Doppler Frequency Broadening Compensation for Maneuvering Small Target Based on Time-frequency Ridge Extraction
In order to increase the signal to noise ratio(SNR)of the radar echo signal so as to detect the small target,a long-time coherent integration is performed as an important signal processing step.However,the integration performance of high-speed ma-neuvering targets may be greatly influenced by the range migration and Doppler frequency broadening(DFB).To address the DFB problem,a DFB compensation method based on time-frequency ridge(TFR)extraction is proposed in this paper.The acceleration is then obtained according to the mathematic relation between the slope of the extracted TFR and the acceleration.The shortcom-ings of traditional search methods,such as low computational efficiency,the requirement for prior information on the search range,and accuracy influenced by the search step size,are overcome by the proposed method.Rapid and accurate acceleration estimation is enabled also under low SNR conditions without prior acceleration information,thus resolving the DBF issue and achieving effec-tive inter-pulse coherent accumulation.The proposed method is demonstrated through simulation experiments to rapidly and accu-rately estimate the target's acceleration under low SNR conditions without any prior information,thereby effectively achieving accu-rate compensation and detection of maneuvering small targets based on the pulse compression signal.
maneuvering small target detectiontime-frequency ridge(TFR)extractioncoherent integrationDoppler frequency broadening(DFB)
万方数据
维普
