Bipolarisation dipole ready-to-operate array of vhf band with wide-angle scan and method of calibration thereof

FIELD: physics.

SUBSTANCE: invention refers to antenna engineering and can be used for production, at manufacturing plants, of dipole, phased or digital arrays (A) for signal reception/transfer within VHF range with various polarisation within wide single-beam scanning sector, that is in production period and cost, less by a factor of ten than production of conventional large-dimensioned arrays. The invention consists in that design of ready-to-operate array includes carrying submodule trusses whereon are fixed and galvanic ally coupled in either square or orthogonal curtain the identical prefabricated antenna modules representing vibrator arrays of coherent parameters, with orthogonal arms (cross-vibrators) inclined at an angle 45° to screen plane of single standard dimension-type, with arm length of horizontally polarised vibrator Lhor=0.463λo and vertically polarised vibrator Lvert. = 0.452λo, their height being equal h=0.226λo over conducting screen. Cross-vibrators are placed in array curtain along triangular mesh in the form of isosceles triangles with angularly placed vibrators, coordinate distances between their columns being dx=0.45λo and between their lines dy=0.32λo. Array is calibrated by experiment-calculated method with scattering matrix evaluation and VSWR calculation within its small fragment from 37 cross-vibrators of adjustable dimensions for fine adjustment until optimum dimension-type of required VSWR is attained. To provide ready-to-assembly array in-site in short terms, fit-up and adjustment of array curtain is carried out at a manufacturing plant.

EFFECT: extended scanning sector with matching of completely built-up array within whole scan sector up to ±60° at considerably reduced of time of array calibration and its setting into operation.

5 cl, 4 dwg

 

The invention relates to antenna technique and can be used to create the array, phased or digital antenna arrays large size (hundreds of meters) for receiving/transmitting signals in the VHF frequency range different polarization in a wide angle sector.

The complexity of designing a wide angle, vibrator phased antenna arrays (PAA) large size is the exact definition of the parameters (size of the shoulders, height, geometry) vibrators and their relative position in the canvas antenna to provide high matching (VSWR<2) emitters in the structure of the lattice within the wide sector of angles (up to 120°) in connection with the increase of their mutual communication and mutual influence due to the reduction step of their location in the leaf antenna. Configuring data HEADLIGHTS having more than a thousand emitters, is the most tedious, time-consuming and expensive process. The commissioning of such large HEADLIGHTS carried out in terms of 5-7 years. In addition, large HEADLIGHTS depend on external operational factors that involves the use of radiation transparent cover (RPU), the creation and maintenance of the microclimate system, which significantly increases the cost of the antenna. In this regard, there is a need to create an antenna array high factory readiness (AR VZG), the hen in the conditions of factory manufactured and tested fragments FAR the antenna modules are then mounted on the object operation without electrical inspections that will substantially reduce the cost and time of creation of such HEADLIGHTS.

Known phased array of large size, operating in a wide sector. For example, HEADLIGHTS for air trajectory of the radar field of view ±45° ("Theory and analysis of phased antenna arrays". Namita, Valinda, CBU, Moscow, Publishing house "Mir", 1974) and reception HEADLIGHT meter range radar station (radar) Darial (Radio, 2005, No. 1, pp.5-6) size (100×100) meters in the meter range with sector single-beam swing beam of order ±45°selected as a prototype. Both considered HEADLIGHTS are part of the building (the front wall), which is radar.

The disadvantages of these oversized HEADLIGHTS are a great period of construction, start-up and commissioning (up to 10 years), high cost and complexity of the work, and they do not provide the necessary wide-angle scanning in sector 120°. The creation of such antennas require major construction of the building, which costs a significant portion of the cost of the station. Significantly extends the period of development of antennas and radar, because they are interrelated.

In the prototype HEADLIGHT consists of modules combined is a total canvas representing a structure of the lattice of 32 emitters in the form of two orthogonal dipoles with horizontal shoulders. The excitation of the vibrator through "active" rack, representing a coaxial line. The center conductor of the line wash of brass rod. Rack and shoulders vibrator is made from pieces of brass pipes.

The objectives of this invention are:

- expansion of the sector scan to ±60°;

- coordination of the fully assembled AR in the whole field of view and a given bandwidth for VSWR≤2.0÷2.5 in each vibrator;

- reduction of setup time AR for receiving/transmitting signals of different polarization in a given frequency range and sector scan ±60;

- creating AR high factory readiness of lower cost, high technological prefabrication, Assembly, and adjustment to shorten the time of commissioning;

- provide performance outdoors.

This invention solves all the tasks. Canvas art consists of antenna modules (fragments AR), a fully manufactured and configured for optimal coordination in terms of wide-angle scanning at the factory, the design of which is made of vibrators single, univicion the frame for serial production size. While the exact parameters of the vibrator, the step and the configuration of the lattice module installed in the configuration process based on the given requirements AR. To ensure full factory readiness for installation of the antenna on the object in a short time on the factory-made Assembly (layout) canvas art.

Technical results are:

- expansion of the sector scan to ±60°;

- coordination of the fully assembled antenna in the entire field of view and a given bandwidth for VSWR≤2.0÷2.5 in each emitter;

- decreased time adjustment of the antenna.

The essence of the invention and the achievement of these technical results is that the design of the two-polarization, vibrator antenna array with high factory readiness with wide-angle scanning consists of bearing odnodolnyh farms on which they are mounted and electrically connected in square or rectangular canvas conductive plates of the same antenna modules prefabricated representing arrays of vibrators with agreed parameters, orthogonal spaced shoulders (cross-vibrators), inclined at an angle of 45° to the screen plane, uniform size, with shoulder length horizontally-polarized vibrator L.=0,463; Oh and vertically polarized vibrator L=0,452λat the same height h=0,226λo) their location on a conductive mesh screen, electrically connected with the conductive plates secured along the perimeter of the module, while the cross-vibrators placed in the canvas antenna on a triangular grid in the form of isosceles triangles, the angles of which are vibrators with distances on the coordinate axes between their columns dx=0,45λo and between their rows dy=0,32λo.

Expansion of the sector single scan to ±60° is provided with a choice of mesh placement cross-vibrators in the corners of an isosceles triangle with distances on the coordinate axes between the columns cross-vibrators dx=0,45λand between rows dy=0,32λOh, and the shoulders of the vibrator at an angle of 45° to the plane of the screen.

The agreement fully assembled antenna in the entire field of view and a given bandwidth for VSWR≤2.0÷2.5 in each vibrator is ensured by selection of the parameters of a single vibrator by changing the dimensions of the shoulders and the height of their location on the screen (column height) when setting up the experimental module.

The challenge of reducing setup time AR for receiving/transmitting signals of different polarization in a given frequency range and sector scan ±60° javljaetsja difficult task.

There are programs for calculation of the characteristics of the HEADLIGHTS with allowance for the interaction between emitters on the scattering matrices, which allow, given the requirements of the HEADLIGHTS to calculate its approval, for example (Westiepoo, S. Pavlov, Izv. universities MB and MDA USSR, Electronics (Moscow), 1984, No. 2, p.71-74).

But this method does not have sufficient rigor electrodynamic analysis on the best coordination in a wide solid angle and does not allow to determine precisely the optimal sizes of vibrators with regard to their design features, as well as the specifics of the construction of large HEADLIGHTS. Therefore there is a need for adjustment and the adjustment is made entirely of LIGHTS. It is very time consuming, not automated and requires a lot of time on the final configuration of the HEADLAMP and its putting into operation.

To reduce setup time, a method that allows to reduce the period of time. In the proposed antenna configuration of the antenna array is the calculation-experimental method the experimental fragment AR no phasers, which reduces the cost, consisting of the cross-vibrators, pre-designed with adjustable sizes shoulders and height of the racks within ±5%, changing that when it is configured on the specified characteristics of AR, determine the parameters of a single cross-vibrator. the AMI selected antenna of the three rings surrounding the Central cross-vibrator. When a triangular grid arrangement the cross-vibrators on the canvas, their number is N=37. Measured the row elements of the scattering matrix (coefficients of mutual communication) fragment AR relatively excited Central cross-vibrator under the number n. Calculated reflection coefficient at the input of the Central cross-vibrator under the number n by the formula:

where;

Sni- measured elements of the n-th row of the square matrix scattering;

xi,icoordinates cross-vibrators number i;

xn, yncoordinates excited Central cross-vibrator n;

λ wavelength;

αxythe angles between the direction of maximum beam and the axes x, y rectangular coordinate system located in the plane of the screen grid. Current SWR at the input of the cross-vibrator n was determined by the formula:

If you receive the CWS does not meet desired, by changing the sizes of vibrators fragment AR, again carry out measurement and calculation of the reflection coefficient by the formula (1). Only two or three iterations of the measure to achieve the desired values of the matching of the antenna azimuth ±60° and operating frequency range.

This method is otherwise accurate matching than 10%. Configured in the lattice cross-vibrator is extracted from the antenna, almereyda in free space, then the manufacturer is transmitted to the drawings and technical specifications (TS) to the cross-vibrator. Made cross-vibrators are installed in the antenna modules.

The task of reducing costs and shortening commissioning of AR compared with the prototype is solved at the expense of a significant reduction in the complexity of the creation and configuration of the entire AR due to the fact that there is no need in the construction for mounting the blade antenna, and are carrying farm, on which are mounted antenna configured modules manufacturing plant, which plant are the control Assembly to align the entire canvas and determine the exact holes for connection on site installation. In addition, for the manufacture of vibrators instead of brass is used cheaper steel.

The task of the health outdoors is solved by the design of the vibrator, its power supply and connect it with posts. The vibrator is made of steel pipes. The shoulders of the vibrator are connected to the posts by welding. In the feeding rack vibrator laid photostability cable RK50-17-s who works outdoors. To protect the vibrator from atmospheric influences is used conductors is completed with the ZINGA coating, and the surface of the uprights and arms of the vibrator becomes organosilicate composition OS-12-03. The region of excitation of the vibrator is sealed by pouring compound with a dielectric constant ε≈a 3.0. The effect of the compound on the parameters of the vibrator is compensated by the change of the size of his shoulders and the distance to the screen.

For AR-mode circular polarization or two independent orthogonal linear polarizations are used vibrators orthogonal spaced shoulders (cross-vibrators). The location of the cross-vibrators in the corners of an isosceles triangle creates unequal conditions of interconnection for vibrators horizontal and vertical polarizations. In the optimal setting of cross-vibrator at the same height from the antenna screen vibrators horizontal and vertical polarizations, the size of their shoulders is different and equal L.=0,452λfor vertically polarized vibrator and L.=0,463λfor horizontally-polarized vibrator.

The invention is disclosed by the drawings, where

1 shows a block diagram of the construction of the inventive antenna array with high factory readiness.

Figure 2 presents the layout of the vibrators in the module.

Figure 3 shows the design of the vibrator.

Figure 4 shows g is afici matching of the antenna array.

As is seen in figure 1 scheme of construction of the inventive antenna array, it consists of odnodolnyh farms 1 and antenna modules fragments AR (13.5×2.5 m) 2, manufactured at the plant, which are electrically connected by a conductive plates 3 for General education band antenna. For accuracy of Assembly of the modules into the fabric of the antenna on the factory produce their control Assembly as follows:

- In the frame are mounted three modules. Is the alignment angle and plane. Precise holes are drilled and are accurate bolting. The first of the three modules is removed, and the third attaches a new module. The second becomes the first, the third the second. Again control is an Assembly of three modules. Thus there is a control Assembly sequentially all antenna modules.

- Odnodolnye farm pass the same test Assembly.

- After installation of the radiators of the antenna modules are packaged and sent to the site.

- Odnodolnye farm mounted on a pre-prepared Foundation that is not associated with the building.

Onsite installation of modules with podmogilnyj farms going by connecting an exact holes.

The antenna Assembly takes no more than 2 weeks compared with m the OIG months, required for radar antennas Darial, i.e. accelerated 20-30 times.

Figure 2 presents a fragment of canvas art, the antenna module 2 with a triangular grid arrangement of vibrators over 4 mesh screen 5 in the form of isosceles triangles with equal sides dx=0,45λand the basis 2dy=0,32×2λO.

Figure 3 shows the design of the vibrator 4, installed and washing. Design cross-vibrator made of steel tubes and consists of orthogonal horizontally polarized 6 and vertically polarized shoulders 7 of the vibrator length L.=0,463 λand L.=0,452 λo, secured to the uprights 8, 9 of the same height, equal to h=0,226 λo at an angle of 45° to them by welding and installed on the screen using the flange 13. In the feeding rack 8 is laid photostability cable RK50-17-51c 10. The region of excitation of the vibrator 11 is sealed by pouring compound with a dielectric constant ε≈3.0 and is closed by a dielectric cover 12.

Figure 4 shows the graphs of the result of the matching of the antenna array in azimuth ±60° from the normal to the plane of the antenna obtained when configuring a fragment of the antenna array.

The creation of the antenna in terms of the manufacturer of identical modules of the proposed design, fully configured for coordination in a wide solid angle (120° and a given frequency range, and the refusal of the construction and alignment of the entire antenna paintings by replacing the control Assembly and docking modules and odnodolnyh farms in conditions of factory assembled on the object by means of the control holes and exact bolts allow to solve all the tasks, including the most important - decreasing order of cost and time of construction and putting into operation of this antenna compared to the existing antenna arrays.

1. Two-polarization array antenna array high factory readiness meter range with wide-angle scanning, containing a support on which are mounted and electrically connected in square or rectangular canvas conductive plates of the antenna modules, consisting of vibrators orthogonal spaced shoulders (cross-vibrators), mounted on the rack height h, placed in a cloth on a triangular mesh over a conductive mesh screen, which is connected with the conductive plates secured along the perimeter of the module, characterized in that the support is executed in the form of bearing, odnodolnyh farms, which are attached to the same antenna modules prefabricated representing a grid of cross-vibrators with inclined shoulders at an angle of 45° to the plane of the screen, placed on trapolin the th grid in the corners of an isosceles triangle with distances on the coordinate axes between the columns cross-vibrators dx=0,45λ o and between rows dy=0,32λo, the size of the cross-vibrators (the size of the shoulders and the height of the racks) unified when configured for optimal coordination of the sector scan with a maximum value of standing wave ratio (VSWR) of not more than 2.5 and corresponds to the length of the shoulders for horizontally-polarized vibrator equal to Lmountains.=0,463λo, and for vertically polarized vibrator equal to LVert.=0,452λand, at the same height of the racks is equal to h=0,226λo where λ - the average wavelength of the operating frequency range.

2. Antenna array according to claim 1, characterized in that the shoulders of the cross-vibrator and its rack made of steel tubes connected by welding.

3. Antenna array according to claim 1, characterized in that the feeding rack cross-vibrator laid photostability cable RK-50-17-51, and the region of excitation sealed compound with a dielectric constant ε≈3,0.

4. Antenna array according to claim 1, characterized in that in the design of the modules and odnodolnyh farms holes and bolts for attaching the modules to farms and installation without adjustment of the antenna as a whole on the object whose location is accurately installed in the control Assembly at the factory.

5. The way to configure two-polarization, vibrator antenna array (AR) high prefabrication m is Travego range with wide-angle scanning namely, that in accordance with predetermined characteristics of the AR, is calculated mutual location of the cross-dipoles in the lattice and prior to their size and geometry, which are then refined to obtain the best agreement in the working frequency band and a given sector of angles, wherein the created experimental fragment vibrating lattice, consisting of 37 numbered cross-vibrators (with numbers i=1, ..., 37) with adjustable sizes within ±5%, arranged in 3 rings around the Central cross-vibrator with the number "p", which excited sequentially at three frequencies (two boundary and Central) frequency band, with simultaneous measurement of the elements of the scattering matrices of the other, which is loaded on the matched load cross-vibrators relatively excited Central and calculation of the reflection coefficient and the current SWR at the input of the cross-vibrator under the number "n" by the formulas:

where;

Sni - measured elements of the n-th row of the square of the scattering matrix of a fragment of the lattice;

λ wavelength;

xi, yithe coordinates of the emitter with the number "i";

xn, yncoordinates vozbuzhdeno the Central cross-vibrator with the number "n";

αxthat αythe angles between the direction of maximum beam and the x, y rectangular coordinate system located on the screen plane lattice;

at each step in the research is used to set up a Central cross-vibrator changing its parameters (dimensions of the shoulders and the height of the uprights) for best SWR, upon receipt of which, the size of the other vibrators exhibited identical Central and is similar to the operation of adjustment of the Central vibrator to obtain the optimal size of the cross-vibrator is required by the CWS in the sector of angles and frequencies of the entire antenna array.



 

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