CN105871409A - Signal receiving and transmitting machine - Google Patents
Signal receiving and transmitting machine Download PDFInfo
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- CN105871409A CN105871409A CN201610294393.0A CN201610294393A CN105871409A CN 105871409 A CN105871409 A CN 105871409A CN 201610294393 A CN201610294393 A CN 201610294393A CN 105871409 A CN105871409 A CN 105871409A
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- doubler
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- 230000010363 phase shift Effects 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 2
- 230000005669 field effect Effects 0.000 description 31
- 238000010586 diagram Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The invention provides a signal receiving and transmitting machine and belongs to the technical field of communication. The signal receiving and transmitting machine at least comprises a local frequency generation module and a frequency source, and the local frequency generation module generates multiple signals of different frequencies according to fixed frequency signals provided by the frequency source. By means of the signal receiving and transmitting machine, the power loss can be reduced.
Description
Technical field
The present invention relates to a kind of transceiver, belong to communication technical field.
Background technology
Frequency mixer and cymoscope in transceiver of the prior art are respectively adopted different frequency sources, so, increase
Cost and power consumption, and integrated level is the highest, volume is bigger.
Summary of the invention
For overcoming technical problem present in prior art, the goal of the invention of the present invention is to provide a kind of transceiver, its
Integrated level is high, volume Miniaturizable, and can reduce power attenuation.
For realizing described goal of the invention, the present invention provides a kind of transceiver, is characterised by, at least includes that local frequency is raw
Module and frequency source, the fixed frequency signal that local frequency generation module provides according to frequency source is become to produce multiple different frequencies
Signal.
Preferably, local generation module at least includes the first doubler, the second doubler, the first phase shifter, the second phase shift
Device, the first multiplier, the second multiplier and first adder, wherein, the first doubler enters for the signal providing frequency source
Row frequency multiplication obtains the first signal；First phase shifter obtained mutually orthogonal with the first signal for the first signal carries out phase shift
Binary signal；Second doubler carries out frequency multiplication for the signal providing frequency source and obtains the 3rd signal；Second phase shifter is for right
3rd signal carries out phase shift and obtains fourth signal mutually orthogonal with the 3rd signal；First multiplier is for the first signal and the
Four signals are multiplied, and are supplied to first adder；Second multiplier is used for being multiplied secondary signal with the 3rd signal,
And it is supplied to first adder；The signal that first multiplier and the second multiplier are provided by first adder carries out additive operation.
Preferably, local frequency generation module at least included for the 3rd phase shifter, and it is for the letter producing first adder
Number carry out phase shift.
Preferably, local frequency generation module at least includes the first frequency divider, and it is for carrying out fixed frequency signal point
Frequently.
Preferably, transceiver also includes agc circuit.
Compared with prior art, the transceiver that the present invention provides, its integrated level is high, volume Miniaturizable, and can reduce
Power attenuation.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of the transceiver that first embodiment of the invention provides；
Fig. 2 is the composition frame chart of the transceiver that second embodiment of the invention provides；
Fig. 3 is the composition frame chart of the transceiver that third embodiment of the invention provides；
Fig. 4 is the composition frame chart of the transceiver that fourth embodiment of the invention provides；
Fig. 5 is the composition frame chart of the frequency source of the transceiver that the present invention provides；
Fig. 6 is the circuit diagram of the voltage controlled oscillator (VCO) of the transceiver that the present invention provides；
Fig. 7 is the circuit diagram of the band filter of the transceiver that the present invention provides；
Fig. 8 is the circuit diagram of the AGC of the transceiver that the present invention provides.
Detailed description of the invention
Fig. 1 is the composition frame chart of the transceiver that first embodiment of the invention provides, as it is shown in figure 1, what the present invention provided
Transceiver includes transmitter unit, local frequency generation units 11, frequency source 10 and antenna 1, and wherein, frequency source 10 is used for producing
Fixed frequency signal；The signal that local frequency generation units 11 produces according to frequency source 1 generates multiple frequency signals, including providing
To the altofrequency carrier signal of manipulator, it is supplied to the high-frequency signal of frequency mixer and is supplied to the intermediate-freuqncy signal of cymoscope；Transmit
Unit, is carried out encoding and modulating on high frequency carrier by data message to be sent for data processor 1, is then changed by antenna
It is dealt in the air for electromagnetic wave.Transmitter unit includes encoder 16, manipulator 15, power amplifier 14 and band filter (BPF)
13, wherein, encoder 16 is for carrying out source and channel coding by data message to be sent for data processor, pending to be formed
The baseband signal sent；Manipulator 15 is for forming modulated signal on modulates baseband signals to be sent to high frequency carrier, and carries
Supply power amplifier 14, power amplifier 14 carries out power amplification and is filtered through band filter 13 modulated signal,
Send through duplexer 16 and antenna 1 after and.
Transceiver also includes receiver unit, and receiver unit includes band filter (BPF) 2, small signal amplifier (AMP)
3, band filter (BPF) 4, multiplying mixer 5, intermediate-frequency filter (MPF) 6, intermediate frequency amplifier (AMP) 7, multiplication cymoscope 8,
Low pass filter (LPF) 9 and decoder 17, wherein, band filter 2 is filtered for the signal of telecommunication receiving reception antenna 1
Ripple；Small signal amplifier 3 is amplified for the signal providing band filter 2, and is supplied to band filter 4 to enter one
The filtering of step；The high-frequency signal that frequency mixer 5 produces with this frequency generation units 11 for the signal providing band filter 4
It is mixed, and takes out intermediate-freuqncy signal through intermediate-frequency filter 6；Intermediate frequency amplifier 7 enters for the signal providing intermediate-frequency filter 6
Row intermediate frequency amplifies, and is supplied to multiplication cymoscope 8；Multiplication cymoscope 8 makes the intermediate-freuqncy signal that local frequency generation units 11 produces
The signal provided with intermediate frequency amplifier 7 is multiplied, and low-pass filtered device 9 takes out baseband signal, and baseband signal is through decoder
17 decodings are taken out the data message sent of making a start and are then supplied to data processor.
Local frequency generation units 11 is for producing the high-frequency signal being supplied to multiplying mixer 5, and it at least includes frequency multiplication
Several doubler 119 for W and the doubler 111 that frequency is H, wherein, doubler 119 is for the signal producing frequency source 10
V0=V0cos 2πf0T carries out W frequency multiplication and obtains signal:
v1=V1cos 2πWf0t；
The doubler 111 v to the signal that doubler 119 produces1=V1cos 2πWf0T carries out H frequency multiplication and obtains signal: v2=
V2cos 2πWHf0T, this signal is supplied to multiplying mixer 5.
Local frequency generation units 11 the most at least includes the phase shifter 118, and its signal producing doubler 119 moves
Phase, obtains v3=V1sin 2πWf0T, is supplied to manipulator as high-frequency carrier signal using this signal.
Local frequency generation units 11 is additionally operable to produce the intermediate-freuqncy signal being supplied to multiplication cymoscope 8, and it at least includes point
Frequency ratio is the frequency divider 112 of R, and frequency divider 112 is in the signal v producing frequency source 100=V0cos 2πf0T carries out R frequency dividing and obtains
It is supplied to the intermediate-freuqncy signal of multiplication cymoscope 8, i.e.
Frequency dividing ratio R in first embodiment of the invention and the numerical value availability data processor of frequency H, W according to
Family sets and controls.
Fig. 2 is the composition frame chart of the transceiver that second embodiment of the invention provides, as in figure 2 it is shown, the present invention second is real
Execute example provide transceiver different from the transceiver that first embodiment provides be only this locality frequency generation units 11
Composition difference.
In second embodiment, ground frequency generation units 11 is supplied to the high-frequency signal of multiplying mixer 5 for producing, and it is extremely
Including the doubler 119 that frequency is W and the doubler 111 that frequency is H less, wherein, doubler 119 is for frequency source 10
The v of the signal produced0=V0cos 2πf0T carries out W frequency multiplication and obtains signal:
v1=V1cos 2πWf0t；
The doubler 111 v to the signal that doubler 119 produces1=V1cos 2πWf0T carries out H frequency multiplication and obtains signal: v2=
V2cos 2πWHf0T, this signal is supplied to multiplying mixer 5.
Local frequency generation units 11 the most at least includes the phase shifter 118, and its signal producing doubler 111 moves
Phase, obtains v3=V2sin 2πWHf0T, is supplied to manipulator as high-frequency carrier signal using this signal.
Local frequency generation units 11 is additionally operable to produce the intermediate-freuqncy signal being supplied to multiplication cymoscope 8, and it at least includes point
Frequency ratio is the frequency divider 112 of R, and frequency divider 112 is in the signal v producing frequency source 100=V0cos 2πf0T carries out R frequency dividing and obtains
It is supplied to the intermediate-freuqncy signal of multiplication cymoscope 8, i.e.
Frequency dividing ratio R in second embodiment of the invention and the numerical value availability data processor of frequency H, W according to
Family sets and controls.
Fig. 3 is the composition frame chart of the transceiver that third embodiment of the invention provides, as it is shown on figure 3, the present invention the 3rd is real
Execute example provide transceiver different from the transceiver that first embodiment provides be only this locality frequency generation units 11
Composition difference.
In 3rd embodiment, local frequency generation units 11 is supplied to the high-frequency signal of multiplying mixer 5 for generation, its
At least include that doubler 135 that frequency is P, phase shifter 120, frequency multiplication are the doubler 134 of W, phase shifter 122, multiplier
113, multiplier 114, adder 125 and have the doubler 111 that frequency is H, doubler 135 is for producing frequency source 10
The v of signal0=V0cos 2πf0T carries out P frequency multiplication and obtains signal:
v1=V1cos 2πPf0t
Phase shifter 120 is to v1=V1cos 2πPf0T phase shift, phase shiftObtain v2=V1sin 2πPf0t。
Doubler 134 is for the signal v producing frequency source 100=V0cos 2πf0T carries out W frequency multiplication and obtains signal: v3=
V3cos 2πWf0t；
Phase shifter 122 is to v3=V3cos 2πWf0T phase shift, phase shiftObtain v4=V3sin 2πWf0t；
Multiplier 113 makes v3=V3cos 2πWf0T and v2=V1sin 2πPf0T is multiplied；Multiplier 114 makes v4=V3sin 2
πWf0T and v1=V1cos 2πPf0T is multiplied, and is added through adder 125, obtains:
V3sin 2πWf0t·V1cos 2πPf0t+V3cos 2πWf0t·V1sin 2πPf0t
=V3V1sin 2π(Wf0+Pf0)t
Then this signal is supplied to doubler 111, obtains through the frequency multiplication of H multiple:
v5=V5sin 2π[H(W+P)·f0] t,
Local frequency generation units 11 is additionally operable to produce the high-frequency carrier signal being supplied to manipulator 15, and it at least includes moving
Phase device 118, the signal producing adder 125 carries out phase shift, obtains v6=V6cos 2π[(W+P)·f0] t, this signal is carried
Supply manipulator is as high-frequency carrier signal
Local frequency generation units 11 is additionally operable to produce the intermediate-freuqncy signal being supplied to multiplication cymoscope 8, and it at least includes point
Frequency ratio is the frequency divider 112 of R, and frequency divider 112 is in the signal v producing frequency source 100=V0cos 2πf0T carries out R frequency dividing and obtains
It is supplied to the intermediate-freuqncy signal of multiplication cymoscope 8, i.e.
Frequency dividing ratio R in third embodiment of the invention and the numerical value availability data processor of frequency H, P, W according to
User sets and controls.
Fig. 4 is the composition frame chart of the transceiver that fourth embodiment of the invention provides；As shown in Figure 4, the present invention the 4th is real
Execute the transceiver of transceiver and the 3rd embodiment offer that example provides different be only that arranging of phase shifter 117 is different.
In 4th embodiment, local frequency generation units 11 is supplied to the high-frequency signal of multiplying mixer 5 for generation, its
At least include that doubler 135 that frequency is P, phase shifter 120, frequency multiplication are the doubler 134 of W, phase shifter 122, multiplier
113, multiplier 114, adder 125 and have the doubler 111 that frequency is H, doubler 135 is for producing frequency source 10
The v of signal0=V0cos 2πf0T carries out P frequency multiplication and obtains signal:
v1=V1cos 2πPf0t
Phase shifter 120 is to v1=V1cos 2πPf0T phase shift, phase shiftObtain v2=V1sin 2πPf0t。
Doubler 134 is for the signal v producing frequency source 100=V0cos 2πf0T carries out W frequency multiplication and obtains signal: v3=
V3cos 2πWf0t；
Phase shifter 122 is to v3=V3cos 2πWf0T phase shift, phase shiftObtain v4=V3sin 2πWf0t；
Multiplier 113 makes v3=V3cos 2πWf0T and v1=V1cos 2πPf0T is multiplied；Multiplier 114 makes v4=V3sin 2
πWf0T and v2=V1sin 2πPf0T is multiplied, and is added through adder 125, obtains:
V3cos 2πWf0t·V1cos 2πPf0t+V3sin 2πWf0t·V1sin 2πPf0t
=V3V1cos 2π(Wf0-Pf0)t
Then this signal is supplied to doubler 111, obtains through the frequency multiplication of H multiple:
v5=V5cos 2π[H(W-P)·f0] t,
Local frequency generation units 11 is additionally operable to produce the high-frequency carrier signal being supplied to manipulator 15, and it at least includes moving
Phase device 118, the signal producing adder 125 carries out phase shift, obtains v6=V6sin 2π[(W-P)·f0] t, this signal is carried
Supply manipulator is as high-frequency carrier signal
Local frequency generation units 11 is additionally operable to produce the intermediate-freuqncy signal being supplied to multiplication cymoscope 8, and it at least includes point
Frequency ratio is the frequency divider 112 of R, and frequency divider 112 is in the signal v producing frequency source 100=V0cos 2πf0T carries out R frequency dividing and obtains
It is supplied to the intermediate-freuqncy signal of multiplication cymoscope 8, i.e.
Frequency dividing ratio R in fourth embodiment of the invention and the numerical value availability data processor of frequency H, P, W according to
User sets and controls.
Although the present invention illustrates the transceiver of above these four form, but is not limited to both forms, as long as
The technical scheme of multiple frequency source is obtained all in scope disclosed by the invention by a frequency source scheme divided, frequency multiplication
In.
Fig. 5 is the composition frame chart of the frequency source of the transceiver that the present invention provides, as it is shown in figure 5, the frequency that the present invention provides
Rate source includes: crystal oscillator 101, respectively than for the frequency divider 102 of K, phase discriminator 103, low pass filter 104, VCO
Device VCO and the respectively ratio frequency divider 106 for N, wherein, crystal oscillator 101 is used for producing fixed frequency signal and is supplied to point
Frequently device 102, frequency divider 102 divides and is supplied to phase discriminator 103 to crystal oscillator 101；VCO is according to reference to Vf and low pass
The voltage that wave filter provides produces VCO signal, and divided device 106 divides the phase discriminator 103 then provided, phase discriminator
The phase place of 103 signals comparing frequency divider 103 and frequency divider 106 offer low-pass filtered device LPF filter high frequency thus produce
Voltage signal, this voltage signal superposes with Vf to control the frequency signal that VCO produces further.
Fig. 6 is the circuit diagram of the voltage controlled oscillator (VCO) of the transceiver that the present invention provides, and as shown in Figure 6, the present invention carries
Voltage controlled oscillator (VCO) voltage controlled oscillator of confession include film body acoustic wave oscillator BAWF1, film body acoustic wave oscillator BAWF2,
Field effect transistor T3, field effect transistor T4, field effect transistor T7, field effect transistor T5, field effect transistor T6, field effect transistor T8 and constant-current source, its
In, the source electrode of field effect transistor T3 is connected to the drain electrode of field effect transistor T4, and the drain and gate of field effect transistor T3 is all connected to power supply EC；
The grid of field effect transistor T7 is connected to the source electrode of field effect transistor T3, and drain electrode is connected to power supply EC, and source electrode is connected to constant-current source；Field effect
The source electrode of pipe T5 is connected to the drain electrode of effect pipe T6, and the drain and gate of field effect transistor T5 is all connected to power supply EC；Field effect transistor T8
Drain electrode is connected to power supply EC, and grid is connected to the source electrode of field effect transistor T5, and source electrode is connected to permanent power supply；The grid T4 of field effect transistor and field
The grid of effect pipe T5 is connected, and is signal input part, and the source electrode of field effect transistor T4 and the source electrode of field effect transistor T6 are that signal is defeated
Go out end.The drain electrode of field effect transistor T4 is connected to first end of film bulk acoustic resonator BAWF1；The drain electrode of field effect transistor T6 is connected to
First end of FBAR BAWF2；Second end of FBAR BAWF1 and FBAR
Second end of BAWF2 is connected, and is voltage controling end.Control voltage Vf to be connected to control end by resistance R10.
Voltage controlled oscillator (VCO) also includes field effect transistor T9, field effect transistor T10, field effect transistor T11 and constant-current source CS, permanent
One end of stream source CS is connected to power supply EC, and the other end is connected to the drain electrode of field effect transistor T11, the source ground of field effect transistor T11,
Grid is connected to its drain electrode, and is connected to the grid of field effect transistor T9 and the grid of field effect transistor T10, the source electrode of field effect transistor T9
Ground connection, drain electrode is connected to the source electrode of field effect transistor T7 to provide constant current to it；The source ground of field effect transistor T10, drain electrode
It is connected to the source electrode of field effect transistor T8 to provide constant current to it.
Fig. 7 is the circuit diagram of the band filter of the transceiver that the present invention provides, as it is shown in fig. 7, what the present invention provided
Band filter includes inductance L, electric capacity C, varactor D1 and resistance R1, and wherein, electric capacity C and varactor D1 is in series
Composition series arm, series arm is in parallel with inductance L, so can form by voltage-controlled band filter, resistance R1's
First end is connected on the intermediate node that electric capacity C and varactor D1 is in series, and second end of resistance R1 connects control voltage.
Fig. 8 is the circuit diagram of the AGC of the transceiver that the present invention provides.As shown in Figure 8, the AGC that the present invention provides controls voltage
Including proportional amplifier, it includes operational amplifier IC, resistance R5, resistance R6, resistance R7, resistance R8 and Zener diode D3, its
In, first end of resistance R7 is connected to the inverting input of operational amplifier IC, and the second end is connected to the low pass filter 9 of cymoscope
Outfan to provide AGC voltage VAGC；Resistance R5 is connected to outfan and the inverting input of operational amplifier IC
Between；Resistance R6 and resistance R8 is in series and is connected between power supply ECC and ground, the intermediate node that resistance R6 and resistance R8 is in series
It is connected to the same item input of operational amplifier, with to operational amplifier IC offer reference voltage:Surely
The negative pole of pressure diode D3 is connected to power supply, and positive pole provides voltage to the power end of operational amplifier IC.
AGC control circuit also includes PNP transistor T1, and its emitter stage is connected to the positive pole of Zener diode, colelctor electrode
Be connected to the outfan of operational amplifier through resistance R4, colelctor electrode is connected to the base stage of transistor T2 through resistance R3.AGC controls electricity
Road also includes NPN transistor T2, its grounded emitter, and colelctor electrode is connected to reference voltage through resistance R9, diode D2 successively
Vf, is simultaneously coupled to second end of the resistance R1 of wave filter.
Reference voltage Vf value in the present invention is controlled according to program by data processor.
Although below combined accompanying drawing to have made to elaborate to according to the object of the invention design and example, but art technology
Personnel are it should be appreciated that on the premise of without departing from present inventive concept, any modifications and variations made based on the present invention are still
So belong to the content in scope.
Although below combined accompanying drawing to have made to elaborate to according to the object of the invention design and example, but art technology
Personnel are it should be appreciated that on the premise of without departing from present inventive concept, any modifications and variations made based on the present invention are still
So belong to the content in scope.
Claims (5)
1. a transceiver, is characterised by, at least includes local frequency generation module and frequency source, local frequency generation module
The fixed frequency signal provided according to frequency source produces the signal of multiple different frequencies.
Transceiver the most according to claim 1, it is characterised in that local generation module at least include the first doubler,
Second doubler, the first phase shifter, the second phase shifter, the first multiplier, the second multiplier and first adder, wherein, first
Doubler carries out frequency multiplication for the signal providing frequency source and obtains the first signal；First phase shifter is for carrying out the first signal
Phase shift obtains the secondary signal mutually orthogonal with the first signal；Second doubler carries out frequency multiplication for the signal providing frequency source
Obtain the 3rd signal；Second phase shifter obtained fourth letter mutually orthogonal with the 3rd signal for the 3rd signal is carried out phase shift
Number；First multiplier is for being multiplied to the first signal and the 4th signal, and is supplied to first adder；Second multiplier is used
In secondary signal is multiplied with the 3rd signal, and it is supplied to first adder；First adder is to the first multiplier and
The signal that paired multiplier provides carries out transceiver additive operation.
Transceiver the most according to claim 2, it is characterised in that local frequency generation module at least includes the 3rd phase shift
Device, it carries out phase shift for the signal producing first adder.
4., according to the transceiver described in Claims 2 or 3, it is characterised in that it is characterized in that, local frequency generation module is extremely
Including the first frequency divider less, it is for dividing fixed frequency signal.
Transceiver the most according to claim 1, it is characterised in that also include agc circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610294393.0A CN105871409B (en) | 2016-04-29 | 2016-04-29 | transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610294393.0A CN105871409B (en) | 2016-04-29 | 2016-04-29 | transceiver |
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| Publication Number | Publication Date |
|---|---|
| CN105871409A true CN105871409A (en) | 2016-08-17 |
| CN105871409B CN105871409B (en) | 2018-12-04 |
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ID=56630503
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610294393.0A Expired - Fee Related CN105871409B (en) | 2016-04-29 | 2016-04-29 | transceiver |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1250985A (en) * | 1998-10-12 | 2000-04-19 | 株式会社东芝 | Radio communication device, and integrated circuit used in such device |
| CN1486538A (en) * | 2001-01-09 | 2004-03-31 | 索尼公司 | Multiband radio signal transmitter/receiver |
| CN1559107A (en) * | 2001-10-03 | 2004-12-29 | 富士通株式会社 | Wireless apparatus capable of communicating in two frequency bands, and local oscillation signal generating method thereof |
| CN105786022A (en) * | 2016-04-14 | 2016-07-20 | 国鹰河北航空科技有限公司 | Unmanned aerial vehicle target tracking system |
-
2016
- 2016-04-29 CN CN201610294393.0A patent/CN105871409B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1250985A (en) * | 1998-10-12 | 2000-04-19 | 株式会社东芝 | Radio communication device, and integrated circuit used in such device |
| CN1486538A (en) * | 2001-01-09 | 2004-03-31 | 索尼公司 | Multiband radio signal transmitter/receiver |
| CN1559107A (en) * | 2001-10-03 | 2004-12-29 | 富士通株式会社 | Wireless apparatus capable of communicating in two frequency bands, and local oscillation signal generating method thereof |
| CN105786022A (en) * | 2016-04-14 | 2016-07-20 | 国鹰河北航空科技有限公司 | Unmanned aerial vehicle target tracking system |
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| Publication number | Publication date |
|---|---|
| CN105871409B (en) | 2018-12-04 |
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