In-Vehicle Positioning via Stepwise Pulse Pattern Signals
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Solution Overview
Problem
Existing onboard apparatus control systems face challenges in accurately determining the position of a portable apparatus within a vehicle in a timely manner due to interference between radio waves transmitted from multiple antennae, leading to prolonged positioning times.
Innovation Solution
The system employs multiple transmitting antennae with different transmission frequencies and pulse-pattern-signal units that transmit radio waves with intensities changing stepwise according to unique patterns at overlapping timings, allowing the portable apparatus to receive and determine its position based on combined pulse pattern signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio waves are transmitted sequentially from multiple transmitting antennae by shifting transmission time, then interference between radio waves is avoided, but the time taken to determine the position of the portable apparatus increases
Solution Approach 1:
The patent applies periodic action by transmitting pulse pattern signals from multiple transmitting antennae simultaneously at overlapping timings. Each antenna transmits radio waves with intensities changed stepwise according to mutually-different patterns, creating periodic signal variations that can be distinguished by the portable apparatus through pattern recognition, thereby enabling simultaneous transmission without interference
Solution Approach 2:
The patent changes the intensity parameter of radio waves transmitted from multiple antennae according to mutually-different stepwise patterns. By varying the intensity parameter in distinct patterns from each antenna, the system enables the portable apparatus to identify and combine signals from different antennae simultaneously, resolving the contradiction between simultaneous transmission and signal distinguishability
2Productivity
If radio waves are transmitted concurrently from multiple transmitting antennae, then the time taken to determine position is reduced, but interference occurs making it difficult for the portable apparatus to receive respective radio waves
Solution Approach 1:
The patent uses periodic action by transmitting pulse pattern signals with intensities changed stepwise according to mutually-different patterns from multiple antennae simultaneously. The periodic intensity variations create distinctive temporal patterns that allow the portable apparatus to separate and identify signals from different antennae, enabling concurrent transmission without harmful interference
Solution Approach 2:
The patent applies parameter changes by varying the intensity parameter of radio waves from each antenna according to unique stepwise patterns. This parameter modulation allows the portable apparatus to distinguish between simultaneous signals from different antennae, eliminating interference while maintaining high transmission speed
Data Source
AI summary
An onboard apparatus control system is disclosed. The onboard apparatus control system includes a portable apparatus and an in-vehicle apparatus which controls an onboard apparatus according to position of the portable apparatus. From multiple transmitting antennae, the in-vehicle apparatus transmits pulse pattern signals with different transmission frequencies at an overlapping timing, so that the pulse pattern signals are radio waves whose intensities are changed stepwise according to different patterns. The portable apparatus receives the radio waves transmitted from the multiple transmitting antennae. The position of the portable apparatus with respect to the vehicle is determined based on a combined pattern of the received pulse pattern signals, which a receiving unit is to receive at location with respect to the vehicle.