Radar Cross-Section Measurement with Time-Gated Pulse Deconvolution
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Solution Overview
Problem
Measuring the radar cross section of low radar-signature targets is increasingly difficult due to radio frequency interference (RFI) from other transmitters, and using larger amplifiers and higher power signals can cause unwanted disruptions.
Innovation Solution
Employing time-gating and post-processing techniques to 'walk' radar pulses along a test range, using radar systems and software to measure targets with low RFI levels, avoiding the need for expensive amplifiers and higher power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a larger amplifier and higher power signal are used to increase the signal-to-noise ratio for measuring low radar-signature targets, then the measurement precision is improved, but the radio frequency interference to other transmissions increases
Solution Approach 1:
The patent uses periodic radar pulses with specific timing patterns to measure targets. By transmitting pulses at controlled intervals and using time-gating to measure returns at specific delay times, the system achieves adequate signal-to-noise ratio without requiring continuous high-power transmission, thereby reducing RF interference to other systems.
Solution Approach 2:
The patent changes the timing parameters of radar pulses (delay times between pulses and delay times before measurement) to optimize the measurement process. By varying these temporal parameters, the system can accumulate measurement data over time while using lower peak power, improving signal-to-noise ratio without proportionally increasing RF interference.
2Measurement precision
If conventional frequency sweeping is used to acquire radar cross section profiles, then measurement completeness is improved, but exposure to radio frequency interference increases
Solution Approach 1:
Instead of continuous frequency sweeping, the patent uses periodic pulses at a single frequency (or narrow frequency range) with varying delay times. This periodic pulsed approach maintains measurement capability while significantly reducing the time the transmitter is active, thereby reducing RF interference exposure.
Solution Approach 2:
The patent transitions from the frequency domain (sweeping through different frequencies) to the time domain (varying delay times of pulses). By measuring targets at different ranges using time-gating with pulses at a single frequency, the system achieves comparable measurement information while avoiding the continuous high-power transmission required for frequency sweeping.
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
Effectively mitigates RFI interference while accurately determining radar cross sections without the use of large amplifiers and higher power transmission, facilitating precise target assessment and radar system performance evaluation.
Implementation Method 1
transmitting one or more radar pulses to the object... measuring a pulse return, the pulse return being the radar pulse reflected by the object
Data Source
AI summary
Provided is a method and system for measuring a radar cross section of an object (102). The method comprises: transmitting one or more radar pulses (402) to the object (102), each of the one or more pulses (402) having a predetermined pulse profile; for each of the one or more pulses (402), measuring a pulse return, the pulse return being the radar pulse (402) reflected by the object (102); deconvolving the measured one or more pulse returns using the predetermined pulse profile; and determining the radar cross section of the object (102) using the deconvolved one or more pulse returns.


