CN104966887A - High-anti-multipath high-precision measuring type antenna and communication equipment - Google Patents
High-anti-multipath high-precision measuring type antenna and communication equipment Download PDFInfo
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Abstract
The invention relates to a high-anti-multipath high-precision measuring type antenna and communication equipment. The antenna comprises a central radiation unit assembly, a support assembly, a ground plate assembly, a half-opening round chamber assembly, a polarized isolation power dividing device and a wave-transmitting sealing antenna housing. The central radiation unit assembly is fixed on the top of the support assembly. The support assembly is fixed on the center of the ground plate assembly. The half-opening round chamber assembly is coaxially arranged in a way to abut on the back side of the ground plate assembly. The polarized isolation power dividing device is arranged on the back side central part of the ground plate assembly. The central radiation unit assembly is connected with the polarized isolation power dividing device through a coaxial supply line arranged inside the support assembly. The antenna is fully sealed inside the wave-transmitting sealing antenna housing. The antenna which achieves multi-frequency, broadband and stable radiation phase center characteristics further achieves a full-space single lobe pattern and has the advantages of high circular symmetry, high roll-off, high front-to-back ratio, and good wide angle circular polarization characteristics. Furthermore, the antenna has the characteristics of super strong anti-multipath performance, small size, lightness, high reliability, low cost, etc.
Description
Technical field
The present invention relates to communication technical field, particularly relate at the high-acruracy survey type reception antenna of a kind of high anti-multipath of satellite navigation terminal and communication equipment.
Background technology
Navigation satellite transmits and comprises carrier wave, ranging code and numeric data code, is often called navigation message.Navigation message is carried out the 7 dimension information that information processing is converted to Position, Velocity and Time by receiver, completes navigation, locates and provide time reference.In the application of high-precision GNSS, location survey precision to be brought up to centimetre and sub-centimetres, and its antenna is the indispensable key equipment of this receiver, plays a part very crucial to the carrier phase measurement precision improving GNSS.
Early stage at GPS, GPS-L1 receiver antenna many employings microband paste of single-frequency pseudorange code location and four-arm spiral antenna.Along with double-frequency GPS differential applications, occurred double-deck micro-strip paster antenna, this kind of antenna solves the application of GPS-L1 and GPS-L2 dual-frequency point by the stacked of micro-band dielectric-slab, but can not meet multiple frequency broad band application requirement completely.There is microstrip antenna radiation can produce surface wave again, because the excitation of surface wave and radiation make the front and back of microstrip antenna antenna pattern ratio, circular symmetry and wide-angle circular polarization characteristics all be difficult to improve and improve simultaneously.The ability of this kind of antenna anti-multipath is poor, is difficult to meet High-precision carrier and measures requirement.Afterwards, be the Circular microstrip patch antenna suppressing surface wave to propose two short circuit annulus, obtain obvious effect at GPS-L1, L2.This design does not depart from resonance concept, is applied to multifrequency, still has any problem in broadband.The satellite-based resource of current diversification, in the face of many stars and deposit, share applied environment and high-acruracy survey require application, microstrip antenna seems deficiency more.
Multipath refers to that a navigation satellite signal arrives the phenomenon of receiver by multiple path.Arriving receiver signal can as being a direct signal and many superpositions through indirect signals such as reflection, diffraction.Multipath signal directly causes receiver pseudo-range measurements or carrier-phase measurement deviation, causes positioning precision and position stability to decline.Multipath error is one of main error source of GNSS receiver location.Multi-path jamming has become the difficult problem improving receiver positioning precision, stability and reliability further and must break through.The process of GNSS receiver multipath signal is roughly divided into spatial domain and time domain two class.Receiver Time Domain Processing mainly suppresses the impact of multipath signal, conventional has narrow correlation method, waveform decomposition method, iteratively faster maximum likelihood algorithm (FIMLA), and multipath estimated delay is phase-locked around-France etc., this needs to occupy more resource, makes receiver device complex redundancy.This is against the miniaturization of receiver, lightweight, attenuating power consumption, the target that reduces costs, and the time delay that antenna peripheral reflection etc. causes is less than to the situation of 1/15 chip lengths, and receiver still can not effectively process.In order to improve the ability of receiver system anti-multipath, applying maximum at present for receiver single antenna is then add chokes ring (Choke-Ring) form: utilize choke surface impedance to present high-impedance behavior to suppress surface wave.The introducing of choke considerably increases the size of element antenna, weight, and the increase of cost is also inevitable.And the design of chokes ring presents high impedance based on collar extension to suppress stray radiation.This mechanism of action is relevant with frequency, will expand frequency band further, or its realization of raising rejection ability is also inconvenient further.
Summary of the invention
Technical problem to be solved by this invention is for the deficiencies in the prior art, suppress multipath by the half opening cylindrical cavity of the Pattern Synthesis of space filtering and the band slot that changes shape, provide that a kind of body is little, the high-acruracy survey type antenna of the high anti-multipath of light weight, low cost and communication equipment.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of high-acruracy survey type antenna of high anti-multipath, comprises central radiating element assembly, supporting component, ground plate assembly, half opening cylindrical cavity assembly, polarization isolation merit separating device and wave transparent encapsulated antenna cover;
Described central radiating element assembly is fixed on the top of supporting component, described supporting component is fixed on ground plate assembly central authorities, described half opening cylindrical cavity assembly is coaxially installed near ground plate module backside, described polarization isolation merit separating device is installed on the center, the back side of described ground plate assembly, described central radiating element assembly is connected with polarization isolation merit separating device through the coaxial inner conductor that supporting component is built-in, and antenna is sealed in wave transparent encapsulated antenna cover completely.
The invention has the beneficial effects as follows: the present invention has complete centrosymmetric structure, at central radiating element assembly, multifrequency is realized under the half opening cylindrical cavity acting in conjunction of ground plate assembly and band slot, broadband and stable radiating phase central characteristics, by ground plate assembly and the space filtering realizing directional diagram figuration under being with the effect of the half opening cylindrical cavity of slot, the heart-shaped seemingly directional diagram without back lobe can be formed, effectively improve multipaths restraint usefulness, 4 circular polarization feeds are realized by four support bar feeds and polarization isolation merit separating device, isolation cross polar component, described antenna also has small-sized, light weight, highly reliable, the characteristics such as low cost.Antenna of the present invention and high-acruracy survey type compatible receiver adapted can realize the positioning precision of the real-time dynamic monitoring of cm or mm magnitude, are one of important core equipment of high-end receiver and CORS base station.
On the basis of technique scheme, the present invention can also do following improvement.
Further, centered by described central radiating element assembly, circle symmetrical structure, comprises four obtuse-angulate covering of the fan oscillators of bending, four described covering of the fan oscillator pairwise orthogonals, forms right-angled intersection radiating element.
The beneficial effect of above-mentioned further scheme is adopted to be: inventive antenna central radiating element is made up of 4 orthogonal broadband covering of the fan oscillators, belong to short, short antenna, complete centrosymmetric structure, there is the stable radiation phase heart, the accessory terminal short-circuit coaxial line utilizing two support bars to be formed adds upper end capacitance compensation, by the design of exclusive widening frequency band and condensance compensation technique, not only realize the feed balun of 0 °/180 °, and achieve the Broadband Matching of antenna feed.In 1.1-1.7MHz band, port standing-wave ratio VSWR≤1.2, meet the shared multifrequency of many stars, multimode application requirement completely.
Further, described supporting component comprises four support bars, between two support bar Orthogonally arrangement, and each fan-shaped vibrator of described central radiating element assembly is installed on four support bar top respectively, and four described covering of the fan oscillators keep phase co-altitude with ground plate assembly.
Further, the coaxial inner conductor of two in four support bars of described supporting component adjacent built-in band matching sections of support bar, one end of described coaxial inner conductor is connected on offside support bar heart yearn, and the other end is connected with the input of polarization isolation merit separating device; Two other support bar forms the auxiliary allotment coaxial line of bottom short circuit simultaneously, the auxiliary allotment coaxial line of described bottom short circuit makes offside support bar coaxial inner conductor and covering of the fan oscillator keep microwave joining by the distributed capacitance that top is formed, form the balanced feeding balun of 0 °/180 °, and form impedance allotting network with offside support bar containing the coaxial line of matching section.
The beneficial effect of above-mentioned further scheme is adopted to be: in supporting component, two support bars are double does RF feeding coaxial lines, two other support bar forms the auxiliary allotment coaxial line of bottom short circuit, built-in matching section acting in conjunction with feeding coaxial lines, then can realize the coupling to 50 Ω coaxial lines without the need to additional network; Feeding network of the present invention is made up of the feed ' Balun ' of coaxial 0 °/180 ° and 3dB/90 ° of polarization isolation merit separating device, form exclusive circular polarization feeder equipment, not only realize forming 4 circular polarization feeds to radiation center unit, can also isolate cross polarization (LHCP) component, its main component is reflection multipath signal.The exclusive feature of this feeder equipment is compact conformation, and integrated level is high, and feed RF loss is low, and easily and antenna and receiver integrated.
Further, described central radiating element assembly top is by the coaxial installation of dielectric ring circular metal plate as director.
Adopt the beneficial effect of above-mentioned further scheme: the metal plate as director works to directional diagram figuration and impedance matching.
Further, described ground plate assembly is that upper surface is dull and stereotyped with the circular metal of multiple symmetrical Radial Coupling plate, and Radial Coupling plate forms cut-off planar waveguide between two, stops surface wave transmission.
The beneficial effect of above-mentioned further scheme is adopted to be: described ground plate assembly completes the space filtering of directional diagram figuration, vital effect is served to raising multipaths restraint usefulness, the waveguide that described ground plate is formed is in cutoff modes state for the TE mould (surface wave) along ground plate radial transport, multiple radial flat board makes surface wave (TE mould) be attenuated in transmitting procedure, stray radiation is prevented to disturb, inventive antenna anti-multipath mechanism and chokes ring different, without the need to increasing antenna aperture size, its usefulness and frequency band are better than chokes loop antenna, this antenna structure is lighter and handier, compacter, more low cost, also there is more excellent anti-multipath usefulness, wider frequency bandwidth characteristics.
Further, described half opening cylindrical cavity assembly is the half opening annulus of multiple coaxial layer stacked strips 90 ° of bendings, with ground plate assembly combine install time, form the half opening cylindrical cavity of centre short circuit, cylindrical cavity opening upwards, form high impedance, stop stray electrical current and radiation thereof with sequential the acting on of ground plate assembly.
Further, on the chamber wall of described half opening cylindrical cavity, form equally spaced one group of radial slot from openend, stop remaining stray electrical current to form circular current at chamber wall, quantity and the size of the dark and slot in described cylindrical cavity radius and chamber adjust as required, directly cause stray electrical current radiation completely suppressed.
Adopt the beneficial effect of above-mentioned further scheme to be: the half opening annulus of described band slot with ground plate assembly combine install time, centre forms short circuit, and cylindrical cavity opening upwards forms high impedance, stops stray electrical current; Existing chokes loop device is all from the a-circle-by-a-circle extension in the edge of ground plate, and retaining ring is deeply near λ/4, make entire physical volume larger, the present invention adopts bending to design from centre near bottom ground plate, the size of the half opening cylindrical cavity of band slot is reduced greatly, the present invention is by adjustment half-open oral cavity radius with chamber is dark and the slot number of the half opening cylindrical cavity of band slot and length in addition, effectively can suppress the generation of residual surface ripple circular current, the back lobe that remaining circular current is formed can be suppressed completely, form likeness in form
normalized radiation pattern, wherein n carries out adjusting and selecting according to pattern requirements, the mechanism of this sequential suppression stray radiation can make inventive antenna achieve the single lobe of the total space, without other, back lobe, and the navigation terminal receiver ideal orientation figure of the total space single main polarization (RHCP).Above-mentioned technical characteristic his-and-hers watches ground roll and stray electrical current define sequential suppression, form high anti-multipath usefulness.
Further, described polarization isolation merit separating device comprises two input ports and two output ports, and two input ports are connected with the coaxial inner conductor of supporting component, in output port respectively, the one end exporting RHCP signal is connected with receiver, and another output port is connected with absorption resistance.
The beneficial effect of above-mentioned further scheme is adopted to be: the LHCP signal absorption that described absorption resistance will be drawn thus, the power division network that described polarization isolation merit separating device is formed is different from general 3dB power splitter, it not only realizes outside power division and 90 ° of phase shifts, can also absorb orthogonally polarized component LHCP, absorb reflection and derotation component, stop the interference to receiver direct signal.
A kind of communication equipment, comprises the high-acruracy survey type antenna of the high anti-multipath described in technique scheme.Described communication equipment can be the communication equipment such as receiver or base station.
Accompanying drawing explanation
Fig. 1 is the cutaway view of the high-acruracy survey type antenna of a kind of high anti-multipath of the present invention;
Fig. 2 is ground plate assembly plan view of the present invention;
Fig. 3 is the AA cutaway view of Fig. 2;
Fig. 4 is the vertical view in two half opening annulus chambeies stacked of the present invention;
Fig. 5 is the AA cutaway view of Fig. 4.
In accompanying drawing, the list of parts representated by each label is as follows:
1, central radiating element assembly, 2, supporting component, 3, ground plate assembly, 4, half opening cylindrical cavity assembly, 5, polarization isolation merit separating device, 6, wave transparent encapsulated antenna cover, 7, cable tail.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Antenna of the present invention can be used for High-precision carrier phase measurement type GNSS terminal receiver system, also can be used as any need formed broadband, circular polarization, hemispheric beam, has the antenna of stable phase heart requirement.
Navigation positioning receiver is the basis of all application in satellite navigation industry, and receiver antenna is the important and nucleus equipment of receiver.Popularizing and going deep into along with application, more and more higher to the requirement of receiver system accuracy, a kind of carrier phase measurement type receiver can realize the positioning precision of cm and even mm magnitude, and corresponding antenna requirement also general antenna cannot meet.Inventive antenna can directly apply to new antenna (abbreviation antenna) or the network RTK antenna for base station of this high-acruracy survey type GNSS user compatible receiver, and the radio receiving system that simultaneously also can be similar requirement provides antenna support etc.
The present invention consider GNSS entirely navigate spectral coverage application, be focussed in particular on China BD-2 systematic difference.Antenna of the present invention not only meets High-precision carrier phase measurement type GNSS compatible receiver antenna requirement completely, there is the single hemispheric beam of the total space, back lobe without issue, beyond challenge anti-multipath jamming ability, have the speciality such as body is little, light weight, low cost.
As shown in Figure 1, a kind of high-acruracy survey type antenna of high anti-multipath, comprises central radiating element assembly 1, supporting component 2, ground plate assembly 3, half opening cylindrical cavity assembly 4 and polarization isolation merit separating device 5; Described central radiating element assembly 1 is fixed on the top of supporting component 2, described supporting component 2 is fixed on ground plate assembly 3 central authorities, described half opening cylindrical cavity assembly 4 is coaxially installed near ground plate assembly 3 back side, described polarization isolation merit separating device 5 is installed on the center, the back side of described ground plate assembly 3, described central radiating element assembly 1 is connected with polarization isolation merit separating device 5 through the coaxial inner conductor that supporting component 2 is built-in, and antenna is sealed in wave transparent encapsulated antenna cover 6 completely.
The present invention adopts following technical scheme further.
1. the Wide-Band Design technology of cross covering of the fan oscillator and the wideband impedance match technology of the short short oscillator of capacitance compensation.
Centered by described central radiating element assembly 1, circle symmetrical structure, comprises four obtuse-angulate covering of the fan oscillators of bending, four described covering of the fan oscillator pairwise orthogonals, forms right-angled intersection radiating element.Inventive antenna central radiating element is made up of 4 orthogonal broadband covering of the fan oscillators, belong to short, short antenna, complete centrosymmetric structure, there is the stable radiation phase heart, by the design of exclusive widening frequency band and condensance compensation technique, achieve the Broadband Matching of feed.In 1.1-1.7MHz band, port standing-wave ratio VSWR≤1.2, meet the shared multifrequency of many stars, multimode application requirement completely.
2. four support bars and RF feed and the integration technology of mating.
Described supporting component 2 comprises four support bars, between two support bar Orthogonally arrangement, and each fan-shaped vibrator of described central radiating element assembly 1 is installed on four support bar top respectively, and four described covering of the fan oscillators keep phase co-altitude with ground plate assembly 3.
The coaxial inner conductor of two in four support bars of described supporting component 2 adjacent built-in band matching sections of support bar, one end of described coaxial inner conductor is connected on the support bar coaxial inner conductor of offside, and the other end is connected with the input of polarization isolation merit separating device 5; Two other support bar forms the auxiliary allotment coaxial line of bottom short circuit simultaneously, the auxiliary allotment coaxial line of described bottom short circuit makes offside support bar coaxial inner conductor and covering of the fan oscillator keep microwave joining by the distributed capacitance that top is formed, form the balanced feeding balun of 0 °/180 °, and form impedance allotting network with the coaxial line of offside support bar.Described central radiating element assembly top is by dielectric ring coaxial installation director.Described director adopts a metal plate.
Described support bar modular construction full symmetric, even if two oscillators and ground plate height do not maintain near λ/4, also can not cause the asymmetric of directional diagram because support bar outer wall occurs electric current.Oscillator height can be selected flexibly as required, stablize useful to the raising antenna phase heart.
Central radiating element assembly 1 of the present invention forms basic hemispheric beam element antenna with the ground plate 3 of suitable yardstick.Require that adjustable oscillator is apart from ground plate height according to antenna gain and cone of coverage, adjustment central radiating element assembly geometric parameter adjusts its antenna pattern.There is more flexibility and adaptability.
3. the suppression decay technique of radial metal plate effects on surface wave traveling on ground plate.
As shown in Figure 3,4, described ground plate assembly 3 is that upper surface is dull and stereotyped with the circular metal of multiple symmetrical Radial Coupling plate, and Radial Coupling plate forms cut-off planar waveguide between two, stops surface wave transmission.Described ground plate assembly completes the space filtering of directional diagram figuration, vital effect is served to raising multipaths restraint usefulness, the waveguide that described ground plate is formed is in cutoff modes state for the TE mould (surface wave) along ground plate radial transport, multiple radial flat board makes surface wave (TE mould) be attenuated in transmitting procedure, stray radiation is prevented to disturb, this anti-multipath mechanism of inventive antenna and chokes ring different, without the need to increasing antenna aperture size, its usefulness and frequency band are better than chokes loop antenna, this antenna structure is lighter and handier, compacter, more low cost, also there is more excellent anti-multipath usefulness, wider frequency bandwidth characteristics.
4. be with half opening cylindrical cavity his-and-hers watches ground roll and the stray electrical current suppression technology of slot.
As shown in Figure 4,5, described half opening cylindrical cavity assembly 4 is the annulus of 90 ° of bendings of multiple coaxial layer stacked strips slot.With ground plate assembly combine install time, form half opening cylindrical cavity.Centre forms short circuit, and cylindrical cavity opening part forms high impedance, stops stray electrical current and radiation thereof with sequential the acting on of ground plate assembly.On the chamber wall of the half opening cylindrical cavity of described band slot, equally spaced one group of slot is formed from openend, stop remaining stray electrical current to form circular current at chamber wall, quantity and the size of the dark and slot in described cylindrical cavity radius and chamber adjust as required, directly cause stray electrical current radiation completely suppressed.
With ground plate assembly combine install time, form half opening cylindrical cavity, its centre short circuit, cylindrical cavity opening part forms high impedance, stops stray electrical current; The half opening cylindrical cavity of existing band slot is all from the a-circle-by-a-circle installation in the edge of ground plate, and retaining ring is deeply near λ/4, make entire physical volume larger, the present invention adopts bending design from bottom ground plate, the size of the half opening cylindrical cavity of band slot is reduced greatly, the present invention passes through slot number and the length of the half opening cylindrical cavity of adjustment belt slot in addition, effectively can suppress the generation of residual surface ripple circular current, the back lobe that remaining circular current is formed can be suppressed completely, form likeness in form
normalized radiation pattern, wherein n carries out adjusting and selecting according to pattern requirements, and inventive antenna achieves the single lobe of the total space, without other, back lobe, and the navigation terminal receiver ideal orientation figure of the total space single main polarization (RHCP).Spuious loop circuit can be suppressed the impact of radiation by the adjustment of slot quantity and size, improve ability of anti-multipath further.
The present invention proposes the approach that three kinds are suppressed multipath, one is that Radial Coupling plate forms cut-off planar waveguide between two, stops surface wave transmission by dull and stereotyped at the circular metal of the multiple symmetrical Radial Coupling plate of ground plate upper surface design; Two is coaxially install half opening cylindrical cavity at ground plate module backside, stops stray electrical current and radiation thereof; Three is open multiple slot on the chamber wall of half opening cylindrical cavity, stops remaining stray electrical current to form circular current at chamber wall; Select the combination of one or more according to demand, to form required anti-multipath usefulness.
5. the polarization filtering of feeder equipment.
Described polarization isolation merit separating device 5 comprises two input ports and two output ports, two input ports are connected with the coaxial inner conductor of supporting component 2 respectively, in output port, the one end exporting RHCP signal is connected with receiver, and another output port is connected with absorption resistance.The LHCP signal absorption that described absorption resistance will be drawn thus, the power division network that described polarization isolation merit separating device is formed is different from general 3dB power splitter, it not only realizes, outside power division and 90 ° of phase shifts, to absorb, stop the interference to receiver direct signal to orthogonally polarized component LHCP.
6. wave transparent encapsulated antenna cover (6) described in is for being installed on the medium-tight cover outside antenna, and it penetrates the satellite navigation signals of L frequency range is almost loss-free, has waterproof, Anti-ice-and-snow, meets ground facility environment and adapts to requirement.
Technique scheme also comprises radome 6, and central radiating element assembly 1, supporting component 2, ground plate assembly 3, half opening cylindrical cavity assembly 4 and polarization isolation merit separating device 5 cover gets up by described radome 6.
Antenna of the present invention both can be used as passive antenna and had used, active antenna can be combined to form again with preselection filter and LNA, drawn by a cable 7 as during passive antenna, be connected by cable 7 and receiver radio frequency front end (or filter and LNA) as during active antenna.
The present invention is not increasing receiver configuration, do not adopt multi-antenna-unit treatment system and adaptive antenna, do not adopt normally used chokes ring structure (because this design can cause antenna volume, weight and cost obviously to increase yet, be not suitable for the design object of miniaturization, lightweight and low cost) when, only use single antenna, by the renewal of design concept and method for designing, comprehensively go out the GNSS receiver antenna of the novel high-acruracy survey type that is applicable to.
1. the prerequisite key performance of high-acruracy survey type GNSS receiver antenna captured by antenna of the present invention:
1) multiple frequency broad band, can receive multiple navigation satellite signal; 2) the circular polarization hemispheric beam of enough high-gains, directional diagram has high circular symmetry, and height roll-offs, ratio before and after high; 3) phase center of high stable; 4) good wide-angle circular polarization characteristics.
2. antenna described in this law achieves the high-acruracy survey type antenna pattern figuration of desirable high anti-multipath.
Inventive antenna possesses the high-acruracy survey type antenna pattern of desirable high anti-multipath.Specifically: its normalization antenna pattern should be the single lobe of total space likeness in form (1+cos θ)/2, without secondary lobe and back lobe; The total space is same main polarization (RHCP), covers angular domain without cross polarization.This realization of goal does not adopt conventional chokes ring to suppress, but utilizes the half opening cylindrical cavity of band slot to circular current suppression technology, realizes more excellent anti-multipath usefulness.
3. realize the miniaturization of antenna, lightweight and low cost;
Inventive antenna is intended not increasing receiver configuration, do not adopt multi-antenna-unit treatment system and adaptive antenna, 3D chokes ring and PBG (photo band gap is not adopted yet, photon band gap) structure when, only use single antenna, by the renewal of design concept and method for designing, comprehensively go out the GNSS receiver antenna of novel high-acruracy survey type.Inventive antenna must accomplish small-sized, light weight, highly reliable, low cost.
With existing similar antenna technology Performance comparision, the technological merit of antenna of the present invention is as follows.
1) broadband is suitable for and many stars, multimode GNSS compatible receiver adapted.Micro-strip paster antenna and four-arm spiral antenna are common conventional GPS antennas.All belong to mode of resonance antenna, be applicable to single-frequency or narrowband operation.Though inventive antenna is electronically small antenna, achieve the broadband character of miniature antenna, in 1.1GHz-1.6GHz band, VSWR can be less than 1.5:1.
2) there is good circular symmetry and wide-angle circular polarization characteristics.Inventive antenna is center circle symmetrical structure completely; Antenna pattern circle is symmetrical, in the work angular domain of ± 60 °, and circle asymmetry≤± 0.5dB; Wide-angle circular polarization, in the work angular domain of ± 60 °, AR≤2dB.
3) the present invention utilizes multiple centrosymmetric radial planar waveguide on ground plate, form the cut-off wave guided mode of his-and-hers watches ground roll and clutter, prevention radiated interference, the height achieving directional diagram roll-offs, high front and back are compared and good wide-angle circular polarization characteristics, greatly inhibits multipath effect.This not only reaches the anti-multipath effect using Ckoke ring, and is better than normally used Choke-Ring loop antenna in band spread and structure are gently little, compact.
4) the present invention is in the bore of Φ ~ 200mm, sequentially have employed the multiple method suppressing surface to involve clutter radiation, multipaths restraint successful is increased.Not only size, volume, weight obviously reduce compared with conventional Choke-Ring, and the frequency range restriction of going chokes ring to suppress, and multipaths restraint effect is thoroughly intact.
5) inventive antenna has very stable radiating phase center.In whole navigation frequency range, phase heart dispersion PCV (1 σ) is less than 1mm, meets the application demand of High-precision carrier phase measurement type receiver antenna completely.
6) projecting point of inventive antenna is that the feeder equipment of antenna not only realizes 4 circular polarization feeds to central radiating element, and exclusive polarization filtering performance, effectively isolates a multipath signal interference to received signal.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the high-acruracy survey type antenna of a high anti-multipath, it is characterized in that, comprise central radiating element assembly (1), supporting component (2), ground plate assembly (3), half opening cylindrical cavity assembly (4), polarization isolation merit separating device (5) and wave transparent encapsulated antenna cover (6);
Described central radiating element assembly (1) is fixed on the top of supporting component (2), described supporting component (2) is fixed on ground plate assembly (3) central authorities, described half opening cylindrical cavity assembly (4) is coaxially installed near ground plate assembly (3) back side, described polarization isolation merit separating device (5) is installed on the center, the back side of described ground plate assembly (3), described central radiating element assembly (1) is connected with polarization isolation merit separating device (5) through the coaxial inner conductor that supporting component (2) is built-in, antenna is sealed in wave transparent encapsulated antenna cover (6) completely.
2. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 1, it is characterized in that, circle symmetrical structure centered by described central radiating element assembly (1), comprise four identical obtuse-angulate covering of the fan oscillators of bending, four described covering of the fan oscillator pairwise orthogonals, form right-angled intersection radiating element.
3. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 2, it is characterized in that, described supporting component (2) comprises four support bars, support bar Orthogonally arrangement between two, each fan-shaped vibrator of described central radiating element assembly (1) is installed on four support bar top respectively, and four described covering of the fan oscillators keep phase co-altitude with ground plate assembly (3).
4. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 3, it is characterized in that, the coaxial inner conductor of two in four support bars of described supporting component (2) adjacent built-in band matching sections of support bar, one end of described coaxial inner conductor is connected on the support bar heart yearn of offside, the other end is connected with the input of polarization isolation merit separating device (5), forms the balanced feeding balun of 0 °/180 °; Two other support bar forms the auxiliary allotment coaxial line of bottom short circuit simultaneously, the auxiliary allotment coaxial line of described bottom short circuit makes offside support bar coaxial inner conductor and its covering of the fan oscillator keep microwave joining by the distributed capacitance that top is formed, and forms impedance allotting network with the coaxial line of offside support bar.
5. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 1, is characterized in that, described central radiating element assembly (1) top is by the coaxial installation of dielectric ring circular metal plate as director.
6. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 1, it is characterized in that, described ground plate assembly (3) is that upper surface is dull and stereotyped with the circular metal of multiple symmetrical Radial Coupling plate, Radial Coupling plate forms cut-off planar waveguide between two, stops surface wave transmission.
7. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 6, it is characterized in that, described half opening cylindrical cavity assembly (4) is the half opening cylindrical cavity of multiple coaxial layer stacked strips slot, with ground plate assembly (3) combine install time, centre forms short circuit, cylindrical cavity opening part forms high impedance, stops stray electrical current and radiation thereof with sequential the acting on of ground plate assembly.
8. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 7, it is characterized in that, on the chamber wall of the half opening cylindrical cavity of described band slot, equally spaced one group of slot is formed from openend, remaining stray electrical current is stoped to form circular current at chamber wall, quantity and the size of the dark and slot in described cylindrical cavity radius and chamber adjust as required, directly cause stray electrical current radiation completely suppressed.
9. the high-acruracy survey type antenna of a kind of high anti-multipath according to claim 1, it is characterized in that, described polarization isolation merit separating device (5) comprises two input ports and two output ports, two input ports are connected with the coaxial inner conductor of supporting component (2) respectively, in output port, the one end exporting RHCP signal is connected with receiver, and another output port is connected with absorption resistance.
10. a communication equipment, is characterized in that, comprises the high-acruracy survey type antenna of the high anti-multipath according to any one of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510284770.8A CN104966887B (en) | 2015-05-28 | 2015-05-28 | The high-acruracy survey type antenna and communication equipment of a kind of high anti-multipath |
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| CN201510284770.8A CN104966887B (en) | 2015-05-28 | 2015-05-28 | The high-acruracy survey type antenna and communication equipment of a kind of high anti-multipath |
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| CN104966887A true CN104966887A (en) | 2015-10-07 |
| CN104966887B CN104966887B (en) | 2017-12-19 |
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| CN201510284770.8A Active CN104966887B (en) | 2015-05-28 | 2015-05-28 | The high-acruracy survey type antenna and communication equipment of a kind of high anti-multipath |
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| CN108123206A (en) * | 2017-12-20 | 2018-06-05 | 深圳市华信天线技术有限公司 | A kind of antenna mounting seat and antenna |
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| CN109103587A (en) * | 2018-08-06 | 2018-12-28 | 上海海积信息科技股份有限公司 | A kind of new antenna |
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| CN110137673B (en) * | 2019-04-23 | 2020-05-19 | 南京恒舟准导航科技有限公司 | Mushroom head PNT combined antenna and equipment thereof |
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