CN1108531C - Millimetre wave radio heliograph using quasioptical transmission mode - Google Patents
Millimetre wave radio heliograph using quasioptical transmission mode Download PDFInfo
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- CN1108531C CN1108531C CN 98111289 CN98111289A CN1108531C CN 1108531 C CN1108531 C CN 1108531C CN 98111289 CN98111289 CN 98111289 CN 98111289 A CN98111289 A CN 98111289A CN 1108531 C CN1108531 C CN 1108531C
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Abstract
By applying a quasi-optical technique, antenna units which are ranged in a circular array form are used to directly transmit radio frequency signals to the center of circular array in a mode of space transmission of electromagnetic waves; the radio frequency signals transmitted from the antenna units are processed in the center of the circular array; only one phase-locked local frequency system is used, and an injection locking mode is adopted to substitute for a phase-locked loop system. Besides, the distance between a receiver and a correlation processor is small, so a short cable can be used to connect the receiver and the correlation processor; all the devices are concentrated in an astronomical roundel in a central area, and thus, the phase stability of the radio frequency signals can be further enhanced by controlling the temperature of environment.
Description
The present invention relates to belong to radio astronomy technology and quasi-optical technique field with radio telescope radio signal transmission form and the relevant device system of observation solar time.
Existing radio heliograph is that the radio signal that each antenna in the antenna array is received amplifies through high frequency earlier, carries out harmonic mixing again, then the intermediate-freuqncy signal after the frequency conversion is delivered to associative processor.For the local oscillation signal that obtains to be correlated with, existing technology is that each road receiver uses a phase-locked local vibration source system, and all these phase-locked local vibration source systems all will use same reference signal.Therefore, when adopting this prior art, the receiving system of each antenna in the radio heliograph all needs to use many cables and rear end equipment to grow distance and is connected.In order to reduce the phase-unstable factor that cable is introduced, this many roads signal all must use long apart from the optical cable replacement cables, and all these optical cables all must be embedded in next Mi Duoshen of ground.Like this, each element antenna in the radio heliograph just needs 7 optical fiber, and wherein 4 are used for the transmission intermediate frequency signal, and 2 are used for transmitting the local oscillator reference signal, and an other optical fiber then is to be used for controlling.Therefore, single with regard to the radio heliograph fibre-optic transmission system (FOTS), the cost expense is just up to 1,170 ten thousand dollars.
In order to overcome the deficiency of above-mentioned prior art, the invention provides and a kind ofly use antenna element that quasi-optical technique adopts the circle battle array to arrange and directly radiofrequency signal is transmitted electromagnetic mode by the space and transfer to circle battle array central authorities, central authorities carry out relevant treatment to the radio signal that all antenna elements come in the circle battle array, only use a phase-locked vibrating system, adopt the injection locking mode to substitute phase-locked loop systems.
The present invention specifically is applied to " 98226477.1 " and " 98226478.X " utility model patent of the applicant's application in the system of the present invention, its concrete technical scheme is that the present invention is by antenna array and servo-drive system thereof, phase-locked local oscillation signal origin system, frequency mixer, intermediate frequency amplifier, receiver and associated processing system etc. are connected and form, it is characterized in that the individual antenna element of N (N is the unit number of array) in the said system constitutes antenna circle battle array with the arrangement of circumference form, each antenna element contains offset parabolic reflector in the circular array, the free cheek reverberator, the curved surface cross-sectional area of conductor, N offset parabolic reflector along circumferential arrangement on the liftoff flat certain altitude of outmost turns, the delivery outlet of offset parabolic reflector faces down and is parallel with surface level, on the ground under each offset parabolic reflector output actinal surface, a free cheek reverberator is set, the central point of this plane reflector is positioned on the center line of offset parabolic reflector output actinal surface, this plane reflector adopts Horizon mounting structure or equatorial mount shelf structure, and the position angle of this plane reflector and zenith angle or hour angle and declination are by the servo-drive system regulating and controlling.The position angle of N piece free cheek reverberator and the adjusting of zenith angle or hour angle and declination are by computer program control interlock, on the inner periphery of certain radius, along circumference N bifocal curved surface cross-sectional area of conductor is set, quantity is identical and corresponding one by one with offset parabolic reflector on the outer ring, one of them focus of curved surface cross-sectional area of conductor overlaps with the focus of offset parabola, antenna feed is installed on another focus of each curved surface cross-sectional area of conductor, two focuses of the focus of offset parabola and central ray and curved surface cross-sectional area of conductor and the phase center of central ray and feed and feed central axis are in same surface level, the central ray of offset parabola overlaps another central ray of curved surface cross-sectional area of conductor and the central axes of feed with the central ray of curved surface cross-sectional area of conductor, settles frequency mixer in the antenna feed back, intermediate frequency amplifier and receiver and phase-locked vibrating system, associated processing system.On the reflected beam direction of curved surface cross-sectional area of conductor, a plane fixed reflector can be installed, the position of this plane reflector should make the wave beam of its reflection parallel with the incident wave beam of curved surface cross-sectional area of conductor, antenna feed is installed on plane fixed reflector one side's the focus of each curved surface cross-sectional area of conductor, the central ray of curved surface cross-sectional area of conductor overlaps with the central ray of plane fixed reflector, the foveal reflex line of plane fixed reflector and the central axes of feed, the center incident ray of plane fixed reflector and the focus and the central ray of reflected ray and offset parabola, two focuses of curved surface cross-sectional area of conductor and the phase center of central ray and feed and central axis are in same surface level.Phase-locked vibrating system contains phase locked source, power divider, amplifier, frequency multiplier and controlled local oscillator, adopt Fundamental Wave Injection Locked harmonic wave extracting mode: signal is injected in the reference that obtains a low phase noise earlier on a lower frequency, then this signal is divided into the output of N road with power divider, along the circumferential direction distribute to each unit in the battle array, the signal on each road removes the controlled local oscillator of injection locking than its high integral multiple.Antenna feed, phase-locked local vibration source, power divider, frequency mixer, intermediate frequency amplifier, receiver and associative processor and the connection feeder line between them all are arranged in the temperature controlled compartment of circle battle array central area.
Drawings and Examples:
Fig. 1 is to justify the element antenna transmission signals synoptic diagram that the formation formula is arranged;
Fig. 2 is a plurality of antenna elements by cylindrical to circle central transmission manner of battle array and relevant device thereof;
Fig. 3 is to justify the element antenna transmission signals synoptic diagram (the plane fixed reflector is arranged) that the formation formula is arranged;
Fig. 4 for a plurality of antenna elements by cylindrical to the central transmission manner of circle battle array and relevant device thereof (the plane fixed reflector is arranged);
Fig. 5 is the mixing synoptic diagram of radio signal and local oscillation signal;
Fig. 6 is the electric theory diagram of injection locking local vibration source system.
Referring to Fig. 1-4, antenna array is circle battle array to be arranged, and can arrange N the overhead offset parabolic reflector 2 of certain altitude (can uniformly arrange, also can non-uniform arrangement) on the excircle, and the delivery outlet of offset parabola faces down and be parallel with surface level.If the free cheek reverberator is circular, then cross the center of circle plane reflector normal direction we be defined as the spatial direction of free cheek reverberator.The position of the sun is time dependent, but N free cheek reverberator all applied optics coelostat principle all the time will be from the radio signal reflex of the sun to zenith direction (direction vertical with surface level), if the position of the sun is position angle A, zenith angle Z (or angle of pitch H), when then N free cheek reverberator all adopts Horizon mounting structure, their spatial direction guarantees all to be position angle A by servo-drive system, zenith angle Z/2.N free cheek reverberator also can adopt the empty shelf structure in equator, and the position of establishing the sun is hour angle t and declination δ, and the geographic latitude of observation station is φ, and then the transformation relation between Horizon coordinate and equatorial coordinates is
CosZ＝SinH＝Sinφ·Sinδ+Cosφ·Cosδ·Cost
SinA＝Cosδ·SecH·Sint
CosA＝SecH·(Sinφ·Cosδ-Cosφ·Sinδ)
The position angle of N free cheek reverberator defines with positive south by west, and the due south is orientation zero reference point (starting point), and zenith angle is zero reference point (starting point) when pointing to zenith.When the millimeter wave radio heliograph is followed the tracks of the solar time, appliance computer makes N free cheek reverberator follow the tracks of the sun simultaneously, that is: following the tracks of the solar time, the Horizon mounting need be adjusted N free cheek reverberator position angle and zenith angle at any time according to the position of above-mentioned in advance good sun operation, and this can be adopted and finished by servo-drive system two drive systems of computerizeing control.The adjusting of the position angle of N free cheek reverberator and zenith angle or hour angle and declination is linked by computer control, can both all the time the radio signal from the sun be reflexed to simultaneously zenith direction (direction vertical with surface level) to guarantee every reverberator.The outside diameter of circle battle array is chosen according to the desired spatial resolution of radio heliograph, has determined the central point of round battle array simultaneously, according to desired antenna element number and antenna element spacing, determines the position of a plurality of offset parabolic antennas on circle battle array excircle.On the inner periphery of distance circle battle array center certain distance, arrange N bifocal curved surface cross-sectional area of conductor 3 (can be ellipsoid cross section or hyperbolic cross section), the quantity of the offset parabola of arranging on the quantity of curved surface cross-sectional area of conductor 3 and the excircle 2 is identical and corresponding one by one, and at outgoing beam direction mounting plane fixed reflector 4 (Fig. 3 of each curved surface cross-sectional area of conductor 3,4), its effect is signal beam to be turned to another direction partially (as not establishing plane fixed reflector 4, then needing in the antenna feed back connection waveguide bend to be set is connected (as Fig. 1 with frequency mixer, 2) status requirement between each device of, arranging on the internal and external circumference as previously mentioned.Antenna feed 5 is installed on plane fixed reflector one side's the focal position of curved surface cross-sectional area of conductor 3.Frequency mixer 8, intermediate frequency amplifier 9 and receiver 10 are set in the back of antenna feed 5, central authorities settle phase-locked vibrating system to export frequency mixer 8 in the circle battle array, the layout of said system equipment, constitute superheterodyne receiver, radiofrequency signal (RF) and local oscillation signal (LO) are sent in the frequency mixer 8, frequency conversion is after intermediate frequency amplifier 9 enters receiver 10 (as Fig. 5), and central authorities carry out relevant treatment in the circle battle array.Shown in Fig. 6 square frame, phase-locked vibrating system contains phase locked source 6, power divider 7, amplifier 11, frequency multiplier 12, controlled local oscillator 13, earlier on a lower frequency (12GHz), signal is injected in the reference that obtains a low phase noise, then this reference signal is divided into the N road along circumference, every road signal removes the controlled local oscillator of its high integral multiple of injection locking frequency ratio after secondary frequency multiplication and amplification.
The course of work of the present invention is as follows: when the sun is observed, the radio signal that the sun sent is after 1 reflection of plane rotary reflection plate, being biased parabola antenna 2 receives, and focus on the focal plane, this radio signal continues to be transmitted to curved surface cross-sectional area of conductor 3 in circle then, and this radio signal focused on once more, and turn to the back to be received by plane fixed reflector 4 to enter frequency mixer 8 by feed 5, phase-locked local oscillation signal also enters frequency mixer 8, two groups of signals after the frequency mixer frequency conversion by intermediate frequency amplifier to receiver, each unit receiver exports circle battle array central authorities to and carries out relevant treatment.As an embodiment, a circle battle array excircle radius R=210 meters, inner periphery radius R=5 meter, medium-frequency IF adopts high intermediate frequency scheme, and first intermediate frequency can be used 4GHz, and intermediate frequency amplifier adopts the high-gain low-noise amplifier of this wave band.Offset parabolic antenna output actinal surface is from size (diameter) reference 98226477.1 utility application of the height and the free cheek reverberator of free cheek reverberator, and the selection of parameter of curved surface cross-sectional area of conductor and antenna feed and plane fixed reflector is with reference to 98226478.X utility application and relevant quasi-optics computing formula.
The present invention compares with existing radio heliograph, and following advantage and effect are arranged:
1, adopt quasi-optical technique directly radiofrequency signal to be passed through the space from each element antenna on the circle battle array Transmission, the loss of radio signal is very low, the phase stability height.
2. antenna feed 5, frequency mixer 8, intermediate frequency amplifier 9, receiver 10 and associative processor system and phase-locked vibrating system 6,7,11,12,13 all are positioned at circle battle array central authorities.Like this, the local oscillator reference signal of all receivers can adopt the injection locking mode fully, therefore, realizes that the relevant of local oscillation signal of all receivers just becomes not only convenient but also feasible.Prior art must be used a phase-locked local vibration source, system complex by each road receiver, involves great expense.
3, the unification of radio signal is transferred to the central authorities' reception of circle battle array and handles, and distance is very near between receiver and the associative processor, can use very short cable to connect fully, thereby installation and easy construction.
4, transmission line of the present invention has only several meters long with respect to the ten thousand metres long transmission line of existing radio heliograph, thereby installation and executive cost reduce greatly, has only about 1/100 of existing radio heliograph transmission system.
5. the radio signal is received and handles by the unified circle battle array central authorities that are transferred to, receiving equipment and transmission line can be positioned in the astronomical circle fort, in astronomy circle fort, use the temperature control environment can further improve the phase stability of radio signal greatly, also be convenient to maintenance and management.
6, all receivers of the present invention, associative processor and intermediate frequency, this vibrating system all are arranged in the astronomical circle fort, transmission line adopts cable can satisfy performance requirement under the temperature control environment, and prior art is quite harsh to the performance requirement of transmission line, it requires in-10 ℃ to 20 ℃ temperature ranges, the temperature coefficient of transmission line should reach 0.2ppm/ ℃, and transmission line must be embedded in next Mi Duoshen of ground.
What 7, be easy to generate phase change most in the radio telescope is exactly transmission line temperature variation and the electrical length that causes changes.System of the present invention does not have a transmission line outdoor, at indoor use temperature control environment thereby be not subjected to the weather Temperature Influence, and existing radio heliograph reaches tens meters to several kms because of the outdoor section transmission line, the phase change of the transmission signals that is caused by the temperature coefficient of transmission line is very big, when serious even make the two paths of signals of radio interferometer lose the coherence.
Claims (5)
1. use the millimeter wave radio heliograph of quasi-optical transmission mode, by antenna array and servo-drive system thereof, phase-locked local oscillation signal origin system, frequency mixer, intermediate frequency amplifier, receiver and associated processing system are connected and form, it is characterized in that N antenna element in the said system constitutes antenna circle battle array with the arrangement of circumference form, each antenna element contains offset parabolic reflector in the circular array, the free cheek reverberator, the curved surface cross-sectional area of conductor, N offset parabolic reflector along circumferential arrangement on the liftoff flat certain altitude of outmost turns, the delivery outlet of offset parabolic reflector faces down and is parallel with surface level, on the ground under each offset parabolic reflector output actinal surface, a free cheek reverberator is set, the central point of this plane reflector is positioned on the center line of offset parabolic reflector output actinal surface, this plane reflector adopts Horizon mounting structure or equatorial mount shelf structure, and the position angle of this plane reflector and zenith angle or hour angle and declination are by the servo-drive system regulating and controlling, the position angle of N piece free cheek reverberator and the adjusting of zenith angle or hour angle and declination are by computer program control interlock, on the inner periphery of certain radius, along circumference N bifocal curved surface cross-sectional area of conductor is set, quantity is identical and corresponding one by one with offset parabolic reflector on the outer ring, one of them focus of curved surface cross-sectional area of conductor overlaps with the focus of offset parabola, antenna feed is installed on another focus of each curved surface cross-sectional area of conductor, two focuses of the focus of offset parabola and central ray and curved surface cross-sectional area of conductor and the phase center of central ray and feed and feed central axis are in same surface level, the central ray of offset parabola overlaps with the central ray of curved surface cross-sectional area of conductor, another central ray of curved surface cross-sectional area of conductor and the central axes of feed are settled frequency mixer in the antenna feed back, intermediate frequency amplifier and receiver and phase-locked vibrating system, associated processing system.
2. require 1 described millimeter wave radio heliograph according to profit extremely, it is characterized in that on the reflected beam direction of curved surface cross-sectional area of conductor, installing a plane fixed reflector, the position of this plane reflector should make the wave beam of its reflection parallel with the incident wave beam of curved surface cross-sectional area of conductor, antenna feed is installed on plane fixed reflector one side's the focus of each curved surface cross-sectional area of conductor, the central ray of curved surface cross-sectional area of conductor overlaps with the central ray of plane fixed reflector, the foveal reflex line of plane fixed reflector and the central axes of feed, the center incident ray of plane fixed reflector and the focus and the central ray of reflected ray and offset parabola, two focuses of curved surface cross-sectional area of conductor and the phase center of central ray and feed and central axis are in same surface level.
3. millimeter wave radio heliograph according to claim 1 and 2, it is characterized in that phase-locked vibrating system contains phase locked source, power divider, amplifier, frequency multiplier and controlled local oscillator, adopt Fundamental Wave Injection Locked harmonic wave extracting mode: the reference injection signal that obtains a low phase noise earlier on a lower frequency is divided into the output of N road with this signal with power divider then, along the circumferential direction distributes to each unit in the battle array.The signal on each road removes the controlled local oscillator of injection locking than its high integral multiple.
4, millimeter wave radio heliograph according to claim 1 and 2 is characterized in that antenna feed, pin phase local vibration source, power divider, frequency mixer, intermediate frequency amplifier, receiver and associated processing system and the connection feeder line between them all are arranged in the temperature controlled compartment of circle battle array central area.
5. according to claims 3 described millimeter wave radio heliographs, it is characterized in that antenna feed, phase-locked local vibration source, power divider, frequency mixer, intermediate frequency amplifier, receiver and associated processing system and the connection feeder line between them all are arranged in the temperature controlled compartment of circle battle array central area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98111289 CN1108531C (en) | 1998-05-08 | 1998-05-08 | Millimetre wave radio heliograph using quasioptical transmission mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98111289 CN1108531C (en) | 1998-05-08 | 1998-05-08 | Millimetre wave radio heliograph using quasioptical transmission mode |
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| Publication Number | Publication Date |
|---|---|
| CN1203362A CN1203362A (en) | 1998-12-30 |
| CN1108531C true CN1108531C (en) | 2003-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 98111289 Expired - Fee Related CN1108531C (en) | 1998-05-08 | 1998-05-08 | Millimetre wave radio heliograph using quasioptical transmission mode |
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| CN103473795A (en) * | 2013-06-20 | 2013-12-25 | 西安电子科技大学 | Heliograph antisolar imaging method based on compressed sensing |
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- 1998-05-08 CN CN 98111289 patent/CN1108531C/en not_active Expired - Fee Related
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| CN1203362A (en) | 1998-12-30 |
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