Process for side lobe suppression and amplitude or phase monopul

Details Process for side lobe suppression and amplitude or phase monopul Process for side lobe suppression and amplitude or phase monopul

1999-03-08

2000-09-12

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Determining direction

Monopulse

342152, 342194, 342140, G01S 1342

Patent

active

061184020

ABSTRACT:
The process is used for suppressing the effect of signals that are received or sent via side lobes of an antenna (PA; HA) of an amplitude or phase monopulse radar device, in which for the purpose of position measurement of a first and, if need be, a second target (T1, T2) detected by the radar beam, three illumination functions Je(Lx), Jk(Lx) and Js(Lx) for the antenna (PA; HA) are provided for each measurement axis, as well as antenna functions Fe(X), Fk(X), and Fs(X) resulting from them. The first, second, and third illumination functions Je(Lx); Jk(Lx), and Js(Lx) are selected in this connection so that a quotient function Qe(X)=Fe(X)/Fs(X) or Qk(X)=Fk(X)/Fs(X), which is linearly or quadratically dependent on the target direction, is produced by normalizing the first and the second antenna functions Fe(X); Fk(X) with the third antenna function Fs(X). The power of this quotient is compared with at least one threshold value th.sub.e or th.sub.k that is selected in accordance with the magnitude of the main antenna lobe, and when the threshold value th.sub.e or th.sub.k is exceeded, the effect of the received signal is suppressed. In a preferred embodiment of the invention, the provision is made that the zero points of the antenna functions Fe(X), Fk(X), and Fs(X) are shifted slightly in relation to one another.

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