TY - GEN
T1 - A new algorithm about transforming from near-field to far-field of radar target scattering
AU - Nanjing, Li
AU - Chufeng, Hu
AU - Ying, Li
AU - Linxi, Zhang
PY - 2008
Y1 - 2008
N2 - In order to meet the approximate plane-wave irradiating condition, adequate large field or compact range system is needed for RCS measurement of large aircraft targets. However, an outside testing field site or a compact range system is very expensive, so a new RCS extrapolation method named Hankel algorithm based on near-distance testing has been presented. According to the fact that objective reflectivity spatial distribution is unchanged with measurement state in ISAR imaging, here the multi-scattering center model is built. Then, the height of stealth target is always short, and the far-field condition can easily be satisfied on vertical plane, so the incident spherical wave is equivalent to cylindrical wave. Once more, the relationship between far-field and near-field is deduced by regarding image of the target as secondary radiating source. Finally, the RCS of target can be obtained with the scattering information of near-field extrapolated at full angular aspect. Taking derivative of the near-field data with respect to frequency in algorithm, the error can be reduced in simplifying formula, and just meet the requirement of stepped-frequency system. The results of simulation and experiments show that the algorithm is precise as well as effective.
AB - In order to meet the approximate plane-wave irradiating condition, adequate large field or compact range system is needed for RCS measurement of large aircraft targets. However, an outside testing field site or a compact range system is very expensive, so a new RCS extrapolation method named Hankel algorithm based on near-distance testing has been presented. According to the fact that objective reflectivity spatial distribution is unchanged with measurement state in ISAR imaging, here the multi-scattering center model is built. Then, the height of stealth target is always short, and the far-field condition can easily be satisfied on vertical plane, so the incident spherical wave is equivalent to cylindrical wave. Once more, the relationship between far-field and near-field is deduced by regarding image of the target as secondary radiating source. Finally, the RCS of target can be obtained with the scattering information of near-field extrapolated at full angular aspect. Taking derivative of the near-field data with respect to frequency in algorithm, the error can be reduced in simplifying formula, and just meet the requirement of stepped-frequency system. The results of simulation and experiments show that the algorithm is precise as well as effective.
UR - https://www.scopus.com/pages/publications/63549111907
U2 - 10.1109/ISAPE.2008.4735300
DO - 10.1109/ISAPE.2008.4735300
M3 - 会议稿件
AN - SCOPUS:63549111907
SN - 9781424421923
T3 - ISAPE 2008 - The 8th International Symposium on Antennas, Propagation and EM Theory Proceedings
SP - 661
EP - 663
BT - ISAPE 2008 - The 8th International Symposium on Antennas, Propagation and EM Theory Proceedings
T2 - 8th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2008
Y2 - 2 November 2008 through 5 November 2008
ER -