CN204741461U - Two tunnel homology radiofrequency signal's range phase place ratio testing arrangement - Google Patents
Two tunnel homology radiofrequency signal's range phase place ratio testing arrangement Download PDFInfo
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- CN204741461U CN204741461U CN201520356072.XU CN201520356072U CN204741461U CN 204741461 U CN204741461 U CN 204741461U CN 201520356072 U CN201520356072 U CN 201520356072U CN 204741461 U CN204741461 U CN 204741461U
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Abstract
An embodiment of the utility model discloses a two tunnel homology radiofrequency signal's range phase place ratio testing arrangement, the device includes: homology radiofrequency signal produces the module for produce a radiofrequency signal and second feedback radiofrequency signal, homology radiofrequency signal separates receiving module for isolated a receipt radiofrequency signal and second feedback radiofrequency signal, a mixing module for be an intermediate frequency signal and second feedback intermediate frequency signal with a radiofrequency signal and the mixing of second feedback radiofrequency signal, secondary mixing module for be a low frequency signals and second feedback low frequency signals with an intermediate frequency signal mixing and the mixing of second feedback intermediate frequency signal, the module is confirmed to range phase place ratio for confirm the range phase place ratio between a radiofrequency signal and the second feedback radiofrequency signal. The utility model discloses optimize the measuring technology of two tunnel current homology radiofrequency signal's range phase place ratio, satisfied the test demand of the range phase place ratio of growing convenientization of people, accuracyization.
Description
Technical field
The utility model embodiment relates to signal detection technique, particularly relates to a kind of amplitude-phase ratio tester for measuring of two-way homology radiofrequency signal.
Background technology
Antenna feeder tester (Antenna and Cable Analyzer), also referred to as VSWR tester, is that wireless communication engineering is built, a kind of test instrumentation conventional in maintenance.It is mainly used in the indexs such as test days feeder system port standing-wave ratio, return loss and fault distance standing-wave ratio, return loss.A part very important in this product technology implementation needs the amplitude-phase ratio accurately testing out two tunnel radiofrequency signals (aerial signal and feeder signals) exactly.So-called amplitude-phase ratio, refer to Amplitude Ratio and the phase difference of two paths of signals, for example, the representation of two paths of signals is respectively: A1cos (ω+θ 1) and A2cos (ω+θ 2), then the Amplitude Ratio of two paths of signals is A1/A2; Phase difference is θ 1-θ 2.
Wherein, above-mentioned two-way radiofrequency signal generally possesses following features: two-way radiofrequency signal is from same radio-frequency signal source; Wherein a road is source radiofrequency signal, and another road is that source emission of radio frequency signals goes out the feedback signal of returning through load reflection; Radio frequency signal frequency wide ranges (being generally 1MHz ~ 6GHz); The feedback signal dynamic range reflected very large (in general, excursion can more than 40dB) and the feedback signal reflected may attach very strong interference signal etc.
In the prior art, the amplitude-phase ratio of two tunnel radiofrequency signals is tested out mainly through the following two kinds scheme.Scheme one is the amplitude-phase ratio utilizing ripe measurement chip (typical, AD8302 chip) direct-detection two-way radiofrequency signal.The major defect of the program is: the frequency range of detection signal narrow (general chip support peak frequency only have 2.7GHz); Two-way radiofrequency signal phase difference test error when particular value (typical 0 degree, near 180 degree) is large; Test result error is large, if expect precise results, need amplitude-phase ratio and the voltage curve of calibrating all frequencies, workload is very big;
Scheme two is after two-way radiofrequency signal is mixed down low frequency signal respectively through frequency mixer, two-way analog-digital chip sends it to the amplitude-phase ratio that follow-up DSP (Digital Signal Processing, Digital Signal Processing) part accurately calculates two-way low frequency signal after gathering two-way low frequency signal.The major defect of the program is: by radiofrequency signal direct conversion tremendously low frequency signal to realize difficulty large; The stability of measuring accuracy is very high to the requirement of circuit design, but this circuit is easily by PCB (Printed Circuit Board, printed circuit board) wiring, device performance, temperature, the factor impacts such as environment; When the feedback signal reflected is very little, the signal amplitude now entering analog-digital chip also can be very little, and the intrinsic sampling noiset of modulus can cause now Signal-to-Noise to be deteriorated, and error calculated becomes large; Antijamming capability is general, if strong interference signal and weak feedback signal are superimposed, system is difficult to be distinguished.
Utility model content
In view of this, the utility model embodiment provides a kind of amplitude-phase ratio tester for measuring of two-way homology radiofrequency signal, to optimize the measuring technology of the amplitude-phase ratio of existing two-way homology radiofrequency signal, meet the testing requirement of amplitude-phase ratio of the growing facilitation of people, accuracy.
The utility model embodiment provides a kind of amplitude-phase ratio tester for measuring of two-way homology radiofrequency signal, comprise: the homology radiofrequency signal generation module be connected, homology radiofrequency signal are separated receiver module, frequency mixing module, secondary mixing module and an amplitude-phase ratio determination module, wherein:
Described homology radiofrequency signal generation module, for generation of two-way homology radiofrequency signal, the first radiofrequency signal and the second feedback radiofrequency signal;
Described homology radiofrequency signal is separated receiver module, for described first radiofrequency signal of isolated reception and described second feedback radiofrequency signal;
A described frequency mixing module, for being mixed down the first intermediate-freuqncy signal and described second feedback radiofrequency signal being mixed down the second feedback intermediate-freuqncy signal by described first radiofrequency signal;
Described secondary mixing module, for being mixed down the first low frequency signal and described second feedback intermediate-freuqncy signal being mixed down the second feedback low frequency signal by described first intermediate-freuqncy signal;
Described amplitude-phase ratio determination module, for according to described first low frequency signal and described second feedback low frequency signal, determines that described first radiofrequency signal and described second feeds back the amplitude-phase ratio between radiofrequency signal.
The utility model embodiment receives the first radiofrequency signal and the second feedback radiofrequency signal respectively by using homology radiofrequency signal to be separated receiver module, after first radiofrequency signal and the second feedback radiofrequency signal are generated the first low frequency signal and the second feedback low frequency signal after twice mixing, according to the first low frequency signal and the second feedback low frequency signal, amplitude-phase ratio determination module is used to determine the technological means of the amplitude-phase ratio between the first radiofrequency signal and the second feedback radiofrequency signal, on the basis ensureing wider radio frequency signal frequency test specification, reducing radiofrequency signal direct conversion is the technical difficulty of low frequency signal, optimize the measuring technology of the amplitude-phase ratio of existing two-way homology radiofrequency signal, meet the facilitation that people are growing, the testing requirement of the amplitude-phase ratio of accuracy.
Accompanying drawing explanation
Fig. 1 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model first embodiment;
Fig. 2 is the concrete structure figure of a kind of homology radiofrequency signal generation module of the utility model first embodiment;
Fig. 3 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model second embodiment;
Fig. 4 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 3rd embodiment;
Fig. 5 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 4th embodiment;
Fig. 6 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 5th embodiment;
Fig. 7 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 6th embodiment;
Fig. 8 is the flow chart of the amplitude-phase ratio method of testing of a kind of two-way homology radiofrequency signal that the utility model adopts.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model specific embodiment is described in further detail.Be understandable that, specific embodiment described herein only for explaining the utility model, but not to restriction of the present utility model.It also should be noted that, for convenience of description, illustrate only the part relevant to the utility model in accompanying drawing but not full content.
First embodiment
Fig. 1 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model first embodiment.This device can be applied in the product of antenna feeder tester and the various amplitude-phase ratio test needing to carry out two-way homology radiofrequency signal.
As shown in Figure 1, described device comprises: the homology radiofrequency signal generation module 11 be connected, homology radiofrequency signal are separated receiver module 12, frequency mixing module 13, secondary mixing module 14 and amplitude-phase ratio determination module 15, wherein:
Described homology radiofrequency signal generation module 11, for generation of two-way homology radiofrequency signal, the first radiofrequency signal and the second feedback radiofrequency signal.
As previously mentioned (background technology part), need to carry out amplitude-phase and be generally than the two paths of signals of test the two-way homology radiofrequency signal produced by same radio-frequency signal source.Typically, the radiofrequency signal that a road signal directly produces specifically by described radio-frequency signal source, the first radiofrequency signal namely alleged by each embodiment of the utility model; Another road information is specially the radiofrequency signal of described radio-frequency signal source generation after launching, through the signal that certain load returns, and the second feedback radiofrequency signal namely alleged by each embodiment of the utility model.
Figure 2 illustrates a kind of concrete structure of homology radiofrequency signal generation module 11 and be separated the annexation figure of receiver module 12 with homology radiofrequency signal.As shown in Figure 2, described homology radiofrequency signal generation module 11 can be formed, to produce above-mentioned two-way homology radiofrequency signal by the radio-frequency signal source 111 that is connected, directional coupler 112 and at least one load 113.Wherein, described radio-frequency signal source 111, for generation of the radiofrequency signal of setpoint frequency and/or setting power; Collection result for gathering described radiofrequency signal and the feedback signal of described radiofrequency signal after at least one load 113 described, and is exported to the input that described homology radiofrequency signal is separated receiver module 12 by described directional coupler 112.Wherein, the described radiofrequency signal that described directional coupler 112 gathers is described first radiofrequency signal, and the described feedback signal of collection is described second feedback radiofrequency signal.
Wherein, directional coupler 112 is the directive coupling power elements of a kind of tool.It is a kind of four port elements, usually by being called that two sections of transmission line combination of direct-through line and coupling line form.By certain coupling mechanism, a part for direct-through line power (or whole) is coupled in coupling line between direct-through line and coupling line, and requires that power is only transmitted to a certain output port in coupling line, another port then inactivity exports.That is, described first radiofrequency signal and described second feedback radiofrequency signal can be made to export from the output port of setting by directional coupler 112.
Described homology radiofrequency signal is separated receiver module 12, for described first radiofrequency signal of isolated reception and described second feedback radiofrequency signal.
In the present embodiment, in order to the first radiofrequency signal described in final Measurement accuracy and the amplitude-phase ratio between described second feedback radiofrequency signal, first need successfully to receive above-mentioned two radiofrequency signals.Accordingly, in order to make final measurement result accurate as much as possible, need to ensure that namely above-mentioned two radiofrequency signals received are each other without crosstalk, also need described first radiofrequency signal of isolated reception and described second radiofrequency signal.
Wherein, multi-signal separation algorithm or signal isolator part can be used to be separated receiver module 12 to construct homology radiofrequency signal, preferably, radio frequency two-way switch can be used to be separated receiver module 12 as this homology radiofrequency signal.
A described frequency mixing module 13, for being mixed down the first intermediate-freuqncy signal and described second feedback radiofrequency signal being mixed down the second feedback intermediate-freuqncy signal by described first radiofrequency signal.
In the present embodiment, after two-way radiofrequency signal being low frequency signal respectively through frequency mixer direct conversion in prior art, the technical problem brought when calculating two-way radiofrequency signal amplitude-phase ratio by the mode of the amplitude-phase ratio calculating two-way low frequency signal, propose in computational process secondary mixing technology being applied to two-way radiofrequency signal amplitude-phase ratio, first the first radiofrequency signal is mixed down the first intermediate-freuqncy signal by frequency mixing module 13 and described second feedback radiofrequency signal is mixed down the second feedback intermediate-freuqncy signal.
Described secondary mixing module 14, for being mixed down the first low frequency signal and described second feedback intermediate-freuqncy signal being mixed down the second feedback low frequency signal by described first intermediate-freuqncy signal.
Described amplitude-phase ratio determination module 15, for according to described first low frequency signal and described second feedback low frequency signal, determines that described first radiofrequency signal and described second feeds back the amplitude-phase ratio between radiofrequency signal.
In the present embodiment, by described first low frequency signal and described second feedback low frequency signal are carried out difference comparison with a low frequency reference signal respectively, indirectly calculate the amplitude-phase ratio between described first low frequency signal and described second feedback low frequency signal, and then can determine that described first radiofrequency signal and described second feeds back the amplitude-phase ratio between radiofrequency signal.
The utility model embodiment receives the first radiofrequency signal and the second feedback radiofrequency signal respectively by using homology radiofrequency signal to be separated receiver module, after first radiofrequency signal and the second feedback radiofrequency signal are generated the first low frequency signal and the second feedback low frequency signal after twice mixing, according to the first low frequency signal and the second feedback low frequency signal, amplitude-phase ratio determination module is used to determine the technological means of the amplitude-phase ratio between the first radiofrequency signal and the second feedback radiofrequency signal, on the basis ensureing wider radio frequency signal frequency test specification, reducing radiofrequency signal direct conversion is the technical difficulty of low frequency signal, optimize the measuring technology of the amplitude-phase ratio of existing two-way homology radiofrequency signal, meet the facilitation that people are growing, the testing requirement of the amplitude-phase ratio of accuracy.
Second embodiment
Fig. 3 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model second embodiment.The present embodiment is optimized based on above-described embodiment, in the present embodiment, preferably described homology radiofrequency signal is separated receiver module and is specifically optimized for: radio frequency two-way switch.
As shown in Figure 3, the homology radiofrequency signal of the present embodiment is separated receiver module and is specially radio frequency two-way switch 31.
As previously mentioned, homology radiofrequency signal is separated receiver module for isolated described first radiofrequency signal of reception and described second feedback radiofrequency signal.In the present embodiment, two input channels comprised by radio frequency two-way switch 31, an output channel and a diverter switch can realize above-mentioned technique effect.Preferably, select isolation radio frequency two-way switch of good performance, the radiofrequency signal that can realize receiving in two paths is mutually without crosstalk, leakage.
Wherein, first input channel of described radio frequency two-way switch 31 is for receiving described first radiofrequency signal, second input channel of described radio frequency two-way switch 31 is for receiving described second feedback radiofrequency signal, by the diverter switch of described radio frequency two-way switch, in different time interval, described first radiofrequency signal or described second feedback radiofrequency signal are exported respectively to the output channel of described radio frequency two-way switch.
For example, in the time interval of 0 ~ 1ms, be connected with output channel by first input channel of diverter switch by described radio frequency two-way switch 31, the independent output of the first radiofrequency signal can be realized; In the time interval of 1 ~ 2ms, be connected with output channel by second input channel of diverter switch by described radio frequency two-way switch 31, the independent output of the second feedback radiofrequency signal can be realized.Wherein, when enough little (ms rank) that time interval is arranged, the real-time of follow-up signal process can be ensured.
The present embodiment comes isolated described first radiofrequency signal of reception and described second feedback radiofrequency signal by using the radio frequency two-way switch that isolation performance is good.On the guarantee simple basis of whole circuit realiration, simply, effectively can realize not interfereing with each other each other between the first received radiofrequency signal and the second feedback radiofrequency signal, and then the accuracy of final two-way radiofrequency signal amplitude-phase ratio measurement can be improved.
3rd embodiment
Fig. 4 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 3rd embodiment.The present embodiment is optimized based on the various embodiments described above, in the present embodiment, a described frequency mixing module is optimized for: radio-frequency (RF) local oscillator circuit and the first frequency mixer; Described secondary mixing module is optimized for: intermediate frequency local oscillator circuit and the second frequency mixer.
As shown in Figure 4, the output of described radio-frequency (RF) local oscillator circuit 41 is connected with the first input end of described first frequency mixer 42, the output that described homology radiofrequency signal is separated receiver module is connected with the second input of described first frequency mixer 42, and the output of described first frequency mixer 42 is connected with described secondary mixing device 44.
Wherein, the radio-frequency (RF) local oscillator signal of described first frequency mixer 42 for producing according to described radio-frequency (RF) local oscillator circuit 41, is mixed to described first intermediate-freuqncy signal and described second feedback radiofrequency signal is mixed to described second feedback intermediate-freuqncy signal by described first radiofrequency signal.
The output of described intermediate frequency local oscillator circuit 43 is connected with the first input end of described second frequency mixer 44, the output of described first frequency mixer 42 is connected with the second input of described second frequency mixer 44, and the output of described second frequency mixer 44 is connected with the input of described amplitude-phase ratio determination module.
Wherein, the intermediate frequency local oscillator signal of described second frequency mixer 44 for producing according to described intermediate frequency local oscillator circuit 43, is mixed to described first low frequency signal and described second feedback intermediate-freuqncy signal is mixed to described second feedback low frequency signal by described first intermediate-freuqncy signal.
The present embodiment is by the mode of secondary mixing, radio-frequency (RF) local oscillator circuit and intermediate frequency local oscillator circuit is used the first radiofrequency signal of high frequency and the second feedback radiofrequency signal to be finally mixed to the first low frequency signal and the second feedback low frequency signal of low frequency successively, that greatly can reduce the radio-frequency (RF) mixer used in prior art realizes difficulty, such as, without the need to direct by the radiofrequency signal Direct Conversion of 1-6000MHz to low frequency signal (such as 100kHz), under the prerequisite reducing circuit design requirements, ensure that certain accuracy of measurement.
4th embodiment
Fig. 5 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 4th embodiment.The present embodiment is optimized based on the various embodiments described above, in the present embodiment, also preferably include: the intermediate-freuqncy signal be connected between the first frequency mixing module and secondary mixing module optimizes module, wherein, described intermediate-freuqncy signal optimizes module, for being optimized process to described first intermediate-freuqncy signal and described second feedback intermediate-freuqncy signal.
Meanwhile, intermediate-freuqncy signal is optimized module to be specifically optimized for: the intermediate frequency filtering circuit be connected and intermediate-frequency gain Circuit tuning.
As shown in Figure 5, the input of described intermediate frequency filtering circuit 51 is connected with the output of described first mixting circuit, and the output of described intermediate-frequency gain Circuit tuning 52 is connected with the input of described second mixting circuit.
Wherein, described intermediate frequency filtering circuit 51, feeds back the out-of-band noise of intermediate-freuqncy signal for the first intermediate-freuqncy signal described in filtering and described second.
Typically, intermediate frequency filtering circuit 51 can be selected with high q-factor narrow band filter ripe on market (such as, Surface Acoustic Wave Filter etc.), and the present embodiment does not limit this.
Described intermediate-frequency gain Circuit tuning 52, for adjusting the signal amplitude of described first intermediate-freuqncy signal and described second feedback intermediate-freuqncy signal.
One of the present embodiment preferred embodiment in, intermediate-frequency gain Circuit tuning 52 is mainly used in the signal amplitude improving described first intermediate-freuqncy signal and described second feedback intermediate-freuqncy signal.
The present embodiment optimizes module by adding intermediate-freuqncy signal after the first mixting circuit, reaches the object described first intermediate-freuqncy signal and described second feedback intermediate-freuqncy signal being optimized to process.Wherein, intermediate frequency filtering circuit then can improve the antijamming capability of whole system by the mode of filtering out-of-band noise, and intermediate-frequency gain Circuit tuning by improving the mode of the signal amplitude of useful signal, can improve the signal to noise ratio of whole radio frequency link.
On the basis of the various embodiments described above, can also comprise: the low frequency signal be connected between described second frequency mixing module and described amplitude-phase ratio determination module optimizes module;
Described low frequency signal optimizes module, for being optimized process to described first low frequency signal and described second feedback low frequency signal.
Accordingly, described low frequency signal is optimized module and specifically can be comprised: the low-frequency filter circuit be connected and low-frequency gain Circuit tuning, the input of described low-frequency filter circuit is connected with the output of described second mixting circuit, and the output of described low-frequency gain Circuit tuning is connected with the input of described amplitude-phase ratio determination module;
Described low-frequency filter circuit, feeds back the out-of-band noise of low frequency signal for the first low frequency signal described in filtering and described second; Described low-frequency gain Circuit tuning, for adjusting the signal amplitude of described first low frequency signal and described second feedback low frequency signal.
The benefit of such setting is: the signal to noise ratio that can improve whole radio frequency link further, and the antijamming capability of whole system.
5th embodiment
Fig. 6 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 5th embodiment.The present embodiment is optimized based on the various embodiments described above, in the present embodiment, is specifically optimized for by described amplitude-phase ratio determination module: low frequency reference signal produces circuit, two-way modulus Acquisition Circuit and analysis module.
As shown in Figure 6, the output that described low frequency reference signal produces circuit 61 is connected with the first analog input end of described two-way modulus Acquisition Circuit 62, and the output of described secondary mixing module is connected with the second analog input end of described two-way modulus Acquisition Circuit 62;
Described low frequency reference signal produces circuit 61, for generation of stable low frequency reference signal.
Described two-way modulus Acquisition Circuit 62, for calculating the first amplitude-phase ratio between described first low frequency signal and described low frequency reference signal respectively, and the second amplitude-phase ratio between described second feedback low frequency signal and described low frequency reference signal.
Described analysis module 63, for determining the amplitude-phase ratio between described first radiofrequency signal and described second feedback radiofrequency signal according to described first amplitude-phase ratio and described second amplitude-phase ratio.
In the present embodiment, not that directly calculating the first low frequency signal and second feeds back the amplitude-phase ratio between low frequency signal, but by using homology radiofrequency signal to be separated receiver module, calculate the first low frequency signal, amplitude-phase ratio between the second feedback low frequency signal and a stable low frequency reference signal respectively in the mode switched, and then determine the amplitude-phase ratio between described first radiofrequency signal and described second feedback radiofrequency signal.Wherein, the time of twice calculating and signals collecting is very short (being generally the interval of a few ms), then can think that two-way radiofrequency signal is also stable.
For example, if the first low frequency signal obtained is A1cos (ω+θ 1), the second feedback low frequency signal is A2cos (ω+θ 2), and low frequency reference signal is A0cos (ω+θ 0); Then: the amplitude-phase ratio between the first low frequency signal and this low frequency reference signal is: D1=A1/A0; Phase difference is φ 1=θ 1-θ 0; Amplitude-phase ratio between second low frequency signal and this low frequency reference signal is: D2=A2/A0; Phase difference is φ 2=θ 2-θ 0, and accordingly, analysis module 63, by calculating D1/D2 and φ 1-φ 2, can obtain the amplitude-phase ratio between described first radiofrequency signal and described second feedback radiofrequency signal.
The present embodiment feeds back amplitude-phase ratio between low frequency signal and a stable low frequency reference signal by calculating the first low frequency signal and second respectively, determine the technological means of the amplitude-phase ratio between the first radiofrequency signal and the second feedback radiofrequency signal, can under the prerequisite ensureing frequency measurement scope, further reduction measure error, improves certainty of measurement.
6th embodiment
Fig. 7 is the structure chart of the amplitude-phase ratio tester for measuring of a kind of two-way homology radiofrequency signal of the utility model the 6th embodiment.The present embodiment is optimized based on the various embodiments described above, in the present embodiment, the clock source that described radio-frequency signal source, described radio-frequency (RF) local oscillator circuit, described intermediate frequency local oscillator circuit, described low frequency reference signal generation circuit or described two-way modulus Acquisition Circuit use is that same crystal oscillator clock is produced by the mode of frequency division or frequency multiplication.
As shown in Figure 7, low frequency reference signal produces circuit, radio-frequency signal source, radio-frequency (RF) local oscillator circuit, intermediate frequency local oscillator circuit, the modulus sampling clock that two-way modulus Acquisition Circuit uses, all take from same clock circuit, the crystal oscillator clock 71 that this clock is generally a high stability completes.Wherein, the modulus sampling clock that low frequency reference signal generation circuit and two-way modulus Acquisition Circuit use can be produced by frequency dividing circuit 72, and in addition, radio-frequency signal source and radio-frequency (RF) local oscillator circuit can be obtained by phase-locked loop circuit frequency multiplication.
The benefit of such setting is: ensure that the Phase synchronization of measurement result also can remove the impact of phase place randomized jitter, further increase the accuracy of measurement result.
Utility model people finds by the amplitude-phase ratio test products that said apparatus is applied to two-way homology radiofrequency signal: said apparatus can improve measuring accuracy and stability greatly.
Wherein, the important technological parameters applying the product of said apparatus comprises:
Operating frequency: 1-6000MHz;
Two-way radiofrequency signal ratio dynamic range: be greater than 40dB;
Port maximum power: be less than 0dbm;
Antijamming capability is strong: channel antijamming capability+20dBm (<+/-1MHz).
Repeat 10 times and calculate test result, find measuring accuracy and stability very well, in amplitude fluctuation +/-0.03dB, phase place maximum fluctuation about 1 degree.Wherein, concrete test result is as shown in table 1.
Table 1
Fig. 8 is the flow chart of the amplitude-phase ratio method of testing of a kind of two-way homology radiofrequency signal that the utility model adopts.This method of testing can adopt the amplitude-phase ratio tester for measuring of the two-way homology radiofrequency signal of the utility model any embodiment to realize.
This method of testing specifically comprises:
810, two-way homology radiofrequency signal is produced by homology radiofrequency signal generation module, the first radiofrequency signal and the second feedback radiofrequency signal.
820, isolated described first radiofrequency signal of reception of receiver module and described second feedback radiofrequency signal is separated by homology radiofrequency signal.
830, described first radiofrequency signal is mixed down the first intermediate-freuqncy signal by frequency mixing module and described second feedback radiofrequency signal is mixed down the second feedback intermediate-freuqncy signal.
840, described first intermediate-freuqncy signal is mixed down the first low frequency signal by secondary mixing module and described second feedback intermediate-freuqncy signal is mixed down the second feedback low frequency signal.
850, by amplitude-phase ratio determination module, according to described first low frequency signal and described second feedback low frequency signal, determine that described first radiofrequency signal and described second feeds back the amplitude-phase ratio between radiofrequency signal.
The utility model embodiment receives the first radiofrequency signal and the second feedback radiofrequency signal respectively by using homology radiofrequency signal to be separated receiver module, after first radiofrequency signal and the second feedback radiofrequency signal are generated the first low frequency signal and the second feedback low frequency signal after twice mixing, according to the first low frequency signal and the second feedback low frequency signal, amplitude-phase ratio determination module is used to determine the technological means of the amplitude-phase ratio between the first radiofrequency signal and the second feedback radiofrequency signal, on the basis ensureing wider radio frequency signal frequency test specification, reducing radiofrequency signal direct conversion is the technical difficulty of low frequency signal, optimize the measuring technology of the amplitude-phase ratio of existing two-way homology radiofrequency signal, meet the facilitation that people are growing, the testing requirement of the amplitude-phase ratio of accuracy.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, to those skilled in the art, the utility model can have various change and change.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. the amplitude-phase ratio tester for measuring of a two-way homology radiofrequency signal, it is characterized in that, comprise: the homology radiofrequency signal generation module be connected, homology radiofrequency signal are separated receiver module, frequency mixing module, secondary mixing module and an amplitude-phase ratio determination module, wherein:
Described homology radiofrequency signal generation module, for generation of two-way homology radiofrequency signal, the first radiofrequency signal and the second feedback radiofrequency signal;
Described homology radiofrequency signal is separated receiver module, for described first radiofrequency signal of isolated reception and described second feedback radiofrequency signal;
A described frequency mixing module, for being mixed down the first intermediate-freuqncy signal and described second feedback radiofrequency signal being mixed down the second feedback intermediate-freuqncy signal by described first radiofrequency signal;
Described secondary mixing module, for being mixed down the first low frequency signal and described second feedback intermediate-freuqncy signal being mixed down the second feedback low frequency signal by described first intermediate-freuqncy signal;
Described amplitude-phase ratio determination module, for according to described first low frequency signal and described second feedback low frequency signal, determines that described first radiofrequency signal and described second feeds back the amplitude-phase ratio between radiofrequency signal.
2. device according to claim 1, it is characterized in that, described homology radiofrequency signal generation module comprises: the radio-frequency signal source be connected, directional coupler and at least one load, and the input that output and the described homology radiofrequency signal of described directional coupler are separated receiver module is connected;
Described radio-frequency signal source, for generation of the radiofrequency signal of setpoint frequency and/or setting power;
Collection result for gathering described radiofrequency signal and the feedback signal of described radiofrequency signal after at least one load described, and is exported to the input that described homology radiofrequency signal is separated receiver module by described directional coupler;
Wherein, the described radiofrequency signal of described directional coupler collection is described first radiofrequency signal, and the described feedback signal of collection is described second feedback radiofrequency signal.
3. device according to claim 1, is characterized in that, described homology radiofrequency signal is separated receiver module and comprises: radio frequency two-way switch, and described radio frequency two-way switch includes two input channels, an output channel and a diverter switch;
Wherein, first input channel of described radio frequency two-way switch is for receiving described first radiofrequency signal, second input channel of described radio frequency two-way switch is for receiving described second feedback radiofrequency signal, by the diverter switch of described radio frequency two-way switch, in different time interval, described first radiofrequency signal or described second feedback radiofrequency signal are exported respectively to the output channel of described radio frequency two-way switch.
4. device according to claim 1, it is characterized in that, a described frequency mixing module comprises: radio-frequency (RF) local oscillator circuit and the first frequency mixer, the output of described radio-frequency (RF) local oscillator circuit is connected with the first input end of described first frequency mixer, the output that described homology radiofrequency signal is separated receiver module is connected with the second input of described first frequency mixer, and the output of described first frequency mixer is connected with the input of described secondary mixing module;
Wherein, described first frequency mixer is used for the radio-frequency (RF) local oscillator signal produced according to described radio-frequency (RF) local oscillator circuit, described first radiofrequency signal is mixed to described first intermediate-freuqncy signal and described second feedback radiofrequency signal is mixed to described second feedback intermediate-freuqncy signal.
5. device according to claim 1, it is characterized in that, described secondary mixing module comprises: intermediate frequency local oscillator circuit and the second frequency mixer, the output of described intermediate frequency local oscillator circuit is connected with the first input end of described second frequency mixer, the output of described first frequency mixing module is connected with the second input of described second frequency mixer, and the output of described second frequency mixer is connected with the input of described amplitude-phase ratio determination module;
Wherein, described second frequency mixer is used for the intermediate frequency local oscillator signal produced according to described intermediate frequency local oscillator circuit, described first intermediate-freuqncy signal is mixed to described first low frequency signal and described second feedback intermediate-freuqncy signal is mixed to described second feedback low frequency signal.
6. device according to claim 1, is characterized in that, also comprises: the intermediate-freuqncy signal be connected between described first frequency mixing module and described secondary mixing module optimizes module;
Described intermediate-freuqncy signal optimizes module, for being optimized process to described first intermediate-freuqncy signal and described second feedback intermediate-freuqncy signal.
7. device according to claim 6, it is characterized in that, described intermediate-freuqncy signal is optimized module and is specifically comprised: the intermediate frequency filtering circuit be connected and intermediate-frequency gain Circuit tuning, the input of described intermediate frequency filtering circuit is connected with the output of described first mixting circuit, and the output of described intermediate-frequency gain Circuit tuning is connected with the input of described second mixting circuit;
Described intermediate frequency filtering circuit, feeds back the out-of-band noise of intermediate-freuqncy signal for the first intermediate-freuqncy signal described in filtering and described second;
Described intermediate-frequency gain Circuit tuning, for adjusting the signal amplitude of described first intermediate-freuqncy signal and described second feedback intermediate-freuqncy signal.
8. device according to claim 1, it is characterized in that, described amplitude-phase ratio determination module comprises: low frequency reference signal produces circuit, two-way modulus Acquisition Circuit and analysis module, the output that described low frequency reference signal produces circuit is connected with the first analog input end of described two-way modulus Acquisition Circuit, and the output of described secondary mixing module is connected with the second analog input end of described two-way modulus Acquisition Circuit;
Described low frequency reference signal produces circuit, for generation of stable low frequency reference signal;
Described two-way modulus Acquisition Circuit, for calculating the first amplitude-phase ratio between described first low frequency signal and described low frequency reference signal respectively, and the second amplitude-phase ratio between described second feedback low frequency signal and described low frequency reference signal;
Described analysis module, for determining the amplitude-phase ratio between described first radiofrequency signal and described second feedback radiofrequency signal according to described first amplitude-phase ratio and described second amplitude-phase ratio.
9. the device according to any one of claim 1-8, it is characterized in that, the clock source that described radio-frequency signal source, described radio-frequency (RF) local oscillator circuit, described intermediate frequency local oscillator circuit, described low frequency reference signal generation circuit or described two-way modulus Acquisition Circuit use is that same crystal oscillator clock is produced by the mode of frequency division or frequency multiplication.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901753A (en) * | 2015-05-28 | 2015-09-09 | 北京信维科技股份有限公司 | Amplitude ratio and phase difference testing method and device for two homologous radio frequency signals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901753A (en) * | 2015-05-28 | 2015-09-09 | 北京信维科技股份有限公司 | Amplitude ratio and phase difference testing method and device for two homologous radio frequency signals |
| CN104901753B (en) * | 2015-05-28 | 2017-06-23 | 北京信维科技股份有限公司 | The amplitude-phase ratio method of testing and device of the homologous radiofrequency signal of two-way |
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