In-band Pseudolite Positioning for Indoor Accuracy
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Solution Overview
Problem
Current GPS and wireless sensor network positioning methods face challenges in indoor environments due to signal attenuation, limiting their accuracy and coverage, and require additional systems to process signals from both navigation satellites and pseudolites.
Innovation Solution
A wireless positioning system using in-band pseudolites, where a base station transmits identifier information and correction data to pseudolites, which generate random positioning signals, allowing terminals to determine their position by matching received signals with generated sequences, thereby improving accuracy without increasing downlink signal interference and using the same wireless bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS positioning is used in indoor environments, then positioning function can be provided, but positioning accuracy deteriorates due to serious signal attenuation
Solution Approach 1:
The patent combines GPS satellite positioning with pseudolite positioning into an integrated system. The terminal can receive and process signals from both GPS satellites and pseudolites simultaneously, merging multiple positioning sources to maintain functionality indoors while improving accuracy through signal fusion and selection.
2Area of stationary object
If pseudolites are deployed to improve indoor positioning coverage, then signal strength and coverage are improved, but device complexity increases due to additional wireless system requirements
Solution Approach 1:
The pseudolite system is designed to be multi-functional: it can operate independently for indoor positioning when GPS is unavailable, and can also work in conjunction with GPS satellites when both are available. The terminal's positioning module is universally capable of processing signals from either source or both simultaneously, reducing the need for separate dedicated systems.
3Measurement precision
If both GPS satellites and pseudolites are used for positioning, then positioning accuracy is improved, but signal interference increases requiring additional processing
Solution Approach 1:
The patent implements dynamic signal selection and processing strategies. The terminal's positioning module dynamically adjusts which signals to process based on availability and quality - it can select only pseudolite signals when GPS is blocked, only GPS signals when available, or combine both when necessary. This dynamic adaptation minimizes interference while maintaining accuracy.
4Adaptability or versatility
If separate wireless systems are used for GPS and pseudolite positioning, then positioning functionality is provided, but bandwidth requirements and signal interference increase
Solution Approach 1:
The patent merges GPS and pseudolite operations into a unified positioning framework that shares common resources including signal processing chains, positioning algorithms, and communication protocols. This consolidation allows both satellite and pseudolite signals to be processed through the same terminal hardware and software, reducing overall bandwidth consumption and eliminating the need for separate dedicated systems.
Data Source
AI summary
An in-band pseudolite wireless positioning method, system and device are provided. The system has a base station, a pseudolite and a terminal. The base station transmits identifier information to the pseudolite after correcting a transmission clock of the pseudolite and transmits a pseudolite array and positioning correction information to the terminal. The pseudolite generates a random positioning signal sequence according to the identifier information and transmits a positioning signal according to the transmission clock and the random positioning signal sequence. The terminal generates a random positioning signal sequence of the pseudolite according to the pseudolite array and the positioning correction information. The terminal further matches the received positioning signal according to the random positioning signal sequence to obtain the arrival time of the positioning signal and obtain through calculation the position coordinates of the terminal according to the position coordinates of the pseudolite and the arrival time.