding area of the radar apparatus
Implementation Method 2
receive reflection waves of the transmitted pulse signals
Implementation Method 3
perform a pulse compression on the reflection waves, so as to improve distance resolution and S/N (signal-to-noise ratio)
Implementation Method 4
performs a pulse integration of the given number of reception data by using FFT (Fast Fourier Transform), DFT (Discrete Fourier Transform), etc.
Data Source
AI summary
A radar apparatus is provided. The radar apparatus includes a transmission and reception unit configured to transmit a close distance pulse signal, a medium distance pulse signal, and a far distance pulse signal in an order of the close distance pulse signal, the far distance pulse signal, the medium distance pulse signal, and then the far distance pulse signal, and receive reflection waves of the transmitted pulse signals, the far distance pulse signal having a wider pulse width than the close distance pulse signal, the medium distance pulse signal having a pulse width wider than the close distance pulse signal and narrower than the far distance pulse signal, and a signal processor configured to generate a radar image by using a first detection result and a second detection result.