GNSS and Wireless LAN Signal Reception via Time-Sharing
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Solution Overview
Problem
Existing GNSS receivers face challenges in receiving signals indoors due to weak signal strength and require additional wireless LAN receiving functions, leading to increased cost and size.
Innovation Solution
A receiving device with a first unit for GNSS signals, a second unit for wireless LAN signals, a selecting unit, a converting unit, and a control unit that processes both signals in a time-sharing manner, using local oscillation signals to convert signals into intermediate frequency, allowing for cost-effective and compact reception of both types of signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a receiver includes both GNSS receiving functions and wireless LAN receiving functions, then both GNSS signals and wireless LAN signals can be received, but cost and mounting area increase
Solution Approach 1:
The patent combines the GNSS receiving function and wireless LAN receiving function into a single integrated receiver. The selecting unit switches between GNSS signals and wireless LAN signals, allowing one receiver to perform both functions. This merging approach reduces the need for separate receiving devices, thereby lowering cost and mounting area while maintaining the ability to receive both signal types.
Solution Approach 2:
The receiver is designed with multi-functionality to handle both GNSS signals and wireless LAN signals through a single device. By incorporating a selecting unit that can switch between different signal sources, the receiver becomes a universal device capable of performing multiple receiving tasks, thus avoiding the need for separate specialized receivers and reducing overall system complexity and cost.
2Reliability
If GNSS receiver sensitivity is increased to receive weak indoor signals, then signal reception capability improves, but positioning error increases due to signal quality degradation
Solution Approach 1:
The patent introduces wireless LAN signals as an intermediary positioning method for indoor environments where GNSS signals are too weak to provide accurate positioning. When GNSS positioning accuracy degrades indoors, the system switches to using wireless LAN access point MAC addresses for positioning. This intermediary approach maintains reliable positioning capability in indoor scenarios without requiring excessive amplification of weak GNSS signals that would compromise accuracy.
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 simultaneous and efficient reception of GNSS and wireless LAN signals at a lower cost and in a more compact form, facilitating indoor positioning by utilizing wireless LAN signals as a complementary method to GNSS.
Implementation Method 1
By multiplying the signal selected in the selecting unit by a local oscillation signal generated in a local oscillation circuit, the converting unit converts the selected signal into an IF signal with lower intermediate frequency
Data Source
AI summary
The present disclosure relates to a receiving device and a receiving method that can receive both signals of a GNSS signal and a wireless LAN at lower cost and more compactly. A selecting unit selects either a received GNSS signal or wireless LAN signal. By multiplying the signal selected in the selecting unit by a local oscillation signal generated in a local oscillation circuit, a converting unit converts the selected signal into an IF signal with lower intermediate frequency. A control unit controls the selecting unit, and performs control so that the GNSS signal and the wireless LAN signal are processed in a time-sharing manner in the converting unit. The technology of the present disclosure can be applied to a receiving device that receives a signal from a GPS satellite, for example.