CN101094010A - A receiver - Google Patents

A receiver Download PDF

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Publication number
CN101094010A
CN101094010A CNA2007100283570A CN200710028357A CN101094010A CN 101094010 A CN101094010 A CN 101094010A CN A2007100283570 A CNA2007100283570 A CN A2007100283570A CN 200710028357 A CN200710028357 A CN 200710028357A CN 101094010 A CN101094010 A CN 101094010A
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CN
China
Prior art keywords
frequency
pass filter
band pass
receiver
signals according
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Pending
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CNA2007100283570A
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Chinese (zh)
Inventor
孙炼
谢继东
朱彤
白波
赵来定
许杨
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China Mobile Group Guangdong Co Ltd
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China Mobile Group Guangdong Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by China Mobile Group Guangdong Co Ltd filed Critical China Mobile Group Guangdong Co Ltd
Priority to CNA2007100283570A priority Critical patent/CN101094010A/en
Publication of CN101094010A publication Critical patent/CN101094010A/en
Pending legal-status Critical Current

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Abstract

The receiver include first band-pass filter, first unit of generating local oscillation signal, first mixer, second band-pass filter, second unit of generating local oscillation signal, second mixer, third band-pass filter, and intermediate frequency detector. The disclosed receiver can raise receiving sensitivity of receiver effectively, and realize real time tracking and capturing signal frequency point of satellite beacon in high efficiency and rapidly.

Description

A kind of receiver
Technical field
The present invention relates to the communications field, be specifically related to the beacon track receiver in a kind of satellite communication system.
Background technology
In mobile communication system based on satellite technology, utilize the Ku band transponder realization portable terminal of geostationary satellite (CEO) and the radio communication service between fixed terminal or the portable terminal, as " communication in moving " vehicle-mounted mobile communication system by installation satellite communication antena on the automobile platform.Its key technology difficult problem is when carrying overall height speed motion, a climb and fall, jolt, under the complex conditions such as turning, how to catch, follow the tracks of communication satellite fast, and guarantees that car antenna accurately aims at communication satellite in real time.
To the catching and following the tracks of of communication satellite, can realize by beacon tracking strategy or envelope-tracking strategy.With respect to envelope-tracking, beacon is followed the tracks of has higher reliability, but the structural design of beacon receiver is comparatively complicated, because the beacon signal of satellite itself is some signal (smaller bandwidth frequently, approach zero), and the frequency drift that has the frequency drift of self and produced by factor such as atmospheric interference, too wide if the default intermediate frequency of receiver receives bandwidth, then can influence the received signal to noise ratio performance of receiver, thereby cause the sensitivity of receiving system to descend.If but that default intermediate frequency receives bandwidth is too narrow, then can lose beacon signal again, therefore, under the prerequisite that guarantees higher receiving sensitivity, in real time, effectively realize to the beacon signal frequency tracking, catch satellite communication seemed particularly important.
Summary of the invention
Have mirror therewith, embodiment of the invention technical problem to be solved is, a kind of receiver is provided, and can guarantee higher the reception under the sensitive prerequisite of reading, effectively realize to the satellite beacon signals frequency real-time tracking, catch.
In order to solve the problems of the technologies described above, a kind of receiver of the embodiment of the invention comprises:
First band pass filter (11) carries out bandpass filtering to received radio wave signal;
The first oscillation signals according generation unit (12) is used to produce first oscillation signals according;
First frequency mixer (13) is used for the output of described first band pass filter and the described first oscillation signals according mixing;
Second band pass filter (14) is used for the output of described first frequency mixer is carried out filtering to export first intermediate-freuqncy signal;
The second oscillation signals according generation unit (16) is used for obtaining frequency shift (FS) from described first intermediate-freuqncy signal, and produces second oscillation signals according according to described frequency shift (FS);
Second frequency mixer (18) is used for described first intermediate-freuqncy signal and the described second oscillation signals according mixing;
The 3rd band pass filter (19) is used for the output of described second frequency mixer is carried out filtering to export second intermediate-freuqncy signal;
Intermediate frequency wave detector (24) is used for described second intermediate-freuqncy signal is carried out detection to obtain the beacon signal intensity information of described second intermediate-freuqncy signal.
Preferably, the described second oscillation signals according generation unit comprises:
First local oscillator (161) is used to produce the 3rd oscillation signals according;
Three-mixer (160) is used for described first intermediate-freuqncy signal and described the 3rd oscillation signals according mixing;
Four-tape bandpass filter (163) is used for the output of described three-mixer is carried out filtering to export the 3rd intermediate-freuqncy signal;
Tracking loop circuit (164) is connected with described four-tape bandpass filter, and the frequency that is used to follow the tracks of described the 3rd intermediate-freuqncy signal to be obtaining frequency offset information, and adjusts signal according to the frequency offset information generated frequency;
Second local oscillator (166) is used to produce the 4th oscillation signals according;
The 4th frequency mixer (165) is used for described frequency adjusted signal and the 4th oscillation signals according mixing;
The 5th band pass filter (167) is used for the output of described the 4th frequency mixer is carried out filtering so that described second oscillation signals according to be provided.
Preferably, the described second oscillation signals according generation unit also comprises:
First amplifier (162) is arranged between described three-mixer and the described four-tape bandpass filter output that is used to amplify described three-mixer;
Second amplifier (168) is arranged between described the 5th band pass filter and described second frequency mixer output that is used to amplify described the 5th band pass filter.
Preferably, the described second oscillation signals according generation unit further comprises:
The 6th band pass filter (169) is arranged between described second amplifier and described second frequency mixer, is used for the output of described second amplifier is carried out filtering so that described second oscillation signals according to be provided.
Preferably, the described first oscillation signals according generation unit comprises frequency synthesizer and the 3rd local oscillator, wherein:
Frequency synthesizer (121) is used for producing frequency signal according to the frequency point information of beacon signal;
The 3rd local oscillator (122) is used for frequency signal to the output of described frequency synthesizer and carries out frequency multiplication and amplify to generate described first oscillation signals according.
Preferably, described frequency synthesizer is the DDS Direct Digital Frequency Synthesizers.
Preferably, described receiver also comprises the 3rd amplifier (20), is arranged between described the 3rd band pass filter and the described intermediate frequency wave detector output that is used to amplify described the 3rd band pass filter;
Diverter switch (21);
At least two band pass filters that bandwidth is different, the output of described band pass filter is connected with described intermediate frequency wave detector;
The input of described diverter switch is connected with described the 3rd amplifier, and its output optionally is connected to the output of described the 3rd amplifier one of them in the different band pass filter of described at least two bandwidth.
Preferably, it is characterized in that described receiver also comprises:
The 4th amplifier (15) is arranged between described second band pass filter and described second frequency mixer output that is used to amplify described the secondth band pass filter.
Preferably, described receiver further comprises:
The 7th band pass filter (17) is arranged between described the 4th amplifier and described second frequency mixer, is used for filtering is carried out in the output of described first amplifier.
Preferably, described receiver further comprises:
Control unit (25) is used for the beacon signal intensity information of described intermediate frequency detection unit output is carried out respective handling.
Preferably, described frequency synthesizer is according to the synthetic described frequency signal of eight fractional frequency signals that comes from the frequency point information of described control unit and come from described the 4th oscillation signals according of described second local oscillator.
Preferably, described control unit is controlled described diverter switch and optionally the output of described the 3rd amplifier is connected in the different band pass filter of described at least two bandwidth one of them.
Implement the receiver of the embodiment of the invention, can effectively improve the receiving sensitivity of receiver, realize efficiently, fast to satellite beacon signals real-time tracking, catch.
Description of drawings
Fig. 1 is that the receiver of the embodiment of the invention is formed schematic diagram;
Embodiment
In order to make technical scheme of the present invention and advantage clearer, the embodiment of the invention is further elaborated below in conjunction with the accompanying drawing embodiment that develops simultaneously.
As shown in Figure 1, be the structural representation of a kind of receiver of the present invention.Described receiver comprises:
First band pass filter 11 carries out bandpass filtering to received radio wave signal.
Consider the satellite beacon signals frequency allocation herein, and for the sealing in of the movable signal that suppresses to concentrate on 800~850MHz frequency range, described first band pass filter, 11 filtering Frequency Band Selection are at 950~1450MHz.
The first oscillation signals according generation unit 12 is used to produce first oscillation signals according.
Herein, during concrete enforcement, the described first oscillation signals according generation unit 12 comprises frequency synthesizer 122 and the 3rd local oscillator 121, wherein said frequency synthesizer 121, be used for producing frequency signal according to the frequency point information of beacon signal, the present invention selects the DDS digital frequency synthesizer to realize described frequency synthesizer 122 when specific implementation; Described the 3rd local oscillator 121 is used for frequency signal to 122 outputs of described frequency synthesizer and carries out frequency multiplication and amplify to generate described first oscillation signals according.
First frequency mixer 13 is used for the output of described first band pass filter and the described first oscillation signals according mixing.
Second band pass filter 14 is used for the output of described first frequency mixer 13 is carried out filtering to export first intermediate-freuqncy signal.
Herein, during concrete enforcement, the centre frequency of described first intermediate-freuqncy signal is chosen in 817.5MHz, the working frequency range of described the 3rd local oscillator 121 is chosen in 1767.5~2267.5MHz, described second band pass filter 14 carries out filtering with the output of described first frequency mixer 13 and obtains its down-conversion signal, during specific implementation, described second band pass filter selects centre frequency at 817.5MHz, bandwidth is the band pass filter of 25MHz, those skilled in the art should be clear, described accurate intermediate frequency (817.5MHz) and band pass filter bandwidth parameters such as (25MHz) are selected only a kind of scheme, those skilled in the art are under thought of the present invention, to substituting of the selection of parameter, conversion also belongs in the scope of the present invention certainly, similarly, also has the parameter of subsequent descriptions in the embodiment of the invention to select.
The second oscillation signals according generation unit 16 is used for obtaining frequency shift (FS) from described first intermediate-freuqncy signal, and produces second oscillation signals according according to described frequency shift (FS).
Herein, when specifically implementing, the described second oscillation signals according generation unit 16 comprises:
First local oscillator 161 is used to produce the 3rd oscillation signals according.
Herein, when specifically implementing, described the 3rd oscillation signals according is selected 882.5MHz.
Three-mixer 160 is used for described first intermediate-freuqncy signal and described the 3rd oscillation signals according mixing.
Four-tape bandpass filter 163 is used for the output of described three-mixer 160 is carried out filtering to export the 3rd intermediate-freuqncy signal.
Tracking loop circuit 164 is connected with described four-tape bandpass filter 163, and the frequency that is used to follow the tracks of described the 3rd intermediate-freuqncy signal to be obtaining frequency offset information, and adjusts signal according to the frequency offset information generated frequency.
During concrete enforcement, described four-tape bandpass filter 163 selects intermediate frequency at 65MHz, and bandwidth is the narrow band filter of 100KHz, selects the narrow band filter of 100KHz to help the frequency-tracking that described tracking loop circuit 164 is realized described the 3rd intermediate-freuqncy signal.Described tracking loop circuit 164 is by the frequency-tracking to described the 3rd intermediate-freuqncy signal, obtain the frequency point information of wherein entrained satellite beacon signals, again the frequency point information of described satellite beacon signals and selected the 3rd intermediate frequency (65MHz) are compared obtaining frequency offset information, and then generate described frequency adjusted signal according to selected the 3rd intermediate frequency (65MHz) and described frequency offset information.As suppose that frequency shift (FS) is Δ MHz, the frequency of the frequency adjusted signal of then described tracking loop circuit 164 outputs should be 65 ± Δ MHz, for example, in one embodiment, the frequency of the satellite beacon signals that frequency-tracking obtained of 164 pairs of described the 3rd intermediate-freuqncy signals of described tracking loop circuit (after the frequency conversion) be 65.032MHz, so frequency shift (FS) Δ=65.032MHz-65MHz=0.032MHz, the frequency of the frequency adjusted signal of tracking loop circuit 164 outputs this moment should be 65MHz-Δ MHz=65MHz-0.032MHz=64.068MHz.
Second local oscillator 166 is used to produce the 4th oscillation signals according.
Herein, when specifically implementing, described the 4th oscillation signals according is chosen in 947.5MHz.
The 4th frequency mixer 165 is used for described frequency adjusted signal and the 4th oscillation signals according mixing.
The 5th band pass filter 167 is used for the output of described the 4th frequency mixer 165 is carried out filtering so that described second oscillation signals according to be provided.
Herein, described the 5th band pass filter 167 carries out filtering with the output of described the 4th frequency mixer 165 and obtains its down-conversion signal so that described second oscillation signals according to be provided.During concrete enforcement, the frequency of described second oscillation signals according is (947.5-(65 ± Δ)) MHz=882 ± Δ MHz.It is 25MHz that described the 5th band pass filter 167 is selected bandwidth, and centre frequency is the band pass filter of 882.5MHz.
Second frequency mixer 18 is used for described first intermediate-freuqncy signal and the described second oscillation signals according mixing.
Herein, during concrete enforcement, the beacon signal frequency should be (882 ± Δ)-(817.5 ± Δ) MHz=65MHz in the down-converted component of described second frequency mixer output, under described tracking loop circuit 164 frequency-tracking ideal situations, the beacon signal frequency is basic accurately in 65MHz in the down-converted component.
The 3rd band pass filter 19 is used for the output of described second frequency mixer is carried out filtering to export second intermediate-freuqncy signal.
Herein, described the 3rd band pass filter 19 selects intermediate frequency at 65MHz, and bandwidth is the band pass filter of 4MHz.
The 3rd amplifier 20, be connected in described the 3rd band pass filter and output, the output that is used to amplify described the 3rd band pass filter.
(two band pass filters 22 shown in the accompanying drawing and 23, the output of described band pass filter is connected with described intermediate frequency wave detector the band pass filter that diverter switch 21 is different with at least two bandwidth.
Herein, the input of described diverter switch 21 is connected with described the 3rd amplifier, and its output optionally is connected to the output of described the 3rd amplifier one of them in the different band pass filter of described at least two bandwidth.
The main purpose that the different band pass filter of at least two bandwidth is set is to consider that satellite-signal is signal frequently a bit, its Frequency point may have the frequency error of the oscillation signals according of drift motion and receiver local oscillator outputs at different levels, if it is narrow that the bandwidth of band pass filter is selected, then may search for less than beacon signal, if it is excessive that bandwidth is selected, then can reduce the signal to noise ratio of receiver, compromise is considered, the invention provides a bandwidth is the band pass filter 22 of 100KHz and the band pass filter 23 that a bandwidth is 4KHz, when frequency drift relatively poor in the receiver system stability or satellite beacon signals is comparatively remarkable, selecting described bandwidth by described switching selection switch 21 is the band pass filter 22 of 100KHz, otherwise, then selecting bandwidth is the band pass filter 23 of 4KHz, to improve the sensitivity of receiver.It will be apparent to those skilled in the art; herein among the embodiment the bandwidth of band pass filter 23 of the band pass filter 22 of the 100KHz that accurately selects and 4KHz select and combination only is a kind of execution mode; in actual design; the technical staff can design the different filter of plural bandwidth; or the bandwidth of the band pass filter that changes, these changes all should belong in the present invention's scope required for protection.
Intermediate frequency wave detector 24 is used for described second intermediate-freuqncy signal is carried out detection to obtain the beacon signal intensity information of described second intermediate-freuqncy signal.
Control unit 25 is used for the beacon signal intensity information of described intermediate frequency detection unit output is carried out respective handling.
Herein, described control unit 25 also is further used for controlling described diverter switch 21 to select corresponding band pass filter, and the frequency point information that is used for importing to described frequency synthesizer 121 satellite beacon signals, so that described frequency synthesizer synthesizes described frequency signal according to described frequency point information and oneself in eight fractional frequency signals of described the 4th oscillation signals according of described second local oscillator.
Frequency divider 26 shown in Fig. 1 is and is used for and will carries out eight frequency divisions in described the 4th oscillation signals according of described second local oscillator 166 certainly, its output frequency is 947.5MHz%8=118.4375MHz, choose eight frequency divisions of described second local oscillator 166 and can save local oscillator quantity as the reference frequency of described frequency synthesizer, the design of simplified receiver improves stability.
Specific implementation, receiver provided by the present invention also includes:
The 4th amplifier 15 is arranged between described second band pass filter 14 and described second frequency mixer 17 output that is used to amplify described second band pass filter.
The 7th band pass filter 17 is arranged between described the 4th amplifier and described second frequency mixer 17, is used for filtering is carried out in the output of described first amplifier.
Herein, the main purpose that described the 4th amplifier 15 and corresponding the 7th band pass filter 17 be set is to guarantee the gain of signal and reduce noise jamming (being mainly the noise jamming of high frequency signal such as each local oscillator of receiver self).
The described second oscillation signals according generation unit 16 also includes:
First amplifier 162 is arranged between described three-mixer 160 and the described four-tape bandpass filter 163 output that is used to amplify described three-mixer.
Second amplifier 168 is arranged between described the 5th band pass filter 167 and described second frequency mixer 18 output that is used to amplify described the 5th band pass filter.
The 6th band pass filter 169 is arranged between described second amplifier 168 and described second frequency mixer 18, is used for the output of described second amplifier is carried out filtering so that described second oscillation signals according to be provided.
Herein, described first amplifier 162, described second amplifier 168 and described the 6th band pass filter 169 main purposes also are gain place and the minimizing noise jamming in order to guarantee signal.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (13)

1, a kind of receiver is characterized in that, comprising:
First band pass filter (11) carries out bandpass filtering to received radio wave signal;
The first oscillation signals according generation unit (12) is used to produce first oscillation signals according;
First frequency mixer (13) is used for the output of described first band pass filter and the described first oscillation signals according mixing;
Second band pass filter (14) is used for the output of described first frequency mixer is carried out filtering to export first intermediate-freuqncy signal;
The second oscillation signals according generation unit (16) is used for obtaining frequency shift (FS) from described first intermediate-freuqncy signal, and produces second oscillation signals according according to described frequency shift (FS);
Second frequency mixer (18) is used for described first intermediate-freuqncy signal and the described second oscillation signals according mixing;
The 3rd band pass filter (19) is used for the output of described second frequency mixer is carried out filtering to export second intermediate-freuqncy signal;
Intermediate frequency wave detector (24) is used for described second intermediate-freuqncy signal is carried out detection to obtain the beacon signal intensity information of described second intermediate-freuqncy signal.
2, receiver as claimed in claim 1 is characterized in that, the described second oscillation signals according generation unit comprises:
First local oscillator (161) is used to produce the 3rd oscillation signals according;
Three-mixer (160) is used for described first intermediate-freuqncy signal and described the 3rd oscillation signals according mixing;
Four-tape bandpass filter (163) is used for the output of described three-mixer is carried out filtering to export the 3rd intermediate-freuqncy signal;
Tracking loop circuit (164) is connected with described four-tape bandpass filter, and the frequency that is used to follow the tracks of described the 3rd intermediate-freuqncy signal to be obtaining frequency offset information, and adjusts signal according to the frequency offset information generated frequency;
Second local oscillator (166) is used to produce the 4th oscillation signals according;
The 4th frequency mixer (165) is used for described frequency adjusted signal and the 4th oscillation signals according mixing;
The 5th band pass filter (167) is used for the output of described the 4th frequency mixer is carried out filtering so that described second oscillation signals according to be provided.
3, receiver as claimed in claim 2 is characterized in that, the described second oscillation signals according generation unit also comprises:
First amplifier (162) is arranged between described three-mixer and the described four-tape bandpass filter output that is used to amplify described three-mixer;
Second amplifier (168) is arranged between described the 5th band pass filter and described second frequency mixer output that is used to amplify described the 5th band pass filter.
4, receiver as claimed in claim 3 is characterized in that, the described second oscillation signals according generation unit further comprises:
The 6th band pass filter (169) is arranged between described second amplifier and described second frequency mixer, is used for the output of described second amplifier is carried out filtering so that described second oscillation signals according to be provided.
As each described receiver of claim 1 to 4, it is characterized in that 5, the described first oscillation signals according generation unit comprises frequency synthesizer and the 3rd local oscillator, wherein:
Frequency synthesizer (121) is used for producing frequency signal according to the frequency point information of beacon signal;
The 3rd local oscillator (122) is used for frequency signal to the output of described frequency synthesizer and carries out frequency multiplication and amplify to generate described first oscillation signals according.
6, receiver as claimed in claim 5 is characterized in that, described frequency synthesizer is the DDS Direct Digital Frequency Synthesizers.
7, receiver as claimed in claim 6 is characterized in that, described first local oscillator is the VCO voltage controlled oscillator.
8, receiver as claimed in claim 7 is characterized in that, described receiver also comprises:
The 3rd amplifier (20) is arranged between described the 3rd band pass filter and the described intermediate frequency wave detector output that is used to amplify described the 3rd band pass filter;
Diverter switch (21);
At least two band pass filters that bandwidth is different, the output of described band pass filter is connected with described intermediate frequency wave detector;
The input of described diverter switch is connected with described the 3rd amplifier, and its output optionally is connected to the output of described the 3rd amplifier one of them in the different band pass filter of described at least two bandwidth.
9, receiver as claimed in claim 8 is characterized in that, described receiver also comprises:
The 4th amplifier (15) is arranged between described second band pass filter and described second frequency mixer output that is used to amplify described the secondth band pass filter.
10, receiver as claimed in claim 9 is characterized in that, described receiver further comprises:
The 7th band pass filter (17) is arranged between described the 4th amplifier and described second frequency mixer, is used for filtering is carried out in the output of described first amplifier.
11, receiver as claimed in claim 10 is characterized in that, described receiver also comprises:
Control unit (25) is used for the beacon signal intensity information of described intermediate frequency detection unit output is carried out respective handling.
12, receiver as claimed in claim 11, it is characterized in that described frequency synthesizer is according to the synthetic described frequency signal of eight fractional frequency signals that comes from the frequency point information of described control unit and come from described the 4th oscillation signals according of described second local oscillator.
13, receiver as claimed in claim 12 is characterized in that, described control unit is controlled described diverter switch and optionally the output of described the 3rd amplifier is connected in the different band pass filter of described at least two bandwidth one of them.
CNA2007100283570A 2007-05-31 2007-05-31 A receiver Pending CN101094010A (en)

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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102013897A (en) * 2010-12-06 2011-04-13 电子科技大学 Aim satellite and data receiving circuit for satellite communication receiver
CN102082585A (en) * 2010-12-24 2011-06-01 上海集成电路研发中心有限公司 Wireless sensor network receiver
CN101902622B (en) * 2009-05-26 2012-02-15 上海赛天通信技术有限公司 Satellite beacon receiver
CN102625062A (en) * 2012-03-20 2012-08-01 华为终端有限公司 Transport stream migration equipment and satellite master antenna television system
CN103259990A (en) * 2013-03-21 2013-08-21 宁波森富机电制造有限公司 Four-local-oscillator and single-output Ku-waveband tuner
CN104682875A (en) * 2013-11-27 2015-06-03 中国航空工业集团公司雷华电子技术研究所 Method for effectively restraining generation of spurious broadband signals
CN107329052A (en) * 2017-05-24 2017-11-07 国网辽宁省电力有限公司电力科学研究院 A kind of electric discharge electromagnetic wave time delay value evaluation method based on analog signal
CN108134754A (en) * 2018-01-09 2018-06-08 西安科技大学 A kind of intermediate frequency differential demodulator of gigabit continuous variable rate

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101902622B (en) * 2009-05-26 2012-02-15 上海赛天通信技术有限公司 Satellite beacon receiver
CN102013897A (en) * 2010-12-06 2011-04-13 电子科技大学 Aim satellite and data receiving circuit for satellite communication receiver
CN102082585A (en) * 2010-12-24 2011-06-01 上海集成电路研发中心有限公司 Wireless sensor network receiver
CN102082585B (en) * 2010-12-24 2015-04-29 上海集成电路研发中心有限公司 Wireless sensor network receiver
CN102625062A (en) * 2012-03-20 2012-08-01 华为终端有限公司 Transport stream migration equipment and satellite master antenna television system
CN102625062B (en) * 2012-03-20 2014-10-08 华为终端有限公司 Transport stream migration equipment and satellite master antenna television system
CN103259990A (en) * 2013-03-21 2013-08-21 宁波森富机电制造有限公司 Four-local-oscillator and single-output Ku-waveband tuner
CN103259990B (en) * 2013-03-21 2016-04-06 宁波森富机电制造有限公司 A kind of four local oscillator lists export Ku wave band tuner
CN104682875A (en) * 2013-11-27 2015-06-03 中国航空工业集团公司雷华电子技术研究所 Method for effectively restraining generation of spurious broadband signals
CN107329052A (en) * 2017-05-24 2017-11-07 国网辽宁省电力有限公司电力科学研究院 A kind of electric discharge electromagnetic wave time delay value evaluation method based on analog signal
CN108134754A (en) * 2018-01-09 2018-06-08 西安科技大学 A kind of intermediate frequency differential demodulator of gigabit continuous variable rate

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Open date: 20071226