CN102546040B - Method and system for testing channel delay difference - Google Patents
Method and system for testing channel delay difference Download PDFInfo
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- CN102546040B CN102546040B CN201010601011.7A CN201010601011A CN102546040B CN 102546040 B CN102546040 B CN 102546040B CN 201010601011 A CN201010601011 A CN 201010601011A CN 102546040 B CN102546040 B CN 102546040B
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Abstract
The invention relates to a method and system for testing a channel delay difference and mainly achieves the aim of measuring the channel delay difference of a terminal with variable bandwidth. The method comprises the following steps of: a), sending a frequency-modulated signal with a carrier frequency of fc and a modulation frequency of fe to the terminal to be tested; b), notifying the terminal to be tested a center frequency point fc of a receiving signal and a bandwidth Bi to be measured in a variable bandwidth range; c), carrying out receiving at the terminal to be tested and measuring a phase phi(i) of the receiving signal; and d), calculating a phase difference according to a reference phase phi(0) under a selected bandwidth in the variable bandwidth range and the phase phi(i) and calculating the channel delay difference according to the phase difference, wherein the frame length of a communication system which the terminal to be tested is based on is positive integer times of the period of the frequency-modulated signal and the period of the frequency-modulated signal is greater than the maximum channel delay inside the terminal to be tested.
Description
Technical field
The present invention relates to a kind of method of test channel delay inequality, be applied to the system of LTE system and the follow-up various bandwidth varyings that may occur.
Background technology
Due to the factor such as signal processor, communication media, in communication system, conventionally exist channel time delay.Channel time delay to be discussed below, refers to the device time delay of receiving terminal inside, as shown in Figure 1.Specifically, antenna 10 receives after signal, processes through radio frequency chip 12, is converted to the time delay producing in this process of digital signal.Here the time delay maximum being produced by low pass filter.And, for the signal of different bandwidth, due to the difference that arranges of low pass filter, cause having larger difference through the time delay of this low pass filter.
Channel time delay has close relationship with system bandwidth, and communication system before, if the communication systems such as GSM, TD-SCDMA, WCDMA are all the systems of equiband, so channel time delay is as long as measure at the beginning, just can not change again.And Long Term Evolution (LTE) system comprises time division duplex (TDD) system and Frequency Division Duplexing (FDD) (FDD) system, be the communication system of adaptive-bandwidth, its bandwidth from 1.4MHz to 20MHz not etc.Channel time delay corresponding under each bandwidth also exists larger difference, if still use unified channel time delay to deal with various bandwidth, can be because receive the deviation of timing, thus affect the quality of reception, even can cause receiving decoding error.
In addition, existing channel time delay method of testing is by being undertaken by the method for oscilloscope tolerance.The shortcoming that this method exists is, needs people's participation, cannot realize automatic test, and certainty of measurement is not high, and error is large.
Summary of the invention
An object of the present invention is to provide a kind of method and system of test channel delay inequality, the one or more problems that exist to solve prior art.
Based on above-mentioned purpose, one aspect of the present invention proposes a kind of method of test channel time delay, and the method comprises the following steps:
A) sending carrier frequency to this terminal to be measured is f
c, and modulating frequency is f
efM signal;
B) notify to this terminal to be measured the center frequency point f that receives signal
cwith the bandwidth B to be measured within the scope of a bandwidth varying
i;
C) receive in this terminal to be measured, measure the phase place phase place that receives signal
D) according to the fixed phase under the selected bandwidth of one within the scope of this bandwidth varying
with this phase place
calculate phase difference, and poor according to this phase difference calculating channel time delay;
Wherein this terminal to be measured based on the frame length of communication system be this FM signal cycle positive integer doubly, and this FM signal cycle be greater than the largest passages time delay of this terminal inner to be measured.
In one embodiment of this invention, c) or d) also can comprise afterwards in step:
E) determine whether to have traveled through the bandwidth to be measured within the scope of this bandwidth varying;
If f) do not traveled through bandwidth to be measured, changed bandwidth B to be measured
i, and return to this step and b) continue to test.
In one embodiment of this invention, a) also comprise before in step: receive center frequency point f
c, bandwidth one or more to be measured within the scope of this bandwidth varying and this terminal to be measured based on the setting of communication system types.At this, according to this terminal to be measured based on communication system types arrange calculate this frequency modulating signal.
In one embodiment of this invention, said method is can send between the instrument of FM signal and this terminal to be measured and automatically perform at a main frame,, wherein: step a) in, utilize this instrument of this host notification to send this FM signal; Step b) in, utilize this main frame to notify this center frequency point f to this terminal to be measured
cwith this bandwidth B to be measured
i.
In one embodiment of this invention, this steps d) can carry out in this terminal to be measured, and this terminal storage channel time delay to be measured is poor.
In one embodiment of this invention, this steps d) be to carry out in host side, and in steps d) also comprise afterwards: from this main frame by poor the channel time delay bandwidth to be measured this terminal to be measured of notifying; And poor at this terminal storage channel time delay to be measured.
In one embodiment of this invention, this terminal to be measured based on communication system comprise LTE system.
The another system that proposes a kind of test channel delay inequality of the present invention, in order to test the inner passage delay inequality of a terminal to be measured, this system comprises instrument and main frame.Instrument is in order to send a FM signal.Main frame connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
efM signal, and notify this terminal to be measured based on center frequency point f
cwith the bandwidth B to be measured within the scope of a bandwidth varying
ireceive signal, then according to the fixed phase under the selected bandwidth of one within the scope of this bandwidth varying
the phase place of the reception signal returning with this terminal to be measured
calculate phase difference, and poor according to this phase difference calculating channel time delay.Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle be greater than the largest passages time delay of this terminal inner to be measured.
In one embodiment of this invention, this main frame also provides an operation interface, for receiving center frequency point f
c, bandwidth one or more to be measured within the scope of this bandwidth varying and this terminal to be measured based on the setting of communication system types.
In one embodiment of this invention, this main frame is also for determining whether to have traveled through the bandwidth to be measured within the scope of a bandwidth varying, if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
In one embodiment of this invention, this main frame is also for by poor the channel time delay under each bandwidth to be measured this terminal to be measured of notifying.
The present invention also proposes the system of another kind of test channel delay inequality, and in order to test the inner passage delay inequality of a terminal to be measured, this system comprises instrument and main frame.This instrument is in order to send a FM signal.Main frame connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
efM signal, and notify this terminal to be measured based on center frequency point f
cwith the bandwidth B to be measured within the scope of a bandwidth varying
ireceive signal.Wherein, receive in this terminal to be measured, measure the phase place that receives signal
and this terminal to be measured is according to the fixed phase under the selected bandwidth of one within the scope of this bandwidth varying
with this phase place
calculate phase difference, then poor according to this phase difference calculating channel time delay.Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle be greater than the largest passages time delay of this terminal inner to be measured.
In one embodiment of this invention, this main frame also provides an operation interface, for receiving center frequency point f
c, bandwidth one or more to be measured within the scope of this bandwidth varying and this terminal to be measured based on the setting of communication system types.
In one embodiment of this invention, this main frame is also for determining whether to have traveled through the bandwidth to be measured within the scope of a bandwidth varying, if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
In one embodiment of this invention, this terminal to be measured based on communication system comprise LTE system.
The present invention is owing to adopting the method and system of above-mentioned test channel delay inequality, FM signal by characteristic frequency is set is as measured signal, and obtain delay inequality according to phase difference, can automated execution measure, and it is poor to measure easily the channel time delay of different bandwidth.
Brief description of the drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the channel time delay schematic diagram of receiving terminal inside.
Fig. 2 illustrates the test macro that the channel time delay of one embodiment of the invention is poor.
Fig. 3 illustrates the channel time delay schematic diagram under different bandwidth.
Fig. 4 illustrates the method for testing flow chart of first embodiment of the invention.
Fig. 5 illustrates the method for testing flow chart of second embodiment of the invention.
Fig. 6 illustrates variation example embodiment illustrated in fig. 5.
Embodiment
Fig. 2 illustrates the test macro of channel time delay.In Fig. 2, terminal 100 is for waiting for the object of test channel time delay, and in an embodiment of the present invention, terminal 100 can be mobile phone or has the portable mobile terminal of similar communication function.Terminal 100 can be based on LTE system, and when based on LTE system, terminal has variable bandwidth.
The inner time delay of terminal 100 can be with reference to the channel time delay schematic diagram shown in Fig. 1.At this, instrumentation 200 and main frame 300 carry out channel time delay test to terminal 100.
Instrument 200 has center frequency point at f for producing and launch
c, and by a frequency f
ethe instrument of the frequency modulation test signal of modulation.In one embodiment of this invention, frequency modulation test signal can be tone signal, and carrier and modulating signal is all sinusoidal wave signal.In other embodiments of the invention, frequency modulation test signal can be to produce based on square wave, triangular wave (comprising the signal periodically and have in the cycle with certain Changing Pattern that instrument can produce).
Between instrument 200 and terminal 100, at intervals, terminal 100 receives test signal from instrument 200.
Main frame 300 is in order to test parameter to be set, and controls test process.After test finishes, main frame 300 can output test result to outside, and/or directly presents test result.
In practical application example, main frame 300 can be configured to personal computer, for example desktop computer or notebook, operation test program on it.Test program provides operation interface to tester, and reception bandwidth for you to choose starts test, and presents test result.
In one embodiment, between main frame 300 and terminal 100, and can connect by wired mode between main frame 300 and instrument 200.
When test, instrument 200 can adopt tone signal described above, is fixed on center frequency point f
csend modulating frequency f
efor sine wave, be modulated to the frequency f after base band
edetermine according to the channel time delay of the frame length of system and maximum possible.F
edefinite method as follows:
1. the first basic timing using the frame length of system as system, requirement can comprise an integer tone signal, the positive integer that frame length of system is necessary for sine wave period T doubly, T=1/f
e;
2. the channel time delay τ of maximum possible must be less than sinusoidal wave cycle T;
3.λ/T＝c。
Wherein, c is the light velocity.
For example, for LTE system, frame length is 1ms, f
ebe necessary for the positive integer of 100KHz doubly, so just can satisfy condition 1.
In addition, largest passages time delay is general relevant with bandwidth, and bandwidth is less, and channel time delay is larger.For LTE system, largest passages time delay produces under lower band 1.4MHz, and its value is roughly the magnitude of 2～3us, so, in order to satisfy condition 2, so must make f
evalue be less than 500KHz.
Terminal 100 is by arranging one based on center frequency point f
creception bandwidth, receive respectively the data of a system frame length in the place of separation frame length.Due to the system frame length integral multiple that is sinusoidal wavelength, so just can ensure under the condition without inner passage time delay, the initial phase that the time point that terminal 100 starts to receive sends waveform zero point with respect to transmitting terminal is duplicate, and remaining phase deviation is because of devices such as the radio-frequency filter of signal by terminal 100 inside extra introducing.Add up like this, respectively every section of phase place receiving in data
then according to the following equation 1, its difference is converted to the time, be exactly the channel time delay under this reception bandwidth.
(formula 1)
At this, for the LTE system with variable bandwidth, terminal 100 receives test channel time delay under bandwidth at 1.4MHz to the difference between 20MHz.Fig. 3 illustrates several different channel time delay schematic diagrames that receive under bandwidth.Shown in Fig. 3, under 20MHz bandwidth, channel time delay is τ 1; Under 10MHz bandwidth, channel time delay is τ 2; Under 5MHz bandwidth, channel time delay is τ 3, by that analogy.
Test program is by recording the phase place under different bandwidth, by calculating the channel time delay that just can obtain different bandwidth.
It is worth mentioning that, the introducing of considering channel time delay very major part is because the work of low pass filter causes, so if bandwidth is larger, so corresponding low pass filter parameter configuration will simpler, corresponding channel time delay is also just shorter.Based on this prerequisite, can receive the phase place recording with system maximum bandwidth
for benchmark, in conjunction with the phase place recording under other bandwidth
can obtain corresponding phase difference
(formula 2)
Due to the term restriction of instrument signal, sinusoidal wave wavelength is less than the channel time delay of maximum possible, so phase difference again
must be between 0～2 π, the computing formula of the poor Δ τ of channel time delay is as follows:
(formula 3)
Certainly, this is preferably example of one, in fact, can within the scope of bandwidth varying, select arbitrary bandwidth, using the phase place under this bandwidth as with reference to phase place
obtain the poor Δ τ of channel time delay under all the other each bandwidth to be measured.
According to above process, summarize the method for testing basic procedure of one embodiment of the invention.This embodiment will utilize the test macro shown in Fig. 2 to describe, but be appreciated that the embodiment of the present invention method of testing execution and do not rely on specific test macro.As an example, an integrated special test system that sends FM signal function and test process control function can be used to replace the above-mentioned particular system that comprises instrument and main frame to carry out method of testing.
Fig. 4 illustrates the method for testing flow process of first embodiment of the invention.This embodiment has the terminal of bandwidth varying in order to test.Before test, the operation interface of main frame 300 is carried out to parameter setting, the type (LTE etc.) of such as system, center frequency point f
c, bandwidth varying scope B etc.According to the type of system, main frame 300 can be determined the frequency f of FM signal
e.Shown in Fig. 4, the step of the present embodiment is as follows:
Step S11, it is f that main frame 300 notifies instrument 200 to send carrier frequency
c, modulating frequency is f
efM signal.
Step S12, main frame 300 to terminal 100 to be measured inform receive signal based on center frequency point f
cwith bandwidth B to be measured
i;
In this bandwidth B
ifor the bandwidth in bandwidth varying scope B.For example, in the time that bandwidth varying scope B is 1.4MHz to 20MHz, bandwidth B
ican be the arbitrary value within the scope of this.
Step S13, terminal 100 to be measured is carried out event reception, measures the phase place that receives signal
Step S14, main frame 300 judges whether that all bandwidth to be measured have all traveled through, and if so, enters into step S16, otherwise jumps to step S15.
Step S15, main frame 300 is revised bandwidth B
i, repeating step S12, until all bandwidth to be measured have all traveled through;
At this, obtain the bandwidth B all to be measured in bandwidth varying scope B inherence
iphase place, comprise the fixed phase under maximum bandwidth
after traversal completes, the end-of-job of main frame 300, no longer sends notice to terminal 100 to be measured.
As mentioned before, as an alternative, also can select phase place under other bandwidth beyond maximum bandwidth as with reference to phase place.
Step S16, terminal 100 to be measured is first utilized each bandwidth B to be measured
iunder phase place
and fixed phase
calculate each phase difference according to formula 2
and obtain the poor Δ τ of each channel time delay according to formula 3.
Step S17, terminal 100 to be measured writes result of calculation the memory cell of terminal inner.
In the present embodiment, although described in a sequential manner method of testing flow process, the method for being appreciated that can have other execution sequences.In the step 16 that the step S14 carrying out at main frame 300 can carry out in terminal 300 to be measured or step 17, carry out, or more late execution.
Fig. 5 illustrates the method for testing flow process of second embodiment of the invention.This embodiment has the terminal of bandwidth varying in order to test.Different from last embodiment, calculate the poor step of channel time delay and be placed on execution in main frame.Before test, the operation interface of main frame 300 is carried out to parameter setting, the type (LTE etc.) of such as system, center frequency point f
c, bandwidth varying scope B etc.According to the type of system, main frame 300 can be determined the frequency f of FM signal
e.Shown in Fig. 5, the step of the present embodiment is as follows:
Step S21, it is f that main frame 300 notifies instrument 200 to send carrier frequency
c, modulating frequency is f
efM signal;
Step S22, main frame 300 is informed the center frequency point f that receives signal to terminal 100 to be measured
cwith bandwidth B to be measured
i;
In this bandwidth B
ifor the bandwidth in bandwidth varying scope B.For example, in the time that bandwidth varying scope B is 1.4MHz to 20MHz, bandwidth B
ican be the arbitrary value within the scope of this;
Step S23, terminal 100 to be measured is carried out event reception, measures the phase place that receives signal
and return to phase place to main frame 300
At this, initial phase can be the waveform starting point of modulation signal, there is no channel time delay at this point;
Step S24, main frame 300 judges whether that all bandwidth to be measured have all traveled through, and if so, enters into step S26, otherwise jumps to step S25.
Step S25, main frame 300 is revised bandwidth B to be measured
i, repeating step S12, until all bandwidth to be measured have all traveled through;
At this, obtain the bandwidth B all to be measured in bandwidth varying scope B inherence
iphase place, comprise the fixed phase under maximum bandwidth
Step S26, main frame 300 first utilizes phase place
and fixed phase
calculate phase difference according to formula 2
and obtain the poor Δ τ of channel time delay according to formula 3;
As mentioned before, as an alternative, also can select phase place under other bandwidth beyond maximum bandwidth as with reference to phase place
Step S27, main frame 300 is notified terminal 100 to be measured by poor the channel time delay under each bandwidth to be measured of bandwidth varying scope B;
Step S28, terminal 100 to be measured writes this result the memory cell of terminal inner.
In the present embodiment, although described in a sequential manner method of testing flow process, the method for being appreciated that can have other execution sequences.In the variation example shown in Fig. 6, if obtained fixed phase
at main frame 300, after step S23, execution step S24 ', first calculates the poor Δ τ of channel time delay under current bandwidth.
The method of a kind of test channel delay inequality that the above embodiment of the present invention proposes, compared with existing method of testing, has the following advantages:
1, adopt simple transmitting-receiving principle, reach accuracy and the reliability of test result;
2, different bandwidth is tested respectively, and each test exists certain independence each other;
3, for the test result of different bandwidth, merge test result and be automatically converted to delay inequality;
4, realize simply, can in batch production, automatically test.
Although the present invention discloses as above with preferred embodiment; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is worked as with being as the criterion that claims were defined.
Claims (22)
1. a method for test channel delay inequality, in order to test the inner passage delay inequality of a terminal to be measured, the method comprises the following steps:
A) sending carrier frequency to this terminal to be measured is f
c, and modulating frequency is f
efM signal;
B) notify to this terminal to be measured the center frequency point f that receives signal
cwith the bandwidth B to be measured within the scope of a bandwidth varying
i;
C) receive in this terminal to be measured, measure the phase place that receives signal
D) according to the fixed phase under the selected bandwidth of one within the scope of this bandwidth varying
with this phase place
calculate phase difference, and poor with respect to the channel time delay of this selected bandwidth according to this bandwidth to be measured of this phase difference calculating;
Wherein this terminal to be measured based on the frame length of communication system be this FM signal cycle positive integer doubly, and this FM signal cycle be greater than the largest passages time delay of this terminal inner to be measured.
2. the method for claim 1, is characterized in that, c) also comprises afterwards in step:
E) determine whether to have traveled through the bandwidth to be measured within the scope of this bandwidth varying;
If f) do not traveled through bandwidth to be measured, changed bandwidth B to be measured
i, and return to this step and b) continue to test.
3. the method for claim 1, is characterized in that, in steps d) also comprise afterwards:
E) determine whether to have traveled through the bandwidth to be measured within the scope of this bandwidth varying;
If f) do not traveled through bandwidth to be measured, changed bandwidth B to be measured
i, and return to this step and b) continue to test.
4. the method for claim 1, is characterized in that, a) also comprises before in step: receive center frequency point f
c, bandwidth one or more to be measured within the scope of this bandwidth varying and this terminal to be measured based on the setting of communication system types.
5. method as claimed in claim 3, is characterized in that, according to this terminal to be measured based on communication system types arrange calculate this frequency modulating signal.
6. the method for claim 1, is characterized in that, is can send between the instrument of FM signal and this terminal to be measured and automatically perform at a main frame,, wherein:
Step a) in, utilize this instrument of this host notification to send this FM signal;
Step b) in, utilize this main frame to notify this center frequency point f to this terminal to be measured
cwith this bandwidth B to be measured
i.
7. method as claimed in claim 6, is characterized in that, c) also comprises afterwards in step:
E) this main frame determines whether to have traveled through the bandwidth to be measured within the scope of this bandwidth varying;
If f) do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and return to this step and b) continue to test.
8. method as claimed in claim 6, is characterized in that, in steps d) also comprise afterwards:
E) this main frame determines whether to have traveled through the bandwidth to be measured within the scope of this bandwidth varying;
If f) do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and return to this step and b) continue to test.
9. method as claimed in claim 7 or 8, is characterized in that this steps d) be to carry out in this terminal to be measured, and this terminal storage channel time delay to be measured is poor.
10. method as claimed in claim 7 or 8, is characterized in that this steps d) be to carry out in host side, and in steps d) also comprise afterwards:
From this main frame by poor the channel time delay bandwidth to be measured this terminal to be measured of notifying; And
Poor at this terminal storage channel time delay to be measured.
11. methods as claimed in claim 6, is characterized in that, a) also comprise before in step: this main frame receives center frequency point f
c, bandwidth one or more to be measured within the scope of this bandwidth varying and this terminal to be measured based on the setting of communication system types.
12. methods as claimed in claim 11, is characterized in that, this main frame according to this terminal to be measured based on communication system types arrange calculate this frequency modulating signal.
13. the method for claim 1, is characterized in that, this terminal to be measured based on communication system comprise LTE system.
The system of 14. 1 kinds of test channel delay inequalities, in order to test the inner passage delay inequality of a terminal to be measured, comprising:
Instrument, in order to send a FM signal;
Main frame, connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
efM signal, and notify this terminal to be measured based on center frequency point f
cwith the bandwidth B to be measured within the scope of a bandwidth varying
ireceive signal, then according to the fixed phase under the selected bandwidth of one within the scope of this bandwidth varying
the phase place of the reception signal returning with this terminal to be measured
calculate phase difference, and poor with respect to the channel time delay of this selected bandwidth according to this bandwidth to be measured of this phase difference calculating,
Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle be greater than the largest passages time delay of this terminal inner to be measured.
15. systems as claimed in claim 14, is characterized in that, this main frame also provides an operation interface, for receiving center frequency point f
c, bandwidth one or more to be measured within the scope of this bandwidth varying and this terminal to be measured based on the setting of communication system types.
16. systems as claimed in claim 14, is characterized in that, this main frame is also for determining whether to have traveled through the bandwidth to be measured within the scope of a bandwidth varying, if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
17. systems as described in claim 14 or 16, is characterized in that, this main frame is also for by poor the channel time delay under each bandwidth to be measured this terminal to be measured of notifying.
18. systems as claimed in claim 14, is characterized in that, this terminal to be measured based on communication system comprise LTE system.
The system of 19. 1 kinds of test channel delay inequalities, in order to test the inner passage delay inequality of a terminal to be measured, comprising:
Instrument, in order to send a FM signal;
Main frame, connects this instrument and this terminal to be measured, and this main frame is f in order to notify this instrument to send carrier frequency to this terminal to be measured
c, and frequency modulating signal is f
efM signal, and notify this terminal to be measured based on center frequency point f
cwith the bandwidth B to be measured within the scope of a bandwidth varying
ireceive signal;
Wherein, receive in this terminal to be measured, measure the phase place that receives signal
and this terminal to be measured is according to the fixed phase under the selected bandwidth of one within the scope of this bandwidth varying
with this phase place
calculate phase difference, then poor with respect to the channel time delay of this selected bandwidth according to this bandwidth to be measured of this phase difference calculating;
Wherein this terminal to be measured based on the frame length of communication system be this modulation signal cycle positive integer doubly, and this modulation signal cycle be greater than the largest passages time delay of this terminal inner to be measured.
20. systems as claimed in claim 19, is characterized in that, this main frame also provides an operation interface, for receiving center frequency point f
c, bandwidth one or more to be measured within the scope of this bandwidth varying and this terminal to be measured based on the setting of communication system types.
21. systems as claimed in claim 19, is characterized in that, this main frame is also for determining whether to have traveled through the bandwidth to be measured within the scope of a bandwidth varying, if do not traveled through bandwidth to be measured, this main frame is changed bandwidth B to be measured
i, and restart test.
22. systems as claimed in claim 19, is characterized in that, this terminal to be measured based on communication system comprise LTE system.
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| CN103916199B (en) * | 2014-03-18 | 2016-08-24 | 中国科学院国家天文台 | The time delay of a kind of aerial signal and phase adjusting apparatus and method |
| CN108632979B (en) * | 2017-03-20 | 2022-04-05 | 中兴通讯股份有限公司 | Method, device and equipment for optimizing time synchronization error |
| CN107222271B (en) * | 2017-05-15 | 2020-05-15 | 中国科学院国家授时中心 | Long-wave ground wave time delay prediction method based on double-frequency/multi-frequency time delay difference measurement |
| CN111064532B (en) * | 2019-12-23 | 2022-08-12 | 北京航天益森风洞工程技术有限公司 | Transmission delay test method and system for unmanned platform remote control and remote measurement data system |
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