Signal Detector Look-Ahead Using Dual Decimation Channels
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Solution Overview
Problem
Radar systems face challenges in simultaneously achieving rapid response times and detecting signals at low power levels, necessitating a balance between latency and signal-to-noise ratio (SNR) that existing technologies often fail to address effectively.
Innovation Solution
A dual-channel approach is implemented, with a reduced latency channel using a lower decimation rate and a high SNR channel using a higher decimation rate, allowing for early detection threshold generation in the reduced latency channel to support rapid response, while the high SNR channel provides improved SNR performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a higher decimation rate is applied to improve SNR, then signal detection sensitivity is improved, but latency increases
Solution Approach 1:
The patent divides the signal processing system into two separate channels: a first channel for reduced latency processing and a second channel for high SNR processing. This segmentation allows each channel to be optimized for its specific function, resolving the contradiction between latency and SNR by treating them as separate performance requirements rather than competing constraints.
Solution Approach 2:
Each processing channel is configured with different decimation rates and filter characteristics tailored to its specific function. The first channel uses lower decimation for reduced latency, while the second channel uses higher decimation for improved SNR. This local optimization allows each part of the system to achieve its performance goals without compromising the other.
2Loss of time
If a lower decimation rate is applied to reduce latency, then response time is improved, but SNR deteriorates
Solution Approach 1:
The system separates signal processing into two independent channels with different decimation rates. The first channel applies lower decimation for rapid response, while the second channel applies higher decimation for improved SNR. This segmentation eliminates the need to choose between the two competing requirements.
Solution Approach 2:
Each channel is locally optimized with appropriate decimation and filtering parameters. The first channel uses parameters optimized for speed, while the second channel uses parameters optimized for signal quality, allowing both performance characteristics to coexist in the overall system.
3Speed
If a wider decimation filter is applied to reduce latency, then processing speed is improved, but SNR performance worsens
Solution Approach 1:
The patent implements separate processing paths where the first channel uses wider filters for faster processing and the second channel uses narrower filters for better SNR. This segmentation allows the system to achieve both high processing speed and high SNR performance simultaneously by distributing different filter characteristics across dedicated channels.
Solution Approach 2:
Each channel is configured with filter characteristics matched to its functional requirements. The first channel employs wider filters optimized for speed, while the second channel employs narrower filters optimized for SNR, allowing both performance goals to be achieved without compromise.
Data Source
AI summary
Techniques are provided for reduced latency look-ahead for signal detection. An example methodology implementing the techniques according to an embodiment includes down converting a digitized signal to a first baseband signal at a first decimation rate such that the first baseband signal is provided at a first latency with a first signal to noise ratio (SNR) based on the first decimation rate. The method also includes down converting the digitized signal to a second baseband signal at a second decimation rate, greater than the first decimation rate, such that the second baseband signal is provided at a second latency with a second SNR based on the second decimation rate, the second latency greater than the first latency and the second SNR greater than the first SNR. The method continues with generating a detection threshold based on the first baseband signal prior to completion of the second baseband signal generation.