| 摘要 |
The present invention relates to a method of improving data obtained by radar by interpolation over frequency bands jammed by narrow-band interference, at which the following steps (A)-(J) are carried out. (A) it is determined what frequency values are affected by narrow-band interference. (B) Every radar return which is continuously connected in time and represented by a timediscrete real or complex signal f(ti), containing N sample, i=1,2,...,N, is Fourier-transformed into a frequency-discrete function F(.omega.i), given by N sample. (C) A series of integers N1, N2,...,NM is fixed, such that 1N1N2...NMN. (D) The signal processing device sets Fk(.omega.i)=F(.omega.i) outside narrow-band interference and Fk(.omega.i)=Hk(.omega.i) within intervals having narrow-band interference. (E) H1(.omega.i) is equated to 0 and Hk(.omega.i) for k2 is constructed according to the following steps (F) (H). (F) Fk-1(.omega.i) is inversely Fourier-transformed into a time-discrete function fk-1(ti). (G) The signal processing device sets hk(ti)=fk-1(ti) for i=1,2,...,Nk-1, wherein /Vfk-1(ti)/V constitute the Nk-1 greatest values of /Vfk1(ti)/V and hk(ti)=0 for the remaining N-Nk-1 values of the function. (H) hk(ti) is Fourier-transformed into a frequency-discrete function Hk(.omega.i). (I) Steps (D)-(H) are repeated M times, wherein 1kM. (J) FNM(.omega.i) is inversely Fourier-transformed to give the finally filtered radar return fNM(ti).
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