发明名称 |
Method of extracting phase errors caused by the atmosphere in the backscatter signal of a coherent imaging radar system carried by a carrier from radar raw data and apparatus for carrying out the method |
摘要 |
In a method of extracting phase errors caused by the atmosphere in the backscatter signal of an on-board coherent imaging radar system from radar raw data, firstly to image areas with different backscatter ratios over a predetermined period of time consecutive azimuth spectra are continuously formed. Thereupon, a frequency offset ( DELTA F(t)) of the backscatter ratio component is obtained by determining the location of the maximum of the correlations between two respective immediately consecutively formed azimuth spectra. Then, a double integration for the difference of the frequency offset ( DELTA F(t)) and a desired value ( DELTA Fsoll) of the frequency offset is carried out, the frequency offset desired value ( DELTA Fsoll) being determined either from the carrier forward velocity (Vv) or by a low-pass filtering of the frequency offset ( DELTA F(t)), and finally for standardization the result of the double integration is multiplied by a constant (2 pi / DELTA t) to obtain thereby the phase error ( phi e(t)).
|
申请公布号 |
US5257028(A) |
申请公布日期 |
1993.10.26 |
申请号 |
US19920910589 |
申请日期 |
1992.07.08 |
申请人 |
DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHRT E.V. |
发明人 |
KEYDEL, WOLFGANG;MOREIRA NETO, JOAO R. |
分类号 |
G01S13/89;G01S13/90;(IPC1-7):G01S13/90 |
主分类号 |
G01S13/89 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|