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1. (WO1998053338) METHOD FOR IMPROVING MONOPULSE PROCESSING OF APERTURE SEGMENT OUTPUTS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/053338 International Application No.: PCT/US1998/008188
Publication Date: 26.11.1998 International Filing Date: 22.04.1998
Chapter 2 Demand Filed: 04.12.1998
IPC:
G01S 13/44 (2006.01)
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
13
Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
02
Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
06
Systems determining position data of a target
42
Simultaneous measurement of distance and other coordinates
44
Monopulse radar, i.e. simultaneous lobing
Applicants:
RAYTHEON COMPANY [US/US]; 141 Spring Street Lexington, MA 02421, US
Inventors:
PRIEBE, leslie, A.; US
HOLMES, Jerry, D.; US
Agent:
MILLS, Jerry, W.; Baker & Botts, L.L.P. 2001 Ross Avenue Dallas, TX 75201-2980, US
Priority Data:
60/047,51423.05.1997US
Title (EN) METHOD FOR IMPROVING MONOPULSE PROCESSING OF APERTURE SEGMENT OUTPUTS
(FR) PROCEDE PERMETTANT D'AMELIORER LE TRAITEMENT MONOPULSE DES SORTIES DES SEGMENTS D'OUVERTURE
Abstract:
(EN) A system and method for estimating azimuth angle, elevation angle and signal detection and which includes an antenna system having a plurality of elements, each element receiving a different concurrent portion of an incoming analog signal having a real and an imaginary portion. A converter is provided for each antenna element for converting each analog signal to digital form. A processor is provided for multiplying the sum of the real parts of the signal from a first group of the elements with the conjugate of the sum of the remainder of the elements to provide an estimated azimuth, elevation of signal detection measurement. In the case of a four element antenna, AzEst = Angle ((A+B)*(C+D)Conjugate) = (xA + iyA + xB + iy8) * (xC - iyC + xD - iyD), ElEst = Angle ((A+D) * (B+C) Conjugate) = (xA + iyA + xD + iyD) * (xB - iyB + xC - iyC) and Magnitude (A+B*(C+D)Conjugate) or Magnitude (A+D*(B+C)Conjugate). When the antenna system includes four antenna quadrants A, B, C and D, false detections due to responses coming from the sidelobe regions are suppressed by subtracting the offset of OffsetAz = ScaleFactor*Magnitude(DeltaAz), where the Offset is a scale factor to make the numbers come out correctly to provide a synthetic beam response: SyntheticAz = Magnitude((A+B)*(C+D)Conjugate) - OffsetAz the processor further including a comparator for comparing the Synthetic Az to a threshold to determine validity of the signal.
(FR) Un système et un procédé permettant d'estimer l'angle d'azimut, l'angle d'élévation et la détection de signal et qui inclut un système d'antenne comportant une pluralité d'éléments, chaque élément recevant une partie concourante différente d'un signal analogique entrant caractérisé par une partie réelle et d'une partie imaginaire. Un convertisseur équipant chaque élément d'antenne permet de convertir chacun des signaux analogiques en signaux numériques. Un processeur permet de multiplier la somme des parties réelles du signal d'un premier groupe des éléments par la conjugaison (Conjugate) de la somme du reste des éléments de façon à obtenir une mesure estimée de détection de l'azimut et de l'élévation du signal. Dans le cas d'une antenne à quatre éléments, on a: AzEst = Angle((A+B) * (C+D)Conjugate)) = (xA + iyA + xB + iy8) * (xC - iyC + xD - iYD), ainsi que: ElEst = Angle ((A+D) * (B+C) Conjugate)) = (xA + iyA + xD + iyD)) * (xB - iyB + xC - iyC) et Magnitude ((A+B*(C+D)Conjugate)) ou Magnitude ((A+D*(B+C)Conjugate)). Dans le cas d'un système d'antenne comportant les quatre quadrants A, B, C et D, les fausses détections imputables à des réponses provenant des régions des lobes latéraux se suppriment en soustrayant le décalage OffsetAz = ScaleFactor*Magnitude(DeltaAz). Dans ce cas, le décalage est un facteur scalaire tel que les nombres viennent correctement de façon à fournir une réponse de faisceau de synthèse donnant $i(SyntheticAZ) = Magnitude((A+B)*(C+D)Conjugate) - OffsetAz. Le processeur comporte également un comparateur permettant de comparer SyntheticAZ à un seuil de détermination de la validité du signal.
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Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP1012623AU1998071517