Mobile Reception Terminal Delay Profiles for Reflective Object Positioning

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Solution Overview

Problem

Existing methods for estimating water vapor using digital terrestrial broadcasting require fixed locations for the broadcast station, reception terminal, and reflective objects, limiting the area in which water vapor can be measured, and cannot identify the position of reflective objects when the reception terminal is mobile.

Innovation Solution

A mobile reception terminal creates a delay profile of direct and reflected radio waves, transmitting this profile to a server over a network, allowing the server to calculate the position of reflective objects and estimate water vapor using delay profiles from multiple terminals with known positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the reception terminal is placed in a vehicle to enable mobile measurement, then the measurement area can be expanded, but the positional relationship between the reflective object, reception terminal, and broadcast station becomes unfixed, making it impossible to identify the reflective object position

Engineering Contradiction:

Improvemeasurement areaVSAvoidposition identification accuracy

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent introduces a server as an intermediary that receives delay profile information from mobile reception terminals and performs centralized processing. The server calculates the position of reflective objects by combining delay profile data from multiple terminals with their known positions, enabling position identification even when individual terminals are mobile. This mediator approach allows mobile measurement while maintaining position identification capability through collaborative processing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system divides the water vapor measurement task into multiple segments by using multiple mobile reception terminals at different positions. Each terminal independently measures delay profiles, and the server aggregates these segmented measurements to calculate reflective object positions and water vapor amounts. This segmentation enables expanded measurement coverage while maintaining accuracy through data fusion.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If fixed locations are used for broadcast station, reception terminal, and reflective object, then the position of reflective objects can be identified, but the measurement area is limited

Engineering Contradiction:

Improveposition identification accuracyVSAvoidmeasurement area

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The patent transforms the static measurement system into a dynamic one by allowing reception terminals to move (e.g., in vehicles) while maintaining the broadcast station at a fixed location. The system dynamically adapts by using the known positions of multiple mobile terminals to calculate reflective object positions through server-based processing of delay profiles from different locations, thus expanding measurement area while preserving position identification accuracy.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback by using the known positions of reception terminals as reference information that is fed back into the calculation process. The server uses this position feedback along with delay profile measurements to accurately determine reflective object positions, enabling the system to adapt to mobile terminal locations while maintaining measurement precision.

Inventive Principle:

Principle #23Feedback

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 identification of reflective object positions and estimation of water vapor even when the reception terminal is mobile, by utilizing a network-connected server to process delay profiles from multiple terminals with known positions.

Implementation Method 1

receiving a direct wave and a reflected wave of radio waves transmitted by a transmission station

Methodology Applied

Scientific EffectRadio wave propagation: Electromagnetic Induction

Implementation Method 2

reflected wave of radio waves transmitted by a transmission station that has a fixed position

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

creating a delay profile of reception of the direct wave and the reflected wave, the delay profile indicating a time difference between the direct wave and the reflected wave

Methodology Applied

Scientific EffectTime difference of arrival: Time of Flight

Data Source

PatentUS20250224500A1Information transmission method, information processing method, and mobile reception terminal

Publication Date: 2025.07.10 SOCIONEXT INC

AI summary

An information transmission method of a mobile reception terminal that is capable of connecting to a server over a network and capable of receiving a direct wave and a reflected wave of radio waves transmitted by a transmission station that has a fixed position and transmits radio waves of a same modulation scheme continuously or periodically, includes: creating a delay profile of reception of the direct wave and the reflected wave that indicates a time difference between the direct wave and the reflected wave; and transmitting the delay profile to the server over the network.