Monopulse antenna device

 

The invention relates to monopulse antenna units (AU) from the total differential signal processing in radar systems accurate automatic tracking and review monopulse radar systems. Monopulse antenna device comprises a flat antenna grid, divided at least into two sublattices, United with the device, the total differential of the signal processing performed on a dual waveguide tees. Rectangular waveguide differential input of the double tee is located in a plane parallel to the plane of the T-connection waveguides in the H-plane, has a T-connection common broad wall and connected with him through the communications window in this wall. To reconcile the total input of the double tee is pin D-shaped, one arm of which has a possibility of angular displacement in the E - and H-planes. The waveguide differential input can be perpendicular or parallel to the total input. For matching tee for a differential input is the matching element in the form of a pin or aperture. The technical result is the creation of a low-profile design of the monopulse antennaphotovoltaic details of antenna devices and significantly increase the percentage of yield in industrial production. 5 C.p. f-crystals, 7 Il.

The invention relates to monopulse antenna units (AU) from the total differential signal processing in radar systems accurate automatic tracking and review monopulse radar systems.

The antenna device is one of the key elements of monopulse radar, the characteristics of which largely depend on the design of the antenna system, which, inter alia, the requirement to reduce weight and size characteristics. The parameters AU largely determine the characteristics of RLS in General.

Monopulse antenna device is divided into sectors and must form a symmetric pair of directional diagrams) in each plane direction finding. Weekend days (total and at least one differential depending on the destination RLS) is formed using monopulse AU devices total differential signal processing. One of the main causes of failure of the required symmetry of the excitation sectors is inaccuracy of manufacture of elements of the antenna. Inevitably present technological error of parts manufacturing and Assembly of AU in PR the new error excitation sectors induce an increase in the level of side lobes, offset ravesignal direction, reducing the depth of zero and slope of the differential DN, reducing the coefficient of directed action that has a significant impact on the dynamical characteristics of the radar.

Known antenna device containing a flat antenna bars, four identical sectors (sublattice) which are powered through the total differential device of the four dual waveguide tees, implementing a monitoring mode in azimuth and elevation [1]. The disadvantage of this device is the inability to adjust and customize its settings.

Closest to the proposed invention monopulse antenna device in the form of a multimode antenna array radiating elements which are located in one plane and is divided into four sublattices, each of which is through its feeding waveguide, which is used to supply energy to the radiating elements of the sublattices, in connection with the device total differential signal processing [2]. This device serves to provide monopulse mode on two coordinates, azimuth and elevation, and is built on the basis of four double waveguide tees, each of which contains T-seeding with a third axis perpendicular to them is connected to the fourth waveguide, axis which passes through the point of intersection of the axes of the first three waveguides, and a wide wall of which is parallel to the axis of the third waveguide.

In such antenna devices any changes incoming nodes caused by technological error in the manufacturing process, lead to distortion of the output characteristics of the AU. Adjustment of parameters in such devices is impossible, which leads to the necessity of bringing high demands for precision manufacturing of parts and Assembly of the product, especially when the AU in the short wavelength side of the wavelength range. In addition, the design of the dual waveguide tee makes a low profile (small thickness), unit construction total and differential signal processing, which leads to higher dimensions AU.

The objective of this invention is to provide a low profile monopulse antenna device, providing the ability to adjust parameters of AU.

Offer monopulse antenna device comprises a flat antenna grid, divided at least into two sublattices, each of which is connected with the respective input waveguide device total differential treatments the three rectangular waveguides in the H-plane, the first and second of which are symmetrical shoulders tee, the third axis of the waveguide perpendicular to the axis of the first two, while the fourth rectangular waveguide dual waveguide tee, made short-circuited at one of its ends located in a plane parallel to the plane of the T-connection, which has a common wall, and a solenoid connected with him through the window of communication in this common wall. Moreover, in the overlapping area of the common axis of the first and second waveguides with the axis of the third rectangular waveguide has a matching pin D-shaped, one arm of which is parallel to the narrow walls of the waveguide, a second shoulder in their position parallel to the broad walls of the waveguide and directed in the direction opposite the entrance to the third waveguide, while the second shoulder of the pin is made with the possibility of angular displacement in N - and E-planes.

The window connection with the fourth waveguide is in the form of a slot, the longitudinal axis of which is parallel to the axis of the third rectangular waveguide.

In the fourth waveguide between his nezakonchennyy end and the connection box is selected, at least one matching element made in the form of a diaphragm or d is directed perpendicular or parallel to the axis of the third waveguide.

With a parallel arrangement of the third and fourth waveguides in the fourth waveguide between the connection box and its narrow wall parallel to it has a stimulating probe.

The present invention allows to partially compensate for the non-identity fabrication of arrays of AU, thereby reducing the error of the measurements. Instrument for decreasing values of phase and amplitude errors of the excitation of arrays of antennas and division of power in the device, signal processing, is set in the present invention a dual waveguide tee, made with the possibility of adjusting its parameters via pin D-shaped. Dual waveguide tee, and hence the entire device total differential signal processing has a height equal to twice the height of the waveguide. The proposed G-shape matching pin enables you to use when designing such devices low impedance waveguides (waveguide with a size ratio of wide and narrow walls more than two), which allows to construct the device with the lowest possible profile.

In Fig.1 shows a scheme of the monopulse AU device with sum-dierence processing signal the products dual waveguide tee with a mutually perpendicular arrangement of the third and fourth waveguides.

In Fig.4 shows a variant of the design of dual-waveguide tee with parallel arrangement of the third and fourth waveguides.

In Fig.5 presents the dependence of changes in the standing wave ratio voltage (VSWR) at the input of the third waveguide from the offset value (X) of the end of the second arm of the l-shaped matching pin from its normal position in the E-plane.

In Fig.6 presents a plot of the phase offsetsignals in the first and second waveguides from the deflection (Z) of the end of the second arm of the l-shaped matching pin from its normal position in the H-plane.

In Fig.7 presents a graph of amplitude unbalance (signals in the first and second waveguides from the deflection (Z) of the end of the second arm of the l-shaped matching pin from its normal position in the H-plane.

Offer monopulse antenna device, one option of which is schematically depicted in Fig.1, and the structure in Fig.2, is a flat antenna grid 1, is divided into four sublattice 2, 3, 4 and 5. Each sublattice is connected to the input of totally different is podreshetok 2 and 3 arrive at the inputs of tee 6, and the signals of the arrays 4 and 5 to the inputs of the tee 7. Signals with a total outputs () tees 6 and 7 are received at the inputs of the t-piece 8, the total output of which is connected with the total channel AU (AU), and Delta () - differential channel AU in azimuth (AZ). Signals with differential outputs tees 6 and 7 are received at the inputs of the tee 9, the total output of which is connected to a differential channel AU in elevation (MIND), and a differential with a matched load.

In transmission mode the video signal from the total input of AU in total inlet tee 8 and using the total differential of the device is divided equally between the sublattices 2, 3, 4, and 5.

Various embodiments of the dual waveguide tee according to the invention is shown in Fig.3 and 4. Dual waveguide tee contains a T-shaped connection in the H-plane of the three rectangular waveguides 10, 11 and 12. The waveguides 10 and 11 are symmetrical shoulders tee, the third axis of the waveguide 12 perpendicular to the axis of the first two. Thus the fourth waveguide 13, made short-circuited at one end, located in the plane, parallellinien waveguides via the communications window 14 in this common wall. To reconcile the dual waveguide tee by total input waveguide 12 in the overlapping area of the common axis of the first and second waveguides with the axis of the third set of matching pin 15 G-shaped. The first shoulder of the pin, one end of the fixed on the broad wall of the waveguide 10 and 11 on the axis of symmetry of the T-connections, parallel to the narrow walls of the waveguide. The second arm of the pin is located near the opposite broad wall, basically its position parallel to the broad walls of the waveguide and directed in the direction opposite the entrance to the third waveguide 12 along its axis. The second arm of the pin is made with the possibility of angular displacement (e.g., due to bending of the pin at the point of connection of his shoulders) in N - and E-planes.

The communications window 14 is in the form of a slot, the longitudinal axis of which is parallel to the axis of the waveguide 12.

To reconcile the dual waveguide tee for differential input waveguide 13) in the waveguide between his nezakonchennyy end and the connection box is selected, at least one matching element made in the form of a diaphragm 16. The matching element may also be made in the form of an additional pin.

In the present invention the axis of volnovodami parallel arrangement of the waveguides 12 and 13 (for example, if the location of the slotted window due to the symmetry axis of the waveguide 13) between the window and the narrow wall of the waveguide parallel to it has exciting pin 17 for the excitation of gap junction connections window.

In the apparatus shown in Fig.2, tees 6 and 7 have the design of the tee shown in Fig.3, and the tees 8 and 9 - the design of the tee shown in Fig.4.

In the proposed embodiments of the invention, the geometric dimensions and the location of the waveguides, slotted connections window, D-shaped pin, the location of the shorting wall of the waveguide 13, the matching apertures and pins, type double tee are selected from the conditions of approval to the inputs of the double tee and constructive reasons. L-shaped pin 15, as a matching element may be used to modify the coefficients of the scattering matrix of the double tee, in particular, it is possible to adjust the reflection coefficient at the input of the waveguide 12 and the transmission ratios between the waveguides 10, 12 and 11, 12. The angle between the first and second shoulders of a G-shaped pin can be changed by deflection of the second arm pin as in H-and E-plane. When the deviation in the E-plane changes the standing wave ratio voltage Sommaruga pin in the plane E from its basic position shown in Fig.5. The deviation of the pin in the H-plane changes the division ratio of power between the waveguides 10 and 11, and the deviation of the second arm in the direction of the waveguide, for example, 10 leads to the decrease of the modulus of the transmission factor in this shoulder. A plot of the offset capacity and phases at the outputs of the waveguides 10 and 11 when a signal is sent to the input of the waveguide 12 from the offset of the end of the second shoulder of the pin from its normal position in the plane H is shown in Fig.6 and 7. The presented results were obtained on models in 2-cm wavelength range. Double tees made for low impedance waveguides with an aspect ratio of about 7:1. In addition, the described waveguide tees were implemented on the fibres with an aspect ratio of about 5:1.

Using the ability of the double tee proposed design change own coefficients of the scattering matrix, the opportunity to adjust the total differential of the device, and consequently, to adjust the electrical parameters of an antenna device as a whole.

Thus, by changing the angular position of the second arm of the l-shaped pin in the t-piece 8 (Fig.1, 2) in the E-plane, it is possible to achieve the minimum VSWR on the total input of AU. Change uglovogo in azimuth. The change in angular position of the second arm pin in the tee 9 in E-plane allows you to configure VSWR differential channel in elevation. The change in angular position of the second arm pin in the t-piece 8 in the H-plane allows you to adjust the amount of depth zero differential pattern in azimuth, while minimizing the total non-identity signal emitters left (spectra 2 and 3) and right (spectra 4 and 5) of the sublattices, and changing the position of the second arm pins in the tees 6 and 7 to adjust the parameters of the differential diagram in elevation, of the upper (spectra 2 and 4) and lower (spectra 3 and 5) sublattice. Simultaneously with increasing depth zero differential chart orientation change occurs and some other parameters of AU, for example, increases the magnitude of the junction between the sum and difference channels.

As a specific implementation of the present invention examined the antenna device, the radiating curtain which divided into four sublattices, and the total differential device is built on four double tees. However, it is clear that there are other embodiments of the present invention. Depending on the purpose of radar systems the I sum-dierence devices may be different, but to remain within the scope of this invention. In addition, the total differential device may include a few adders/power divider used for power distribution elements or groups of elements of the sublattices, which are also built on a dual waveguide tees. Dual waveguide tee used in the present invention, may be useful when designing any devices that require optimization of parameters when adding/dividing the at least two signals, and when building devices using combiners/dividers power with isolated outputs.

The present invention can be used in the design of various monopulse AU using devices total differential processing of signals in the waveguide performance if you need a low-profile designs. As the antenna array in the present invention can be used waveguide-slot grille, antenna arrays of the open ends of the waveguides, and antenna arrays with radiating elements of any type that you can use waveguide device total differential signal processing. ISP devices to improve the weight and dimensions of products and significantly increase the percentage of yield in industrial production.

Sources of information

1. U.S. patent No. 4359742, Appl. 23.12.80, No. 219745, publ. 16.11.82. MCI H 01 Q 13/10, NCI 343/767.

2. U.S. patent No. 4376281, Appl. 23.12.80, No. 219744, publ. 08.03.83. MCI H 01 Q 13/10, NCI 343/768.

Claims

1. Monopulse antenna device containing a flat antenna lattice, separated by at least two sublattices, each of which is connected with the respective input waveguide device total differential of the signal processing performed on a dual waveguide tees, each of which contains a T-shaped connection of three rectangular waveguides in the H-plane, the first and second of which are symmetrical shoulders tee, the third axis of the waveguide perpendicular to the axis of the first two, characterized in that the fourth rectangular waveguide dual waveguide tee, made short-circuited at one end, is located in the plane parallel to the plane of the T-connection, which has a common wall, and a solenoid connected with him through the window of communication in this common wall, and in the overlapping area of the common axis of perucho which is parallel to the narrow walls of the waveguide, a second shoulder in their position parallel to the broad walls of the waveguide and directed in the direction opposite the entrance to the third waveguide, while the second shoulder of the pin is made with the possibility of angular displacement in N - and E-planes.

2. Monopulse antenna device according to p. 1, characterized in that the communications window is made in the form of a slot, the longitudinal axis of which is parallel to the axis of the third rectangular waveguide.

3. Monopulse antenna device under item 1 or 2, characterized in that in the fourth waveguide between his nezakonchennyy end and the communications window has at least one matching element made in the form of a diaphragm or an additional pin.

4. Monopulse antenna device according to p. 1, or 2, or 3, characterized in that the axis of the fourth waveguide dual waveguide tee directed perpendicular to the axis of the third waveguide.

5. Monopulse antenna device according to p. 1, or 2, or 3, characterized in that the axis of the fourth waveguide dual waveguide tee directed parallel to the axis of the third waveguide.

6. Monopulse antenna device according to p. 5, characterized in that in the fourth waveguide between the connection box and its narrow wall p

 

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