Pseudo GNSS Signal Distribution Through Leakage Cables in Shaded Areas
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Solution Overview
Problem
Existing global navigation satellite systems (GNSS) face challenges in providing accurate location information in areas with obstructed line of sight, such as indoors or underground, leading to reduced quality of navigation services.
Innovation Solution
A system that generates and outputs pseudo GNSS signals using a signal generating apparatus, leakage cables, and signal output apparatuses to provide GNSS signals in shaded areas, utilizing IQ phase data and frequency shift correction to maintain continuous positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GNSS signals are transmitted in obstructed environments (indoor/underground), then location information can be provided, but signal reception is impossible due to lack of line of sight with satellites
Solution Approach 1:
The patent introduces a pseudo GNSS signal generation system as an intermediary that creates artificial satellite signals. This intermediary system includes a signal generating apparatus that receives actual GNSS signals and generates pseudo signals, along with leakage cables that distribute these pseudo signals throughout the obstructed environment, enabling location services without direct satellite access
Solution Approach 2:
The system creates copies of actual GNSS satellite signals by generating pseudo GNSS signals that replicate the characteristics of real satellite transmissions. These copied signals are then transmitted through leakage cables to provide location information in areas where the original satellite signals cannot reach directly
2Duration of action of moving object
If a pseudo GNSS signal is generated from actual GNSS signal, then signal continuity is maintained, but Doppler shift causes frequency deviation
Solution Approach 1:
The signal generating apparatus continuously receives actual GNSS signals and uses this feedback to generate updated pseudo GNSS signals. The system monitors the actual signal characteristics and adjusts the pseudo signal generation accordingly, ensuring that frequency deviations caused by Doppler shift are compensated and signal continuity is maintained
Solution Approach 2:
The system dynamically adjusts the frequency parameters of the pseudo GNSS signals based on the characteristics of the actual received signals. By changing the frequency parameters to match the actual satellite signal conditions, the system maintains measurement precision while preserving signal continuity during transitions
3Measurement precision
If multiple satellite signals are processed, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The patent divides the signal processing into separate functional modules: a signal receiving module that captures actual GNSS signals, a pseudo signal generation module that creates pseudo signals for multiple satellites, and a signal output module that distributes these signals. This segmentation allows the system to handle multiple satellite signals systematically while managing complexity through modular architecture
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 continuous GNSS signal reception and accurate location determination in obstructed environments without modifying client apparatuses, ensuring reliable navigation services.
Implementation Method 1
Each of the plurality of leakage cables may include a plurality of leakage slots repeatedly arranged at certain intervals in an outer conductor of a coaxial cable
Data Source
AI summary
A global navigation satellite system (GNSS) signal output system is proposed. The system may include a signal generating apparatus configured to receive GNSS navigation information and generate, based on the GNSS navigation information, a pseudo GNSS signal corresponding to a current time and a current location. The system may also include a plurality of leakage cables including a plurality of signal leakage slots. The system may further include a plurality of signal output apparatuses configured to receive the pseudo GNSS signal from the signal generating apparatus and output the pseudo GNSS signal to at least one of the plurality of leakage cables. The plurality of signal output apparatuses may be arranged apart from each other.