Direct-to-Digital Radar Eliminates LO and Mixers
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Solution Overview
Problem
Conventional radar systems rely on complex hardware components like Local Oscillators (LO) and RF/IF Mixers, which introduce errors and prolong the engineering design cycle, limiting the goal of software-defined radio to eliminate hardware and achieve flexible reconfiguration.
Innovation Solution
A direct-to-digital software-defined radar system that eliminates the need for LO and RF/IF Mixers by using a high-speed analog-to-digital converter (ADC) for direct signal processing of RF data, enabling adaptive waveform generation and rapid system reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radar systems use LO and RF/IF Mixers for signal down-conversion, then signal processing can be performed through traditional hardware stages, but the system complexity increases and development time is prolonged
Solution Approach 1:
The patent extracts and eliminates the LO and RF/IF Mixer components from the traditional radar receiver architecture. By removing these hardware components, the system achieves direct-to-digital conversion where the receive antenna connects directly to a high-speed ADC, thereby reducing hardware complexity while maintaining signal processing capability through software-based processing in the FPGA.
Solution Approach 2:
The patent replaces the mechanical/electronic signal down-conversion process (using LO and Mixers) with a digital signal processing approach. The RF signal is directly converted to digital format by a high-speed ADC and processed using software algorithms implemented in an FPGA, substituting traditional hardware-based mixing operations with software-based correlation and processing functions.
2Manufacturing precision
If conventional radar systems use multiple amplifiers and filters for IF to baseband conversion, then signal can be properly processed, but the engineering design cycle duration increases
Solution Approach 1:
The patent removes the intermediate frequency stage and its associated amplifiers and filters from the signal processing chain. By eliminating these hardware components, the system directly converts RF signals to digital format using a high-speed ADC, thereby reducing the engineering design cycle time while maintaining signal processing precision through software-based filtering and processing algorithms.
Solution Approach 2:
The patent changes the fundamental parameter of signal conversion from analog domain (using amplifiers and filters) to digital domain (using high-speed ADC and software processing). This parameter change enables faster development cycles as software algorithms can be rapidly modified and reconfigured without hardware changes, while maintaining processing precision through sophisticated digital signal processing techniques.
3Device complexity
If direct conversion technique is used to bypass IF stage, then hardware complexity is reduced, but errors are introduced by LO and mixer hardware
Solution Approach 1:
The patent extracts and eliminates the LO and Mixer hardware components that introduce errors in traditional direct conversion systems. By removing these problematic components and implementing a direct-to-digital architecture where the receive antenna connects directly to a high-speed ADC, the system achieves both reduced hardware complexity and improved signal processing accuracy by eliminating the error sources associated with LO and mixer hardware.
Solution Approach 2:
The patent replaces the error-prone analog mixing process with a direct digital conversion approach. Instead of using LO and Mixers that introduce spurs and rejection issues, the system uses a high-speed ADC to directly convert RF signals to digital format, followed by software-based processing in an FPGA. This substitution eliminates hardware-induced errors while maintaining processing capability through software algorithms.
Data Source
AI summary
A direct-to-digital software defined radar system includes a high-speed digitizer coupled directly to a receive antenna and outputs a digital signal to a processor which receives the digitized signal, along with an arbitrarily-defined reference signal provided by signal generator, and indexes the signal data according to time and geo-location, arranges the data according to a three-dimensional data structure, declutters and filters and refines the data for storage or display.