Signal Processing System for Object Property Determination
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Solution Overview
Problem
Existing signal processing systems struggle to accurately determine the properties of objects, particularly in distinguishing between a person and other objects using radio wave sensors.
Innovation Solution
A signal processing system that utilizes a radio wave sensor to receive and process sensor signals, generating differential signals based on time-shifted sensor signals to calculate differential values, which are then used to determine the properties of objects by evaluating these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radio wave sensor is used to detect object properties, then the detection capability is provided, but the accuracy in distinguishing between persons and disturbance objects is insufficient
Solution Approach 1:
The system performs preliminary actions by collecting sensor signals at multiple different timings before making a determination. The difference calculation unit generates differential signals by comparing sensor signals at reference timing with those at comparative timings, preparing evaluation values in advance that capture temporal variations in reflected radio waves, which are then used to accurately distinguish between persons and disturbance objects
Solution Approach 2:
The system utilizes dynamic characteristics of reflected radio waves by analyzing changes in sensor signals over time. The difference calculation unit computes differential values from sensor signals at different timings, capturing the dynamic behavior of reflected waves. This dynamic analysis enables the determination unit to accurately identify object properties, as persons exhibit different temporal variation patterns compared to static disturbance objects
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 system effectively determines whether an object is a person or a disturbance object, improving accuracy in object property determination by using the evaluation value derived from differential signal magnitudes.
Implementation Method 1
a radio wave sensor (1) that sends out a radio wave as a transmission wave (101) and receives, as a reception wave (102), the radio wave reflected from an object (9)
Data Source
AI summary
A signal processing system according to the present disclosure includes a difference calculation unit and a determination unit. The difference calculation unit uses a sensor signal at a reference timing and a plurality of the sensor signals at a plurality of comparative timings shifted from the reference timing. The difference calculation unit generates a plurality of differential signals as respective differences between the sensor signal at the reference timing and the plurality of the sensor signals at the plurality of comparative timings and obtains respective magnitudes of the plurality of differential signals as a plurality of differential values. The determination unit obtains an evaluation value based on the plurality of differential values and determines a property of the object by using the evaluation value.