公开(公告)号：US5309161A

公开(公告)日：1994-05-03

申请号：US988706

申请日：1992-12-10

申请人： Harry Urkowitz ,  John J. Gallagher ,  Jerald D. Nespor ,  Sheldon L. Katz

发明人： Harry Urkowitz ,  John J. Gallagher ,  Jerald D. Nespor ,  Sheldon L. Katz

IPC分类号： G01S13/28 ,  G01S13/526

CPC分类号： G01S13/288 ,  G01S13/526

摘要： A radar system includes a doppler/pulse compressor/range sidelobe suppressor filter bank (40), which separates received echo signals according to their frequency spectrum into doppler channels, and within each doppler channel performs pulse compression for reducing the duration of the received signals, and also performs range sidelobe suppression, for improving range resolution. It may be advantageous to perform certain types of processing in the time domain, such as determination of spectral moments for estimating velocity spread, mean closing velocity, and reflectivity of a diffuse target such as a weather phenomenon. An inverse (frequency-to-time) transform (50) is performed on the signals produced by the doppler/pulse compressor/range sidelobe suppressor filter bank (40), to produce a reconstructed version of the received signals. In these reconstructed signals, the pulses are compressed, and range sidelobes are reduced. The time-domain processing (62) is performed on the reconstructed signals. In a particular embodiment of the invention, the range sidelobe suppression and pulse compression filters (34a, 34b . . . ) follow the doppler filters (32), but any ordering of the filters may be used. Interchannel frequency interference attributable to the non-zero bandwidth of the Doppler filters may be reduced by pulse-to-pulse time weighting (30) applied to the received signals over a time window corresponding to a particular dwell, together with inverse weighting (62) following the inverse transformation.

摘要翻译： 雷达系统包括多普勒/脉冲压缩器/范围旁瓣抑制滤波器组（40），其将接收到的回波信号根据其频谱分离成多普勒通道，并且在每个多普勒通道内执行脉冲压缩以减少接收信号的持续时间， 并且还执行范围旁瓣抑制，以提高范围分辨率。 在时域中执行某些类型的处理可能是有利的，例如确定用于估计速度扩展的频谱力矩，平均关闭速度以及诸如天气现象的漫射目标的反射率。 对由多普勒/脉冲压缩器/范围旁瓣抑制滤波器组（40）产生的信号执行反向（频率 - 时间）变换（50），以产生接收信号的重构版本。 在这些重建信号中，脉冲被压缩，并且范围旁瓣减少。 对重构信号进行时域处理（62）。 在本发明的特定实施例中，范围旁瓣抑制和脉冲压缩滤波器（34a，34b ...）跟随多普勒滤波器（32），但是可以使用滤波器的任何排序。 归因于多普勒滤波器的非零带宽的通道间频率干扰可以通过在对应于特定驻留的时间窗口上应用于接收信号的脉冲到脉冲时间加权（30）以及反加权（62）来减小， 跟随逆变换。