The application scope of the forward scatter radar(FSR)based on the Global Navigation Satellite System(GNSS)can be expanded by improving the detection capability.Firstly,the forward-scatter signal model when the targe...The application scope of the forward scatter radar(FSR)based on the Global Navigation Satellite System(GNSS)can be expanded by improving the detection capability.Firstly,the forward-scatter signal model when the target crosses the baseline is constructed.Then,the detection method of the for-ward-scatter signal based on the Rényi entropy of time-fre-quency distribution is proposed and the detection performance with different time-frequency distributions is compared.Simula-tion results show that the method based on the smooth pseudo Wigner-Ville distribution(SPWVD)can achieve the best perfor-mance.Next,combined with the geometry of FSR,the influence on detection performance of the relative distance between the target and the baseline is analyzed.Finally,the proposed method is validated by the anechoic chamber measurements and the results show that the detection ability has a 10 dB improvement compared with the common constant false alarm rate(CFAR)detection.展开更多
A new forward scattering bistatic radar motion compensation method based on spectral analysis and minimum waveform entropy is proposed. In order to demonstrate effectiveness of the presented method and ground vehicles...A new forward scattering bistatic radar motion compensation method based on spectral analysis and minimum waveform entropy is proposed. In order to demonstrate effectiveness of the presented method and ground vehicles imaging function of forward scattering radar, a simple bistatic forward scattering radar experiment system is set up on both sides of a road to collection ground vehicles experimental data. Finally, experimental ground vehicles imaging results confirm validity of the proposed motion compensation method and the experimental imaging results are identical with computer simulation results in the same parameter and condition.展开更多
Forward scattering micro radar is used for situation awareness; its operational range is relatively short because of the battery power and local horizon, the free space propagation model is not appropriate. The ground...Forward scattering micro radar is used for situation awareness; its operational range is relatively short because of the battery power and local horizon, the free space propagation model is not appropriate. The ground moving targets, such as humans, cars and tanks, have only comparable size with the transmitted signal wavelength; the point target model and the linear change of observation angle are not applicable. In this paper, the signal model of ground moving target is developed based on the case of forward scattering micro radar, considering the two-ray propagation model and area target model, and nonlinear change of observation angle as well as high order phase error. Furthermore, the analytical form of the received power from moving target has been obtained. Using the simulated forward scattering radar cross section, the received power of theoretical calculation is near to that of measured data. In addition, the simulated signal model of ground moving target is perfectly matched with the experimented data. All these results show the correctness of analytical calculation completely.展开更多
基金This work was supported by the National Natural Science Foundation of China(62071475,61890541,62171447).
文摘The application scope of the forward scatter radar(FSR)based on the Global Navigation Satellite System(GNSS)can be expanded by improving the detection capability.Firstly,the forward-scatter signal model when the target crosses the baseline is constructed.Then,the detection method of the for-ward-scatter signal based on the Rényi entropy of time-fre-quency distribution is proposed and the detection performance with different time-frequency distributions is compared.Simula-tion results show that the method based on the smooth pseudo Wigner-Ville distribution(SPWVD)can achieve the best perfor-mance.Next,combined with the geometry of FSR,the influence on detection performance of the relative distance between the target and the baseline is analyzed.Finally,the proposed method is validated by the anechoic chamber measurements and the results show that the detection ability has a 10 dB improvement compared with the common constant false alarm rate(CFAR)detection.
基金supported by the National Natural Science Foundation of China (60901068)
文摘A new forward scattering bistatic radar motion compensation method based on spectral analysis and minimum waveform entropy is proposed. In order to demonstrate effectiveness of the presented method and ground vehicles imaging function of forward scattering radar, a simple bistatic forward scattering radar experiment system is set up on both sides of a road to collection ground vehicles experimental data. Finally, experimental ground vehicles imaging results confirm validity of the proposed motion compensation method and the experimental imaging results are identical with computer simulation results in the same parameter and condition.
基金the Electro-Magnetic Remote Sensing Defence Technology Centre (EMRS DTC)established by the UK Ministry of Defence (Grant No. 1-27)+1 种基金the Program for New Century Excellent Talents in University (Grant No. NCET-06-0162)the National Natural Science Foundation of China (Grant Nos. 60890071-17, 60890072-13, 60890073)
文摘Forward scattering micro radar is used for situation awareness; its operational range is relatively short because of the battery power and local horizon, the free space propagation model is not appropriate. The ground moving targets, such as humans, cars and tanks, have only comparable size with the transmitted signal wavelength; the point target model and the linear change of observation angle are not applicable. In this paper, the signal model of ground moving target is developed based on the case of forward scattering micro radar, considering the two-ray propagation model and area target model, and nonlinear change of observation angle as well as high order phase error. Furthermore, the analytical form of the received power from moving target has been obtained. Using the simulated forward scattering radar cross section, the received power of theoretical calculation is near to that of measured data. In addition, the simulated signal model of ground moving target is perfectly matched with the experimented data. All these results show the correctness of analytical calculation completely.
