CN2483842Y

CN2483842Y - Radio tracking telescope

Info

Publication number: CN2483842Y
Application number: CN 98242812
Authority: CN
Inventors: 殷兴辉
Original assignee: Purple Mountain Observatory of CAS
Current assignee: Purple Mountain Observatory of CAS
Priority date: 1998-12-03
Filing date: 1998-12-03
Publication date: 2002-03-27
Anticipated expiration: 2008-12-03

Abstract

A radio tracking telescope which adopts a brand-new tracking device is characterized in that the feed source of the radio telescope or the axis of the sub-reflector has a certain distance offset from the main shaft axis and the rotary mechanism of the feed source or the sub-reflector is arranged. The feed source output signal is divided into two. One is connected with an error signal processing circuit. The other is connected with a radiometer. When the main shaft deviates from the target, two error signals are obtained from the signal which is output by the feed source or the sub-reflector during the rotation process via detection and filtering in a tracking receiver. The two error signals act on a servo system after amplifying to control the automatic tracking of the radio telescope.

Description

The radio tracking telescope

The utility model relates to a kind of astronomical telescope, the radio tracking telescope of the accurate tracking target radio source of particularly a kind of energy.

The observed object of radio astronomy is the remote celestial radio source of distance, it is very faint to arrive telescopical signal, when utilizing radio astronomical telescope to observe these celestial bodies, the main shaft (symmetry axis of paraboloidal reflector) of radio telescope parabolic antenna must be aimed at measured target, and carry out long tracking observation, lean on long integration to improve sensitivity.Traditional radio telescope is that feed or subreflector are contained on the main shaft of reflecting surface, and the axis of feed or subreflector overlaps fully with main shaft, and its output signal inserts the receiver radiation meter of making observation usefulness; Telescopical tracking means is a cover servomechanism (not having related between tracking means and feed and the receiver), paperback has installed data processor (available single-chip microcomputer or single board computer) over the ground, wherein set in advance tracking data, data processor connects servo amplifier, servo amplifier connects servomotor, the mechanical motion mechanism that connects radio telescope is again finished the tracking action by in advance good data.Be that azimuth mounting is adjusted the azimuth and the angle of pitch at any time according in advance good motion of celestial body position; To equatorial then is that (the hour angle axle is an axle that is parallel to earth's axis by doing uniform rotation in 360 °/24 hours along the hour angle axle; Speed is to offset the speed of earth rotation effect), this tracking means can only be done the tracking of constant speed.This tracking mode can keep the tested celestial body of telescope spindle alignment in theory, but in fact it is offset the target location that atmospheric refraction produces, and the error that (for example the gravity flexure of supports such as paraboloidal reflector, bi-curved reflector and feed etc.) caused because the deformation of telescope mechanical structure then can't be made and being corrected timely, so for very faint celestial source radiation signal, lose objects very easily in tracking is so that can't finish measurement to observed object.

The utility model will provide a kind of radio tracking telescope of being furnished with novel tracking means, new construction will be abandoned the mode of doing target following by fixed data, but revise the telescope major axes orientation at any time by the physical location of tested celestial body, to guarantee all the time accurately tracking target.

The scheme of finishing above-mentioned task is: on the basis of existing radio tracking telescope, axis and telescope main-shaft axis skew certain distance with radio telescope feed or subreflector, and be provided with and make feed or subreflector rotating mechanism around main axis rotation, output signal with feed is divided into two-way simultaneously, one the road inserts track receiver, comprises the error signal treatment circuit in the track receiver; The radiometer of observation receiver is inserted on another road.When actual design, also track receiver and observation receiver can be made an integral body.Here said " making feed or the subreflector rotating mechanism around main axis rotation " can adopt traditional mechanical rotation mechanism; Said " certain distance " is by the beam intersects angle of telescope antenna and the degree of depth decision that intersects.During radio telescope work, the signal of observed object is made conical scanning through reflector to this feed or the subreflector through rotating arrive antenna feed, when telescope spindle alignment target, feed in the rotation or subreflector are passed to the signal strength signal intensity unanimity of track receiver input; When causing its main shaft to depart from observed object along with earth rotation or other factors, feed or subreflector are passed to the signal strength signal intensity of track receiver input in rotary course inconsistent, in track receiver, after detection and filtering, obtain orientation and the output of pitching two-way error signal, error signal acts on servomechanism respectively after amplifying, drive servomotor control radio telescope from motion tracking through servo amplifier.

The telescopical tracking means of the utility model has adopted new structure, the tracking mode of new construction is different fully with conventional method, because adopting, it follows the orientation that obtains according to conical scanning, the working method that pitching two-way error signal is revised major axes orientation at any time, so can eliminate the main shaft skew that a variety of causes produces, can guarantee that telescope aims at observed object all the time.

Now be described further with embodiment in conjunction with the accompanying drawings.

Fig. 1 is embodiment 1 structural representation;

Fig. 2 is embodiment 2 structural representations.

Embodiment 1, main burnt paraboloid structure radio tracking telescope, with reference to Fig. 1: telescope feed 1 has certain distance d with the axis (main shaft) of paraboloidal reflector 2 symmetry axis, and is connect by motor-operated transmission mechanism with one, and this transmission mechanism drives feed and rotates around main shaft.The output of feed is divided into two-way, and one the tunnel connects track receiver 3, comprises the error signal treatment circuit in the track receiver; Another road connects measuring radiation meter 4.The telescopical follower of output termination of track receiver.Because the phase center of feed is not to be positioned on the telescopical focus, but horizontal inclined to one side Jiao is arranged, therefore, the maximum of radio telescope lobe departs from the telescope main shaft at an angle, and along with the space that is rotated in of feed forms conical scan.In this scanning process, the signal of track receiver 3 inputs will be subjected to the modulation of rotary beam, obtain orientation and the output of pitching two-way error signal after detection and filtering.This two-way error signal acts on a cover servomechanism separately after amplifying, drive servomotor 6 control radio telescopes through servo amplifier 5 respectively and carry out from motion tracking.When radio source was in tracked state, promptly radio source was on the radio telescope main shaft, and no matter which direction wave beam rotates in the process of carrying out conical scanning, and the signal amplitude of track receiver input can remain unchanged.Another road signal that picks out from antenna inserts radiometer, therefore, can finish the radio astronomy observation to this radio source when realizing the correlation power supply trace.

Embodiment 2, and with reference to Fig. 2: radio telescope is a Cassegrain formula dual reflector structure, between the axis of its hyperboloid subreflector 8 and the paraboloidal reflector 7 certain distance is arranged, and subreflector is driven around main axis rotation by motor and transmission mechanism.The signal of observed object arrives feed 9 through the subreflector 8 of rotation, and inserts radiometer 4 and track receiver 3 respectively, and error signal commander servomechanism 5, the 6 control telescopes of track receiver output carry out from motion tracking.

Claims

1, a kind of radio tracking telescope, be provided with reflector, feed or subreflector, be provided with tracking means simultaneously, tracking means is provided with servomechanism, wherein be provided with servo amplifier, servo amplifier connects the mechanical motion mechanism that servomotor connects radio telescope again, it is characterized in that: the axis of radio telescope feed or subreflector and telescope main-shaft axis skew certain distance, and be provided with and make feed or subreflector rotating mechanism around main axis rotation, output signal with feed is divided into two-way simultaneously, one the road inserts track receiver, comprises the error signal treatment circuit in the track receiver, and radiometer is inserted on another road.

2, according to the described radio tracking telescope of claim 1, it is characterized in that: the distance between feed or subreflector axis and main shaft is determined by the telescopical beam intersects angle and the degree of depth of intersecting.