CN214224154U - Range finding simulator calibrating device based on PXI structure - Google Patents
Range finding simulator calibrating device based on PXI structure Download PDFInfo
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Abstract
The invention provides a PXI structure-based distance measurement simulator calibration device, wherein a PXI zero slot controller, a PXI vector signal generator board card and a signal analysis module are installed in a PXI case and are connected to a PXI bus, the PXI vector signal generator board card transmits an excitation signal required by a distance measurement simulator signal and enters a distance measurement simulator after passing through a circulator, the circulator connects out a response signal of the distance measurement simulator and enters the PXI signal analysis module, and meanwhile, the PXI vector signal generator board card transmits a trigger synchronization signal to the signal analysis module to serve as a reference of the excitation signal and the response signal. The invention has the advantages of light volume, convenient carrying, lower signal bottom noise in the measurement process, more accurate positioning of a half-amplitude point, higher accuracy of the measurement result, system volume saving, integration of the test function and improvement of the calibration accuracy, and is used for field test.
Description
Technical Field
The invention relates to the technical field of instrument measurement, in particular to an automatic calibration device which can be used for testing a ranging simulator.
Background
During debugging, inspection and field maintenance of the navigation equipment, the distance parameters must be calibrated by taking the ranging simulator as a standard so as to verify the performance index of the navigation equipment.
At present, when measuring distance delay parameters of a distance measurement simulator, a pulse power source and a digital oscilloscope are generally used to be combined with a circulator. A pulse power source is used for providing an excitation signal for the ranging simulator, a bi-directional coupler is used for coupling the excitation signal and a playback signal transmitted by the ranging simulator, and a digital oscilloscope measures time delay between the excitation signal and the playback signal. In the actual calibration process, because the digital oscilloscope is a radio frequency broadband acquisition system, the noise at the bottom of the digital oscilloscope is in the level of hundreds of microvolts, the dynamic range of measurement is very low, and when the amplitudes of an excitation signal and a playback signal are small, the accuracy is poor, and the requirement on the accuracy of calibration is difficult to meet.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a ranging simulator calibration device based on a PXI structure. The PXI bus-based system architecture saves the system volume, integrates the test function, improves the calibration accuracy and enables all parameters of the ranging simulator to be finally traced to the national standard.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a range finding simulator calibrating device based on a PXI structure comprises a PXI case (1), a PXI zero slot controller (2), a PXI vector signal generator board card (3), a signal analysis module (4) and a circulator (5); the PXI zero slot controller (2), the PXI vector signal generator board card (3) and the signal analysis module (4) are installed in the PXI case (1), the PXI zero slot controller (2), the PXI vector signal generator board card (3) and the signal analysis module (4) are all connected with a PXI bus, the PXI vector signal generator board card (3) transmits an excitation signal required by a distance measurement simulator signal and enters the distance measurement simulator after passing through the circulator (5), the circulator (5) connects out a response signal of the distance measurement simulator and enters the PXI signal analysis module (4), and meanwhile the PXI vector signal generator board card (3) transmits a trigger synchronization signal to the signal analysis module (4) to serve as a reference of the excitation signal and the response signal.
The pulse waveform of the excitation signal edited by the PXI vector signal generator board card (3) is as follows: the front edge width is less than 1.6 mu s (10-90% amplitude), and the front edge rises linearly from 0.05 amplitude to 0.3 amplitude; at the falling edge, the pulse width at the half-amplitude point is kept at 3.5 μ s, and the waveform is cos/cos2Shape, a periodic dipulse signal is transmitted.
The PXI signal analysis module (4) comprises a local vibration source board card, a down-conversion board card and an intermediate frequency digitization board card; the excitation signal is subjected to frequency mixing and down-conversion by the local vibration source board card and the down-conversion board card and then subjected to intermediate frequency acquisition by the intermediate frequency digital board card; when the response signal is collected, according to the characteristics of the response signal, signal collection is carried out at a position which deviates 63MHz from the center frequency of the excitation signal according to GJB 6277-2008.
The PXI zero slot controller (2) controls a PXI vector signal generator board card (3) and a PXI signal analysis module (4), sets the transmitting frequency and the transmitting level of the PXI vector signal generator board card (3), loads an edited excitation signal waveform into an IQ modulator of the PXI vector signal generator board card (3), sets the acquisition center frequency, the reference level, the sampling rate and the sampling point parameters of the PXI signal analysis module (4), performs waveform processing on the acquired excitation signal and response signal to obtain a measurement result, judges whether the technical index of the ranging simulator meets the requirement or not, and finally generates a test report.
The PXI vector signal generator board card (3) is a signal generator PXIE-5673E of NI company, a broadband modulator of the device has good phase balance, the background noise can reach-150 dBm/Hz, and the frequency domain integrity of a baseband signal generated by IQ modulation after modulation is finished is guaranteed.
The local oscillation source board card adopted in the PXI signal analysis module (4) is PXIe-5653 of NI company, and the local oscillation signal output by the equipment can reach 26.5 GHz; the adopted down-conversion board card is PXIe-5606 of NI company, the frequency conversion bandwidth of the device can reach 765MHz, and the radio frequency carrier frequency of frequency conversion reaches 26.5 GHz; the used intermediate frequency digital board card is PXIe-5624R of NI company, the sampling rate of the equipment can reach 2GHz, the digital resolution can reach 12 bits, and the integrity and the resolution of the acquired waveform are ensured.
When the excitation signal power required by the ranging simulator is larger than the maximum output power of the PXI vector signal generator board card (3), a power amplifier is added at the output port of the PXI vector signal generator board card (3), and the output power of the PXI vector signal generator board card (3) is improved.
The invention has the beneficial effects that:
1. the invention adopts the automatic control technology of the instrument to build a set of automatic calibration device, integrates a plurality of instruments into one PXI case, and simultaneously, the case contains a zero-slot controller, contains automatic test software, has light volume and convenient carrying, and can be used for field test.
2. The invention adopts the method of replacing radio frequency acquisition by intermediate frequency to complete the measurement of the signal, and the acquisition bandwidth used by the method is far narrower than the bandwidth acquired by the original oscilloscope, so the bottom noise of the signal is lower in the measurement process, the positioning of a half-amplitude point is more accurate, and the accuracy of the measurement result is higher.
3. Because a frequency difference of 63MHz exists between the frequencies of the excitation signal and the response signal, the acquisition bandwidth for directly and simultaneously acquiring the two paths of signals is at least 63MHz, the method adopts a method taking the synchronous signal as a reference to measure, respectively measures the delay time difference between the excitation signal, the response signal and the synchronous signal, does not need to simultaneously cover the two paths of signals by the acquisition bandwidth, only needs to cover the bandwidth of the single path of signal, can compress the bottom noise to be lower, and further improves the measurement accuracy.
Drawings
FIG. 1 is a system test connection diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention aims to provide a calibration device for a ranging simulator, aiming at the defects of the prior art, the system is based on a PXI bus system architecture, the system volume is saved, the test function is integrated, the calibration accuracy is improved, and all parameters of the ranging simulator can be finally traced to the national standard.
In order to achieve the above object, as shown in fig. 1, the present invention includes: the system comprises a PXI case (1), a PXI zero slot controller (2), a PXI vector signal generator board card (3), a signal analysis module (4) and a circulator (5).
The PXI vector signal generator board card (3) is responsible for transmitting an excitation signal required by a ranging simulator signal, and the pulse waveform of the excitation signal of the PXI vector signal generator board card (3) is edited, wherein the leading edge width is less than 1.6 mu s (10% -90% of amplitude), and the amplitude rises linearly from 0.05 to 0.3; at the falling edge, the pulse width at the half-amplitude point is kept at 3.5 μ s, and the waveform is cos/cos2Shape, a periodic dipulse signal is transmitted. In practical application, when the excitation signal power required by the ranging simulator is larger than the maximum output power of the PXI vector signal generator board card (3), a power amplifier is added at an output port, and the output power of the PXI vector signal generator board card (3) is increased. Meanwhile, the PXI vector signal generator board card (3) transmits a trigger synchronization signal to the PXI vector signal generator board card (3) to be used as a reference for the excitation signal and the response signal.
The PXI signal analysis module (4) comprises a local vibration source board card, a down-conversion board card and an intermediate frequency digital board card. The excitation signal is subjected to frequency mixing and down-conversion by the local vibration source board card and the down-conversion board card, and then is subjected to intermediate frequency acquisition by the intermediate frequency digital board card. When the response signal is collected, according to the characteristics of the response signal, the signal is collected at a position which deviates from the center frequency of the excitation signal by 63MHz according to GJB 6277-2008.
The PXI zero slot controller (2) is responsible for controlling the PXI vector signal generator board card (3) and the PXI signal analysis module (4), setting the transmitting frequency and the transmitting level of the PXI vector signal generator board card (3), and loading the edited excitation signal waveform into an IQ modulator of the PXI vector signal generator board card (3). The acquisition center frequency, the reference level, the sampling rate and the sampling point parameters of the PXI signal analysis module (4) are set, waveform processing is carried out on the acquired excitation signal and the acquired response signal to obtain a measurement result, whether the technical index of the ranging simulator meets the requirement or not is judged, and finally a test report is generated.
And the circulator (5) is responsible for connecting the response signal of the ranging simulator out and entering the PXI signal analysis module (4).
The calibration method is used for measuring the distance delay of the ranging simulator, and the technical scheme adopted for solving the problems comprises the following steps:
the first step is as follows: according to the connection device shown in the figure 1, a radio frequency output port of a PXI vector signal generator board card (3), a radio frequency input port of a signal analysis module (4) and a radio frequency port of a ranging simulator are connected with a ring-shaped device (5), and a trigger output port of the PXI vector signal generator board card (3) is connected with a trigger input port of the signal analysis module (4).
The second step is as follows: and a PXI zero slot controller (2) is used for controlling a PXI vector signal generator board card (3) to output an excitation signal meeting the distance measurement requirement.
The third step: setting the center frequency point of the analysis of the signal analysis module (4) as the center frequency of the excitation signal, setting the middle frequency bandwidth in the range of 1MHz to 10MHz, collecting the excitation signal, measuring the time delay t from the half amplitude point of the rise time of the excitation signal to the trigger synchronous signal1。
The fourth step: setting the center frequency point of the analysis of the signal analysis module (4) as the center frequency of the response signal of the ranging simulator, setting the intermediate frequency bandwidth in the range of 1MHz to 10MHz, collecting the response signal, measuring the time delay t from the half amplitude point of the rise time of the response signal to the trigger synchronous signal2。
The fifth step: calculating the time delay delta t between the response signal and the excitation signal as t2-t1。
A sixth step: converting delay time into distance parameter S ═ electromagnetic wave transmissionVelocity V ([ Delta ] t-intrinsic delay t)0) /2, where the inherent delay t0The delay existing when the distance of the simulator is 0 is a fixed value according to different modes.
The PXI vector signal generator board card (3) is a signal generator PXIE-5673E of NI company, a broadband modulator of the device has good phase balance, the background noise can reach-150 dBm/Hz, and the frequency domain integrity of a baseband signal generated by IQ modulation after modulation is finished is guaranteed.
The local oscillation source board card used in the PXI signal analysis module (4) is PXIe-5653 of NI company, and the local oscillation signal output by the equipment can reach 26.5 GHz. The used down-conversion board card is PXIe-5606 of NI company, the frequency conversion bandwidth of the device can reach 765MHz, and the radio frequency carrier frequency of frequency conversion can reach 26.5 GHz. The used intermediate frequency digital board card is PXIe-5624R of NI company, the sampling rate of the equipment can reach 2GHz, the digital resolution can reach 12 bits, and the integrity and the resolution of the acquired waveform are ensured. Fig. 1 shows a system test connection diagram of the present invention, a radio frequency output port of a PXI vector signal generator board card (3), a radio frequency input port of a signal analysis module (4), and a radio frequency port of a ranging simulator are connected with three ports of a circulator (5), a trigger output port of the PXI vector signal generator board card (3) is connected to a trigger input port of the signal analysis module (4), a PXI zero slot controller (2), the PXI vector signal generator board card (3), and the signal analysis module (4) are integrated in a PXI chassis, and the PXI zero slot controller (2) controls the PXI vector signal generator board card (3) and the signal analysis module (4) through a PXI bus.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (7)
1. A range finding simulator calibrating device based on PXI structure, includes PXI quick-witted case (1), PXI zero slot controller (2), PXI vector signal generator board card (3), signal analysis module (4) and circulator (5), its characterized in that:
the PXI zero slot controller (2), the PXI vector signal generator board card (3) and the signal analysis module (4) are installed in the PXI case (1), the PXI zero slot controller (2), the PXI vector signal generator board card (3) and the signal analysis module (4) are all connected with a PXI bus, the PXI vector signal generator board card (3) transmits an excitation signal required by a distance measurement simulator signal and enters the distance measurement simulator after passing through the circulator (5), the circulator (5) connects out a response signal of the distance measurement simulator and enters the PXI signal analysis module (4), and meanwhile the PXI vector signal generator board card (3) transmits a trigger synchronization signal to the signal analysis module (4) to serve as a reference of the excitation signal and the response signal.
2. The PXI-based ranging simulator calibration apparatus of claim 1, wherein:
the pulse waveform of the excitation signal edited by the PXI vector signal generator board card (3) is as follows: the width of the front edge is less than 1.6 mu s, and the front edge linearly rises from 0.05 amplitude to 0.3 amplitude; at the falling edge, the pulse width at the half-amplitude point is kept at 3.5 μ s, and the waveform is cos/cos2Shape, a periodic dipulse signal is transmitted.
3. The PXI-based ranging simulator calibration apparatus of claim 1, wherein:
the PXI signal analysis module (4) comprises a local vibration source board card, a down-conversion board card and an intermediate frequency digitization board card; the excitation signal is subjected to frequency mixing and down-conversion by the local vibration source board card and the down-conversion board card and then subjected to intermediate frequency acquisition by the intermediate frequency digital board card; when the response signal is collected, according to the characteristics of the response signal, signal collection is carried out at a position which deviates 63MHz from the center frequency of the excitation signal according to GJB 6277-2008.
4. The PXI-based ranging simulator calibration apparatus of claim 1, wherein:
the PXI zero slot controller (2) controls a PXI vector signal generator board card (3) and a PXI signal analysis module (4), sets the transmitting frequency and the transmitting level of the PXI vector signal generator board card (3), loads an edited excitation signal waveform into an IQ modulator of the PXI vector signal generator board card (3), sets the acquisition center frequency, the reference level, the sampling rate and the sampling point parameters of the PXI signal analysis module (4), performs waveform processing on the acquired excitation signal and response signal to obtain a measurement result, judges whether the technical index of the ranging simulator meets the requirement or not, and finally generates a test report.
5. The PXI-based ranging simulator calibration apparatus of claim 1, wherein:
the PXI vector signal generator board card (3) is a signal generator PXIE-5673E of NI company, the background noise can reach-150 dBm/Hz, and the frequency domain integrity of the baseband signal generated by IQ modulation after modulation is finished is guaranteed.
6. The PXI-based ranging simulator calibration apparatus of claim 1, wherein:
the local oscillation source board card adopted in the PXI signal analysis module (4) is PXIe-5653 of NI company, and the local oscillation signal output by the equipment can reach 26.5 GHz; the adopted down-conversion board card is PXIe-5606 of NI company, the frequency conversion bandwidth of the device can reach 765MHz, and the radio frequency carrier frequency of frequency conversion reaches 26.5 GHz; the used intermediate frequency digital board card is PXIe-5624R of NI company, the sampling rate of the equipment can reach 2GHz, the digital resolution can reach 12 bits, and the integrity and the resolution of the acquired waveform are ensured.
7. The PXI-based ranging simulator calibration apparatus of claim 1, wherein:
when the excitation signal power required by the ranging simulator is larger than the maximum output power of the PXI vector signal generator board card (3), a power amplifier is added at the output port of the PXI vector signal generator board card (3), and the output power of the PXI vector signal generator board card (3) is improved.
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| CN114088978A (en) * | 2021-11-16 | 2022-02-25 | 中国电子科技集团公司第二十研究所 | PXI structure-based calibration method and device for TACAN signal speed parameters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114088978A (en) * | 2021-11-16 | 2022-02-25 | 中国电子科技集团公司第二十研究所 | PXI structure-based calibration method and device for TACAN signal speed parameters |
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