GPS Arrival Angle Selecting System for Interference Mitigation
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Solution Overview
Problem
Conventional GPS arrival angle estimation algorithms face challenges in accurately determining the arrival angle due to low GPS signal power compared to noise and interference levels, leading to incorrect estimation that includes interference angles.
Innovation Solution
A GPS arrival angle selecting system and method that compares pre-despreading and post-despreading arrival angles to isolate the accurate GPS signal arrival angle, enhancing the system's performance in high-interference environments by using a combination of arrival angle estimating units and a despreading unit to differentiate between GPS and interference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional arrival angle estimation algorithms (MUSIC, ESPRIT) are used to estimate GPS arrival angle, then the algorithm provides superior arrival angle estimation performance, but the estimated arrival angle includes both GPS arrival angle and interference arrival angle because GPS electric power remains far lower than interference or noise power level
Solution Approach 1:
The patent segments the arrival angle estimation process into two distinct stages: pre-despreading estimation and post-despreading estimation. By dividing the estimation process and comparing results from both stages, the system can identify and select the accurate GPS arrival angle while excluding interference angles, thus resolving the contradiction between estimation performance and accuracy.
Solution Approach 2:
The system uses feedback by comparing the pre-despreading arrival angle with the post-despreading arrival angle. This comparison mechanism allows the system to verify the accuracy of the estimated arrival angle and select the correct GPS arrival angle, thereby improving reliability while maintaining estimation performance.
2Power
If arrival angle is estimated after despreading, then the GPS signal power is sufficient for estimation, but the estimated arrival angle includes both GPS arrival angle and interference arrival angle
Solution Approach 1:
The patent performs preliminary arrival angle estimation before despreading occurs. This pre-despreading estimation provides a reference value that can be compared with the post-despreading estimation result, enabling the system to identify the true GPS arrival angle and exclude interference angles.
Solution Approach 2:
By comparing the pre-despreading arrival angle with the post-despreading arrival angle, the system uses feedback to verify which estimated angle corresponds to the actual GPS signal. This feedback mechanism ensures accurate arrival angle selection even when multiple angles are present.
Data Source
AI summary
Disclosed is a GPS arrival angle selecting system. The system includes: a arrival angle estimating unit connected to a receiving antenna of a GPS receiver including at least one antenna array element and configured to decide a first arrival angle of a signal received prior to despreading and a second arrival angle of a signal received after despreading; and an arrival angle selecting unit configured to select a different peak value by comparing the first arrival angle and the second arrival angle. Also disclosed is a GPS arrival angle selecting method.