CTFM Detection Apparatus Side Lobe Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dual demodulation methods in detection apparatuses result in large side lobes, causing target objects to be buried and making them undetectable.
Innovation Solution
A Continuous Transmission Frequency Modulated (CTFM) detection apparatus that includes a projector, sensor, and hardware processor, which generates a beat signal, extracts processing signals from the beat signal, and calculates complex data to select the signal with the smallest absolute value, reducing side lobes and preventing target object omission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual demodulation is applied to process echo signals, then detection capability is improved, but side lobes become large causing target objects to be buried and undetectable
Solution Approach 1:
The patent divides the beat signal processing into multiple gate intervals (first gate interval and second gate interval) and extracts multiple extracted beat signals from different segments. By segmenting the signal processing and selectively combining results from different segments, the patent reduces the impact of large side lobes that would otherwise bury target objects, while maintaining reliable detection capability.
2Ease of operation
If dual demodulation with two local signals is used, then beat signal generation is achieved, but range side lobes increase making target detection impossible
Solution Approach 1:
The patent changes the processing parameters by extracting beat signals from multiple different gate intervals and selectively choosing which extracted signal to use based on signal quality metrics. This parameter-based selection approach maintains the ease of beat signal generation while improving target detection accuracy by avoiding processed signals contaminated by large side lobes.
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
The CTFM detection apparatus effectively reduces side lobes, allowing for accurate detection of target objects by extracting processing signals asynchronously and selecting those with the smallest absolute values, thereby preventing omission in detection.
Implementation Method 1
The sensor is configured to receive a reflected wave, the reflected wave comprising a reflection of the transmission wave on a target object
Implementation Method 2
The hardware processor is programmed to at least generate a beat signal based at least in part on the transmission wave and the reflected wave
Data Source
AI summary
A Continuous Transmission Frequency Modulated (CTFM) detection apparatus is provided. The apparatus includes a projector, a sensor, and a hardware processor. The projector is configured to transmit a frequency modulated transmission wave at a given transmission period. The sensor is configured to receive a reflected wave, the reflected wave comprising a reflection of the transmission wave on a target object. The hardware processor is programmed to at least generate a beat signal based at least in part on the transmission wave and the reflected wave, extract asynchronously from the transmission period a processing signal from the beat signal, and generate information related to the target object based on the processing signal.