Receiver Circuitry for Asynchronous Multi-Direction Motion Detection
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Solution Overview
Problem
Current short-range radar systems that use Doppler signals for velocity detection are limited to velocity measurement in a single direction and require synchronous operation of the transmitter and receiver, which restricts their ability to detect motion in multiple directions or gestures.
Innovation Solution
The use of channel impulse response (CIR) signals, processed by receiver processing circuitry, to detect motion by calculating the average sum of reflected pattern samples over a predetermined time window and comparing it to a threshold value, allowing for asynchronous operation and detection of moving objects in various directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Doppler signals are used for velocity detection, then velocity measurement capability is improved, but the system is limited to single-direction detection and requires synchronous operation
Solution Approach 1:
The patent changes the fundamental detection parameter from Doppler frequency (velocity-dependent) to channel impulse response magnitude (position-dependent). This allows the system to detect motion by monitoring changes in signal strength over time rather than relying on frequency shifts, thereby enabling multi-directional detection without requiring synchronous transmitter-receiver operation
Solution Approach 2:
The patent replaces the mechanical synchronization requirement between transmitter and receiver with an asynchronous operation mode. By using channel impulse response analysis, the system can detect motion without requiring the transmitter and receiver to be synchronized, thus improving operational flexibility and reducing system complexity
2Measurement precision
If synchronous operation of transmitter and receiver is implemented, then velocity detection accuracy is improved, but system complexity and operational constraints increase
Solution Approach 1:
The patent eliminates the mechanical synchronization mechanism by using channel impulse response analysis. The receiver processes reflected signals independently without requiring time synchronization with the transmitter, replacing the complex synchronization system with a simpler asynchronous processing approach that maintains detection accuracy
3Measurement precision
If traditional Doppler-based radar is used, then velocity measurement in one direction is achieved, but detection of multi-directional motion and gestures is limited
Solution Approach 1:
The patent adds a temporal dimension to the detection process by monitoring channel impulse response changes over time. This allows the system to detect not only velocity but also acceleration, direction changes, and gestures by analyzing how the reflected signal characteristics evolve over time, thereby expanding detection capabilities beyond single-direction velocity measurement
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
Enables the detection of moving objects in multiple directions and gestures without the need for synchronous operation, expanding the radar system's capabilities beyond traditional Doppler-based velocity measurement.
Implementation Method 1
determine a sum of channel impulse response values over a predetermined time window responsive to the reflected predetermined pattern samples; and determine whether a moving object is sensed responsive to the determined sum of the channel impulse response values and a predetermined threshold value
Implementation Method 2
a reflected predetermined pattern signal responsive to the predetermined pattern signal provided by the transmitter antenna
Data Source
AI summary
Motion detection apparatuses are disclosed. The motion detection may be performed using one or more of a sub-window of a predetermined time window, a predetermined threshold value that is settable responsive to changes in one or more environmental factors, or a detection trigger. An apparatus includes a processor and an analog-to-digital converter (ADC) circuitry to sample a reflected predetermined pattern signal to generate reflected predetermined pattern samples. The processor captures collections of the reflected predetermined pattern samples corresponding to a predetermined time window and determines a sum of the collections or sub-collections. The processor determines an average of magnitudes of the determined sum and determines that a moving object is detected responsive to a predetermined threshold value.