Positioning System Using GPS Time Synchronization
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Solution Overview
Problem
Existing positioning systems, such as Multi-Static Primary Surveillance Radar, face accuracy and tracking performance issues due to reception environment and sensitivity limitations, leading to errors in position estimation.
Innovation Solution
A positioning system that incorporates a transmitter apparatus and a receiver apparatus connected via a network, utilizing GPS signals for time synchronization and Doppler frequency calculation to improve time accuracy and filter settings for enhanced pulse observation, reducing phase and time errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radar reception methods are used, then the system structure is simple, but the position estimation accuracy deteriorates due to reception environment and sensitivity limitations
Solution Approach 1:
The patent introduces a GPS receiver as an intermediary device to obtain accurate time information from GPS satellites. This external time reference serves as a mediator between the radar transmitter and receiver, enabling precise time synchronization without requiring complex internal timing systems. The GPS receiver acts as an intermediary that provides reliable time data to correct reception timing errors, thereby improving position estimation accuracy while keeping the overall system structure relatively simple.
2Measurement precision
If the receiver sensitivity is low, then the device complexity is reduced, but the observation accuracy deteriorates due to inability to correctly receive reflected waves
Solution Approach 1:
The patent implements a feedback mechanism where the received time information from GPS is fed back to the radar receiver to correct timing errors. The receiver uses the GPS time information to adjust its reception timing, creating a closed-loop system that continuously improves observation accuracy. This feedback approach allows the receiver to compensate for sensitivity limitations by using external time reference data to synchronize its reception process.
Solution Approach 2:
The patent changes the time parameter by introducing GPS-based time information to correct reception timing. Instead of relying solely on the receiver's internal clock, the system updates the time parameter using external GPS data. This parameter change enables the receiver to maintain high observation accuracy even with moderate sensitivity, as the timing corrections compensate for potential reception errors.
3Reliability
If time synchronization is not improved, then the system complexity is reduced, but the tracking performance deteriorates due to phase and time errors
Solution Approach 1:
The GPS receiver serves as an intermediary time synchronization device that bridges the transmitter and receiver systems. By obtaining time information from GPS satellites through this intermediary, the system achieves reliable time synchronization without requiring complex direct synchronization mechanisms between the radar components. The GPS receiver mediates the time synchronization process, providing accurate time data that improves tracking performance while keeping the synchronization system relatively simple.
4Measurement precision
If direct wave interference is not reduced, then the system complexity is reduced, but the pulse observation accuracy deteriorates
Solution Approach 1:
The system uses feedback from GPS time information to correct reception timing, which indirectly reduces the impact of direct wave interference. By synchronizing the receiver timing with GPS time, the system can better distinguish between direct waves and reflected waves based on their arrival times. This feedback-based timing correction creates a more accurate reception window that reduces interference from direct waves, improving pulse observation accuracy without requiring complex interference rejection algorithms.
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
The system enhances the accuracy of target position estimation and tracking performance by minimizing time and phase errors, improving pulse observation and reducing direct wave interference.
Implementation Method 1
a Doppler frequency calculator, and an arrival time difference calculator. The Doppler frequency calculator calculates a Doppler frequency based on a reception frequency of the reception signal and a transmission frequency of the radio wave
Data Source
AI summary
According to an embodiment, positioning system includes transmitter apparatus transmits radio wave and receiver apparatus receives target echo. Transmitter apparatus comprises first receiver and transmitter. First receiver receives GPS signal and outputs reference signal. Transmitter transmits radio wave at time interval based on reference signal. The receiver apparatus includes second receiver, detector and first and second calculators. Second receiver receives GPS signal and outputs time information. Detector receives target echo and outputs reception signal added received time information. First calculator calculates Doppler frequency based on reception frequency and transmission frequency. Second calculator calculates time difference of echo based on Doppler frequency. Detector sets time filter to receive next pulse based on time difference and time information of reception signal.