CA2829633C - Space borne antenna system - Google Patents
Space borne antenna system Download PDFInfo
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- CA2829633C CA2829633C CA2829633A CA2829633A CA2829633C CA 2829633 C CA2829633 C CA 2829633C CA 2829633 A CA2829633 A CA 2829633A CA 2829633 A CA2829633 A CA 2829633A CA 2829633 C CA2829633 C CA 2829633C
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- antenna
- boom
- platform
- radiating element
- feed arrangement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
- H01Q1/1228—Supports; Mounting means for fastening a rigid aerial element on a boom
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/288—Satellite antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/104—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using a substantially flat reflector for deflecting the radiated beam, e.g. periscopic antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
- H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
- H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/2658—Phased-array fed focussing structure
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention provides a space borne antenna system, that comprises a platform (10), at least one feed arrangement and at least one radiating element (40; 40a, 40b; 40b-1, 40b-2). The plafform (10) comprises at least one boom (20; 20-1, 20-2). The feed arrangement is arranged on or close to the plafform (10) wherein the feed arrangement comprises at least one reflecting element. The at least one radiating element (40; 40a, 40b; 40b-1, 40b-2) is mounted at the tip of the at least one boom which is remote to the plafform (10), wherein the at least one radiating element (40; 40a, 40b; 40b-1, 40b-2) is adapted to receive electromagnetic waves from the feed arrangement and to redirect it in a different direction and/or vice versa.
Description
Space borne antenna system The invention relates to a space borne antenna system. In particular, the invention relates to a multiple antenna system for space borne applications like radar, syn-thetic aperture radar (SAR), interferometric SAR or moving target indication (MTI).
Known antenna systems, for example an interferometric SAR instrument, often comprise two or more radiating apertures (i.e. antenna arrangements) which are mounted on a single platform, e.g. a spacecraft or a satellite, with a certain spatial sensor separation. A large separation, i.e. baseline, between the radiating aper-tures is reached by mounting at least one of the antennas on the tip of a boom like structure. The boom like structure (e.g. arm or mast) may be fixed or deployable.
According to the partly high weight of the antenna mounted at the tip of the boom, the boom has to be adapted to have a sufficient, predetermined stiffness. How-ever, this may result in a heavy and mechanically complex boom. Furthermore, the distance between platform and antenna may influence the performance of the an-tenna system.
It is therefore an object of the present invention to provide a space borne antenna system which is structural and/or functional improved.
This object is solved by an antenna system according to the features of claim 1.
Preferred embodiments are set out in the dependent claims.
The invention provides a space borne antenna system that comprises a platform, at least one feed arrangement and at least one radiating element. The platform comprises at least one boom. The platform may be, for example, a satellite or a spacecraft. The feed arrangement is arranged on or close to the platform, wherein the feed arrangement comprises at least one reflecting element. The at least one radiating element is mounted at the tip of the at least one boom which is remote to
Known antenna systems, for example an interferometric SAR instrument, often comprise two or more radiating apertures (i.e. antenna arrangements) which are mounted on a single platform, e.g. a spacecraft or a satellite, with a certain spatial sensor separation. A large separation, i.e. baseline, between the radiating aper-tures is reached by mounting at least one of the antennas on the tip of a boom like structure. The boom like structure (e.g. arm or mast) may be fixed or deployable.
According to the partly high weight of the antenna mounted at the tip of the boom, the boom has to be adapted to have a sufficient, predetermined stiffness. How-ever, this may result in a heavy and mechanically complex boom. Furthermore, the distance between platform and antenna may influence the performance of the an-tenna system.
It is therefore an object of the present invention to provide a space borne antenna system which is structural and/or functional improved.
This object is solved by an antenna system according to the features of claim 1.
Preferred embodiments are set out in the dependent claims.
The invention provides a space borne antenna system that comprises a platform, at least one feed arrangement and at least one radiating element. The platform comprises at least one boom. The platform may be, for example, a satellite or a spacecraft. The feed arrangement is arranged on or close to the platform, wherein the feed arrangement comprises at least one reflecting element. The at least one radiating element is mounted at the tip of the at least one boom which is remote to
2 the platform, wherein the at least one radiating element is adapted to receive elec-tromagnetic waves from the feed arrangement and to redirect it in a different direc-tion and/or vice versa.
The invention is based on the consideration that separation of the feed arrange-ment and the radiation element enables a more performing antenna system. The reason for the better performance is the fact that no cables between the platform and the tip of the boom have to be installed. In known antenna systems, for the exchange of control commandos or RE signals between the platform and an an-= =
tenna being arranged on the tip of the boom, the signals have to be routed along the boom by cables or waveguides which is complex. RF signal quality suffers from losses due to cable or waveguide length. Furthermore, in contrast to the known antenna systems, no calibration effort and thermal control of the antennas remote from the platform is necessary.
In the antenna system according to the invention, the at least one radiating ele-ment may be adapted to receive electromagnetic waves from the feed arrange-ment and to redirect them in a different direction. Hence this antenna arrangement represents a transmit (Tx) antenna. Alternatively, the at least one radiating ele-ment may be adapted to receive electromagnetic waves and to redirect them in a different direction to the feed arrangement. In this case the antenna arrangement is adapted to be a receive (Rx) antenna. Furthermore, the at least one radiating element may be adapted to receive electromagnetic waves from the feed ar-rangement and to redirect them in a different direction and to receive electromag-netic waves from the different direction and to redirect them to the feed arrange-ment. Hence, this antenna arrangement represents a receive and transmit (Rx/Tx) antenna.
According to a further embodiment, the radiating element can comprise a flat re-flector, such as a reflecting plane, or a reflector or a reflect-array. In these embod-
The invention is based on the consideration that separation of the feed arrange-ment and the radiation element enables a more performing antenna system. The reason for the better performance is the fact that no cables between the platform and the tip of the boom have to be installed. In known antenna systems, for the exchange of control commandos or RE signals between the platform and an an-= =
tenna being arranged on the tip of the boom, the signals have to be routed along the boom by cables or waveguides which is complex. RF signal quality suffers from losses due to cable or waveguide length. Furthermore, in contrast to the known antenna systems, no calibration effort and thermal control of the antennas remote from the platform is necessary.
In the antenna system according to the invention, the at least one radiating ele-ment may be adapted to receive electromagnetic waves from the feed arrange-ment and to redirect them in a different direction. Hence this antenna arrangement represents a transmit (Tx) antenna. Alternatively, the at least one radiating ele-ment may be adapted to receive electromagnetic waves and to redirect them in a different direction to the feed arrangement. In this case the antenna arrangement is adapted to be a receive (Rx) antenna. Furthermore, the at least one radiating element may be adapted to receive electromagnetic waves from the feed ar-rangement and to redirect them in a different direction and to receive electromag-netic waves from the different direction and to redirect them to the feed arrange-ment. Hence, this antenna arrangement represents a receive and transmit (Rx/Tx) antenna.
According to a further embodiment, the radiating element can comprise a flat re-flector, such as a reflecting plane, or a reflector or a reflect-array. In these embod-
3 iments, the radiating elements are passive elements having a predetermined shape and reflecting properties according to a desired signal beam deflection.
According to a further embodiment, the feed arrangement comprises at least one secondary antenna comprising at least one reflector antenna or reflect-array an-tenna or antenna elements.
According to a further embodiment, the feed arrangement comprises at least one secondary antenna system, comprising a feed system and one or more reflectors or one and more reflect-arrays. The feed system may comprise one or more an-tenna elements.
In other words, according to this invention the feed arrangement is realized as fo-cusing secondary antenna for the radiating element. It may comprise of at least one ore more reflector antennas or reflect-array antennas. Likewise, the feed ar-rangement may comprise at least one reflector antenna system, comprising or consisting of at least one or more feed elements and a one ore more reflectors.
The feed arrangement may alternatively comprise at least one reflect-array anten-na system, comprising or consisting of one or more feed elements and one or more reflect-arrays. Hence, electromagnetic waves may be deflected by or within the feed arrangement. In such an antenna system, multiple antenna elements in the feed system may be used for beam squint in any direction. Likewise, one or more secondary antennas may be used for beam squint in any direction.
An example for the secondary antenna with more than one reflector comprises a cassegrain like secondary (hyperbolic) reflector which is illuminated with at least one focusing (parabolic) ternary reflector which is illuminated by a feed system with one or more antenna elements.
The at least one boom may be a fixed or a deployable or extractable structure (e.g. a mast or telescopic arm) with arbitrary shape and configuration. The shape
According to a further embodiment, the feed arrangement comprises at least one secondary antenna comprising at least one reflector antenna or reflect-array an-tenna or antenna elements.
According to a further embodiment, the feed arrangement comprises at least one secondary antenna system, comprising a feed system and one or more reflectors or one and more reflect-arrays. The feed system may comprise one or more an-tenna elements.
In other words, according to this invention the feed arrangement is realized as fo-cusing secondary antenna for the radiating element. It may comprise of at least one ore more reflector antennas or reflect-array antennas. Likewise, the feed ar-rangement may comprise at least one reflector antenna system, comprising or consisting of at least one or more feed elements and a one ore more reflectors.
The feed arrangement may alternatively comprise at least one reflect-array anten-na system, comprising or consisting of one or more feed elements and one or more reflect-arrays. Hence, electromagnetic waves may be deflected by or within the feed arrangement. In such an antenna system, multiple antenna elements in the feed system may be used for beam squint in any direction. Likewise, one or more secondary antennas may be used for beam squint in any direction.
An example for the secondary antenna with more than one reflector comprises a cassegrain like secondary (hyperbolic) reflector which is illuminated with at least one focusing (parabolic) ternary reflector which is illuminated by a feed system with one or more antenna elements.
The at least one boom may be a fixed or a deployable or extractable structure (e.g. a mast or telescopic arm) with arbitrary shape and configuration. The shape
4 and the configuration of the boom may be arbitrary, since it is not essential for the current invention as long as there is a baseline, i.e. distance, between the feed arrangement and a corresponding radiating element.
According to a further embodiment, a further antenna or antenna system (in other words: an antenna arrangement) may be arranged on or close to the platform, wherein the antenna or antenna system is adapted for reception and/or transmis-sion of electromagnetic waves. As a result, the antenna system according to the invention may comprise more than one antenna arrangements. For example, the antenna arranged on or close to the platform may be used as a receive antenna, while the at least one antenna arrangement which has a respective radiating ele-ment mounted at the tip of the at least one boom is/are transmit antenna(s).
In case of two (or more) such transmit antennas, the antenna system may be used as an interferometric SAR antenna system.
An advantage of the antenna system according to the invention is that the radiat-ing elements can be realized passive, i.e. no RE signals need to be routed along the boom(s) being connected to the platform. The weight of the passive radiating element at the end of the boom is low. This approach avoids laying RE
waveguides along the deployable boom, and minimizes calibration efforts and electrical losses in these waveguides.
A further advantage of the proposed antenna system is that the feed system and its assigned electronics are mounted in close vicinity of the platform or directly into the platform where they are under tight thermal control.
The principle advantage is that the proposed feed system allows architectures with very long boom (boom length >> diameter of reflecting element at tip of boom) as the secondary antenna illuminates the radiating element.
According to a further embodiment, a further antenna or antenna system (in other words: an antenna arrangement) may be arranged on or close to the platform, wherein the antenna or antenna system is adapted for reception and/or transmis-sion of electromagnetic waves. As a result, the antenna system according to the invention may comprise more than one antenna arrangements. For example, the antenna arranged on or close to the platform may be used as a receive antenna, while the at least one antenna arrangement which has a respective radiating ele-ment mounted at the tip of the at least one boom is/are transmit antenna(s).
In case of two (or more) such transmit antennas, the antenna system may be used as an interferometric SAR antenna system.
An advantage of the antenna system according to the invention is that the radiat-ing elements can be realized passive, i.e. no RE signals need to be routed along the boom(s) being connected to the platform. The weight of the passive radiating element at the end of the boom is low. This approach avoids laying RE
waveguides along the deployable boom, and minimizes calibration efforts and electrical losses in these waveguides.
A further advantage of the proposed antenna system is that the feed system and its assigned electronics are mounted in close vicinity of the platform or directly into the platform where they are under tight thermal control.
The principle advantage is that the proposed feed system allows architectures with very long boom (boom length >> diameter of reflecting element at tip of boom) as the secondary antenna illuminates the radiating element.
5 All described configurations might be used for transmit (Tx) antennas and/or re-ceive (Rx) antennas.
The invention will be explained in more detail with reference to the accompanying figures.
Fig. 1 shows a first example of a known antenna system in which a radiating ele-ment is carried out as a flat reflector, such as a reflecting plane, or a reflect-array.
Fig. 2 shows a second example of a known antenna system in which the radiating element is carried out as a curved reflector.
Fig. 3 shows a first example of an antenna system according to the invention, in which a feed arrangement is carried out as a secondary antenna acting as focus-ing element.
Fig. 4 shows a second example of an antenna system according to the invention, comprising two antenna arrangements being mounted at respective tips of two booms that are arranged on opposite sides of a platform of the antenna system.
Fig. 5 shows a third example of an antenna system according to the invention, comprising two antenna arrangements being mounted at the tips of two booms and an additional third antenna being arranged on or close to the platform.
Fig. 1 shows a first example of a known space borne antenna system. The anten-=
The invention will be explained in more detail with reference to the accompanying figures.
Fig. 1 shows a first example of a known antenna system in which a radiating ele-ment is carried out as a flat reflector, such as a reflecting plane, or a reflect-array.
Fig. 2 shows a second example of a known antenna system in which the radiating element is carried out as a curved reflector.
Fig. 3 shows a first example of an antenna system according to the invention, in which a feed arrangement is carried out as a secondary antenna acting as focus-ing element.
Fig. 4 shows a second example of an antenna system according to the invention, comprising two antenna arrangements being mounted at respective tips of two booms that are arranged on opposite sides of a platform of the antenna system.
Fig. 5 shows a third example of an antenna system according to the invention, comprising two antenna arrangements being mounted at the tips of two booms and an additional third antenna being arranged on or close to the platform.
Fig. 1 shows a first example of a known space borne antenna system. The anten-=
6 20 bears the radiating element 40a. This means, the radiating element 40a is mounted at the tip of the boom.
In the embodiment of Fig. 1, the radiating element 40a is a flat reflector, such as a reflecting plane, or a reflect-array which typically have a surface which is within one plane. The feed system 30 is arranged on or close to the platform 10. The feed system 30 may comprise one or more antenna elements. The combination of feed system 30 and radiating element 40a is called an antenna arrangement. An electronics or control unit of the feed system 30 which is not shown in the figures can be mounted in close vicinity of the platform 10 or directly into the platform 10.
The feed system 30 and the radiating element 40a are arranged such that the ra-diating element 40a can receive electromagnetic waves from the feed system 30 and redirect them in a different direction (beam direction 50). As a result, the an-tenna arrangement constitutes a transmit (Tx) antenna.
Furthermore, the antenna arrangement could be realized such that electromagnet-ic waves received by the radiating element 40a may be directed to the feed sys-tem to constitute a receive (Rx) antenna. Likewise, the antenna system may be adapted to both receive and transmit electromagnetic waves, such that the anten-na system constitutes a receive and transmit antenna.
Fig. 2 shows a second known embodiment of a space borne antenna system which differs from the embodiment of Fig. 1 only in that, that the passive radiating element is a reflector 40b which may have a concave surface. The reflector may be a parabolic reflector or of any other shape.
In the first embodiment according to the invention and illustrated in Fig. 3 the feed arrangement is a secondary antenna 44 consisting of a reflector 43 and a feed system 30 directed to the reflector or reflect-array. The feed system 30 may corn-prise one or more antenna elements. The reflector 43 may be realized alternatively
In the embodiment of Fig. 1, the radiating element 40a is a flat reflector, such as a reflecting plane, or a reflect-array which typically have a surface which is within one plane. The feed system 30 is arranged on or close to the platform 10. The feed system 30 may comprise one or more antenna elements. The combination of feed system 30 and radiating element 40a is called an antenna arrangement. An electronics or control unit of the feed system 30 which is not shown in the figures can be mounted in close vicinity of the platform 10 or directly into the platform 10.
The feed system 30 and the radiating element 40a are arranged such that the ra-diating element 40a can receive electromagnetic waves from the feed system 30 and redirect them in a different direction (beam direction 50). As a result, the an-tenna arrangement constitutes a transmit (Tx) antenna.
Furthermore, the antenna arrangement could be realized such that electromagnet-ic waves received by the radiating element 40a may be directed to the feed sys-tem to constitute a receive (Rx) antenna. Likewise, the antenna system may be adapted to both receive and transmit electromagnetic waves, such that the anten-na system constitutes a receive and transmit antenna.
Fig. 2 shows a second known embodiment of a space borne antenna system which differs from the embodiment of Fig. 1 only in that, that the passive radiating element is a reflector 40b which may have a concave surface. The reflector may be a parabolic reflector or of any other shape.
In the first embodiment according to the invention and illustrated in Fig. 3 the feed arrangement is a secondary antenna 44 consisting of a reflector 43 and a feed system 30 directed to the reflector or reflect-array. The feed system 30 may corn-prise one or more antenna elements. The reflector 43 may be realized alternatively
7 as reflect-array. In this antenna system, the reflector 40b (or alternatively flat re-flector (e.g. reflecting plane or reflect-array) at the tip of the boom 20 constitutes a primary antenna and the antenna 44 a secondary antenna. For transmission, the primary antenna 42 on the tip of the boom receives electromagnetic waves from the secondary antenna 44 and forwards them in the direction of intention (beam direction 50). For reception, the primary antenna element 42 receives electromag-netic waves from the beam direction 50 and directs them in the direction of the secondary antenna 44.
Providing a feed arrangement on or close to the platform 10 and the first end 21 of the boom, respectively, and a radiating element at the second end 22 of the boom ensures that no RF (radio frequency) signals need to be routed along the boom via cables or waveguides. This approach avoids laying RF waveguides along the fixed or deployable boom, and minimizes calibration efforts and electrical losses in these waveguides.
An antenna system according to a second embodiment illustrated in Fig. 4 com-prises two antenna arrangements. The first antenna arrangement comprises a first boom 20-1, a first passive radiating element 40b-1 (constituting a first primary an-tenna 42-1) at the tip of the first boom 20-1 and a first feed arrangement (i.e. first secondary antenna 44-1 ) close to or arranged in the platform 10. The second an-tenna arrangement comprises a second boom 20-2, a second passive radiating element 40b-2 (constituting a second primary antenna 42-2) at the tip of the sec-ond boom 20-2 and a second feed arrangement (i.e. a second secondary antenna 44-2 ) close to or arranged in the platform 10. The first and second booms 20-and 20-2 are arranged on opposite sides of the platform 10. A baseline (distance) between the two radiators 40b-1 and 40b-2 is depicted with 60. Both feed ar-rangements (first secondary antenna 44-1 and second secondary antenna 44-2) consist of a reflecting element 43-1 and 43-2 as well as a feed system 30-1 and 30-2.
Providing a feed arrangement on or close to the platform 10 and the first end 21 of the boom, respectively, and a radiating element at the second end 22 of the boom ensures that no RF (radio frequency) signals need to be routed along the boom via cables or waveguides. This approach avoids laying RF waveguides along the fixed or deployable boom, and minimizes calibration efforts and electrical losses in these waveguides.
An antenna system according to a second embodiment illustrated in Fig. 4 com-prises two antenna arrangements. The first antenna arrangement comprises a first boom 20-1, a first passive radiating element 40b-1 (constituting a first primary an-tenna 42-1) at the tip of the first boom 20-1 and a first feed arrangement (i.e. first secondary antenna 44-1 ) close to or arranged in the platform 10. The second an-tenna arrangement comprises a second boom 20-2, a second passive radiating element 40b-2 (constituting a second primary antenna 42-2) at the tip of the sec-ond boom 20-2 and a second feed arrangement (i.e. a second secondary antenna 44-2 ) close to or arranged in the platform 10. The first and second booms 20-and 20-2 are arranged on opposite sides of the platform 10. A baseline (distance) between the two radiators 40b-1 and 40b-2 is depicted with 60. Both feed ar-rangements (first secondary antenna 44-1 and second secondary antenna 44-2) consist of a reflecting element 43-1 and 43-2 as well as a feed system 30-1 and 30-2.
8 In this antenna system, one of the antenna arrangements may be used as transmit (Tx) antenna while the other antenna arrangement may be used as receive (Rx) antenna. Alternatively, at least one of the antenna arrangements might be adapted to be a receive and transmit antenna.
The third embodiment of an antenna system according to the invention (Fig. 5) is based on the second embodiment illustrated in Fig. 4. In addition, a further an-tenna 70 is mounted on or in close vicinity to the platform 10. The antenna 70 comprises a reflector or reflect-array 72 and a feed system 71. While the further antenna 70 is adapted to receive electromagnetic waves (receive Rx antenna), the two other antenna arrangements are configured to transmit electromagnetic waves (transmit Tx antennas). Alternatively, receive and transmit direction might be inter-changed between the antenna arrangements.
An antenna system as illustrated in Figs. 4 and 5 may be used as across track and/or along track interferometric SAR.
The third embodiment of an antenna system according to the invention (Fig. 5) is based on the second embodiment illustrated in Fig. 4. In addition, a further an-tenna 70 is mounted on or in close vicinity to the platform 10. The antenna 70 comprises a reflector or reflect-array 72 and a feed system 71. While the further antenna 70 is adapted to receive electromagnetic waves (receive Rx antenna), the two other antenna arrangements are configured to transmit electromagnetic waves (transmit Tx antennas). Alternatively, receive and transmit direction might be inter-changed between the antenna arrangements.
An antenna system as illustrated in Figs. 4 and 5 may be used as across track and/or along track interferometric SAR.
9 LIST OF REFERENCE SIGNS
platform boom 20-1 first boom
platform boom 20-1 first boom
10 20-2 second boom 21 first end of boom 22 second end of boom feed system 30-1 first feed system 15 30-2 second feed system radiating element 40a reflecting plane / reflect-array 40b reflector 40b-1 first reflector 20 40b-2 second reflector 42 primary antenna =
42-1 first primary antenna 42-2 second primary antenna 43 reflector / reflecting plane / reflect-array 25 43-1 first reflector / reflecting plane / reflect-array 43-2 second reflector / reflecting plane / reflect-array 44 secondary antenna 44-1 first secondary antenna 44-2 second secondary antenna 30 50 beam direction 60 geometric baseline 70 antenna or antenna system 71 feed system 72 reflector / reflect-array 35 Rx receive beam direction 5 Tx transmit beam direction
42-1 first primary antenna 42-2 second primary antenna 43 reflector / reflecting plane / reflect-array 25 43-1 first reflector / reflecting plane / reflect-array 43-2 second reflector / reflecting plane / reflect-array 44 secondary antenna 44-1 first secondary antenna 44-2 second secondary antenna 30 50 beam direction 60 geometric baseline 70 antenna or antenna system 71 feed system 72 reflector / reflect-array 35 Rx receive beam direction 5 Tx transmit beam direction
Claims (5)
1. A space borne antenna system, comprising a platform having a first boom and a second boom, wherein the first boom extends from a first side of the platform in a first direction and the second boom extends from a second side of the platform in a second direction, wherein the first and second sides are opposite sides of the platform and the first direction is opposite to the second direction;
a first antenna arrangement comprising following elements:
a first feed arrangement arranged on or close to the platform wherein the first feed arrangement being a first focusing secondary antenna for a first radiating element comprises a first reflecting element; and the first radiating element being mounted at the tip of the first boom which is remote to the platform, wherein the first boom comprises a first end and a second end, wherein the first end of the first boom is attached to the platform and the second end of the first boom is the tip of the first boom bearing the first radiating element, wherein the first radiating element is adapted to receive electromagnetic waves from the first feed arrangement and to redirect it in a different direction and/or vice versa;
a second antenna arrangement comprising following elements:
a second feed arrangement arranged on or close to the platform wherein the second feed arrangement being a second focusing secondary antenna for a second radiating element comprises a second reflecting element; and the second radiating element being mounted at the tip of the second boom which is remote to the platform, wherein the second boom comprises a first end and a second end, wherein the first end of the second boom is attached to the platform and the second end of the second boom is the tip of the second boom bearing the second radiating element, wherein the second radiating element is adapted to receive electromagnetic waves from the second feed arrangement and to redirect it in a different direction and/or vice versa;
a further antenna arranged on the platform and adapted for reception and/or transmission of electromagnetic waves, wherein the first and second booms are deployable or extractable structures, and a boom length of the first boom is longer than a diameter of the first radiating element, and a boom length of the second boom is longer than a diameter of the second radiating element, Date Recue/Date Received 2020-10-02 wherein, in a first alternative, the further antenna is adapted to receive electromagnetic waves, while the first and second antenna arrangements are adapted to transmit electromagnetic waves, or wherein, in a second alternative, the further antenna, the first and second antenna arrangements are adapted such that the receive and transmit directions are interchanged with respect to the first alternative.
a first antenna arrangement comprising following elements:
a first feed arrangement arranged on or close to the platform wherein the first feed arrangement being a first focusing secondary antenna for a first radiating element comprises a first reflecting element; and the first radiating element being mounted at the tip of the first boom which is remote to the platform, wherein the first boom comprises a first end and a second end, wherein the first end of the first boom is attached to the platform and the second end of the first boom is the tip of the first boom bearing the first radiating element, wherein the first radiating element is adapted to receive electromagnetic waves from the first feed arrangement and to redirect it in a different direction and/or vice versa;
a second antenna arrangement comprising following elements:
a second feed arrangement arranged on or close to the platform wherein the second feed arrangement being a second focusing secondary antenna for a second radiating element comprises a second reflecting element; and the second radiating element being mounted at the tip of the second boom which is remote to the platform, wherein the second boom comprises a first end and a second end, wherein the first end of the second boom is attached to the platform and the second end of the second boom is the tip of the second boom bearing the second radiating element, wherein the second radiating element is adapted to receive electromagnetic waves from the second feed arrangement and to redirect it in a different direction and/or vice versa;
a further antenna arranged on the platform and adapted for reception and/or transmission of electromagnetic waves, wherein the first and second booms are deployable or extractable structures, and a boom length of the first boom is longer than a diameter of the first radiating element, and a boom length of the second boom is longer than a diameter of the second radiating element, Date Recue/Date Received 2020-10-02 wherein, in a first alternative, the further antenna is adapted to receive electromagnetic waves, while the first and second antenna arrangements are adapted to transmit electromagnetic waves, or wherein, in a second alternative, the further antenna, the first and second antenna arrangements are adapted such that the receive and transmit directions are interchanged with respect to the first alternative.
2. The antenna system according to claim 1, wherein each of the first and second radiating elements comprises a reflecting plane or a reflector or a reflect-array.
3. The antenna system according to claim 1 or 2, wherein each of the first and second secondary antennas comprises a reflector antenna or a reflect-array antenna or antenna elements.
4. The antenna system according to any one of claims 1 to 3, wherein the first feed arrangement is arranged on or close to the first side of the platform, and wherein the second feed arrangement is arranged on or close to the second side of the platform.
5. The antenna system according to any one of claims 1 to 4, wherein the further antenna is arranged on a third side of the platform different from the first and second sides of the platform.
Date Recue/Date Received 2020-10-02
Date Recue/Date Received 2020-10-02
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP12007610.4 | 2012-11-08 | ||
| EP12007610.4A EP2731193B1 (en) | 2012-11-08 | 2012-11-08 | Space borne antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2829633A1 CA2829633A1 (en) | 2014-05-08 |
| CA2829633C true CA2829633C (en) | 2021-08-24 |
Family
ID=47257341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2829633A Active CA2829633C (en) | 2012-11-08 | 2013-10-07 | Space borne antenna system |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2731193B1 (en) |
| CA (1) | CA2829633C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510916B (en) * | 2015-11-30 | 2017-10-17 | 中国科学院电子学研究所 | A kind of moving target detection method based on InISAR systems |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6323817B1 (en) * | 2000-01-19 | 2001-11-27 | Hughes Electronics Corporation | Antenna cluster configuration for wide-angle coverage |
| US6424314B1 (en) * | 2001-05-16 | 2002-07-23 | Space Systems/Loral, Inc. | Four axis boom for mounting reflector on satellite |
-
2012
- 2012-11-08 EP EP12007610.4A patent/EP2731193B1/en active Active
-
2013
- 2013-10-07 CA CA2829633A patent/CA2829633C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2829633A1 (en) | 2014-05-08 |
| EP2731193A1 (en) | 2014-05-14 |
| EP2731193B1 (en) | 2019-07-24 |
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