Signal Processing Device Propagation Delay Positioning
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Solution Overview
Problem
Existing methods for determining the position of a mobile communication terminal, such as those using electric field intensity from base stations, are prone to accuracy degradation due to multipath effects, leading to inaccurate measurement of the distance between the signal transmission and reception positions.
Innovation Solution
A signal processing device and method that transmits a radio signal at predetermined timings known to the receiving side, using global navigation satellite system (GNSS) time information to calculate propagation delay and accurately determine the distance between signal transmission and reception positions, thereby improving position estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electric field intensity information is used to determine position, then position can be estimated using base station signals, but measurement accuracy degrades due to multipath effects causing intensity changes
Solution Approach 1:
The patent changes the measurement parameter from electric field intensity to signal propagation time. By measuring the time it takes for a signal to travel from the base station to the mobile terminal and multiplying by the speed of light, the system obtains distance information that is not affected by multipath intensity variations, thus resolving the contradiction between position accuracy and measurement reliability
Solution Approach 2:
The patent replaces the electromagnetic field intensity-based measurement system with a time-based measurement system. Instead of measuring signal strength which is susceptible to environmental factors, the system measures propagation time which provides a more reliable and accurate basis for position determination
2Measurement precision
If signal transmission timing is not synchronized with receiving side, then communication flexibility is maintained, but propagation delay calculation accuracy decreases
Solution Approach 1:
The patent implements a feedback mechanism where the base station transmits reference timing information to the mobile terminal. The mobile terminal uses this feedback to synchronize its reception timing with the base station transmission timing, enabling accurate propagation delay calculation without requiring complex bidirectional synchronization protocols
Solution Approach 2:
The patent applies preliminary action by having the base station pre-transmit timing reference information before the actual measurement signal. This allows the mobile terminal to advance-prepare its reception timing, simplifying the synchronization process while ensuring accurate propagation delay 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
This approach enhances the accuracy of distance measurement and position estimation by using propagation delay calculations based on synchronized signals, reducing the impact of multipath effects and improving overall measurement precision.
Implementation Method 1
calculate a propagation delay amount of a predetermined signal on the basis of a correlation between the signal received as a radio signal and a reference signal synchronized with a transmission timing, the propagation delay amount being a delay amount from the transmission timing at which the signal is transmitted as the radio signal to a reception timing at which the signal is received
Data Source
AI summary
The disclosure relates to a signal processing device and method, and an information processing device and method, in which a distance between a position where a signal is transmitted and a position where the signal is received can be obtained with higher accuracy. A predetermined signal is transmitted as a radio signal at a predetermined timing known to a receiving side. Additionally, a propagation delay amount, which is a delay amount from a transmission timing to a reception timing of a predetermined signal received as a radio signal, is calculated on the basis of a correlation between the signal and a reference signal synchronized with the transmission timing. Furthermore, the distance between the position where a predetermined signal is transmitted and the position where the signal is received is calculated on the basis of a propagation delay amount of the signal.