Microwave Signal Encoding by Feedback Difference for High Dynamic Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radar reception systems face challenges in efficiently coding high dynamic range microwave signals, requiring extensive dynamic range in analog-digital converters and leading to complex and costly systems, especially when dealing with stationary or fluctuating echoes.
Innovation Solution
A device that calculates the difference between the input signal and a return signal, digitizes this difference, and stores successive sequences to generate a return analog signal, allowing for efficient analog-digital conversion of high dynamic range signals without the need for full dynamic range encoding, using means for realizing differences, summing digitized signals, storing sequences, and generating return signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional analog-to-digital converters are used to code high dynamic range microwave signals, then the full dynamic range can be captured, but the system becomes complex and expensive
Solution Approach 1:
The patent divides the high dynamic range signal into multiple segments by separating stationary echoes from fluctuating echoes. The stationary component is coded with lower precision while the fluctuating component is coded with higher precision, allowing the system to achieve full dynamic range coverage without requiring a single high-precision converter for the entire signal
Solution Approach 2:
The patent extracts the stationary echo component from the total radar signal and processes it separately from the fluctuating echo component. This extraction allows the system to apply different coding strategies to different signal components, reducing the overall system complexity while maintaining measurement precision
2Productivity
If multiple parallel coding channels are used to increase conversion speed, then digitization speed improves, but the system becomes more cumbersome and expensive
Solution Approach 1:
The patent performs preliminary processing by separating the signal into stationary and fluctuating components before digitization. This preliminary action allows a single coding channel to handle the processed components efficiently, achieving high conversion speed without requiring multiple parallel channels
3Measurement precision
If sample-and-hold circuits are used to maintain sampled signals during conversion, then conversion accuracy improves, but the system requires high-quality components and becomes more complex
Solution Approach 1:
The patent extracts and removes the stationary echo component before the fluctuating component is digitized. This extraction reduces the dynamic range and variation in the signal that needs to be held during conversion, allowing the use of simpler sample-and-hold circuits with lower component quality requirements while maintaining coding accuracy
Data Source
Figure 1~9
Figure 2
Figure 3
AI summary
The device has a signal difference realizing unit for realizing difference (epsilont) between a radioelectric signal (St) to be converted and a feedback signal (S't), and a signal amplitude-phase detecting unit forming two baseband signals (epsilonIt, epsilonQt) in a quadrature phase. Two digitization paths comprise a signal sum realizing unit (13) to realize sum of the signals, produced by a digitization unit (12) from the baseband signals and two other signals (S'In, S'Q n), where the digitization paths deliver third signals (SIn, SQn).