Ultra-broadband Coherent Radar Transponder with Fiber Optic Delay
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Solution Overview
Problem
Existing radar transponders have limited bandwidth, making them inadequate for tracking applications that require a wide frequency range, such as the S, X, and Ku microwave bands, and are unable to handle frequency chirp or hopping radar systems effectively.
Innovation Solution
An ultra-broadband coherent radar transponder with a radio frequency fiber optic delay section using single mode fiber optic cables capable of up to 18 GHz bandwidth, combined with a control logic section and microcontroller for precise delay and amplification control, allowing for phase coherence and simultaneous tracking across multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional SAW or BAW delay lines are used, then the transponder can provide coherent tracking, but the bandwidth is limited to 10 MHz or less
Solution Approach 1:
The patent replaces traditional mechanical/electrical delay lines (SAW or BAW) with an optical delay line using fiber optic cable. This substitution enables ultra-broadband operation (S, X, and Ku bands) while maintaining coherent tracking capability, resolving the contradiction between coherent tracking reliability and bandwidth adaptability
Solution Approach 2:
The patent changes the fundamental parameter of the delay line from acoustic waves (SAW/BAW) to optical waves in fiber. This parameter change allows the system to achieve bandwidth covering the entire S, X, and Ku microwave bands while preserving phase coherence for tracking applications
2Device complexity
If a single frequency transponder is used, then the device complexity is reduced, but it cannot handle frequency chirp or hopping radar systems
Solution Approach 1:
The patent creates a universal transponder design that can handle multiple radar modes (continuous wave, pulsed, frequency chirp, frequency hopping) through the use of ultra-broadband fiber optic delay line. This single design provides multi-functionality across different frequency ranges and radar types, resolving the contradiction between device simplicity and frequency agility
3Ease of operation
If the radar frequency band is confined to the transponder bandwidth, then the transponder can operate effectively, but it cannot serve diverse radar systems across S, X, and Ku bands
Solution Approach 1:
The patent introduces dynamic frequency adaptability by using an ultra-broadband fiber optic delay line that can handle frequency modulation and hopping. This allows the transponder to dynamically track and respond to radar signals across S, X, and Ku bands, resolving the contradiction between ease of operation and frequency range coverage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise range tracking and simultaneous operation across multiple frequencies, providing a single transponder solution for diverse radar systems and improving tracking accuracy by 20 times with stepped-chirp interrogation waveforms.
Implementation Method 1
a radio frequency fiber optic transmitter and a fiber optic receiver separated by a delay interval. The fiber optic cable has a length that determines the delay interval
Implementation Method 2
The fiber optic cable spool comprises single mode fiber with a bandwidth capability of up to about 18 GHz
Data Source
AI summary
An ultra-broadband coherent radar transponder for precision tracking, and in particular a transponder arrangement having an antenna, receiver, control logic, delay, and transmitter components arranged to coherently amplify, delay and repeat back a reference signal to be utilized by a microwave radar system for high fidelity tracking.