Satellite Signal Interference Rejection via Digital Sample Delay
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Solution Overview
Problem
Communication signals are often degraded by interference, such as jamming signals, which hinder the accuracy of signal reception in satellite navigation systems.
Innovation Solution
A method and apparatus that convert composite satellite signals to digital form, generate an interference estimate using a first group of samples, and combine it with a second group of samples to remove interference, independent of the code chip rate of the desired signal, while retaining undistorted chip edge characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional interference removal methods are used, then interference signal is reduced, but desired signal distortion occurs and chip edge characteristics are degraded
Solution Approach 1:
The patent segments the received signal into interference component and desired signal component by using multiple delay lines to create different signal paths. By processing samples through multiple delay elements and combining them with different weights, the system separates interference removal from desired signal preservation, allowing independent optimization of each function.
Solution Approach 2:
The patent changes the parameter of sample grouping by organizing received samples into multiple groups with different delay characteristics. By adjusting the delay line lengths and combining coefficients, the system dynamically adapts to different interference conditions while maintaining chip edge integrity, making the interference removal independent of code chip rate.
2Measurement precision
If interference removal processing is applied, then signal accuracy improves, but processing complexity increases
Solution Approach 1:
The patent performs preliminary action by pre-processing the received signal through multiple delay lines before interference removal. The delay lines are configured in advance to create specific phase relationships between signal components, enabling simpler subsequent processing steps that can efficiently remove interference without requiring complex real-time calculations.
3Object-affected harmful factors
If code chip rate adaptive processing is used, then interference removal effectiveness improves, but processing time increases
Solution Approach 1:
The patent achieves universality by designing a delay line configuration that works independently of the code chip rate. The same delay line structure and combining coefficients can be applied across different satellite navigation systems and chip rates, making the interference removal processor versatile and eliminating the need for rate-specific processing that would increase processing time.
Data Source
AI summary
Methods and apparatus are disclosed for ameliorating signal reception. An example method disclosed herein includes receiving a composite satellite signal comprising a desired signal component and an interference signal component, converting the received composite satellite signal to a digital received composite signal, receiving a first group of samples from the digital received composite signal, generating an interference estimate of the interference signal component based on the first group of samples, combining the interference estimate and a second sample belonging to a second group of samples to remove, partially or entirely, the interference signal component from the composite satellite signal, the first group of samples received prior to the sample belonging to the second group of samples, wherein the removal is generally independent of the code chip rate of the desired signal component and substantially retains the undistorted chip edge characteristics of the desired signal component.