CN104124522A - Miniature four-feed-point measuring antenna device - Google Patents
Miniature four-feed-point measuring antenna device Download PDFInfo
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- CN104124522A CN104124522A CN201410345026.XA CN201410345026A CN104124522A CN 104124522 A CN104124522 A CN 104124522A CN 201410345026 A CN201410345026 A CN 201410345026A CN 104124522 A CN104124522 A CN 104124522A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
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Abstract
The invention discloses a miniature four-feed-point measuring antenna device. The miniature four-feed-point measuring antenna device comprises an upper layer substrate, a lower layer substrate, a diameter restricting plate, coaxial probes and a signal processing circuit, the upper layer substrate is connected with the upper surface of the lower layer substrate, the diameter restricting plate is arranged along the peripheral edges of the lower layer substrate to be connected with the lower layer substrate, the signal processing circuit is mounted below the lower layer substrate, an upper layer patch is disposed on the upper surface of the upper layer substrate, a lower layer patch is disposed on the upper surface of the lower layer substrate, four feed points are designed on the upper layer patch, and each feed point is connected with one end of a coaxial probe. The antenna device is a miniature measuring double-frequency active antenna device with wide band, high gain and good axial ratio performance, and various constellation satellite signals of global positioning system (GPS), global navigational satellite system (GLONASS), big dipper and the like can be simultaneously received. Traditional double-layer microstrip antenna structures are changed, four-feed-point feeding can be achieved, and an antenna is good in antenna phase center stability and positioning accuracy.
Description
Technical field
The present invention relates to a kind of antenna assembly, be specifically related to a kind of antenna assembly of miniaturization four feedback point measurement types.
Background technology
Because satellite navigation can have full-time sky, round-the-clock, high accuracy, the feature of navigation, location and time service is provided continuously in real time, be widely used in the multiple fields such as navigation, mapping, monitoring, time service, communication, therefore in economic development, scientific research, damage control and military field, play a part more and more important, huge to national defense safety and economic construction contribution.With GPS of America ((Global Positioning System, GPS)) for the GPS (Global Position System) of representative (Global Navigation Satellite System, GNSS) application industry progressively becomes a global new high-tech industry.
Along with the extensive use of Satellite Navigation Technique, the antenna performance of the handset apparatus of high-acruracy survey has also been proposed to more and more higher requirement, be mainly manifested in:
(1) good right-handed circular polarization
Gps signal is sent from space by satellite, and in order to eliminate the Faraday rotation effect of ionosphere to signal, what signal adopted is right-handed circular polarization, and therefore, reception antenna also should adopt right-handed circular polarization mode.After gps satellite signal is by symmetric objects reflections such as ground or buildings, can become the cross polarization signal of left-handed polarization, mostly multi-path signal is this form, so right-handed circular polarization antenna can also suppress multipath, disturbs.Because circular polarized antenna exists cross polarization phenomenon, so should manage to improve the cross polarization inhibition ability of antenna.
(2) directivity
The number of satellite that navigation neceiver can receive on ground level is The more the better, and General Requirements can receive all days above aerial satellite-signals of 5 °, the elevation angle.Therefore, antenna will have uniform response to satellite-signal in this space, and when lower than reception height, for suppressing serious multipath effect and tropospheric, antenna response will end rapidly.Desirable GPS receiver antenna has approximate hemispheric directional diagram at poincare half plane, General Requirements lobe width >=120 °, and near cutoff rate horizontal plane is greater than 1dB/ degree (from the elevation angle-5 ° to 5 °).In utilizing the receiver of carrier phase measurement, antenna also should have uniform phase response, and phase center Yao He antenna geometrical center coincide.
(3) active amplification
Navigation antenna has hemispheric directivity, and therefore gain is generally all very low.Antenna element is generally all comprised of reception antenna and low-noise preamplifier, and amplifier generally can provide the gain of 15～35dB, and many navigation antennas directly adopt active antenna design.
(4) interior outside antenna switches
After antenna miniaturization, some degradation.When handset apparatus even cannot be worked in seriously blocking, in strong jamming situation.In order to address this problem, GNSS external antenna has become the indispensable device of many high-side signal receiving equipments, makes built-in, external antenna switching device shifter on handset apparatus, apply more and more extensive.
The current following defect of antenna assembly ubiquity: 1, current, the frequency band of Mini Microstrip paster antenna is narrow, and most of antennas can only receive simple signal, often can only cover the L1 frequency range of GPS, the G1 frequency range of GLONASS, or just receive the signal of the B1 frequency range of the Big Dipper.At present, the reception of many constellations signal is the trend of antenna development, and causing the narrow reason of antenna frequency band is mainly due to antenna unit structure design, the selection of antenna feed point position, and the selection of filter, the design of circuit causes.2, feeding classification, most of antennas adopt the mode feed of SF single feed or double-fed point, and this kind of feeding classification changes the symmetry of antenna structure, makes antenna phase center stable not, and the precision of antenna is not high enough.3, interior external antenna switching circuit is used the transmission of microstrip line coupling, and isolation is low, is subject to ectocine larger.Part commutation circuit adopts software control circuit, operates more loaded down with trivial details.4, built-in antenna receiver the inside, overall aerial signal signal to noise ratio is lower, and reason is that it wire antenna internal circuit noise factor is excessive.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of antenna assembly of miniaturization four feedback point measurement types, make this antenna assembly there is the stable function of broadband, high-gain and phase center, can receive the satellite-signal of a plurality of constellations in addition, can realize and help the receiver function of location fast.
For addressing the above problem, the technical solution adopted in the present invention is as follows:
A kind of antenna assembly of miniaturization four feedback point measurement types, comprise: top substrate layer, lower laminar substrate, suppression diameter plate, coaxial probe and signal processing circuit, described signal processing circuit comprises that the phase-shift circuit, frequency dividing circuit, filter amplification circuit, the alien frequencies that are electrically connected successively close road circuit, second amplifying circuit and gain control circuit, described top substrate layer, lower laminar substrate, suppression diameter plate and signal processing circuit arrange successively from top to bottom, the upper surface of described top substrate layer is provided with upper strata paster, the upper surface of lower laminar substrate is provided with lower floor's paster, described upper strata paster is provided with four feedback points, each feedback point is connected with one end of a described coaxial probe respectively, the other end of four described coaxial probes is all successively through top substrate layer, lower floor's paster and lower laminar substrate are also electrically connected with phase-shift circuit, described suppression diameter plate be provided with one for signal that signal processing circuit is exported by the built-in interface of cable transmission to signal receiver, described built-in interface and gain control circuit are electrically connected.
Four described feedback points are uniformly distributed on a circumference, the center of circle of this circumference overlaps with the mid point of upper strata paster, respectively four coaxial probes are designated as to the first coaxial probe, the second coaxial probe, the 3rd coaxial probe and the 4th coaxial probe, phase-shift circuit comprises the first electric bridge, the second electric bridge and the 3rd electric bridge, the first coaxial probe and the second coaxial probe are all electrically connected with the first electric bridge, the 3rd coaxial probe and the 4th coaxial probe are all electrically connected with the second electric bridge, the first electric bridge and the second electric bridge are all electrically connected with the 3rd electric bridge, the 3rd electric bridge and frequency dividing circuit are electrically connected,
Described filter amplification circuit comprises the first filter amplification circuit and the second filter amplification circuit, described the first filter amplification circuit comprises the first prefilter, the first amplifier and the first postfilter being electrically connected successively, the second filter amplification circuit comprises and is electrically connected successively the second prefilter, the second amplifier and the second postfilter, the first prefilter and the second prefilter are electrically connected with frequency dividing circuit respectively, and the first postfilter and the second postfilter close road circuit with alien frequencies respectively and be electrically connected.
Described suppression diameter plate is provided with an external antenna interface for being connected with exterior antenna device, described signal processing circuit also comprises the commutation circuit for the switching of built-in aerial and external antenna, described commutation circuit comprises mixer and current detection control circuit, described external antenna interface and current detection control circuit are electrically connected, described gain control circuit and current detection control circuit are electrically connected with the input of mixer respectively, the output of mixer and built-in interface are electrically connected, described current detection control circuit is for cutting off when external antenna interface has electric current in mixer and being connected of gain control circuit when detecting.
Described top substrate layer is connected in the upper surface of lower laminar substrate and is positioned at the projection of lower laminar substrate, and described suppression diameter plate arranges and is connected with lower laminar substrate along lower laminar substrate periphery.
The periphery of described upper strata paster is provided with for regulating frequency position with the tuning tooth piece of compensating frequency deviation.
Described tuning tooth piece has four, and four tuning tooth pieces are uniformly distributed along the periphery of upper strata paster.
Point midway at described upper strata paster is provided with a grounding probe through top substrate layer, lower floor's paster and lower laminar substrate.
Described suppression diameter plate is provided with a plurality of for strengthening the suppression diameter hole to the inhibition ability of multi-path signal.
Described suppression diameter plate is provided with a plurality of for by the hard-wired installing hole of antenna assembly.
Compared to existing technology, beneficial effect of the present invention is: this antenna assembly is a kind of device with miniaturization, broadband, high-gain, good axial ratio performance measurement type dual frequency active antenna, can receive many constellations satellite-signals such as GPS, GLONASS, the Big Dipper simultaneously.Change traditional Two--Layer Microstrip Antenna structure, realize four feedback point feeds, make antenna there is good antenna phase center stability and positioning precision.Used the amplifier with ultra-low noise, made the noise factor of integrated circuit lower, antenna assembly has higher signal-to-noise performance.By adopting the design of current detection control circuit and mixer to realize the switching of interior external antenna, simple to operate, isolation is high, the impact that built-in signal is not gone between.
Accompanying drawing explanation
Fig. 1 is the structure vertical view of the antenna assembly of miniaturization four feedback point measurement types of the present invention.
Fig. 2 is the A-A sectional view in Fig. 1 of the present invention.
Fig. 3 is the circuit diagram of the antenna assembly of miniaturization four feedback point measurement types of the present invention.
Wherein: 1, top substrate layer; 2, lower laminar substrate; 3, suppression diameter plate; 4, upper strata paster; 5, lower floor's paster; 6, built-in interface; 7, external antenna interface; 11, the first coaxial probe; 12, the second coaxial probe; 13, the 3rd coaxial probe; 14, the 4th coaxial probe; 21, tuning tooth piece; 22, grounding probe; 23, suppression diameter hole; 24, installing hole; 101, the first electric bridge; 102, the second electric bridge; 103, the 3rd electric bridge; 104, frequency dividing circuit; 105, alien frequencies closes road circuit; 106, amplifier; 107, gain control circuit; 108, mixer; 109, current detection control circuit; 201, the first prefilter; 202, the first amplifier; 203, the first postfilter; 204, the second prefilter; 205, the second amplifier; 206, the second postfilter.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the present invention is described further:
Fig. 1-3 show the preferred embodiments of the present invention, a kind of antenna assembly of miniaturization four feedback point measurement types, comprise: top substrate layer 1, lower laminar substrate 2, suppression diameter plate 3, coaxial probe and signal processing circuit, top substrate layer 1 is connected in the upper surface of lower laminar substrate 2, the surface area of lower laminar substrate 2 is greater than the surface area of top substrate layer 1 and the mid point of top substrate layer 1 overlaps with the mid point of lower laminar substrate 2, suppression diameter plate 3 is along lower laminar substrate 2 periphery settings and be connected with lower laminar substrate 2, signal processing circuit is located on a circuit board, and this circuit board is located at the below of lower laminar substrate 2.Top substrate layer 1 and lower laminar substrate 2 are selected the frequency microwave sheet material of high-k, low tangent loss angle, and this microwave sheet material can make antenna miniaturization, make to be applicable to the more and more handheld receiver equipment of miniaturization.
The upper surface of top substrate layer 1 is provided with upper strata paster 4, the upper surface of lower laminar substrate 2 is provided with lower floor's paster 5, the periphery of top substrate layer 1 is provided with metal hemming edge, upper strata paster 4 and lower floor's paster 5 are electrically conducted, lower laminar substrate 2 and lower floor's paster 5 the frequency bandwidth that can expand this antenna assembly is set, and then can receive many constellations satellite-signals such as GPS, GLONASS, the Big Dipper simultaneously.
Coaxial probe has four, be designated as respectively the first coaxial probe 11, the second coaxial probe 12, the 3rd coaxial probe 13 and the 4th coaxial probe 14, mid point round upper strata paster 4 is provided with four feedback points on upper strata paster 4, four feedback points are uniformly distributed on a circumference, the mid point of circumference overlaps with the mid point of upper strata paster 4, four feedback points are connected to form a square, along four feedback point positions, in top substrate layer 1 and lower laminar substrate 2, have plated-through hole vertically downward respectively, four coaxial probes are respectively through four plated-through holes, one end of four coaxial probes is connected with four feedback points on upper strata paster 4 respectively.The position of four feedback points has good symmetry, can make the phase center of antenna assembly and the geometric center of its structure overlap, and then improve Phase center stability and the positioning precision of antenna assembly, and this is different from traditional antenna structure.The position of four feedback points can produce double frequency satellite-signal, this satellite-signal has high-gain, good axial ratio performance, the feature of circular polarization radiation, wherein the first coaxial probe 11 and the second coaxial probe 12 transmit a kind of satellite-signal of frequency, the satellite-signal of the 3rd coaxial probe 13 and the another kind of frequency of the 4th coaxial probe 14 transmission.
Suppression diameter plate 3 is provided with built-in interface 6, signal processing circuit comprises the phase-shift circuit being electrically connected successively, frequency dividing circuit 104, filter amplification circuit, alien frequencies closes road circuit 105, second amplifying circuit and gain control circuit 107, wherein phase-shift circuit comprises the first electric bridge 101, the second electric bridge 102 and the 3rd electric bridge 103, filter amplification circuit comprises the first filter amplification circuit and the second filter amplification circuit, the first filter amplification circuit comprises the first prefilter 201 being electrically connected successively, the first amplifier 202 and the first postfilter 203, the second filter amplification circuit comprises and is electrically connected successively the second prefilter 204, the second amplifier 205 and the second postfilter 206, second amplifying circuit comprises amplifier 106.The first amplifier 202 and the second amplifier 205 are the amplifier of ultra-low noise, the signal to noise ratio of most antenna assembly is too low, because circuit inner noise coefficient is excessive, the noise factor that reduces circuit is conducive to improve the whole signal to noise ratio of antenna, so the amplifying circuit of ultra-low noise reduces the noise factor in circuit greatly.
The satellite-signal that the first coaxial probe 11 and the second coaxial probe 12 transmit is designated as L1, the satellite-signal that the 3rd coaxial probe 13 and the 4th coaxial probe 14 transmit is designated as L2, satellite-signal L1 inputs to the first electric bridge 101 and carries out phase shift, satellite-signal L2 inputs to the second electric bridge 102 and carries out phase shift, through the signal of the first electric bridge 101 and the second electric bridge 102, transfer to the 3rd electric bridge 103 and carry out phase shift, three electric bridges all can carry out 90 degree phase difference phase shifts, and above-mentioned adjacent feedback point signal has 90 degree phase differences, so signal phase preserving after the phase shift of three electric bridges is consistent.From the signal of the 3rd electric bridge 103 outputs, through frequency dividing circuit 104, signal is divided into signal A1 and signal A2, signal A1 carries out filtering through the first prefilter 201 successively, the first amplifier 202 amplifies and the first postfilter 203 carries out filtering again, then transfer to alien frequencies and close road circuit 105, signal A2 carries out filtering through the second prefilter 204 successively, the second amplifier 205 amplifies and the second postfilter 206 carries out filtering again, then transfer to alien frequencies and close road circuit 105, alien frequencies closes road circuit 105 and A1 and A2 two paths of signals are combined into a road signal export amplifier 106 to, through amplifier 106 amplifying signals, input to gain control circuit 107 signal gain is adjusted to the required gain size of signal receiver, the signal of adjusting through gain control circuit 107 transfers in a signal receiver by built-in interface 6.
Further, on suppression diameter plate 3, be also provided with external antenna interface 7, between gain control circuit 107 and built-in interface 6, increase by a commutation circuit, commutation circuit comprises mixer 108 and current detection control circuit 109, gain control circuit 107 and current detection control circuit 109 are electrically connected with the input of mixer 108 respectively, the output of mixer 108 and built-in interface 6 are electrically connected, and external antenna interface 7 is electrically connected with current detection control circuit 109.After external antenna interface 7 is connected with external antenna device, current detection control circuit 109 just can detect external antenna interface 7 electric current, then cut off in mixer 108 and being connected of gain control circuit 107, cut off the electric current of antenna assembly of the present invention, thereby use external antenna device to pass through built-in interface 6 to signal receiver output signal, realize the switching of external antenna device.
Further, the periphery of upper strata paster 4 is provided with tuning tooth piece 21, and tuning tooth piece 21 has four, and four tuning tooth pieces 21 are uniformly distributed along the periphery of upper strata paster 4, and tuning tooth piece 21 is for regulating frequency position with compensating frequency deviation.
Further, at the point midway of upper strata paster 4, be provided with a grounding probe 22 through top substrate layer 1, lower floor's paster 5 and lower laminar substrate 2, grounding probe 22 is for extended antenna device bandwidth and increase the stability of antenna assembly.
Further, suppression diameter plate 3 is provided with a plurality of for strengthening the suppression diameter hole 23 to the inhibition ability of multi-path signal, is also provided with four for by the hard-wired installing hole 24 of antenna assembly on suppression diameter plate 3.
To one skilled in the art, can make other various corresponding changes and deformation according to technical scheme described above and design, and within these all changes and deformation all should belong to the protection range of the claims in the present invention.
Claims (9)
1. the antenna assembly of a miniaturization four feedback point measurement types, it is characterized in that, comprise: top substrate layer, lower laminar substrate, suppression diameter plate, coaxial probe and signal processing circuit, described signal processing circuit comprises that the phase-shift circuit, frequency dividing circuit, filter amplification circuit, the alien frequencies that are electrically connected successively close road circuit, second amplifying circuit and gain control circuit, described top substrate layer, lower laminar substrate, suppression diameter plate and signal processing circuit arrange successively from top to bottom, the upper surface of described top substrate layer is provided with upper strata paster, the upper surface of lower laminar substrate is provided with lower floor's paster, described upper strata paster is provided with four feedback points, each feedback point is connected with one end of a described coaxial probe respectively, the other end of four described coaxial probes is all successively through top substrate layer, lower floor's paster and lower laminar substrate are also electrically connected with phase-shift circuit, described suppression diameter plate be provided with one for signal that signal processing circuit is exported by the built-in interface of cable transmission to signal receiver, described built-in interface and gain control circuit are electrically connected.
2. the antenna assembly of point measurement types is presented in miniaturization four according to claim 1, it is characterized in that, four described feedback points are uniformly distributed on a circumference, the center of circle of this circumference overlaps with the mid point of upper strata paster, respectively four coaxial probes are designated as to the first coaxial probe, the second coaxial probe, the 3rd coaxial probe and the 4th coaxial probe, phase-shift circuit comprises the first electric bridge, the second electric bridge and the 3rd electric bridge, the first coaxial probe and the second coaxial probe are all electrically connected with the first electric bridge, the 3rd coaxial probe and the 4th coaxial probe are all electrically connected with the second electric bridge, the first electric bridge and the second electric bridge are all electrically connected with the 3rd electric bridge, the 3rd electric bridge and frequency dividing circuit are electrically connected,
Described filter amplification circuit comprises the first filter amplification circuit and the second filter amplification circuit, described the first filter amplification circuit comprises the first prefilter, the first amplifier and the first postfilter being electrically connected successively, the second filter amplification circuit comprises and is electrically connected successively the second prefilter, the second amplifier and the second postfilter, the first prefilter and the second prefilter are electrically connected with frequency dividing circuit respectively, and the first postfilter and the second postfilter close road circuit with alien frequencies respectively and be electrically connected.
3. the antenna assembly of point measurement types is presented in miniaturization four according to claim 1 and 2, it is characterized in that, described suppression diameter plate is provided with an external antenna interface for being connected with exterior antenna device, described signal processing circuit also comprises the commutation circuit for the switching of built-in aerial and external antenna, described commutation circuit comprises mixer and current detection control circuit, described external antenna interface and current detection control circuit are electrically connected, described gain control circuit and current detection control circuit are electrically connected with the input of mixer respectively, the output of mixer and built-in interface are electrically connected, described current detection control circuit is for cutting off when external antenna interface has electric current in mixer and being connected of gain control circuit when detecting.
4. the antenna assembly of point measurement types is presented in miniaturization four according to claim 1, it is characterized in that, described top substrate layer is connected in the upper surface of lower laminar substrate and is positioned at the projection of lower laminar substrate, and described suppression diameter plate arranges and is connected with lower laminar substrate along lower laminar substrate periphery.
5. the antenna assembly of miniaturization four feedback point measurement types according to claim 1, is characterized in that, the periphery of described upper strata paster is provided with for regulating frequency position with the tuning tooth piece of compensating frequency deviation.
6. the antenna assembly of miniaturization according to claim 5 four feedback point measurement types, is characterized in that, described tuning tooth piece has four, and four tuning tooth pieces are uniformly distributed along the periphery of upper strata paster.
7. the antenna assembly of miniaturization according to claim 1 four feedback point measurement types, is characterized in that, at the point midway of described upper strata paster, is provided with a grounding probe through top substrate layer, lower floor's paster and lower laminar substrate.
8. the antenna assembly of miniaturization four feedback point measurement types according to claim 1, is characterized in that, described suppression diameter plate is provided with a plurality of for strengthening the suppression diameter hole to the inhibition ability of multi-path signal.
9. the antenna assembly of miniaturization according to claim 1 four feedback point measurement types, is characterized in that, described suppression diameter plate is provided with a plurality of for by the hard-wired installing hole of antenna assembly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410345026.XA CN104124522B (en) | 2014-07-18 | 2014-07-18 | A kind of four feed point measurement type antenna assemblies of miniaturization |
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| CN201410345026.XA CN104124522B (en) | 2014-07-18 | 2014-07-18 | A kind of four feed point measurement type antenna assemblies of miniaturization |
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| CN104124522A true CN104124522A (en) | 2014-10-29 |
| CN104124522B CN104124522B (en) | 2017-03-29 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104882661A (en) * | 2015-06-01 | 2015-09-02 | 蒋振东 | Wide-beam circularly-polarized micro-strip antenna |
| CN105161836A (en) * | 2015-08-20 | 2015-12-16 | 广州中海达卫星导航技术股份有限公司 | Measurement-type antenna device |
| CN107004958A (en) * | 2014-11-03 | 2017-08-01 | 阿莫技术有限公司 | Wideband patch antenna module |
| CN108110437A (en) * | 2017-12-18 | 2018-06-01 | 东莞市合康电子有限公司 | Minimize tunable GPS antenna device and its production technology |
| CN109462034A (en) * | 2018-10-12 | 2019-03-12 | 江苏三和欣创通信科技有限公司 | A kind of more star multifrequency measurement type antennas of external |
| CN109586744A (en) * | 2018-11-23 | 2019-04-05 | 天津七六四通信导航技术有限公司 | A kind of waterproof energy-saving type VOCA voice communications assembly |
| CN109976380A (en) * | 2019-03-29 | 2019-07-05 | 北京理工大学 | Isolation identification bearing calibration and system based on Kalman Filter Estimation |
| CN110289481A (en) * | 2019-05-29 | 2019-09-27 | 南京理工大学 | Vehicle-mounted Dual Spectral Radiation differentiation paster antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107004958A (en) * | 2014-11-03 | 2017-08-01 | 阿莫技术有限公司 | Wideband patch antenna module |
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| CN105161836A (en) * | 2015-08-20 | 2015-12-16 | 广州中海达卫星导航技术股份有限公司 | Measurement-type antenna device |
| CN108110437A (en) * | 2017-12-18 | 2018-06-01 | 东莞市合康电子有限公司 | Minimize tunable GPS antenna device and its production technology |
| CN109462034A (en) * | 2018-10-12 | 2019-03-12 | 江苏三和欣创通信科技有限公司 | A kind of more star multifrequency measurement type antennas of external |
| CN109586744A (en) * | 2018-11-23 | 2019-04-05 | 天津七六四通信导航技术有限公司 | A kind of waterproof energy-saving type VOCA voice communications assembly |
| CN109976380A (en) * | 2019-03-29 | 2019-07-05 | 北京理工大学 | Isolation identification bearing calibration and system based on Kalman Filter Estimation |
| CN110289481A (en) * | 2019-05-29 | 2019-09-27 | 南京理工大学 | Vehicle-mounted Dual Spectral Radiation differentiation paster antenna |
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| CN104124522B (en) | 2017-03-29 |
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