CN108152587A - Radio spectral line observation system based on agile transceiver - Google Patents
Radio spectral line observation system based on agile transceiver Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of radio spectral line observation system based on agile transceiver, including agile transceiver, two power splitters, computer；Or including agile transceiver, radio monitoring antenna, radio monitoring receiver, computer；Observation acquisition channel and radio environment monitoring channel are formed in agile transceiver；Present system is observed radio spectral line using agile transceiver, can arbitrarily be gated first with the broadband input of agile transceiver and 56MHz passbands, realizes the high frequency spectral resolution observation to spectral line；It simultaneously because being integrated with the function of program-controlled local oscillator and down coversion, can realize that frequency error factor is calibrated, reduce traditional antenna and be directed toward in calibration, antenna pointing angle particularly pitch angle changes the change brought to antenna performance；In addition, monitoring channel monitoring using radio environment and choosing method of the noiseless frequency band as calibration frequency band, it can effectively evade radio-interference signals.
Description
Technical field
The present invention is suitable for the spectral line observation field of radio astronomy narrowband, high spectral resolution, is calibrated using frequency error factor
Radio interference is evaded in the monitoring of (frequency switching) and radio environment, is realized fast hi-resolution observation and is determined
Mark.
Background technology
Microwave line has very important status in radio astronomy observation, the basic object available for the related celestial body of diagnosis
Reason and electrochemical conditions, such as the change of excitation temperature, particle density, the velocity field in motion of matter area, magnetic induction intensity and various elements
Learn abundance etc..After the spectral line data that molecular cloud and In A Region of Star Formation are obtained by observation, can by appropriate approximation method come
Statistical equilibrium equation of radiative transfer is solved, so as to obtain the various information of celestial body.
By the observation to molecular spectrum, research will be allowed us to and include In A Region of Star Formation early stage, stellar evolution evening
The a series of astronomy phenomenons such as phase, supernova explosion (supernova remnant (SNR)), planetary nebula, comet, extragalactic system.To them
In the observational study of C-band spectral line, many research contents are associated with, such as：(1) it grinds based on 6.7GHz methanol masers are relevant
Study carefully, 6.7GHz methanol masers due to its radiant flux is big, fine and close (about 4 milli rad of angle size, the about several astronomical units of line size),
The spies such as long lifespan (about 4 years), generally existing (a source more than 1000 is detected in the milky way galaxy) and very small inside proper motion
Point becomes the big hot spot in astronomy and astrometry.They be not used only for carry out with massive star formed it is related
A series of researchs, and by accurate some key parameters that can accurately determine the milky way galaxy that measure to their parallaxes (as revolved
Arm configuration, this is the measuring method of full accuracy so far), it is an emphasis in the research of the milky way galaxy；(2) based on hydroxyl and
The research of formaldehyde spectral line and the hot fields having recently received great interest include the search of formaldehyde sample and their radiation
Characteristic, hydroxyl maser search and observation polarized by hydroxyl study some research contents such as magnetic field；(3) in addition also have very
More research contents：Such as molecular spectrum search of C-band etc., it is not enumerating herein.
The spectral line observation of high frequency spectral resolution can bring the letter of more details inside institute's goal in research celestial body for researchers
Breath, they can usually make us track the structure of smaller scale and wherein more detailed dynamic characteristic etc..For another example exist
High frequency resolution is needed, such as in the observation of Zeemen effect in certain high-precision spectral line observations：Using neutral hydrogen
HI is observed, the frequency shifts 2.8Hz generated per microgasuss magnetic field；The ground state of OH is such as used, per microgasuss magnetic field in 1.665GHz
The frequency shifts generated on spectral line only have 3.27Hz, and the frequency shifts generated on 1.667GHz spectral lines are 1.96Hz.However,
Since radio astronomy terminal device conventionally employed at present is the high-speed ADC over-sampling principle realization to radio astronomy analog signal
's：Sample rate is fsampleADC can about cover fsampleThe signal of/2 bandwidth increases sample rate and seems to become solution greatly at present
Band data acquires, and realizes the unique channel that broadband is observed simultaneously.
And due to sample rate f under the principlesample, FFT points Ns and spectral resolution Δ f three satisfaction with ShiShimonoseki
System：
Therefore under traditional sampling principle, the high-accurate outline structure observation for doing spectral line is very difficult.Because in sample rate one
In the case of fixed, FFT transform points N must be increased if obtaining higher spectral resolution, this just needs consuming to handle
The resources such as device internal multiplier, accumulator and storage unit, considerably increase amount of redundant data in this way, to no signal frequency band
It needs to be carried out at the same time analysis.
At present, major chip companies and modular instrument company are all in succession in the data acquisition for carrying out higher speed more high bandwidth
Chip and equipment are designed and developed, and a variety of high-speed data acquisition equipment have been applied to part astronomical observation.Such as:Acqiris is public
The high-speed data acquisition card AC240 of exploitation is taken charge of, bandwidth is 1GHz@8bit, applied to more radio telescopes, including moral
Enable the 13.7 meters of millimetric-wave telescopes breathed out, KOSMA millimeter wave submillimeter-wave telescopes；In August, 2014, HOMIN JIANG et al.
It discloses sampling rate and reaches the FFTS data acquisition of high speed acquisition system and B.Klien of 5Gsps@8bits et al. research and development eventually
End is the most fast radio astronomy terminal of current sample rate.
However the characteristics of being radiated according to atom-exciting, the characteristics of molecular spectrum shows discrete local dense line spectrum and another
The radio spectral line that some outer frequency bands can be observed is again considerably less.In this way, the superior resources of high-speed data acquisition are with regard to billow
Expense is in the frequency that some do not have Observable signal, and sample rate is higher, and waste is more.
Digital terminal-the TasPGA of 100MHz input bandwidth that A.W.Hotan in 2008 et al. is realized, in observation maser sources
G285.35+0.00, the spectral resolution of 488.3Hz is realized in 8MHz bandwidth needs 16384 point FFT.B.Klein et al. exists
Realize that 88.3KHz has needed 32768 point FFT on FFTS.
With the rising of picking rate, these will be greatly increased by needing to reach the points of the FFT needed for similary frequency resolution
All carry out immense pressure for rear end operation, storage, conveyor.
In view of the above-mentioned problems, S.Stanko in 2005 et al. attempts to establish on Effelsberg 100m radio telescopes
It is based on the digital spectrum analysis terminal ICS of DDC-GC4016 (digital down converters, digital down converter)
554C is introduced in the concept of Direct Digital down coversion and spectral line digital terminal, and there are two types of working methods：1. work in full band
Wide mode：50MHz is directly acquired by ADC and is done fft analysis into FPGA；2. narrowband operation mode：20KHz- is gated through DDC
10MHz bandwidth is re-fed into FPGA processing.
Under 2MHz bandwidth modes, it is equivalent to the frequency point that FFT points identical under full bandwidth pattern improve 25 times
Resolution.
Meanwhile positive Yao of Yunnan University cypress, Yunnan Observatory, Chinese Academy of Sciences Dong Liang et al. are proposed based on lack sampling scheme
Acquisition terminal, can reach higher resolution ratio performance using the lack sampling performance of ADC.But both the above scheme is all with increasing
The labyrinth on road is powered up as cost, today that integrated circuit makes rapid progress new integrated circuit can replace above-mentioned side
Case.
The AD93xx family chips that ADI companies release at present are a kind of high-performance, highly integrated RF Agile
TransceiverTMAgile transceiver.The programmability and broadband ability of the device become the ideal of a variety of transceiver applications
Selection.The device integrates RF front ends and flexible mixed signal baseband part, integrates frequency synthesizer, is provided for processor
Configurable digital interface imports so as to simplify design.Such as：AD9361 operating frequency ranges are 70MHz to 6.0GHz, are covered big
Part charter and exempt from Licensed Bands, the bandwidth chahnel of support is ranging from less than 200KHz to 56MHz.
Compared to traditional high-speed sampling digital spectrum terminal, the input bandwidth that 6GHz is reached according to Nyquist law must
Must at least there be the sample rate of 12Gsps, thus in the input bandwidth of agile transceiver selection 200kHz, reach same
The resolution ratio of sample is equivalent to points and improves 240000 times.
The advantage of the device also resides in simultaneously：The accurate variation of local oscillator can be quickly realized in piece by program control,
And then realize the variation of acquisition signal center frequency point, so as to reach the calibration of frequency-switching observation.Compared to cutting
It changes antenna and is directed toward the point-switching calibration modes for being directed at cold sky, the advantage of this kind of calibration mode is, can observe
Do not change the direction of antenna in the process, so as to reduce the influence that different pitch angles come to antenna deformation band, be very suitable for picture
The large-scale antenna of this type of FAST；Meanwhile using the switching of local oscillator, being directed toward switching compared to antenna has faster speed, can
To realize quick calibration, observation time, the purpose for improving observed efficiency are saved.
But now with the growing tension of radio resource, more and more radio interferences cause radio astronomy
The deterioration of observing environment, when carrying out frequency-switching calibration observations, if the observation simulation memory as baseline
Calibration data effect will be influenced in radio interference, for this reason, it may be necessary to select the calibration of no radio interference before calibration
Frequency band is extremely important,
The present invention uses newest agile transceiver technologies, establishes two acquisition channel systems, one of acquisition channel needle
The work such as spectral line signal data acquisition, frequency-switching calibrations are completed to radio spectral line signal, another is adopted
Collect channel then to investigate for radio environment, the baseline frequency band of " quiet " is chosen for frequency-switching calibrations.
Invention content
The present invention provides a kind of radio spectral line observation systems based on agile transceiver, are received and dispatched including agile
Device, two power splitters, computer, agile transceiver are connect with computer, and agile transceiver passes through two power splitters and radio telescope
Analog receiver connection, the radio signal that receives of acquisition Radio Telescope Antenna simultaneously forms observation in agile transceiver and adopts
Collect channel, while monitor the radio environment situation in observation frequency point or so frequency band, choose the radio bands not interfered with and use
Make the baseline frequency band calibrated and radio environment monitoring channel is formed in agile transceiver.
Radio spectral line observation system the present invention is based on agile transceiver can also include agile transceiver, radio
Monitoring aerial, radio monitoring receiver, computer, agile transceiver are connect with computer, and agile transceiver is looked in the distance with radio
The analog receiver connection of mirror simultaneously forms observation acquisition channel in agile transceiver, and radio monitoring antenna is supervised by radio
Receiver is surveyed to connect with agile transceiver and form radio environment monitoring channel in agile transceiver.
The computer is included with lower module：
Radio monitoring module, monitoring are used in the bandwidth of calibration with the presence or absence of radio interference, by acquiring in difference
Heart frequency point bandwidth is the radio signal in the frequency band of W, and after carrying out FFT transform, the difference in magnitude between more each channel is chosen
There is no the frequency band of radio interference as calibration frequency band, determine departure freqency Δ ν Hz；
Observe module, observation the stage for agile transceiver observation acquisition channel centre frequency ν, observation bandwidth w with
And the setting of spectral resolution N, centre frequency ν are set as spectral line observation frequency point, while it is logical to receive the observation acquisition of agile transceiver
The data that road is sent carry out FFT transform；Spectral line observation frequency point ± Δ ν Hz are respectively offset from dimensioning phase centre frequency ν, observe band
Wide w is constant, using calibration frequency band as data baseline；
Memory module, for observing the preservation of data after data, radio environment monitoring data and calibration are handled.
A, acquisition channel is observed
Wherein, observation acquisition channel is using one in two input channels of agile transceiver, directly and radio telescope
Radio frequency or the output of intermediate frequency analog receiver be connected, the signal that receives of radio telescope is directly acquired, from antenna through simulation
Receiver amplification output signal power p can be expressed with following equation：
Wherein Tsou(v) by the beta radiation of radio sourceIt is radiated with continuous spectrumComposition；But Tsou(v) it is not true
Real radio source radiation brightness degree, it and true brightness temperatureBetween relationship be：
ηapFor antenna efficiency, τ 0 is atmospheric opacity, AM=sin-1(El)
Wherein system noiseIt is made of the following aspects：
Wherein：
| Tbg | Come from the radiation in microwave background and universe |
| Tatm | Radiation from air |
| Tspill | Radiation from ground |
| Tsw | The noise (situation for being generally from secondary focusing) that standing wave is brought |
| Tloss | The noise that feed loss is brought |
| Trx | Noise from receiver |
| Tcal | The noise injected by noise diode |
Simultaneously using the program-controlled adjustable local oscillator inside agile transceiver, the switching of observation center frequency point is realized, reach fixed
Target purpose, in frequency error factor calibration mode, traditional method is to adjust the frequency of RF local oscillator (to pass through on receiver chain road
Phaselocked loop is adjusted to realize), its center frequency point observed is made to deviate observation frequency point so that observation simulation falls into calibration frequency range；Due to victory
Become transceiver local oscillator is placed in piece, the local oscillator can be controlled to reach said frequencies to the output frequency of frequency mixer by program
The characteristics of switching, as shown in Figure 4；
Concrete operations flow is as follows：
1st, channel is monitored by radio environment and determines the quiet passband of radio environment, and then determine next step local oscillator
Departure freqency；
2nd, adjustment local oscillator deviates center frequency point-Δ v, remembers that signal output spectrum function at this time is
It is abbreviated as：
3rd, first adjustment local oscillator deviates center frequency point+Δ ν, remembers that signal output spectrum function at this time is
It is abbreviated as：
Assuming that in a relatively narrow frequency band inner receiver flat gain, i.e. GRF,+=GRF,-=constant constants；
Wherein
Wherein Δ Tsys,±In the case that whether noise injection be equal, Δ Tcal,±It is 0 in noiseless injection,
It is not 0 in the case of injecting noise；Make following two equations：Determine two reference noise temperature；
The average value of two temperature is taken as bottom of making an uproar：
B, radio environment monitoring channel
Radio environment monitoring channel uses another in two input channels of agile transceiver, is seen for Simultaneous Monitoring
Radio environment situation in frequency measurement point or so frequency band is chosen the radio bands not interfered with and is used for as the baseline frequency calibrated
Band, there are two types of schemes：1st, two power splitter schemes are connect using radio telescope system main channel；2nd, it using accessory channel scheme, adopts
With auxiliary radio monitoring aerial, radio monitoring receiver.
The advantage of the first string is not needing to increase excessive microwave device with fast construction system, but meeting
Increase certain system noise；
Subjective survey channel performance can not be influenced in second scheme, is connect using radio monitoring antenna and radio monitoring
Receipts machine employs wide-band microwave scheme, realizes broadband input, while monitoring receiver setting observes channel with radio telescope
Unanimously, ensure that the signal input port bandwidth of observation acquisition channel is identical with the signal input port bandwidth of radio environment monitoring channel.
C, the determining scheme of frequency band is calibrated
Radio environment monitors radio-frequency spectrum of the channel monitoring in wider frequency range, and radio environment monitoring is logical
The bandwidth in road will be significantly wider than spectral line observation bandwidth, thus in radio monitoring bandwidth, FFT transform be carried out, by judging band
The position of upper and lower two calibrations frequency band is determined, i.e., in the position of interior radio interference：The frequency that local oscillator needs are adjusted in observation channel
Rate size delta ν.
Use scheme for：First by acquiring radio monitoring bandwidth internal power spectrum density distribution situation after FFT transform, so
After acquire this section of power spectrum mean value m and variances sigma, then compare the difference with interior each frequency point power spectral density and mean value m one by one, if
Variances sigma more than 3 times, if the variances sigma no more than 3 times, then it is assumed that the frequency point signal is noise, without radio interference；Instead
It, then the frequency point exist interference, the frequency band be not suitable for for calibrate frequency band, then further slide selection bandwidth observed,
Assessment.D, the effect of computer
Computer controls the setting of agile transceiver relevant parameter by USB or network etc., including centre frequency ν, sees
The wide W of measuring tape, spectral resolution N after receiving observation channel and collecting data, carry out fft analysis；
Computer is sent back to after the data acquisition of the channel of radio environment monitoring simultaneously, radio interference is done and determines, by nothing
After line pyroelectric monitor module determines calibration frequency band, in dimensioning phase, control centre's frequency is respectively offset from spectral line observation frequency point ± Δ ν
Hz；In a computer, gathered data is divided into data after observation data, radio environment monitoring data and calibration are handled and carries out
Storage.
Key is：
1st, since agile transceiver has, broadband inputs and passband can be gated arbitrarily, can realize the high spectrum point to spectral line
Resolution is observed；
2nd, by the program-controlled local oscillator being integrated in inside agile transceiver, cutting by program-controlled center frequency point can be realized
It changes, realizes frequency error factor calibration (frequency-switching calibration)；
3rd, monitoring of the channel to radio environment is monitored by radio environment, determining for no radio interference can be obtained
Frequency band is marked, which is compared with radio source observation data, finally determines flowrate of radio source；
4th, when determining that calibration frequency band whether there is radio interference, by the power spectral density value of each frequency point with interior
The scheme that the mean value m and variances sigma of all frequency point power spectral densities are compared, it is radio interference letter to determine the frequency point
Number；
It 5th, thus can be at present since the tool such as part agile transponder chip AD9361, AD9371 is there are two receiving channel
Observation acquisition channel and radio environment monitoring channel are integrated in a piece of agile transceiver, one of receiving channel is responsible for
Radio astronomy is observed, another channel is responsible for radio environment monitoring.
Effect of the invention is that：
Radio spectral line is observed using agile transceiver, first with agile transceiver broadband input and
56MHz passbands can be gated arbitrarily, realize the high frequency spectral resolution observation to spectral line；Simultaneously because it is integrated with program-controlled local oscillator and lower change
The function of frequency can realize that frequency error factor is calibrated, and reduce traditional antenna and be directed toward in calibration, antenna pointing angle is particularly bowed
The elevation angle changes the change brought to antenna performance；
In addition, channel monitoring is monitored using radio environment and chooses method of the noiseless frequency band as calibration frequency band, it can
Effectively to evade radio-interference signals.
Description of the drawings
Fig. 1 is apparatus of the present invention structure diagram；
Fig. 2 is apparatus of the present invention structure diagram；
Fig. 3 is the relation schematic diagram between radio environment Observational frequency band, observation simulation, calibration frequency band；
Fig. 4 is to realize promotion schematic diagram of the agile transceiver in aspect of performance based on agile transceiver.
Specific embodiment
The present invention is described in further detail, but the scope of the present invention is not limited to below by drawings and examples
The content.
Embodiment 1：As shown in Figure 1,3, it is received based on the radio spectral line observation system of agile transceiver including agile
Device, two power splitters, computer are sent out, agile transceiver is connect with computer, and agile transceiver is looked in the distance by two power splitters with radio
The analog receiver connection of mirror, the collected radio signal of acquisition Radio Telescope Antenna simultaneously form sight in agile transceiver
Acquisition channel is surveyed, while monitors the radio environment situation in observation frequency point or so frequency band, chooses the radio frequency line not interfered with
Band is used as the baseline frequency band of calibration and radio environment monitoring channel is formed in agile transceiver, which is received and dispatched based on agile
The platform of device AD9361, such as：NI2901 etc.；There are two input end of analog signal, agile transceivers for above-mentioned agile transceiver tool
Two input end of analog signal be connected respectively with two output ports of two power splitters, one of input terminal is adopted as observation
Collection channel is connected by two power splitters with radio telescope front end analogue receiver output terminal, another input terminal is as radio
The collection terminal of environmental monitoring channel is connected by two power splitters with the analog receiver output terminal of radio telescope；
Analog signal is filtered inside agile transceiver, is sent to computer after down coversion and acquisition quantization；
Computer is connected by USB or network with agile transceiver, is played control agile transceiver, is received from agile
Signal carries out further signal processing after the pretreatment of transceiver；
Computer is included with lower module：
Observe module, observation the stage for agile transceiver observation acquisition channel centre frequency ν, observation bandwidth w with
And the setting of spectral resolution N, centre frequency ν are set as spectral line observation frequency point, while it is logical to receive the observation acquisition of agile transceiver
The data that road is sent carry out FFT transform；Spectral line observation frequency point ± Δ ν Hz are respectively offset from dimensioning phase adjustment centre frequency ν, are seen
The wide w of measuring tape is constant, using calibration frequency band as data baseline；
Radio monitoring module, monitoring are used in the bandwidth of calibration with the presence or absence of radio interference, by acquiring in difference
Heart frequency point (ν ± Δs ν1, ν ± Δs ν2...) bandwidth is radio signal in the frequency band of W, it is relatively each logical after carrying out FFT transform
Difference in magnitude between road such as finds that, there are interference signal in the channel, which cannot function as data baseline, and selection does not have nothing
The frequency band of line electrical interference determines departure freqency Δ ν Hz, above-mentioned parameter is by computer through USB, cable etc. as calibration frequency band
Bus marco agile transceiver is set；
Memory module, for observing the preservation of data after data, radio environment monitoring data and calibration are handled.
First according to the relevant information of observed object, such as：The information such as spectral line frequency, red shift size, broadband, computer pair
The related of agile transceiver carries out parameter setting, including observation centre frequency ν, observation bandwidth W and spectral resolution N；
Then, channel measurement is monitored according to radio environment and obtains the band position for being suitble to calibration, in calibration in setting
The size delta ν that frequency of heart deviates；
In the data processor in being integrated in computer, digital signal is complete after the pretreatment sent to agile transceiver
Pairs of following digital signal processing：
1st, for observation acquisition channel acquisition, FFT transform, power spectrum conversion are carried out, preliminary observation data is formed and carries out
Storage；
2nd, for radio environment monitor channel, mainly by FFT transform after, determine without radio interference frequency band, and then
Determine the departure freqency Δ ν that centre frequency needs；
3rd, it after the centre frequency for observing acquisition channel being carried out positive and negative deviation, is calibrated in frequency band at two and carries out same work(
Rate spectrum conversion, forms calibration data, is carried out at the same time storage；
4th, preliminary observation data with two groups of calibration data are compared, eventually form data after calibration, and stored.
Calibration frequency band is determined by the identification of radio-interference signals：
The first step, it is assumed that the bandwidth of radio monitoring frequency band is B Hz, and needing the bandwidth observed, wherein B is long-range for W Hz
In W；It enables
(k is integer)；
Second step after N points FFT variations are carried out to bandwidth B, forms power spectrum sequence：(according to FFT central symmetries original
Reason)；
Third walks, and to the radio environment in sub- bandwidth B [0]~B [k] bandwidth, acquires first, the mean value of the sequence array
M and variances sigma；
4th step gradually traverses each frequency spectrum points of B [0]~B [k] with the difference of m compared with 3 times of σ, if more than being then determined as doing
Point is scrambled, is otherwise considered as noise frequency point；
5th step, for there is a situation where in subband interference, B [m] is defined as to the highest noise spot of sub- in-band frequency, then
Cycle performs third step, and sub- bandwidth B [m+1]~B [k+m+1] is investigated, the calibration frequency band until finding no radio interference
Until.
Embodiment 2：As shown in Figure 2,3, it is received based on the radio spectral line observation system of agile transceiver including agile
Device, radio monitoring antenna, radio monitoring receiver, computer are sent out, agile transceiver is connect with computer, agile transceiver
It is connect with the analog receiver of radio telescope and observation acquisition channel is formed in agile transceiver, radio monitoring antenna leads to
Radio monitoring receiver is crossed to connect with agile transceiver and form radio environment monitoring channel in agile transceiver；This is
Platform of the system based on agile transceiver AD9371, such as：NI2901 etc.；There are two analog signal inputs for above-mentioned agile transceiver tool
End, one of input terminal are connected as observation acquisition channel with the output of radio telescope front end analogue receiver, another is defeated
Enter end to connect as the collection terminal of radio environment monitoring channel and the output terminal of radio monitoring receiver；
Computer is included with lower module：
Radio monitoring module, monitoring are used in the bandwidth of calibration with the presence or absence of radio interference, by acquiring in difference
Heart frequency point bandwidth is the radio signal in the frequency band of W, and after carrying out FFT transform, the difference in magnitude between more each channel is chosen
There is no the frequency band of radio interference as calibration frequency band, determine departure freqency Δ ν Hz；
Observe module, observation the stage for agile transceiver observation acquisition channel centre frequency ν, observation bandwidth w with
And the setting of spectral resolution N, centre frequency ν are set as spectral line observation frequency point, while it is logical to receive the observation acquisition of agile transceiver
The data that road is sent carry out FFT transform；Spectral line observation frequency point ± Δ ν Hz are respectively offset from dimensioning phase adjustment centre frequency ν, are seen
The wide w of measuring tape is constant, using calibration frequency band as data baseline；
Memory module, for observing the preservation of data after data, radio environment monitoring data and calibration are handled.
Claims (3)
1. a kind of radio spectral line observation system based on agile transceiver, it is characterised in that：Including agile transceiver, two work(
Divide device, computer, agile transceiver is connect with computer, and agile transceiver is connect by the simulation of two power splitters and radio telescope
Receipts machine connects, and the radio signal that acquisition Radio Telescope Antenna receives simultaneously forms observation acquisition channel in agile transceiver,
The radio environment situation in observation frequency point or so frequency band is monitored simultaneously, is chosen the radio bands not interfered with and is used as calibration
Baseline frequency band simultaneously forms radio environment monitoring channel in agile transceiver.
2. a kind of radio spectral line observation system based on agile transceiver, it is characterised in that：Including agile transceiver, wirelessly
Pyroelectric monitor antenna, radio monitoring receiver, computer, agile transceiver are connect with computer, and agile transceiver is hoped with radio
The analog receiver connection of remote mirror simultaneously forms observation acquisition channel in agile transceiver, and radio monitoring antenna passes through radio
Monitoring receiver connect with agile transceiver and radio environment monitoring channel is formed in agile transceiver.
3. the radio spectral line observation system according to claim 1 or 2 based on agile transceiver, which is characterized in that
Computer is included with lower module：
Radio monitoring module, monitoring in the bandwidth of calibration for whether there is radio interference, by acquiring different center frequencies
Point bandwidth is the radio signal in the frequency band of W, and after carrying out FFT transform, the difference in magnitude between more each channel, selection does not have
The frequency band of radio interference determines departure freqency Δ ν Hz as calibration frequency band；
Module is observed, in the observation stage for centre frequency ν, observation bandwidth w and the frequency of agile transceiver observation acquisition channel
The setting of spectral resolution N, centre frequency ν are set as spectral line observation frequency point, while receive agile transceiver observation acquisition channel hair
The data come carry out FFT transform；Spectral line observation frequency point ± Δ ν Hz are respectively offset from dimensioning phase adjustment centre frequency ν, observe band
Wide w is constant, using calibration frequency band as data baseline；
Memory module, for observing the preservation of data after data, radio environment monitoring data and calibration are handled.
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| CN109888514A (en) * | 2019-04-01 | 2019-06-14 | 云南大学 | A kind of quick calibration radio telescope receiver and calibrating method |
| CN110187311A (en) * | 2019-05-15 | 2019-08-30 | 西安天伟电子系统工程有限公司 | Radar parameter configuration method, frequency source and radar system |
| CN113671249A (en) * | 2021-08-27 | 2021-11-19 | 中国科学院云南天文台 | Real-time omnibearing scanning radio environment monitoring system |
| CN115712056A (en) * | 2023-01-06 | 2023-02-24 | 法特迪精密科技（苏州）有限公司 | Chip temperature cycle aging test bench, key seat and test method |
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