Single Antenna Mobile Body Measurement Using Doppler Correlation
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Solution Overview
Problem
Conventional methods for measuring the movement direction and velocity of a mobile body require multiple antennas, increasing installation costs and equipment size.
Innovation Solution
A mobile body measurement device and method using a single directional antenna that transmits and receives electromagnetic waves, employing a Doppler sensor, signal intensity distribution data generation, and velocity and direction computation units to determine movement direction and velocity based on correlation between previously measured velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple receivers (antennas) are installed to measure movement direction and velocity, then measurement capability is improved, but installation costs and equipment size increase
Solution Approach 1:
The patent combines the functions of multiple antennas into a single antenna by integrating signal transmission and reception capabilities. The single antenna transmits electromagnetic waves and receives reflected waves, merging what would traditionally require separate transmitting and receiving antennas into one multifunctional component, thereby reducing the total number of antennas needed while maintaining measurement capability
Solution Approach 2:
The single antenna in the patent serves multiple functions: it acts as both a transmitting antenna and a receiving antenna, and through signal processing it enables measurement of both movement velocity and movement direction. This multi-functionality allows one antenna to replace what would traditionally require multiple specialized antennas, reducing system complexity while preserving measurement capabilities
2Measurement precision
If multiple receivers (antennas) are installed to measure movement direction and velocity, then measurement capability is improved, but installation costs increase
Solution Approach 1:
The patent merges multiple antenna functions into a single antenna system, reducing the total component count. This consolidation directly reduces installation costs by requiring fewer physical installations, less calibration work, and simplified system integration, while the advanced signal processing compensates for the reduced hardware quantity to maintain measurement precision
Solution Approach 2:
The patent introduces signal processing techniques as an intermediary that compensates for using fewer physical antennas. Through sophisticated algorithms that analyze the electromagnetic wave signals, the system achieves accurate movement direction and velocity measurements without requiring multiple expensive antenna installations, thus reducing overall system cost while maintaining measurement capability
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 measurement of movement direction and velocity using a single antenna, reducing costs and equipment size while maintaining accuracy.
Implementation Method 1
a Doppler sensor that supplies the transmission signal to the antenna and generates a Doppler signal having a Doppler frequency on the basis of the reception signal supplied by the antenna
Data Source
AI summary
A single antenna has directionality, transmits a transmission wave toward a golf ball on the basis of a supplied transmission signal, receives a reflected wave that is reflected off the golf ball, and generates a reception signal. A Doppler sensor generates as time series data a Doppler signal having a Doppler frequency. A measurement processing unit calculates a movement direction of a mobile body on the basis of the correlation between the movement direction of the mobile body and the differential between the velocity of a mobile body for a reference time measurement obtained in advance and the velocity of the mobile body after a prescribed amount of time has elapsed from the reference time.