Dual-Sweep Signal Generator for Target Extraction
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Solution Overview
Problem
Existing techniques for target extraction using chirp waves face accuracy issues due to overlapping frequencies in heterodyne processing, which complicates target speed estimation and Doppler influence detection.
Innovation Solution
An information processing apparatus that generates a dual-sweep signal with a frequency band not overlapping the chirp wave, allowing for accurate target extraction by multiplying the reception wave signal with the dual-sweep signal to produce a beat frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional heterodyne signal with overlapping frequency band is used, then the processing is simple, but the target extraction accuracy deteriorates due to frequency overlap
Solution Approach 1:
The patent divides the frequency spectrum into distinct non-overlapping bands: the chirp wave occupies one frequency band while the heterodyne signal occupies a separate frequency band. This segmentation prevents frequency overlap between the transmitted chirp wave and the heterodyne signal, allowing clear separation of target-related frequencies from other frequencies in the heterodyne processing result, thereby improving target extraction accuracy without significantly increasing system complexity
Solution Approach 2:
The patent changes the frequency parameter of the heterodyne signal (dual-sweep signal) to ensure its frequency band does not overlap with the chirp wave frequency band. By adjusting the frequency parameters of the dual-sweep signal generation, the system achieves non-overlapping frequency bands while maintaining the heterodyne processing function, thus resolving the contradiction between measurement precision and device complexity
2Loss of information
If frequency overlap occurs in heterodyne processing, then all frequencies are captured, but target identification becomes difficult due to mixed frequencies
Solution Approach 1:
The patent segments the frequency information by ensuring the heterodyne signal's frequency band is separate from the chirp wave's frequency band. This segmentation causes the heterodyne processing result to contain distinct frequency components: beat frequencies related to target distance and velocity, and other frequencies unrelated to targets. The non-overlapping bands enable clear separation and identification of target-related frequency information, preventing loss of information and improving target identification accuracy
3Measurement precision
If the heterodyne signal frequency overlaps with chirp wave frequency, then the processing is straightforward, but Doppler influence detection accuracy deteriorates
Solution Approach 1:
The patent applies frequency band segmentation by designing the dual-sweep heterodyne signal to operate in a frequency band that does not overlap with the chirp wave band. This segmentation isolates the Doppler-related beat frequencies from other frequency components in the heterodyne processing result, enabling accurate detection and analysis of Doppler influences without requiring complex signal separation techniques, thus improving measurement precision while maintaining reasonable device complexity
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 target extraction accuracy by separating necessary frequencies from unnecessary ones, facilitating effective target identification and Doppler correction.
Implementation Method 1
a wave receiver that receives a reflected wave of a chirp wave reflected from a target
Implementation Method 2
a heterodyne processor that generates a beat frequency by multiplying the reception wave signal and the dual-sweep signal as a heterodyne signal
Implementation Method 3
generating a beat frequency as the frequency difference between the heterodyne signal and the reception wave signal
Implementation Method 4
a dual-sweep signal generator that generates a dual-sweep signal of the chirp wave, having a frequency which does not overlap a frequency band of the chirp wave
Data Source
AI summary
To acquire a beat frequency necessary for target extraction, target speed estimation, and Doppler influence detection by preventing the necessary beat frequency from overlapping unnecessary frequencies in a heterodyne processing result, an apparatus includes a wave receiver that receives a reflected wave of a chirp wave reflected from a target, and outputs a reception wave signal, a dual-sweep signal generator that generates a dual-sweep signal of the chirp wave, having a frequency which does not overlap that of the chirp wave, and a heterodyne processor that generates a beat frequency by multiplying the reception wave signal and the dual-sweep signal as a heterodyne signal.