Signal Processing Device for Speed-Selective Object Detection
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Solution Overview
Problem
Existing signal processing techniques struggle to detect objects with speeds equal to or smaller than a certain speed, including still objects, as they are not designed to avoid detecting such objects, which can be undesirable in certain applications.
Innovation Solution
A signal processing device and method that utilize at least two cross correlation calculation units to calculate cross correlation functions between a reflection signal and different correlation waveforms, synthesizing these functions in a way that makes it difficult to detect objects in a predetermined speed range, specifically including still objects, by generating cross ambiguity functions with gaps at zero doppler shift, thereby omitting detection of objects at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cross correlation techniques are used to detect all objects, then detection coverage includes still objects and low-speed objects, but this causes unwanted detection of objects in speed ranges that should be excluded
Solution Approach 1:
The patent divides the detection task into multiple segments by using at least two different correlation waveforms, each optimized for different speed ranges. By segmenting the cross correlation calculation into multiple parallel processing paths with different waveforms, the system can selectively enhance detection for desired speed ranges while suppressing detection for excluded speed ranges, thus resolving the contradiction between comprehensive coverage and selective exclusion.
Solution Approach 2:
The patent changes the parameters of the correlation waveforms used in cross correlation calculation. By using at least two different correlation waveforms with different characteristics (such as different frequency modulations or time delays), the system can adjust the detection sensitivity for different speed ranges. This parameter change allows the system to suppress detection of objects in excluded speed ranges while maintaining detection capability for objects in desired ranges.
2Adaptability or versatility
If multiple cross correlation calculations with different waveforms are performed, then detection selectivity for specific speed ranges improves, but processing complexity increases
Solution Approach 1:
The patent merges multiple cross correlation calculation results into a single synthesized detection output. By combining the results from at least two different correlation waveforms through synthesis (such as summation or weighted combination), the system achieves speed range selectivity without requiring completely separate detection systems. This merging approach reduces processing complexity compared to implementing multiple independent detection systems while still achieving the desired selectivity.
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 solution effectively prevents the detection of objects in a predetermined speed range, including still objects, allowing for simplified processing and focusing on detecting objects outside this range, which is beneficial for applications where still objects or low-speed objects are not of interest.
Implementation Method 1
at least two cross correlation calculation means that each calculate a cross correlation function between a waveform of a reflection signal acquired when a transmission signal having changing frequencies is reflected by a target object and a different correlation waveform generated from a waveform of the transmission signal
Implementation Method 2
synthesizing these functions in a way that makes it difficult to detect objects in a predetermined speed range, specifically including still objects, by generating cross ambiguity functions with gaps at zero doppler shift
Data Source
AI summary
In order to achieve object detection that does not detect an object moving at a speed within a prescribed speed range, the present invention comprises at least two cross-correlation calculation units which each calculate a cross correlation function between a waveform of a reflection signal obtained when a transmission signal having changing frequencies is reflected by a target object, and a different correlation waveform generated from the waveform of the transmission signal, and a synthesis unit that synthesizes at least two cross-correlation functions from at least the two cross-correlation calculation units so as to make detection of a target object moving at a speed within the prescribed speed range less likely, and that outputs the synthesis results to a post-processing unit.