3D Tone-Hopping Signal Acquisition With Anti-Jam Frequency Excision
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Solution Overview
Problem
Existing technologies face challenges in accurately acquiring and processing satellite signals with noise and Doppler frequency shifts, particularly from low Earth orbit satellites, due to noise, jamming, and high acceleration, which complicates signal detection and acquisition, especially in environments with high noise and interference, where existing signal acquisition techniques require large and time-consuming brute force searches, which are computationally expensive and less precise.
Innovation Solution
A signal acquisition device with a signal channelizer module and a frequency excisor module that channels and stores the incoming signal into multiple channels and frequency, using a tunable Hilbert transformer and FFT processor to process the signal, and a frequency excision module to remove jammed portions of the incoming signal, and a signal processing module to exclude and process the signal of interest, and a frequency excision module to discard unusable channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brute force search is used to acquire satellite signals, then signal detection coverage is improved, but processing time and computational cost increase significantly
Solution Approach 1:
The patent divides the frequency spectrum into multiple channels using a channelizer, processing signals in segmented frequency portions rather than the entire spectrum at once. This segmentation reduces the search space for each processing stage while maintaining comprehensive coverage through multiple parallel channels.
Solution Approach 2:
The patent performs preliminary frequency domain analysis using FFT to identify and excise jammed frequency portions before the main signal acquisition process. This preliminary action removes harmful interference early, reducing the computational burden during subsequent signal search operations.
2Reliability
If frequency excision is applied to remove jammed portions, then signal quality is improved, but processing complexity increases
Solution Approach 1:
The patent extracts and removes jammed frequency portions from the signal using frequency excision techniques. By identifying and taking out only the harmful frequency components rather than processing the entire signal, the system improves signal quality while limiting the impact on overall processing complexity.
Solution Approach 2:
The patent dynamically adjusts processing parameters based on detected signal conditions, including adapting the excision threshold and modifying channelizer operation. This parameter adaptation allows the system to maintain optimal performance across varying interference conditions without requiring fixed complex processing for all scenarios.
3Productivity
If multiple channels are processed in parallel, then processing speed is improved, but memory requirements increase
Solution Approach 1:
The patent segments the frequency spectrum into multiple channels that are processed in parallel, increasing processing speed through concurrent operations. The channelizer divides the input signal into distinct frequency portions, enabling parallel processing while managing memory through structured organization of channel data.
Solution Approach 2:
The patent implements a hierarchical channelization structure where channels are organized in nested groups, allowing efficient memory management. The channelizer creates a nested arrangement of frequency portions that can be processed in parallel while sharing memory resources, reducing overall memory requirements compared to flat parallel processing architectures.
Data Source
AI summary
A signal acquisition device includes a signal channelizer module and a signal processing module. The signal channelizer module is configured to channelize an incoming signal from a moving platform into a first plurality of channels across a first range of frequencies to produce a first channelized signal, to channelize the first channelized signal into a second plurality of channels across a second range of frequencies to produce a second channelized signal, and to store the second channelized signal into a memory. The signal processing module is configured to retrieve the second channelized signal from the memory and search the second channelized signal for a signal of interest. The search may exclude channels tagged to be excised during the storing operation.