CN103516451A - RF system group delay parameter measuring method - Google Patents
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Abstract
The invention discloses an RF system group delay parameter measuring method which comprises the steps as follows: the moving contact of a single-pole double-throw switch is combined with a first fixed terminal; a first pulse signal is sent to a first analog-digital converter through a pulse signal generator, and a second pulse signal is sent to a modulator through the pulse signal generator; a first carrier signal is sent to the modulator through a first RF source; the second pulse signal is modulated into the first carrier signal through the modulator; a signal with a new time delay is demodulated through a square law detector; a first synchronous sampling clock signal is sent to a power divider through a second RF source, and the first synchronous sampling clock signal from the second RF source is divided into two paths through the power divider. The measuring method utilizes the square law detector to demodulate a modulated signal, so as to avoid the introducing errors and improve the measuring accuracy which is better than 1 ns. The applicable frequency range of the measuring method is 100 MHz-50 GHz.
Description
Technical field
The present invention relates to the field of measuring technique of radio system group delay parameter, particularly a kind of method of measurement of radio system group delay parameter.
Background technology
Group delay is for describing the physical quantity of the phase-frequency characteristic of signal transmission system, is one of important performance indexes of transmission system.Due to the restriction of self physical characteristic of radio system, inevitably there is phase dispersion in radio system, and this phase dispersion causes the variation of group delay parameter on different frequent points, thereby the signal transmitting in radio system is exerted an influence.Therefore, the group delay parameter of Measurement accuracy radio system on different frequent points, significant to determining the performance index of whole radio system.
In prior art, for the method for group delay parameter measurement, comprise and vow net method and the large class of modulation method two.
Vow that net method, conventionally based on vector network analyzer, obtains the phase-frequency response curve of radio system to be measured by stepping frequency sweep, then by difference and interpolation calculation, obtain the group delay parameter of this radio system to be measured.The advantage of vowing net method is that certainty of measurement is higher, but vows that the cost of net method is higher, and vows that net method is not suitable for the measurement of the group delay parameter of frequency conversion system.
Modulation method is inputted modulation signal radio system to be measured conventionally, and the mode by demodulation obtains modulation intelligence from modulation signal, then modulation intelligence and raw information is carried out to time delay and relatively obtains the group delay parameter of this radio system to be measured under this operating state.Modulation method can be removed the impact of carrier wave, so its frequency scope of application is wider, and stability is higher during the frequency conversion system in measuring radio system.In addition, the measurement mechanism that modulation method is used is simple in structure, measures efficient and convenient.
In prior art, modulation method further comprises three kinds of Sine Modulated phase demodulation method, pulse modulation peak value comparison method and BPSK (Binary Phase Shift Keying) receiver methods.Wherein, Sine Modulated phase demodulation method obtains the time delay of modulation intelligence and raw information by phase demodulation, so Sine Modulated phase demodulation method is subject to the impact of multipath reflection in radio system to be measured, and its certainty of measurement is lower; Pulse modulation peak value comparison method is by first peak detection, then relatively the peak value of modulating pulse is determined time delay, therefore between the certainty of measurement of pulse modulation peak value comparison method and measurement aperture, there is contradiction, be difficult to the curve fluctuation of the group delay parameter of accurately reflection radio system to be measured; The structure of the measurement mechanism that BPSK receiver method is used is more complicated, cannot calibrate, and be difficult to improve certainty of measurement by reprocessing.
Summary of the invention
The object of the invention is the above-mentioned defect for prior art, a kind of measurement mechanism of radio system group delay parameter is provided.
The method of measurement of radio system group delay parameter provided by the invention comprises the steps:
The moving contact of single-pole double-throw switch (SPDT) is closed to the first motionless terminal, make modulator and radio system to be measured form signal path;
By pulse signal generator, to the first analog to digital converter, send the first pulse signal, by pulse signal generator, to modulator, send the second pulse signal, and the second pulse signal is identical with the first pulse signal; Between the second pulse signal and the first pulse signal, there is the first fixing original time delay; By the first radio frequency source, to modulator, send first carrier signal;
By modulator, the second pulse signal modulation from pulse signal generator is sent to square law wave detector through single-pole double-throw switch (SPDT) and radio system to be measured successively in the first carrier signal from the first radio frequency source and by the signal after modulation, and the time delay new with respect to first via pulse signal genration of the signal after radio system to be measured;
By square law wave detector, the signal from the new time delay of having of radio system to be measured is carried out demodulation and the signal after demodulation is sent to the second analog to digital converter;
By the second radio frequency source, to power splitter, send the first synchronized sampling clock signal, by power splitter, the first synchronized sampling clock signal from the second radio frequency source is divided into two-way and this two-way first synchronized sampling clock signal is sent to respectively to the first analog to digital converter and the second analog to digital converter;
The first analog to digital converter and the second analog to digital converter are sampled after receiving the first synchronized sampling clock signal, the first analog to digital converter receive after the first synchronized sampling clock signal to from the first pulse signal of pulse signal generator, sample and sampled signal is converted to digital signal after be sent to post-processing module; The second analog to digital converter receive the signal after the demodulation from square law wave detector is sampled after the first synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module;
Utilize post-processing module to pass through relatively to obtain signal after demodulation and the relative time delay between the first pulse signal;
The moving contact of single-pole double-throw switch (SPDT) is closed to the second motionless terminal, make to form signal path between modulator and square law wave detector;
By pulse signal generator, to the first analog to digital converter, send the 3rd pulse signal, by pulse signal generator, to modulator, send the 4th pulse signal, and the 3rd pulse signal is all identical with the first pulse signal with the 4th pulse signal; Between the 4th pulse signal and the 3rd pulse signal, have the second fixing original time delay, and the second original time delay is identical with the first original time delay; By the first radio frequency source, to modulator, send the second carrier signal;
By modulator, the 4th pulse signal modulation from pulse signal generator is sent to square law wave detector through single-pole double-throw switch (SPDT) in the second carrier signal from the first radio frequency source and by the signal after modulation;
Signal after utilizing square law wave detector to the modulation from modulator carries out demodulation and the signal after demodulation is sent to the second analog to digital converter;
By the second radio frequency source, to power splitter, send the second synchronized sampling clock signal, by power splitter, the second synchronized sampling clock signal from the second radio frequency source is divided into two-way and this two-way second synchronized sampling clock signal is sent to respectively to the first analog to digital converter and the second analog to digital converter;
The first analog to digital converter receive after the second synchronized sampling clock signal to from the 3rd pulse signal of pulse signal generator, sample and sampled signal is converted to digital signal after be sent to post-processing module; The second analog to digital converter receive the signal after the demodulation from square law wave detector is sampled after the second synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module;
Utilize post-processing module to pass through relatively to obtain the error time delay of radio system to be measured;
By the described error time delay that deducts radio system to be measured described relative time delay, obtain the group delay parameter of radio system to be measured.
Preferably, the sampling of the sampling of described the first analog to digital converter and described the second analog to digital converter is carried out simultaneously.
Preferably, described the second carrier signal is identical with the frequency of described first carrier signal.
The present invention has following beneficial effect:
(1) signal after method of measurement of the present invention utilizes square law wave detector to modulation carries out demodulation, and it is simple in structure, can avoid introducing error, thereby improves certainty of measurement, and its certainty of measurement is better than 1ns;
(2) method of measurement of the present invention utilizes pulse signal generator to produce pattern and the controlled pulse signal of bit rate, makes measurement aperture and the Measuring Time of group delay parameter adjustable;
(3) method of measurement of the present invention utilizes single-pole double-throw switch (SPDT) to realize the switching of the signal path of modulator output, and measuring process is simplified;
(4) the applicable frequency range of method of measurement of the present invention is 100MHz-50GHz.
Accompanying drawing explanation
The structural representation of the measurement mechanism that the method for measurement of the radio system group delay parameter that Fig. 1 provides for the embodiment of the present invention adopts.
Embodiment
Below in conjunction with drawings and Examples, summary of the invention of the present invention is further described.
Embodiment 1
The measurement mechanism that the method for measurement of the radio system group delay parameter that as shown in Figure 1, the present embodiment provides adopts comprises pulse signal generator 1, modulator 2, the first radio frequency source 3, single-pole double-throw switch (SPDT) 4, square law wave detector 5, the second radio frequency source 6, power splitter 7, the first analog to digital converter 8, the second analog to digital converter 9 and post-processing module 10.Single-pole double-throw switch (SPDT) 4 comprises the first motionless terminal 402 of motionless terminal 401, second and moving contact 403.
Two outputs of pulse signal generator 1 are electrically connected to an input of modulator 2 and an input of the first analog to digital converter 8 respectively.The first radio frequency source 3 outputs are electrically connected to modulator 2 another inputs.The output of modulator 2 is electrically connected to the moving contact of single-pole double-throw switch (SPDT) 4.The first motionless terminal 401 of single-pole double-throw switch (SPDT) 4 is electrically connected to the input of radio system 11 to be measured.The second motionless terminal 402 of single-pole double-throw switch (SPDT) 4 is electrically connected to an input of square law wave detector 5.The output of radio system 11 to be measured is electrically connected to another input of square law wave detector 5.The output of square law wave detector 5 is electrically connected to an input of the second analog to digital converter 9.The second radio frequency source 6 outputs are electrically connected to the input of power splitter 7.Two outputs of power splitter 7 are electrically connected to another input of the first analog to digital converter 8 and another input of the second analog to digital converter 9 respectively.Two inputs of post-processing module 10 are the output of the first analog to digital converter 8 and the electrical connection of the output of the second analog to digital converter 9 respectively.
In the present embodiment, the operating frequency of square law wave detector 5 is 10MHz-50GHz.The sample rate of the first analog to digital converter 8 and the second analog to digital converter 9 is all more than or equal to 2GSa/s; And the quantization digit of the first analog to digital converter 8 and the second analog to digital converter 9 is all more than or equal to 8.
The method of measurement of the radio system group delay parameter that the present embodiment provides comprises the steps:
S1: the moving contact of single-pole double-throw switch (SPDT) 4 is closed to the first motionless terminal 401, make modulator 2 and radio system 11 to be measured form signal path;
S2: send the first pulse signal by pulse signal generator 1 to the first analog to digital converter 8, send the second pulse signal by pulse signal generator 1 to modulator 2, and the second pulse signal is identical with the first pulse signal; Between the second pulse signal and the first pulse signal, there is the first fixing original time delay; By the first radio frequency source 3, to modulator 2, send first carrier signal; In the present embodiment, for example the first original time delay is different the causing of transmission path by the first pulse signal and the second pulse signal;
S3: the second pulse signal modulation from pulse signal generator 1 is sent to square law wave detector 5 through single-pole double-throw switch (SPDT) 4 and radio system to be measured 11 successively in the first carrier signal from the first radio frequency source 3 and by the signal after modulation by modulator 2, and the time delay that the signal after radio system 11 to be measured is new with respect to first via pulse signal genration, this new time delay is different from the first original time delay and the second original time delay;
S4: the signal by 5 pairs, square law wave detector from the new time delay of having of radio system 11 to be measured carries out demodulation and the signal after demodulation is sent to the second analog to digital converter 9;
S5: send the first synchronized sampling clock signal by the second radio frequency source 6 to power splitter 7, by power splitter 7, the first synchronized sampling clock signal from the second radio frequency source 6 is divided into two-way and this two-way first synchronized sampling clock signal is sent to respectively to the first analog to digital converter 8 and the second analog to digital converter 9;
S6: the first analog to digital converter 8 receive after the first synchronized sampling clock signal to from the first pulse signal of pulse signal generator 1, sample and sampled signal is converted to digital signal after be sent to post-processing module 10; The second analog to digital converter 9 receive the signal after the demodulation from square law wave detector 5 is sampled after the first synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module 10; In the present embodiment, the sampling of the sampling of the first analog to digital converter 8 and the second analog to digital converter 9 is carried out simultaneously;
S7: utilize post-processing module 10 by relatively obtaining signal after demodulation and the relative time delay between the first pulse signal;
S8: the moving contact of single-pole double-throw switch (SPDT) 4 is closed to the second motionless terminal 402, make to form signal path between modulator 2 and square law wave detector 5;
S9: send the 3rd pulse signal by pulse signal generator 1 to the first analog to digital converter 8, send the 4th pulse signal by pulse signal generator 1 to modulator 2, and the 3rd pulse signal is all identical with the first pulse signal with the 4th pulse signal; Between the 4th pulse signal and the 3rd pulse signal, have the second fixing original time delay, and the second original time delay is identical with the first original time delay; By the first radio frequency source 3, to modulator 2, send the second carrier signal, and the second carrier signal is identical with the frequency of first carrier signal; In the present embodiment, for example the second original time delay is different the causing of transmission path by the 3rd pulse signal and the 4th pulse signal;
S10: the 4th pulse signal modulation from pulse signal generator 1 is sent to square law wave detector 5 through single-pole double-throw switch (SPDT) 4 in the second carrier signal from the first radio frequency source 3 and by the signal after modulation by modulator 2;
S11: utilize 5 pairs, square law wave detector to carry out demodulation and the signal after demodulation is sent to the second analog to digital converter 9 from the signal after the modulation of modulator 2;
S12: send the second synchronized sampling clock signal by the second radio frequency source 6 to power splitter 7, by power splitter 7, the second synchronized sampling clock signal from the second radio frequency source 6 is divided into two-way and this two-way second synchronized sampling clock signal is sent to respectively to the first analog to digital converter 8 and the second analog to digital converter 9;
S13: the first analog to digital converter 8 receive after the second synchronized sampling clock signal to from the 3rd pulse signal of pulse signal generator 1, sample and sampled signal is converted to digital signal after be sent to post-processing module 10; The second analog to digital converter 9 receive the signal after the demodulation from square law wave detector 5 is sampled after the second synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module 10; In the present embodiment, the sampling of the sampling of the first analog to digital converter 8 and the second analog to digital converter 9 is carried out simultaneously;
S14: utilize post-processing module 10 by relatively obtaining the error time delay of radio system 11 to be measured;
S15: the group delay parameter that obtains radio system 11 to be measured by the error time delay that deducts the radio system to be measured 11 of above-mentioned steps S14 acquisition the relative time delay that above-mentioned steps S7 obtains.
The measurement mechanism of the radio system group delay parameter that the present embodiment provides is identical with embodiment 1.
The method of measurement of the radio system group delay parameter that the present embodiment provides comprises the steps:
S1: the moving contact of single-pole double-throw switch (SPDT) 4 is closed to the second motionless terminal 402, make to form signal path between modulator 2 and square law wave detector 5;
S2: send the 3rd pulse signal by pulse signal generator 1 to the first analog to digital converter 8, send the 4th pulse signal by pulse signal generator 1 to modulator 2, and the 3rd pulse signal is all identical with the first pulse signal with the 4th pulse signal; Between the 4th pulse signal and the 3rd pulse signal, have the second fixing original time delay, and the second original time delay is identical with the first original time delay; By the first radio frequency source 3, to modulator 2, send the second carrier signal, and the second carrier signal is identical with the frequency of first carrier signal; In the present embodiment, for example the second original time delay is different the causing of transmission path by the 3rd pulse signal and the 4th pulse signal;
S3: the 4th pulse signal modulation from pulse signal generator 1 is sent to square law wave detector 5 through single-pole double-throw switch (SPDT) 4 in the second carrier signal from the first radio frequency source 3 and by the signal after modulation by modulator 2;
S4: utilize 5 pairs, square law wave detector to carry out demodulation and the signal after demodulation is sent to the second analog to digital converter 9 from the signal after the modulation of modulator 2;
S5: send the second synchronized sampling clock signal by the second radio frequency source 6 to power splitter 7, by power splitter 7, the second synchronized sampling clock signal from the second radio frequency source 6 is divided into two-way and this two-way second synchronized sampling clock signal is sent to respectively to the first analog to digital converter 8 and the second analog to digital converter 9;
S6: the first analog to digital converter 8 receive after the second synchronized sampling clock signal to from the 3rd pulse signal of pulse signal generator 1, sample and sampled signal is converted to digital signal after be sent to post-processing module 10; The second analog to digital converter 9 receive the signal after the demodulation from square law wave detector 5 is sampled after the second synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module 10;
S7: utilize post-processing module 10 by relatively obtaining the error time delay of radio system 11 to be measured;
S8: the moving contact of single-pole double-throw switch (SPDT) 4 is closed to the first motionless terminal 401, make modulator 2 and radio system 11 to be measured form signal path;
S9: send the first pulse signal by pulse signal generator 1 to the first analog to digital converter 8, send the second pulse signal by pulse signal generator 1 to modulator 2, and the second pulse signal is identical with the first pulse signal; Between the second pulse signal and the first pulse signal, there is the first fixing original time delay; By the first radio frequency source 3, to modulator 2, send first carrier signal; In the present embodiment, for example the first original time delay is different the causing of transmission path by the first pulse signal and the second pulse signal;
S10: the second pulse signal modulation from pulse signal generator 1 is sent to square law wave detector 5 through single-pole double-throw switch (SPDT) 4 and radio system to be measured 11 successively in the first carrier signal from the first radio frequency source 3 and by the signal after modulation by modulator 2, and the time delay that the signal after radio system 11 to be measured is new with respect to first via pulse signal genration, this new time delay is different from the first original time delay and the second original time delay;
S11: the signal by 5 pairs, square law wave detector from the new time delay of having of radio system 11 to be measured carries out demodulation and the signal after demodulation is sent to the second analog to digital converter 9;
S12: send the first synchronized sampling clock signal by the second radio frequency source 6 to power splitter 7, by power splitter 7, the first synchronized sampling clock signal from the second radio frequency source 6 is divided into two-way and this two-way first synchronized sampling clock signal is sent to respectively to the first analog to digital converter 8 and the second analog to digital converter 9;
S13: the first analog to digital converter 8 receive after the first synchronized sampling clock signal to from the first pulse signal of pulse signal generator 1, sample and sampled signal is converted to digital signal after be sent to post-processing module 10; The second analog to digital converter 9 receive the signal after the demodulation from square law wave detector 5 is sampled after the first synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module 10;
S14: utilize post-processing module 10 by relatively obtaining signal after demodulation and the relative time delay between the first pulse signal;
S15: the group delay parameter that obtains radio system 11 to be measured by the error time delay that deducts the radio system to be measured 11 of above-mentioned steps S7 acquisition the relative time delay that above-mentioned steps S14 obtains.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of specification of the present invention, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (3)
1. a method of measurement for radio system group delay parameter, is characterized in that, this method of measurement comprises the steps:
The moving contact of single-pole double-throw switch (SPDT) is closed to the first motionless terminal, make modulator and radio system to be measured form signal path;
By pulse signal generator, to the first analog to digital converter, send the first pulse signal, by pulse signal generator, to modulator, send the second pulse signal, and the second pulse signal is identical with the first pulse signal; Between the second pulse signal and the first pulse signal, there is the first fixing original time delay; By the first radio frequency source, to modulator, send first carrier signal;
By modulator, the second pulse signal modulation from pulse signal generator is sent to square law wave detector through single-pole double-throw switch (SPDT) and radio system to be measured successively in the first carrier signal from the first radio frequency source and by the signal after modulation, and the time delay new with respect to first via pulse signal genration of the signal after radio system to be measured;
By square law wave detector, the signal from the new time delay of having of radio system to be measured is carried out demodulation and the signal after demodulation is sent to the second analog to digital converter;
By the second radio frequency source, to power splitter, send the first synchronized sampling clock signal, by power splitter, the first synchronized sampling clock signal from the second radio frequency source is divided into two-way and this two-way first synchronized sampling clock signal is sent to respectively to the first analog to digital converter and the second analog to digital converter;
The first analog to digital converter and the second analog to digital converter are sampled after receiving the first synchronized sampling clock signal, the first analog to digital converter receive after the first synchronized sampling clock signal to from the first pulse signal of pulse signal generator, sample and sampled signal is converted to digital signal after be sent to post-processing module; The second analog to digital converter receive the signal after the demodulation from square law wave detector is sampled after the first synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module;
Utilize post-processing module to pass through relatively to obtain signal after demodulation and the relative time delay between the first pulse signal;
The moving contact of single-pole double-throw switch (SPDT) is closed to the second motionless terminal, make to form signal path between modulator and square law wave detector;
By pulse signal generator, to the first analog to digital converter, send the 3rd pulse signal, by pulse signal generator, to modulator, send the 4th pulse signal, and the 3rd pulse signal is all identical with the first pulse signal with the 4th pulse signal; Between the 4th pulse signal and the 3rd pulse signal, have the second fixing original time delay, and the second original time delay is identical with the first original time delay; By the first radio frequency source, to modulator, send the second carrier signal;
By modulator, the 4th pulse signal modulation from pulse signal generator is sent to square law wave detector through single-pole double-throw switch (SPDT) in the second carrier signal from the first radio frequency source and by the signal after modulation;
Signal after utilizing square law wave detector to the modulation from modulator carries out demodulation and the signal after demodulation is sent to the second analog to digital converter;
By the second radio frequency source, to power splitter, send the second synchronized sampling clock signal, by power splitter, the second synchronized sampling clock signal from the second radio frequency source is divided into two-way and this two-way second synchronized sampling clock signal is sent to respectively to the first analog to digital converter and the second analog to digital converter;
The first analog to digital converter receive after the second synchronized sampling clock signal to from the 3rd pulse signal of pulse signal generator, sample and sampled signal is converted to digital signal after be sent to post-processing module; The second analog to digital converter receive the signal after the demodulation from square law wave detector is sampled after the second synchronized sampling clock signal and sampled signal is converted to digital signal after be sent to post-processing module;
Utilize post-processing module to pass through relatively to obtain the error time delay of radio system to be measured;
By the described error time delay that deducts radio system to be measured described relative time delay, obtain the group delay parameter of radio system to be measured.
2. the method for measurement of radio system group delay parameter according to claim 1, is characterized in that, the sampling of the sampling of described the first analog to digital converter and described the second analog to digital converter is carried out simultaneously.
3. the method for measurement of radio system group delay parameter according to claim 1, is characterized in that, described the second carrier signal is identical with the frequency of described first carrier signal.
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| CN105515910A (en) * | 2015-12-17 | 2016-04-20 | 北京无线电计量测试研究所 | Group delay measuring method and device |
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| CN105515910A (en) * | 2015-12-17 | 2016-04-20 | 北京无线电计量测试研究所 | Group delay measuring method and device |
| CN105515910B (en) * | 2015-12-17 | 2018-10-30 | 北京无线电计量测试研究所 | A kind of Group Delay Measurement method and apparatus |
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