G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 13/44 (2006.01) G01S 13/72 (2006.01)
Patent
CA 2214285
The process and the corresponding phase or amplitude monopulse radar device are used for position measurement of a first target (TT1) and if need be, a second target (TT2) detected by the radar beam from the direction x1, y1; x2, y2. For a first measurement axis x (e.g. azimuth), the extended monopulse antenna (HA, PA) of the radar device has at least three subantennas (A, B, .OMEGA.) that are disposed in such a way, and have directional characteristic curves of such a nature, and whose signals are combined with one another and weighted in such a way that two antenna functions FO1 (x) / Fs (x) = F1 (x) = F1p (x) + j F1q (x) , with F1p (x) or F1q (x) = 0 FO2 (x) / Fs (x) = F2 (x) = F2p (x) + j F2q (x) , with F2p (x) or F2q (x) = 0. are formed, which are linearly independent of each other, purely real or purely imaginary, and independent of target offset positions perpendicular to the first measurement axis. The function course of these antenna functions F1(x) and F2(x) is measured for the single-target case and the function values that are dependent upon the target offset position x are stored in the memory unit (MEM). Measurement values F1 ACT = F1p ACT + F1q ACT, in the two-target case with F1p ACT, and F1q ACT = 0, F2 ACT = F2p ACT + F2q ACT, in the two-target case with F2p ACT, and F2q ACT = 0 are determined according to the antenna functions F1 and F2 for the targets (TT1, TT2) of position x1 and x2 detected by the radar beam, after which a processor (PROC) takes the equation given below for the amplitude monopulse process (index A) or for the phase monopulse process (index ~) and solves it for the target directions x1 and x2 by using the stored function values: -62- For amplitude monopulse radar devices, the three subantennas (A, B, .OMEGA. or .OMEGA., C, D) that are provided for each measurement axis x;y, and whose main radiation directions are disposed in one plane, have a common phase center. For phase monopulse radar devices, the three subantennas (A, B, .OMEGA. or .OMEGA., C, D) that are provided for each measurement axis and whose main radiation directions are disposed in one plane and run parallel to one another, have phase centers that are disposed on a common line. The subantenna (.OMEGA.) which is respectively disposed in the center between the subantennas (A and B or C and D), is used as a reference element.
Ce procédé et l'appareil radar monopulsé en phase ou en amplitude correspondant servent à repérer la position d'une première cible et le cas échéant également d'une deuxième cible (TT1, TT2) détectées par le faisceau radar depuis la direction x1,y1;x2,y2. L'antenne monopulsée (HA, PA) de l'appareil radar comprend au moins trois antennes partielles (A, B, OMEGA ) pour un premier axe de mesure x (par exemple l'azimut) qui ont des caractéristiques directionnelles telles et des signaux mutuellement combinés et pondérés de façon à donner deux fonctions d'antennes linéairement indépendantes l'une de l'autre, purement réelles ou purement imaginaires et indépendantes des déplacements de la cible perpendiculairement au premier axe de mesure. La courbe de fonctionnement de ces fonctions d'antenne <u>F1</u>(x) et <u>F2</u>(x) est mesurée pour chaque cas individuel et les valeurs des fonctions dépendantes du déplacement de la cible x sont enregistrées dans une unité de mémoire (MEM). Des valeurs de mesure <u>F1</u>ACT, <u>F2</u>ACT pour les cibles (TT1, TT2) aux positions x1 et x2 détectées par le faisceau radar sont déterminées conformément aux fonctions d'antenne <u>F1</u> et <u>F2</u>.
Fetherstonhaugh & Co.
Siemens Schweiz Ag
LandOfFree
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