CN106911408B - Calibration method for calibrating time delay of forwarding cluster - Google Patents
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Abstract
A calibration method for calibrating the time delay of a forwarding cluster comprises the following steps: the initial delay of the system is scaled. Generating two paths of pulse signals with the same frequency and the same phase by using an arbitrary waveform generator, wherein one path of pulse signal is used as a modulation signal to perform pulse modulation on a microwave signal generator to generate a pulse modulation signal, outputting a video pulse signal after being detected by a microwave detector, and then inputting the video pulse signal into a digital oscilloscope; the other path of pulse signal is used as a trigger signal and is also input into the digital oscilloscope; measuring the delay time of the video pulse signal delay pulse signal by using a digital oscilloscope, wherein the delay time is the initial delay time of the calibration system
. The second step is that: the system delay after the transponder is scaled. The third step: the initial delay of the calibration system is subtracted from the system delay after calibration of the transponder, namely the delay time introduced by the transponder, and the transponder delay time calibration at different carrier frequency frequencies is carried out within the working frequency bandwidth of the signal transponder by adopting the method.
Description
Technical Field
The invention belongs to the field of national defense military radio electronics, and particularly relates to a calibration method for calibrating time delay of a forwarding cluster.
Background
With the development of communication technology and engineering application, radio signals require longer and longer transmission distance, a transmitting end and a receiving end cannot be directly interconnected, and long-distance signal transmission must be realized through signal forwarding, namely, the signal forwarding machine is used for realizing the forwarding of the radio signals. The signal transponder has application fields of being between ground stations, satellites, ground stations and satellites and the like. However, when the signal repeater realizes the radio signal repeating, the delay of the signal is caused, and the delay is not a dust-free constant, but an irregular delay effect is generated along with the change of the frequency, so that the delay of the signal repeater can be regarded as a group delay, and different delay responses exist for different frequencies.
According to the principle of the signal transponder, after the signal transponder receives a signal, the signal is transmitted through a series of circuits such as signal amplification, frequency mixing, filtering, amplification and the like. In the process of signal forwarding, besides the amplitude-frequency characteristic of the signal repeater, the most concerned technical index is the group delay of the signal repeater, and the group delay is directly related to the time sequence and the receiving performance of signal receiving, so that how to solve the calibration problem of calibrating the group delay of the repeater becomes a technical difficulty.
Disclosure of Invention
Aiming at the problem of group delay calibration of the signal transponder, the invention aims to solve the technical problem of realizing the calibration of the forwarding group delay of the signal transponder by calibrating the initial delay of a calibration system by utilizing the block edge measurement capability and the signal triggering capability of a digital oscilloscope.
In order to solve the above technical problem, the calibration method for calibrating the time delay of a forwarding cluster provided by the present invention comprises the following steps: the first step is as follows: initial delay of the calibration system; two paths of pulse signals with the same frequency and the same phase are generated by utilizing an arbitrary waveform generator, wherein one path of pulse signal is used as a modulation signal to carry out pulse modulation on a microwave signal generator to generate a pulse modulation signal, and the pulse modulation signal is detected by a microwave detector to output a video pulse signal and then outputEntering a digital oscilloscope; the other path of pulse signal is used as a trigger signal and is also input into the digital oscilloscope; measuring the delay time of the video pulse signal delay pulse signal by using a digital oscilloscope, wherein the delay time is the initial delay time of the calibration system
(ii) a The second step is that: calibrating the system delay after the system delay passes through the transponder; the third step: and subtracting the initial delay of the calibration system from the system delay after the calibration of the repeater, namely the delay time introduced by the repeater.
Further, the second step specifically comprises: generating two paths of pulse signals with the same frequency and the same phase by using an arbitrary waveform generator, wherein one path of pulse signal is used as the external pulse modulation frequency of a radio frequency signal to generate a radio frequency signal, inputting the radio frequency signal into a signal repeater, outputting a video pulse signal after the retransmitted signal is detected by a microwave detector, and then inputting the video pulse signal into a digital oscilloscope; the other path of pulse signal is used as a trigger signal and is also input into the digital oscilloscope; measuring the delay time of the video pulse signal delay pulse signal by using a digital oscilloscope, wherein the delay time is the system delay time after the system delay time is calibrated and passes through a repeater
。
Further, the third step calculates the delay time of the repeater by using a formula:
by adopting the method, the group delay of the transponder can be obtained by calibrating the delay time of the transponder at different carrier frequency within the working frequency bandwidth of the signal transponder, and the characteristic that the delay time changes along with the frequency is formed.
Compared with the prior art, the calibration method for calibrating the time delay of the repeater group utilizes the pulse modulation detection characteristic, the multi-type signal trigger characteristic of the digital oscilloscope and the fast edge measurement capability of the digital oscilloscope, adopts the calibration method for calibrating the time delay characteristic of the repeater by the black box method, and is low in cost, easy to operate and suitable for external field test.
Drawings
Fig. 1 is a schematic diagram of a forwarding cluster delay calibration process according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and specific examples. These examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure in any way whatsoever. After reading the description of the invention, one skilled in the art can make various changes and modifications to the invention, and such equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Fig. 1 shows a schematic diagram of a calibration process of forwarding cluster delay in actual operation according to the calibration method for calibrating the forwarding cluster delay provided by the present invention. The method comprises the following specific steps:
the first step is as follows: the initial delay of the system is scaled. Generating two paths of pulse signals with the same frequency and the same phase by using an arbitrary waveform generator, wherein one path of pulse signal is used as a modulation signal to perform pulse modulation on a microwave signal generator to generate a pulse modulation signal, outputting a video pulse signal after being detected by a microwave detector, and then inputting the video pulse signal into a digital oscilloscope; the other path of pulse signal is used as a trigger signal and is also input into the digital oscilloscope; measuring the delay time of the video pulse signal delay pulse signal by using a digital oscilloscope, wherein the delay time is the initial delay time of the calibration system
。
The second step is that: the system delay after the transponder is scaled. Generating two paths of pulse signals with the same frequency and the same phase by using an arbitrary waveform generator, wherein one path of pulse signal is used as the external pulse modulation frequency of a radio frequency signal to generate a radio frequency signal, inputting the radio frequency signal into a signal repeater, outputting a video pulse signal after the retransmitted signal is detected by a microwave detector, and then inputting the video pulse signal into a digital oscilloscope; the other path of pulse signal is used as a trigger signal and is also input into the digital oscilloscope; number of usingThe word oscilloscope measures the delay time of the video pulse signal delay pulse signal, and the delay time is the system delay time after the system delay time is calibrated and passes through the repeater
。
The third step: subtracting the initial delay of the calibration system from the system delay after the calibration of the repeater, namely the delay time introduced by the repeater, and calculating the delay time of the repeater by using a formula:
by adopting the method, the group delay of the transponder can be obtained by calibrating the delay time of the transponder at different carrier frequency within the working frequency bandwidth of the signal transponder, and the characteristic that the delay time changes along with the frequency is formed.
Claims (2)
1. A calibration method for calibrating the time delay of a forwarding cluster is characterized by comprising the following steps:
the first step is as follows: initial delay of the calibration system;
generating two paths of pulse signals with the same frequency and the same phase by using an arbitrary waveform generator, wherein one path of pulse signal is used as a modulation signal to perform pulse modulation on a microwave signal generator to generate a pulse modulation signal, outputting a video pulse signal after being detected by a microwave detector, and then inputting the video pulse signal into a digital oscilloscope; the other path of pulse signal is used as a trigger signal and is also input into the digital oscilloscope; measuring the delay time of the video pulse signal delay pulse signal by using a digital oscilloscope, wherein the delay time is the initial delay time tau of the calibration system0；
The second step is that: calibrating the system delay after the system delay passes through the transponder;
the second step is specifically as follows: two paths of pulse signals with the same frequency and the same phase are generated by utilizing an arbitrary waveform generator, wherein one path of pulse signal is used as the external pulse modulation frequency of the video pulse signal in the first step to generate a radio frequency signal, and the radio frequency signal is input to a signal transponderThe forwarded signal is detected by a microwave detector and then a video pulse signal is output and then input into a digital oscilloscope; the other path of pulse signal is used as a trigger signal and is also input into the digital oscilloscope; measuring the delay time of the video pulse signal delay pulse signal by using a digital oscilloscope, wherein the delay time is the system delay time tau after the system delay time is calibrated and passes through a transponder1；
The third step: and subtracting the initial delay of the calibration system from the system delay after the calibration of the repeater, namely the delay time introduced by the repeater.
2. The calibration method according to claim 1, wherein the calibration method comprises: and the third step, calculating the delay time of the repeater by using a formula:
τ＝τ1-τ0 (1)
by adopting the method, the calibration of the delay time of the transponder at different carrier frequency is carried out in the working frequency bandwidth of the signal transponder, so that the group delay of the transponder is obtained, and the characteristic that the delay time changes along with the frequency is formed.
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| CN111064532B (en) * | 2019-12-23 | 2022-08-12 | 北京航天益森风洞工程技术有限公司 | Transmission delay test method and system for unmanned platform remote control and remote measurement data system |
| CN111580137B (en) * | 2020-05-18 | 2022-04-22 | 中国人民解放军国防科技大学 | Fitting method for high-precision navigation receiver radio frequency channel group delay characteristics |
| CN111751711B (en) * | 2020-06-30 | 2023-03-24 | 贵州航天电子科技有限公司 | Carrier transmission delay testing method and system based on 2FSK modulation |
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| CN101799317A (en) * | 2009-12-29 | 2010-08-11 | 武汉艾立卡电子有限公司 | Measuring method of technical parameters of delay-type audio devices of electrophone |
| US7868607B2 (en) * | 2007-04-20 | 2011-01-11 | Agilent Technologies, Inc. | Test method for frequency converters with embedded local oscillators |
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| US7868607B2 (en) * | 2007-04-20 | 2011-01-11 | Agilent Technologies, Inc. | Test method for frequency converters with embedded local oscillators |
| CN101799317A (en) * | 2009-12-29 | 2010-08-11 | 武汉艾立卡电子有限公司 | Measuring method of technical parameters of delay-type audio devices of electrophone |
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