CN103078688A - Method for calibrating delay inconsistency of radio star signal and spacecraft signal in interferometry - Google Patents
Method for calibrating delay inconsistency of radio star signal and spacecraft signal in interferometry Download PDFInfo
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Abstract
The invention discloses a method for calibrating delay inconsistency of a radio star signal and a spacecraft signal in interferometry. Very long baseline interferometry is to use a plurality of observation stations in different geographic positions to receive a signal from a same target in the space to be processed, time delay difference from the target to two observation stations with definite positions is calculated by utilizing relevant phase and observation frequency (or bandwidth), and calibration by utilizing a radio star is a main way for eliminating common error in the very long baseline interferometry. Therefore, in interferometry, the radio star signal and the spacecraft signal are transmitted through an identical route so as to guarantee the calibration accuracy. However, because of the reasons that the characteristics of the radio star signal and the spacecraft signal are different and for improving the utilization rate of equipment and reducing the quantitative loss of the spacecraft signal, different processing ways are adopted by a system for the two signals in measurement rather than the traditional identical processing way by which the radio star signal and the spacecraft signal are transmitted through different equipment routes, and the time delay difference of the two routes needs to be precisely determined to guarantee the calibration accuracy.
Description
Technical field
When the present invention's design is very long baseline interferometry(VLBI (VLBI) field radio star signal and spacecraft signal employing Different treatments, the inconsistent collimation technique of delaying time, the interference that is specially adapted to unlike signal in the deep space interferometry receives.
Background technology
When carrying out interferometry, the standard-required baseband-converted of VLBI is in full accord to the sample rate of same each passage of signal, quantization digit etc. with record.Because the radio star signal is that wide range is similar to white noise signal, amplitude a little less than; The spacecraft signal is generally narrow band signal, and amplitude is stronger, in order to reach identical precision, gather the broader bandwidth of radio star signal, and it is narrower to gather spacecraft signal Time Bandwidth; Gather the parameters such as the used sample rate of two kinds of signals, quantization digit also not identical.VLBI observation was mainly used in radio star in the past, and once identical sampling parameter is adopted in observation.When being applied to the spacecraft location, present method is the spacecraft signal to be adopted the processing method of radio star signal.The Internet Transmission bandwidth can be wasted like this, the requirement of orbit determination in real time can't be satisfied.
Summary of the invention
Technical problem to be solved by this invention is to utilize phase correction technique, with the delay inequality that radio star signal and spacecraft signal adopt the unlike signal processing mode to bring, measures in real time the requirement of satisfying real time signal processing in the deep space interferometry.
The object of the present invention is achieved like this:
Radio star signal and the inconsistent calibration steps of spacecraft signal time delay during a kind of interferometry is characterized in that may further comprise the steps:
1. when carrying out interferometry, antenna will be simultaneously or the radio star signal that receives of timesharing and the spacecraft signal coupler of putting front end through interlude be sent to and put; The calibrating signal generation unit is put phase correction signal by the field coupler also is sent to the field and puts;
2. be rivals in a contest radio star signal, spacecraft signal and the phase correction signal of input of field exports low-converter to after amplifying;
3. low-converter to the input amplification after radio star signal, spacecraft signal and phase correction signal down-convert to respectively intermediate-freuqncy signal, and be that radio star signal and the phase correction signal of intermediate frequency exports the first acquisition and recording device to frequency conversion, carry out A/D sampling, baseband-converted and record; Simultaneously, low-converter is that spacecraft signal and the phase correction signal of intermediate frequency exports the second acquisition and recording device to frequency conversion, carries out A/D sampling, baseband-converted and record;
4. signal processor carries out the discrete Fourier transform processing to the two paths of data of two acquisition and recording device outputs respectively, tries to achieve the phase place of phase alignment signal, obtains respectively the time-delay of two paths of signals through computing, and the delay inequality that namely obtains two paths of signals is subtracted each other in two time-delays.
2, radio star signal and the inconsistent calibration steps of spacecraft signal time delay during a kind of interferometry according to claim 1, it is characterized in that: step is the middle time-delay that obtains two paths of signals 4., the delay inequality that namely obtains two paths of signals is subtracted each other in two time-delays, specifically may further comprise the steps:
4.1, according to the frequency of each comb spectrum of phase alignment signal in the first acquisition and recording device, calculate the phase place of each comb spectrum by discrete Fourier transform;
4.2, suppose in the comb spectrum that the frequency of two adjacent discrete spectrums is respectively f
A1And f
A2, the phase place of obtaining by the DFT computing is respectively Φ
A1And Φ
A2, then signal through interlude put, the time-delay observed quantity of low-converter and the first acquisition and recording device is
Wherein π is circumference ratio;
4.3, according to the frequency of each comb spectrum of phase alignment signal in the second acquisition and recording device, calculate the phase place of each comb spectrum by discrete Fourier transform;
4.4, suppose in the comb spectrum that the frequency of two adjacent discrete spectrums is respectively f
B1And f
B2, the phase place of obtaining by the DFT computing is respectively Φ
B1And Φ
B2, then signal through interlude put, the time-delay observed quantity of low-converter and the first acquisition and recording device is
Wherein π is circumference ratio;
4.5 then the delay inequality of radio star signal and spacecraft signal is τ
2-τ
1
The present invention compares with background technology has following advantage:
1. the inconsistent calibration steps of radio star signal and spacecraft signal time delay adopts phase correction technique during interferometry of the present invention, does not disturb the reception of normal signal in calibration.
2. delay calibration signal processing method of the present invention can adapt to extremely low signal to noise ratio.
3. delay calibration technology of the present invention can realize high calibration accuracy, and calibration accuracy is better than 20ps.
4. delay calibration technology of the present invention possesses processing capability in real time.
Description of drawings
Fig. 1 is functional-block diagram of the present invention.
Fig. 2 is time domain waveform and the frequency-domain waveform figure of phase alignment signal.
Embodiment
With reference to Fig. 1, radio star signal and the inconsistent calibration steps of spacecraft signal time delay during a kind of interferometry is characterized in that may further comprise the steps:
1. when carrying out interferometry, antenna will be simultaneously or the radio star signal that receives of timesharing and the spacecraft signal coupler of putting front end through interlude be sent to and put; The calibrating signal generation unit is put phase correction signal by the field coupler also is sent to the field and puts;
2. be rivals in a contest radio star signal, spacecraft signal and the phase correction signal of input of field exports low-converter to after amplifying;
3. low-converter to the input amplification after radio star signal, spacecraft signal and phase correction signal down-convert to respectively intermediate-freuqncy signal, and be that radio star signal and the phase correction signal of intermediate frequency exports the first acquisition and recording device to frequency conversion, carry out A/D sampling, baseband-converted and record; Simultaneously, low-converter is that spacecraft signal and the phase correction signal of intermediate frequency exports the second acquisition and recording device to frequency conversion, carries out A/D sampling, baseband-converted and record;
4. signal processor carries out the discrete Fourier transform processing to the two paths of data of two acquisition and recording device outputs respectively, tries to achieve the phase place of phase alignment signal, obtains respectively the time-delay of two paths of signals through computing, and the delay inequality that namely obtains two paths of signals is subtracted each other in two time-delays.
2, radio star signal and the inconsistent calibration steps of spacecraft signal time delay during a kind of interferometry according to claim 1, it is characterized in that: step is the middle time-delay that obtains two paths of signals 4., the delay inequality that namely obtains two paths of signals is subtracted each other in two time-delays, specifically may further comprise the steps:
4.1, according to the frequency of each comb spectrum of phase alignment signal in the first acquisition and recording device, calculate the phase place of each comb spectrum by discrete Fourier transform;
4.2, suppose in the comb spectrum that the frequency of two adjacent discrete spectrums is respectively f
A1And f
A2, the phase place of obtaining by the DFT computing is respectively Φ
A1And Φ
A2, then signal through interlude put, the time-delay observed quantity of low-converter and the first acquisition and recording device is
Wherein π is circumference ratio;
4.3, according to the frequency of each comb spectrum of phase alignment signal in the second acquisition and recording device, calculate the phase place of each comb spectrum by discrete Fourier transform;
4.4, suppose in the comb spectrum that the frequency of two adjacent discrete spectrums is respectively f
B1And f
B2, the phase place of obtaining by the DFT computing is respectively Φ
B1And Φ
B2, then signal through interlude put, the time-delay observed quantity of low-converter and the first acquisition and recording device is
Wherein π is circumference ratio;
4.5 then the delay inequality of radio star signal and spacecraft signal is τ
2-τ
1
Claims (2)
1. radio star signal and the inconsistent calibration steps of spacecraft signal time delay during an interferometry is characterized in that may further comprise the steps:
1. when carrying out interferometry, antenna will be simultaneously or the radio star signal that receives of timesharing and the spacecraft signal coupler of putting front end through interlude be sent to and put; The calibrating signal generation unit is put phase correction signal by the field coupler also is sent to the field and puts;
2. be rivals in a contest radio star signal, spacecraft signal and the phase correction signal of input of field exports low-converter to after amplifying;
3. low-converter to the input amplification after radio star signal, spacecraft signal and phase correction signal down-convert to respectively intermediate-freuqncy signal, and be that radio star signal and the phase correction signal of intermediate frequency exports the first acquisition and recording device to frequency conversion, carry out A/D sampling, baseband-converted and record; Simultaneously, low-converter is that spacecraft signal and the phase correction signal of intermediate frequency exports the second acquisition and recording device to frequency conversion, carries out A/D sampling, baseband-converted and record;
4. signal processor carries out the discrete Fourier transform processing to the two paths of data of two acquisition and recording device outputs respectively, tries to achieve the phase place of phase alignment signal, obtains respectively the time-delay of two paths of signals through computing, and the delay inequality that namely obtains two paths of signals is subtracted each other in two time-delays.
2. radio star signal and the inconsistent calibration steps of spacecraft signal time delay during a kind of interferometry according to claim 1, it is characterized in that: step is the middle time-delay that obtains two paths of signals 4., the delay inequality that namely obtains two paths of signals is subtracted each other in two time-delays, specifically may further comprise the steps:
4.1, according to the frequency of each comb spectrum of phase alignment signal in the first acquisition and recording device, calculate the phase place of each comb spectrum by discrete Fourier transform;
4.2, suppose in the comb spectrum that the frequency of two adjacent discrete spectrums is respectively f
A1And f
A2, the phase place of obtaining by the DFT computing is respectively Φ
A1And Φ
A2, then signal through interlude put, the time-delay observed quantity of low-converter and the first acquisition and recording device is
Wherein π is circumference ratio;
4.3, according to the frequency of each comb spectrum of phase alignment signal in the second acquisition and recording device, calculate the phase place of each comb spectrum by discrete Fourier transform;
4.4, suppose in the comb spectrum that the frequency of two adjacent discrete spectrums is respectively f
B1And f
B2, the phase place of obtaining by the DFT computing is respectively Φ
B1And Φ
B2, then signal through interlude put, the time-delay observed quantity of low-converter and the first acquisition and recording device is
Wherein π is circumference ratio;
4.5 then the delay inequality of radio star signal and spacecraft signal is τ
2-τ
1
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441771A (en) * | 2013-08-26 | 2013-12-11 | 东南大学 | Linear phase correction method with broadband configurable channel |
| CN107766291A (en) * | 2017-09-15 | 2018-03-06 | 中国人民解放军63920部队 | A kind of method of remaining time delay in acquisition very long baseline interferometry(VLBI |
| CN109358699A (en) * | 2018-11-14 | 2019-02-19 | 中国人民解放军63920部队 | The bearing calibration of channel time delay and device in VLBI system |
| CN110430002A (en) * | 2018-04-30 | 2019-11-08 | 罗德施瓦兹两合股份有限公司 | For the system and method for broadband signal reversion radio channel |
| CN110940950A (en) * | 2019-11-28 | 2020-03-31 | 中国船舶重工集团公司第七一七研究所 | Difference slope stabilizing method |
| CN113281078A (en) * | 2021-06-10 | 2021-08-20 | 中国科学院上海天文台 | Universal signal simulation method for multi-target VLBI rail measurement verification |
| CN113406386A (en) * | 2021-06-23 | 2021-09-17 | 中国电子科技集团公司第二十九研究所 | Signal frequency accurate estimation method based on digital down-conversion |
| CN114911153A (en) * | 2022-03-31 | 2022-08-16 | 中国科学院国家授时中心 | Universal time UT1 determination method based on satellite-ground ultra-long baseline interferometry |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441771A (en) * | 2013-08-26 | 2013-12-11 | 东南大学 | Linear phase correction method with broadband configurable channel |
| CN107766291B (en) * | 2017-09-15 | 2020-11-06 | 中国人民解放军63920部队 | Method and computer equipment for obtaining residual time delay in very long baseline interferometry |
| CN107766291A (en) * | 2017-09-15 | 2018-03-06 | 中国人民解放军63920部队 | A kind of method of remaining time delay in acquisition very long baseline interferometry(VLBI |
| CN110430002B (en) * | 2018-04-30 | 2022-09-02 | 罗德施瓦兹两合股份有限公司 | System and method for inverting radio channel for wideband signal |
| CN110430002A (en) * | 2018-04-30 | 2019-11-08 | 罗德施瓦兹两合股份有限公司 | For the system and method for broadband signal reversion radio channel |
| CN109358699B (en) * | 2018-11-14 | 2021-07-02 | 中国人民解放军63920部队 | Method and device for correcting channel time delay in VLBI system |
| CN109358699A (en) * | 2018-11-14 | 2019-02-19 | 中国人民解放军63920部队 | The bearing calibration of channel time delay and device in VLBI system |
| CN110940950A (en) * | 2019-11-28 | 2020-03-31 | 中国船舶重工集团公司第七一七研究所 | Difference slope stabilizing method |
| CN113281078A (en) * | 2021-06-10 | 2021-08-20 | 中国科学院上海天文台 | Universal signal simulation method for multi-target VLBI rail measurement verification |
| CN113281078B (en) * | 2021-06-10 | 2023-10-27 | 中国科学院上海天文台 | Universal signal simulation method for multi-target VLBI rail measurement verification |
| CN113406386A (en) * | 2021-06-23 | 2021-09-17 | 中国电子科技集团公司第二十九研究所 | Signal frequency accurate estimation method based on digital down-conversion |
| CN114911153A (en) * | 2022-03-31 | 2022-08-16 | 中国科学院国家授时中心 | Universal time UT1 determination method based on satellite-ground ultra-long baseline interferometry |
| CN114911153B (en) * | 2022-03-31 | 2023-02-21 | 中国科学院国家授时中心 | Universal time UT1 determination method based on satellite-ground overlength baseline interferometry |
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