CN1616975A - Frequency spectrum detecting system - Google Patents
Frequency spectrum detecting system Download PDFInfo
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- CN1616975A CN1616975A CN 200310113582 CN200310113582A CN1616975A CN 1616975 A CN1616975 A CN 1616975A CN 200310113582 CN200310113582 CN 200310113582 CN 200310113582 A CN200310113582 A CN 200310113582A CN 1616975 A CN1616975 A CN 1616975A
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- 238000012937 correction Methods 0.000 claims description 17
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- 238000010183 spectrum analysis Methods 0.000 abstract 1
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Abstract
The frequency spectrum measuring system includes successively connected one pre-amplifier for receiving and amplifying input radio signal; one frequency demultiplier for reducing the frequency of the amplified signal to form IF signal; one IF filter for filtering the IF signal in set frequency resolution and IF frequency; one power meter for measuring the power of the IF signal; and one PC for reading the power data the power meter measures, converting the read frequency into practical frequency based on set frequency spectrum signal correcting list, and drawing the frequency spectrum analysis diagram of power vs frequency.
Description
Technical field
The present invention relates to a kind of amount of frequency spectrum examining system, relate in particular to a kind of amount of frequency spectrum examining system of forming by personal computer and power meter.
Technical background
In recent years, (Internet) is flourish for world-wide web, especially World Wide Web (be called for short WWW), except traditional mail transfer service is provided, also combining multimedia services miscellaneous such as voice, picture and dynamic image, be accompanied by these multimedia services and come, is very huge data quantity, therefore various high efficiency network communication product arises at the historic moment, and wherein attracted attention by market with radio communication product especially.
Press, the wireless telecommunications merchant is for design and produce high-quality radio communication product, and guarantee the requirement all up to specification of the shared channel size of these communication products, all can be before these radio communication products dispatch from the factory, it is carried out the measurement and the analysis of frequency spectrum signal, with the product of guaranteeing to manufacture, be the non-defective unit of requirement up to specification.For reaching this purpose, the dealer all must expend huge fund, on each production line, set up a spectrum measurement station, a spectrum analyzer (Spectrum Analyzer) all need be installed in each spectrum measurement station, to utilize the radio communication product of this spectrum analyzer, carry out the measurement and the analysis of frequency spectrum signal to completing.
Generally speaking, each one all need expend huge funds in order to carry out the spectrum analyzer that frequency spectrum measures, so on several production lines, set up a spectrum measurement station respectively, often need spend nearly ten million even surpass ten million expense, cause the cost that sets up of production line can not to be in any more all the time, be difficult to reduce, for manufacturer, naturally the stepping back of prestige, and dare not suddenly expand production line, to increase production capacity, cause the order full load, normal thereby incured loss through delay time of product turnout.
Summary of the invention
A purpose of the present invention, be to utilize an amplifier in advance, the signal that one radio communication product to be measured is imported, amplify in advance, this input signal after a frequency demultiplier will amplify again, frequency reducing becomes intermediate frequency signal, again via an intermediate-frequency filter, frequency spectrum resolution according to setting carries out intermediate frequency filtering to it, measures its performance number by a power meter again, at last, utilize a personal computer to read the power data that this power meter measures again, and with the detection frequency that is read, according to a frequency spectrum signal table of corrections of setting up in advance, be converted to actual frequency, again with this actual frequency as frequency axis, as power shaft, can draw out the frequency spectrum signal analysis chart of this radio communication product to be measured with this power data.
Another object of the present invention, be in this amount of frequency spectrum examining system, be provided with the one scan circuit, this personal computer can be according to the input signal of this radio communication product to be measured and required IF-FRE when detecting, control this sweep circuit and produce required waveform, to control the oscillation frequency of a voltage controlled oscillator, make this voltage controlled oscillator produce one and in scheduled frequency range, be the local oscillating frequency that linearity is come flyback retrace.
Another purpose of the present invention, be when setting up the table of corrections of this frequency spectrum signal, be to have finished one to detect and equal certain a series of radio communication products of requirement up to specification of channel size, be connected with this amount of frequency spectrum examining system of the present invention, this personal computer can be according to sweep frequency that is read and power data, with the known actual spectrum signal of this radio communication product, contrast forms a required frequency spectrum signal table of corrections.
A kind of amount of frequency spectrum examining system comprises:
One amplifier in advance in order to receiving the signal that a radio communication product to be measured is imported, and amplifies in advance to this input signal;
One frequency demultiplier, be with this in advance amplifier be connected, become intermediate frequency signal in order to this input signal frequency reducing after will amplifying;
One intermediate-frequency filter is to be connected with this frequency demultiplier, in order to this intermediate frequency signal, according to the frequency resolution degree and the IF-FRE that set, carries out intermediate frequency filtering;
One power meter is to be connected with this intermediate-frequency filter, comes out in order to the power measurement with this intermediate frequency signal;
One personal computer is to be connected with this power meter by a control interface, in order to reading the power data that this power meter measures, and with the detection frequency that is read, complies with a frequency spectrum signal table of corrections of foundation in advance, is converted to actual frequency.Again with this actual frequency as frequency axis, as power shaft, draw out the frequency spectrum signal analysis chart of this radio communication product to be measured with this power data.
Described amount of frequency spectrum examining system also comprises:
The one scan circuit is to be connected with this personal computer by another control interface, to accept the control of this personal computer, produces required waveform;
One voltage controlled oscillator is to be connected with this sweep circuit, and complies with this waveform that this sweep circuit transmits, control its oscillation frequency, in scheduled frequency range, be the local oscillating frequency that linearity is come flyback retrace to produce one, and be sent to this frequency demultiplier, carry out smear with this intermediate frequency signal.
Described frequency spectrum signal table of corrections is to have finished one to detect and equal certain a series of radio communication products of requirement up to specification of channel size, be connected with this amount of frequency spectrum examining system, make this personal computer can be according to the detection frequency spectrum signal that is read, with the known actual spectrum signal of this radio communication product, contrast forms a required frequency spectrum signal table of corrections.
When described amount of frequency spectrum examining system detects this radio communication product to be measured, this personal computer is to control the interface by this another, send the expectant control signal, make this sweep circuit produce required waveform, be created in and be the oscillation frequency that linearity is come flyback retrace in this scheduled frequency range to control this voltage controlled oscillator, make the signal that this radio communication product to be measured is imported, after amplifier amplifies in advance in advance by this, after the oscillation frequency smear frequency reducing that this frequency demultiplier and this voltage controlled oscillator produced, again through this intermediate-frequency filter filtering, can obtain the detection spectrum value of required frequency resolution degree and centre frequency, come out by the power measurement of this power meter with this intermediate frequency signal, this personal computer promptly may be read into the detection frequency and the power data of this radio communication product to be measured again.
Described personal computer can be according to the detection frequency and the power data that are read, detect frequency as frequency axis with this, with this power data as power shaft, draw out the frequency spectrum signal detection figure of this radio communication product to be measured, this frequency spectrum signal detects figure via this frequency spectrum signal table of corrections, to detect frequency inverted is actual frequency, can produce the actual spectrum signal analysis chart of this radio communication product to be measured according to this.
A kind of amount of frequency spectrum examining system of forming by personal computer and power meter provided by the present invention, have low-cost, easy and simple to handle and the easy characteristics of maintenance, can effectively reduce radio communication product required a large amount of and expensive testing tool purchase cost in the automated production process, with effective lifting competitiveness of product.
Description of drawings
Shown in Figure 1 is the circuit box synoptic diagram of amount of frequency spectrum examining system of the present invention;
Shown in Figure 2 is the actual spectrum signal analysis chart of the produced wireless network card to be measured of a preferred embodiment of the present invention.
The conventional letter of major part:
Radio communication product ... ... 10 amplifiers in advance ... ... 20
Frequency demultiplier ... ... 21 intermediate-frequency filters ... ... 22
Power meter ... ... 30 control interfaces ... ... 31
Another controls the interface ... ... 40 sweep circuits ... ... 41
Voltage controlled oscillator ... ... 42 personal computers ... ... .50
Embodiment
The present invention is a kind of amount of frequency spectrum examining system, refers to a kind of construction cost that can be extremely low especially, utilize common on the market spare part and power meter in addition assembly the personal computer of arranging in pairs or groups again, the amount of frequency spectrum examining system of producing are installed.
The present invention is a kind of amount of frequency spectrum examining system of being made up of personal computer and power meter, consult shown in Figure 1, this amount of frequency spectrum examining system is to utilize an amplifier (preamplifier) 20 in advance, receive the signal that a radio communication product 10 to be measured is imported, and this input signal amplified in advance, again through a frequency demultiplier (DownConverter) 21, this input signal frequency reducing after amplifying is become intermediate frequency signal, this intermediate frequency signal is again via an intermediate-frequency filter (IF Filter) 22, according to the frequency resolution degree that sets, it is carried out intermediate frequency filtering, required intermediate frequency signal when detecting this radio communication product 10, by a power meter (PowerMeter) 30, the power measurement of this intermediate frequency signal can be come out again.Therefore, only need utilize a personal computer 50 more in the present invention, by a control interface (Control Interface) 31, read the power data that this power meter 30 is measured, and with the detection frequency that is read, according to a frequency spectrum signal table of corrections of setting up in advance, be converted to actual frequency, again with this actual frequency as frequency axis, as power shaft, can draw out the frequency spectrum signal analysis chart of this radio communication product to be measured with this power data.
Wherein, described frequency demultiplier, the principle of work of its frequency reducing mainly is the RF high-frequency signals (f with input
RF) and local concussion frequency (f
LO) import the signal that frequency that a nonlinear element (as diode) produces is subtracted each other respectively:
Asin(f
RF)×Bcos(f
LO)＝C(sin(f
RF+f
LO)+sin(f
RF-f
LO))，
C=AB/2 wherein, and sin (f
RF-f
LO) composition be the IF-FRE that the RF high-frequency signals deducts local oscillating frequency.
The frequency of described intermediate frequency signal deducts the value of local oscillating frequency for the RF high-frequency signals, and its frequency ratio RF high-frequency signals is lower, helps directly handling with general electronic circuit, need not consider complicated high frequency spurious effects, can improve the accuracy of measurement; The frequency range of the intermediate frequency signal among this case embodiment is between the 300MHZ to 500MHZ.
In addition, described control interface 31 mainly is the standard interface that power meter provided, 4418B with Agilent is an example, support GPLB, RS232, and Ethernet (Ethernet) socket, it mainly acts on is by GPLB, the performance number that RS232 or Ethernet line come the readout power meter to be measured.
The present invention is when detecting this radio communication product 10, influence the authenticity of frequency spectrum signal testing result for the cumulative errors of avoiding producing by each element, then before treating testing product and detecting, must carry out system compensation (Calibration) to this amount of frequency spectrum examining system earlier, to set up a frequency spectrum signal table of corrections (Calibration Table).Therefore, in this amount of frequency spectrum examining system, other is provided with one scan circuit (Sweeper) 41, this sweep circuit 41 is to be connected with this personal computer 50 by another control interface (Control Interface) 40, to accept the control of this personal computer 50, produce required waveform (as: sawtooth wave), and waveform is sent to a voltage controlled oscillator 42 (VOC), to control the oscillation frequency of this voltage controlled oscillator 42, make this voltage controlled oscillator 42 produce one and in scheduled frequency range, be the local oscillating frequency that linearity is come flyback retrace, therefore, essential input signal and the required IF-FRE when detecting according to this radio communication product 10 to be measured of this personal computer 50, control this sweep circuit 41, the waveform that this sweep circuit 41 is produced can make this voltage controlled oscillator 42 produce the oscillation frequency of required frequency range.
Described another control interface 40, Printer Port (print.er port) interface that its main composition element is a Standard PC, it mainly acts on is with signal, is sent to sweep circuit as Sclk, Sdata, synthetic (FrequencySynthesize) the required controlling signal of Sen equifrequent.Wherein the main composition of this sweep circuit is the phase-locked loop, Phase-lock loop.
The present invention is when setting up this frequency spectrum signal table of corrections (Calibration Table), be to have finished one to detect and equal certain a series of radio communication products 10 of requirement up to specification of channel size, be connected with this amount of frequency spectrum examining system of the present invention, make this personal computer 50 can be according to the detection frequency spectrum signal that is read, with the known actual spectrum signal of this radio communication product 10, contrast forms a required frequency spectrum signal table of corrections.In a preferred embodiment of the present invention, this amount of frequency spectrum examining system is to have finished at one earlier to detect and the equal 802.11b wireless network card of requirement up to specification of channel size, detect, make this personal computer 50 according to centre frequency 2412MHZ known on this wireless network card, control interface 40 by this another, send a controlling signal, make this sweep circuit 41 produce a required waveform, produce one and come the oscillation frequency of flyback retrace to being linearity between 2412MHZ-150MHZ+22MHZ to control this voltage controlled oscillator 42 at 2412MHZ-150MHZ-22MHZ, at this moment, this wireless network card inputs to this signal of amplifier 20 in advance, after amplifying in advance, the oscillation frequency smear that is produced through this frequency demultiplier 21 (or mixer) and this voltage controlled oscillator 42 again, at this moment, if it is 150MHZ that frequency setting is detected at the center of this intermediate-frequency filter 22, and frequency range is set at 1MHZ, then frequency reducing becomes the input signal of intermediate frequency signal, after these intermediate-frequency filter 22 filtering, to obtain the frequency resolution degree is 1MHZ, and centre frequency is the detection frequency spectrum signal of 150MHZ, with the known actual spectrum signal of this wireless network card, contrast one of forms shown in the following table frequency spectrum signal table of corrections:
| Actual frequency (MHZ) | 2390 | ?2391 | ?2392 | ?2393 | ?2394 | ?2395 | ?2396 | ?2397 | ?2398 | ?2399 | ?2400 |
| Detect frequency (MHZ) | 128 | ?129 | ?130 | ?131 | ?132 | ?133 | ?134 | ?135 | ?136 | ?137 | ?138 |
| Actual frequency (MHZ) | 2401 | ?2402 | ?2403 | ?2404 | ?2405 | ?2406 | ?2407 | ?2408 | ?2409 | ?2410 | ?2411 |
| Detect frequency (MHZ) | 139 | ?140 | ?141 | ?142 | ?143 | ?144 | ?145 | ?146 | ?147 | ?148 | ?149 |
| Actual frequency (MHZ) | 2412 | ?2413 | ?2414 | ?2415 | ?2416 | ?2417 | ?2418 | ?2419 | ?2420 | ?2421 | ?2422 |
| Detect frequency (MHZ) | 150 | ?151 | ?152 | ?153 | ?154 | ?155 | ?156 | ?157 | ?158 | ?159 | ?160 |
| Actual frequency (MHZ) | 2423 | ?2424 | ?2425 | ?2426 | ?2427 | ?2428 | ?2429 | ?2430 | ?2431 | ?2432 | ?2433 |
| Detect frequency (MHZ) | 161 | ?162 | ?163 | ?164 | ?165 | ?166 | ?167 | ?168 | ?169 | ?170 | ?171 |
| Actual frequency (MHZ) | 2434 | ||||||||||
| Detect frequency (MHZ) | 172 | ||||||||||
So, when using this amount of frequency spectrum examining system to a series of wireless network cards to be measured, when detecting, can make this personal computer 50 control interface 40 by this another, send identical controlling signal, make this sweep circuit 41 produce required waveform, produce one and come the oscillation frequency of flyback retrace to being linearity between 2412MHZ-150MHZ+22MHZ to control this voltage controlled oscillator 42 at 2412MHZ-150MHZ-22MHZ, make the signal that this wireless network card is imported, after amplifier 20 amplifies in advance in advance by this, after the oscillation frequency smear frequency reducing that this frequency demultiplier 21 and this voltage controlled oscillator 42 are produced, again through these intermediate-frequency filter 22 filtering, can obtain the frequency resolution degree is 1MHZ, and centre frequency is the detection spectrum value of 150MHZ, and then come out by the power measurement of this frequency meter 30 (Power Meter) with this intermediate frequency signal, this personal computer 50 promptly may be read into the detection frequency and the power data of this wireless network card to be measured shown in the following table:
| Detect frequency (MHZ) | ??128 | ??129 | ??130 | ??131 | ??132 | ??133 | ??134 | ??135 | ??136 | ??137 | ??138 |
| Power (dBm) | ??-35 | ??-33 | ??-28 | ??-24 | ??-20 | ??-16 | ??-14 | ??-13 | ??-14 | ??-14 | ??-16 |
| Detect frequency (MHZ) | ??139 | ??140 | ??141 | ??142 | ??143 | ??144 | ??145 | ??146 | ??147 | ??148 | ??149 |
| Power (dBm) | ??-20 | ??-26 | ??-10 | ??5 | ??10 | ??14 | ??17 | ??18 | ??19 | ??18 | ??19 |
| Detect frequency (MHZ) | ??150 | ??151 | ??152 | ??153 | ??154 | ??155 | ??156 | ??157 | ??158 | ??159 | ??160 |
| Power (dBm) | ??19 | ??19.1 | ??18.2 | ??18.5 | ??18 | ??16 | ??15 | ??10 | ??0 | ??-10 | ??-25 |
| Detect frequency (MHZ) | ??161 | ??162 | ??163 | ??164 | ??165 | ??166 | ??167 | ??168 | ??169 | ??170 | ??171 |
| Power (dBm) | ??-20 | ??-18 | ??-15 | ??-14 | ??-13 | ??-14 | ??-15 | ??-17 | ??-20 | ??-25 | ??-30 |
| Detect frequency (MHZ) | ??172 | ||||||||||
| Power (dBm) | ??-35 | ||||||||||
At this moment, this personal computer 50 can be according to the detection frequency and the power data that are read, detect frequency as X-axis with this, promptly be equivalent to frequency axis, with this power data as Y-axis, promptly be equivalent to power shaft, draw out the frequency spectrum signal detection figure of this wireless network card to be measured, this frequency spectrum signal detects figure via the aforementioned frequency spectrum signal table of corrections of setting up in advance, can be actual frequency with detecting frequency inverted, and produce the actual spectrum signal analysis chart of this wireless network card to be measured according to this, consult shown in Figure 2.
According to the above as can be known, the present invention only need utilize common on the market spare part in addition assembly install, the personal computer of arranging in pairs or groups again, i.e. construction cost that can be extremely low, produce required amount of frequency spectrum examining system, this amount of frequency spectrum examining system is not only easy and simple to handle, obtaining of each correlated parts, assembling and maintenance are easily, and sweep frequency that is measured and power data, and this made actual spectrum signal analysis chart, all be enough to design and manufacturer, in order to detecting the shared channel size of various radio communication product, and judged whether requirement up to specification according to this as each radio communication product.
Because the aforementioned conventional spectrum analyzer costs an arm and a leg, cause the too high problem of radio communication product manufacturing cost, the inventor is according to for many years practical experience and research experience, develop a kind of amount of frequency spectrum examining system of forming by personal computer and power meter of the present invention, expectation is by the low cost of this amount of frequency spectrum examining system, the easy and simple to handle and easy characteristics of maintenance, effectively reduce radio communication product required a large amount of and expensive testing tool purchase cost in the automated production process, with effective lifting competitiveness of product.
The above only is preferred embodiment of the present invention, but interest field of the present invention is not limited thereto, and allly is familiar with this skill personage, according to the disclosed technology contents of the present invention, can think easily and equivalence change, all should not break away from protection category of the present invention.
Claims (5)
1, a kind of amount of frequency spectrum examining system is characterized in that comprising:
One amplifier in advance in order to receiving the signal that a radio communication product to be measured is imported, and amplifies in advance to this input signal;
One frequency demultiplier, be with this in advance amplifier be connected, become intermediate frequency signal in order to this input signal frequency reducing after will amplifying;
One intermediate-frequency filter is to be connected with this frequency demultiplier, in order to this intermediate frequency signal, according to the frequency resolution degree and the IF-FRE that set, carries out intermediate frequency filtering;
One power meter is to be connected with this intermediate-frequency filter, comes out in order to the power measurement with this intermediate frequency signal;
One personal computer, be to be connected with this power meter by a control interface, in order to read the power data that this power meter measures, and with the detection frequency that is read, frequency spectrum signal table of corrections according to setting up in advance is converted to actual frequency, again with this actual frequency as frequency axis, as power shaft, draw out the frequency spectrum signal analysis chart of this radio communication product to be measured with this power data.
2, amount of frequency spectrum examining system as claimed in claim 1 is characterized in that also comprising:
The one scan circuit is to be connected with this personal computer by another control interface, to accept the control of this personal computer, produces required waveform;
One voltage controlled oscillator is to be connected with this sweep circuit, and complies with this waveform that this sweep circuit transmits, control its oscillation frequency, in scheduled frequency range, be the local oscillating frequency that linearity is come flyback retrace to produce one, and be sent to this frequency demultiplier, carry out smear with this intermediate frequency signal.
3, amount of frequency spectrum examining system as claimed in claim 2, it is characterized in that: described frequency spectrum signal table of corrections is to have finished one to detect and equal certain a series of radio communication products of requirement up to specification of channel size, be connected with this amount of frequency spectrum examining system, make this personal computer can be according to the detection frequency spectrum signal that is read, with the known actual spectrum signal of this radio communication product, contrast forms a required frequency spectrum signal table of corrections.
4, amount of frequency spectrum examining system as claimed in claim 2, it is characterized in that: when this amount of frequency spectrum examining system detects this radio communication product to be measured, this personal computer is to control the interface by this another, send the expectant control signal, make this sweep circuit produce required waveform, be created in and be the oscillation frequency that linearity is come flyback retrace in this scheduled frequency range to control this voltage controlled oscillator, make the signal that this radio communication product to be measured is imported, after amplifier amplifies in advance in advance by this, after the oscillation frequency smear frequency reducing that this frequency demultiplier and this voltage controlled oscillator produced, again through this intermediate-frequency filter filtering, can obtain the detection spectrum value of required frequency resolution degree and centre frequency, come out by the power measurement of this power meter with this intermediate frequency signal, this personal computer promptly may be read into the detection frequency and the power data of this radio communication product to be measured again.
5, amount of frequency spectrum examining system as claimed in claim 4, it is characterized in that: this personal computer can be according to the detection frequency and the power data that are read, detect frequency as frequency axis with this, with this power data as power shaft, draw out the frequency spectrum signal detection figure of this radio communication product to be measured, this frequency spectrum signal detects figure via this frequency spectrum signal table of corrections, and will detect frequency inverted is actual frequency, can produce the actual spectrum signal analysis chart of this radio communication product to be measured according to this.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310113582 CN1616975A (en) | 2003-11-14 | 2003-11-14 | Frequency spectrum detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310113582 CN1616975A (en) | 2003-11-14 | 2003-11-14 | Frequency spectrum detecting system |
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| Publication Number | Publication Date |
|---|---|
| CN1616975A true CN1616975A (en) | 2005-05-18 |
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|---|---|---|---|
| CN 200310113582 Pending CN1616975A (en) | 2003-11-14 | 2003-11-14 | Frequency spectrum detecting system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147429A (en) * | 2011-02-28 | 2011-08-10 | 中国科学院国家天文台 | Broadband microwave power meter and interference signal filtering method |
| CN102707142A (en) * | 2012-05-23 | 2012-10-03 | 广东电网公司电力科学研究院 | Frequency spectrum analyzing method and device of control object |
| CN101038311B (en) * | 2006-03-14 | 2012-11-14 | 日本电气株式会社 | Radio monitoring apparatus and method |
| CN1959420B (en) * | 2005-11-04 | 2016-09-07 | 特克特朗尼克公司 | The measurement apparatus of time arbitrary signal power statistics and method |
-
2003
- 2003-11-14 CN CN 200310113582 patent/CN1616975A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1959420B (en) * | 2005-11-04 | 2016-09-07 | 特克特朗尼克公司 | The measurement apparatus of time arbitrary signal power statistics and method |
| CN101038311B (en) * | 2006-03-14 | 2012-11-14 | 日本电气株式会社 | Radio monitoring apparatus and method |
| CN102147429A (en) * | 2011-02-28 | 2011-08-10 | 中国科学院国家天文台 | Broadband microwave power meter and interference signal filtering method |
| CN102147429B (en) * | 2011-02-28 | 2013-04-24 | 中国科学院国家天文台 | Broadband microwave power meter and interference signal filtering method |
| CN102707142A (en) * | 2012-05-23 | 2012-10-03 | 广东电网公司电力科学研究院 | Frequency spectrum analyzing method and device of control object |
| CN102707142B (en) * | 2012-05-23 | 2015-02-11 | 广东电网公司电力科学研究院 | Frequency spectrum analyzing method and device of control object |
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