EP0063978B1 - Coupleur différentiel compact pour radar monopulse - Google Patents

Coupleur différentiel compact pour radar monopulse Download PDF

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Publication number
EP0063978B1
EP0063978B1 EP82400631A EP82400631A EP0063978B1 EP 0063978 B1 EP0063978 B1 EP 0063978B1 EP 82400631 A EP82400631 A EP 82400631A EP 82400631 A EP82400631 A EP 82400631A EP 0063978 B1 EP0063978 B1 EP 0063978B1
Authority
EP
European Patent Office
Prior art keywords
plane
coupler
branches
magic
differential coupler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82400631A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0063978A1 (fr
Inventor
Pierre Blanchard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0063978A1 publication Critical patent/EP0063978A1/fr
Application granted granted Critical
Publication of EP0063978B1 publication Critical patent/EP0063978B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port

Definitions

  • the present invention relates to a compact differential coupler for monopulse radar.
  • the angular tracking by monopulse process has been developed and consists in carrying out the angular measurements by processing each return pulse from the objective by a directivity aerial multiple.
  • an antenna formed by a parabolic reflector and two identical horns placed symmetrically with respect to the focus of the reflector.
  • Each horn is connected to a receiver. If the target is on the focal axis of the aerial, the signals received by the two receivers will be identical. On the other hand, if the target is not on the focal axis, the receivers linked to the two horns will not receive the same signals. The comparison of the signals received in each receiver must then make it possible to locate the position of the target relative to the focal axis, by means of appropriate signal processing.
  • the angles In a monopulse tracking radar, the angles must be measured in elevation and in bearing; air is therefore organized to provide a sum channel, a site difference channel and a deposit difference channel.
  • the primary monopulse source in a monopulse amplitude comparison antenna provides four signals on four guides which make it possible to carry out radar tracking, after processing these signals. Behind this primary monopulse source is placed a differential coupler consisting of four magic Tees grouped according to the diagram shown in Figure 1.
  • the source sends four waves A, B, C and D respectively on the four channels 1, 2, 3 and 4 of the coupler.
  • Channel E receives the sum of the powers of the signals collected by the four channels 1 to 4: A + B + C + D.
  • Channel AS performs the high-low difference AS: (A + B) (C + D) and the channel AG performs the right-left difference, ⁇ G: (A + C) - (B + D).
  • the emission is done by the channel s, the aerial then behaving like a single lobe aerial and the reception is done on the three channels s, AS and A G.
  • the channel E receives a signal of maximum power while the difference channels AS and AG receive nothing.
  • this signal received by the channel s is not appreciably changed, but there appears on the AS and AG channels depointing signals in elevation and / or in bearing whose power is not negligible.
  • a differential coupler consisting of magic Tees.
  • the magic tees 5, 6, 7 and 8 are produced separately and then assembled by connection guides 9 and 10 for example and junction flanges 11, 12, 13, 14.
  • a differential coupler thus produced is bulky because of the addition of the guides connecting the Tees, expensive by the large number of parts to be machined and adjusted and finally does not always have good decoupling, the symmetry of the parts and of the connections does not being not perfect, in particular because of the parasitic capacities of the edges of the junction flanges.
  • the magic tees that constitute it are grouped by a mechanic brazing process making it possible to produce relatively space-saving but expensive assemblies. At the time of soldering, a significant waste occurs and inevitably introduces deformations causing poor symmetry.
  • the present invention provides a compact differential coupler, consisting of four magic Tees and machinable by a numerically controlled machine.
  • this compact differential coupler for monopulse radar consisting of four magic Tees, comprises two metal parts symmetrical with respect to a plane assembled opposite one another along this plane of symmetry n and machined from so that their assembly constitutes the four magic Tees, two of which are of the plane fork H type, the third is of the coaxial load type and the fourth is of the plane fork type E.
  • this coupler consists of two metal parts which are symmetrical with respect to a plane and which can be machined entirely by milling machine with digital control.
  • the two metal parts constituting this coupler are assembled by screws, a metal plate being placed between the two parts in the plane of symmetry, at the level of the two magic tees of the H plane fork type.
  • FIG. 3 represents the diagram of a compact differential coupler according to the invention. It includes two magic tees 15 and 16 of the H plane fork type, a Tee 17 of the coaxial load type and a Tee 18 of the flat fork type E. Tees 15 and 16 each include two input channels 19 and 20 for Tee 15 and 21 and 22 for Tee 16 - which are usually connected to the channels of a monopulse source associated with the coupler and two output channels, one 23 or 24 leading to the two input channels of the Tee 17 with coaxial load and the other 25 or 26 directly connected to the input channels 27 and 270 of the tee fork E plane 18.
  • the tee 17 has one of its two output channels is loaded by a coaxial load 28 and its other output channel 29 provides the deposit difference channel ⁇ G of the coupler.
  • the outlet channel 30 of the flat fork tee E 18 carries out the site difference path AS of the coupler and the other channel 31 carries out the sum channel E of the coupler.
  • FIG. 4 An embodiment of such a differential coupler in compact form is shown in Figure 4. It consists mainly of two metal parts 32 and 33 symmetrical with respect to a plane x, assembled along this plane by a set of screws 34. These two parts are machined so as to produce the four magic Tees of the coupler, previously described.
  • the tracks 19 to 22 are produced by cavities dug on one of the sides of each of the two metal parts 32 and 33. Also, during their assembly to constitute the coupler, it is necessary to place between these two parts a metal plate 39 in their plane of symmetry ⁇ . At the level of the tracks to properly separate the different tracks themselves, the plate 39 has a greater thickness, allowing it to better adapt to the cavities.
  • FIG. 5 represents one of the two main components of the coupler produced according to the invention, in this case part 33.
  • the elements bearing the same references in FIGS. 4 and 5 are identical and provide the same functions.
  • the part 33 comprises two cavities hollowed out on one of its sides and which are closed by the metal plate 39, mentioned above and represented in dotted lines in the figure, thus producing the channels 20 and 22 for entry of the Tees 15 and 16. Perpendicularly at these tracks, two other cavities are dug in each of the two parts 32 and 33, producing during their assembly the tracks 23 and 24 of the tee 17 with coaxial load, of which the outlet track 29 constituting the difference track AG deposit is dug at across the entire thickness of part 33.
  • the outlet channels 25 and 26, shown diagrammatically in FIG. 3 of the Tees 15 and 16 are produced from the union of the cavities 40 and 41 dug in the extension of the tracks 20 and 22 and similar cavities dug in the other metal part 32 , symmetrically with respect to the plane ⁇ .
  • These two tracks 25 and 26 lead to the two tracks 27 and 270 of the flat tee tee E 18, the outlet track 31 of which produces the sum track s of the coupler consists of the union of a cavity 42 dug in the part 33 and d 'a cavity symmetrical with respect to the plane ⁇ dug in the part 32.
  • the site difference path AS of the coupler is produced by a cavity dug perpendicular to the plane ⁇ , through the entire thickness of the part 32, not shown in the figure.

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  • Radar Systems Or Details Thereof (AREA)
EP82400631A 1981-04-10 1982-04-06 Coupleur différentiel compact pour radar monopulse Expired EP0063978B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8107205A FR2503938A1 (fr) 1981-04-10 1981-04-10 Coupleur differentiel compact pour radar monopulse
FR8107205 1981-04-10

Publications (2)

Publication Number Publication Date
EP0063978A1 EP0063978A1 (fr) 1982-11-03
EP0063978B1 true EP0063978B1 (fr) 1986-06-11

Family

ID=9257237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400631A Expired EP0063978B1 (fr) 1981-04-10 1982-04-06 Coupleur différentiel compact pour radar monopulse

Country Status (4)

Country Link
US (1) US4553113A (enrdf_load_stackoverflow)
EP (1) EP0063978B1 (enrdf_load_stackoverflow)
DE (1) DE3271631D1 (enrdf_load_stackoverflow)
FR (1) FR2503938A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7511658B1 (en) 2008-01-16 2009-03-31 Infineon Technologies Ag High-efficiency differential radar system
ES2362761B1 (es) * 2009-04-28 2012-05-23 Ferox Comunications, S.L. Multiplexor de polarización cruzada.

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2585173A (en) * 1948-07-01 1952-02-12 Raytheon Mfg Co Radio-frequency transmission line circuit
US2759154A (en) * 1954-11-10 1956-08-14 Sperry Rand Corp Waveguide hybrid network for monopulse comparator
US2973487A (en) * 1957-06-03 1961-02-28 Hughes Aircraft Co Waveguide hybrid structure
US3274604A (en) * 1958-12-12 1966-09-20 Bernard L Lewis Multi-mode simultaneous lobing antenna
US3320553A (en) * 1961-06-29 1967-05-16 Dean D Howard Polarization diversity antenna feed system
US3281720A (en) * 1964-02-21 1966-10-25 Emerson Electric Co Waveguide hybrid junction
FR1539766A (fr) * 1967-07-13 1968-09-20 Csf Nouvelle source monopulse multimode
US3568190A (en) * 1968-07-26 1971-03-02 North American Rockwell Full monopulse variable polarization feed bridge
US3643261A (en) * 1969-10-09 1972-02-15 Itt Apparatus and method of compensating a long highly dispersive traveling wave transmission line
FR2219533B1 (enrdf_load_stackoverflow) * 1973-02-23 1977-09-02 Thomson Csf
US3999151A (en) * 1975-09-08 1976-12-21 Western Electric Company, Inc. Crossguide hybrid coupler and a commutating hybrid using same to form a channel branching network
FR2405559A1 (fr) * 1977-10-07 1979-05-04 Cit Alcatel Coupleur a guides d'ondes ramifies
DE3111731A1 (de) * 1981-03-25 1982-10-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellenuebertragungseinrichtung mit mehrmodendiversity-kombinationsempfang

Also Published As

Publication number Publication date
DE3271631D1 (en) 1986-07-17
US4553113A (en) 1985-11-12
FR2503938B1 (enrdf_load_stackoverflow) 1983-06-10
FR2503938A1 (fr) 1982-10-15
EP0063978A1 (fr) 1982-11-03

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