CN111781558B

CN111781558B - Expandable sub-array structure design method for phased array radar array surface

Info

Publication number: CN111781558B
Application number: CN202010537284.3A
Authority: CN
Inventors: 杨春鹏; 陈杨; 蒋廼倜; 李昕格; 李江
Original assignee: 724th Research Institute of CSIC
Current assignee: 724th Research Institute of CSIC
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2023-03-31
Anticipated expiration: 2040-06-12
Also published as: CN111781558A

Abstract

The invention discloses an expandable subarray structure design method for a phased array radar array surface, which comprises the steps of firstly analyzing an assembly size chain error, and taking one third of the allowable deviation of the radar array surface as a subarray design tolerance; then designing the dimensional tolerance of each mounting surface of the subarray according to the design tolerance; and finally, assembling the subarray array into an n multiplied by m radar array surface, wherein the probability that the assembling precision of the radar array surface meets the allowable deviation is 99.73%.

Description

Expandable sub-array structure design method for phased array radar array surface

Technical Field

The invention relates to an expandable subarray structure design method for a phased array radar array surface, in particular to a connection method for positioning and mounting during subarray expansion.

Background

The radar front is one of the most important hardware of the phased array radar. Generally, an antenna unit array, a data transceiving component, a power supply, water cooling and the like are integrated on a radar front surface, and the characteristics and difficulties of the radar front surface are high in integration level and complex in function. In order to improve the design efficiency, the radar array surface is divided into sub-arrays with the same scale, a single sub-array has all functions of a radar, a plurality of sub-arrays can be rapidly expanded into radar array surfaces with different scales, and the design method of the sub-arrays is the development direction of the phased array radar array surface.

Most of the existing radar array surfaces adopt a design method with the coexistence of integrated design and modular design. The design method is more generally applied in European and American countries, an antenna unit and a data receiving and transmitting component of the American SPY series radar array surface adopt a module design, and an antenna housing and an area array framework adopt an integral design of four-side corner cutting. The France Thales sea fire radar array surface adopts a design method similar to an SPY radar array surface, and is characterized in that each eight TR components and auxiliary components thereof can form an independent module, the independent module framework is formed by assembling processed plates, and the expanded assembly rigidity and assembly accuracy are poor. Compared with the foreign countries, the modularization degree is not high in the design of the domestic radar array surface. The modular design of the domestic radar array surface is mainly embodied on a TR component, and other designs mostly adopt integrated design.

As described above, the degree of modularity of the radar front is improved, and interchangeability, design efficiency, and the ability to quickly respond to the market can be improved. Therefore, there is still a need for a more thorough radar array with modular design, so that each module can be used independently and separately in structure, and a structural design method which overcomes the poor assembly accuracy after rapid expansion is provided.

Disclosure of Invention

In order to solve the problems of low modularization degree, poor assembly precision and the like of a radar array surface module in the prior art, the invention provides an expandable subarray structure design method for a phased array radar array surface.

The expandable subarray structure design method for the phased array radar array surface provided by the invention uses a normal distribution curve to analyze the error of an assembly size chain, and takes one third of the allowable deviation of the radar array surface as a subarray design tolerance; designing the dimensional tolerance of each mounting surface (horizontal direction, vertical direction and normal direction) of the subarray according to the design tolerance; the subarrays may be arrayed to assemble an n x m scale radar front.

Further, the sub-array comprises a sub-array frame 10, an antenna junction box 20, and a plurality of internal modules 30, wherein the antenna junction box 20 and the internal modules 30 are installed in the sub-array frame 10 to form the sub-array. The single sub-array has all the mechanism functions of the radar array surface, and the integration level is high.

Furthermore, the subarray frame 10 is integrally welded and formed, four concave positioning and mounting interfaces are designed on the upper and left sides of the outer portion, and four convex positioning and mounting interfaces are designed on the lower and right sides of the outer portion, so that the self rigidity of the subarray frame 10 and the connection rigidity between the subarray frame and the outer portion can be improved. The dimensional tolerance of all positioning and mounting interfaces is designed according to one third of the allowable deviation of a radar array surface; when the subarrays are expanded, the convex-concave parts between the subarray racks 10 are mutually positioned and screwed up and connected, and 6 degrees of freedom of each subarray are constrained.

The invention designs a more thorough sub-array with modular design, the probability that the assembly precision of the radar array surface meets the allowable deviation is 99.73 percent, and the confidence coefficient is higher; the single sub-array has all the mechanism functions of the radar array surface, and the integration level is high. Each subarray can be independently and separately used in structure and can be rapidly expanded, the problems of poor assembly precision and the like are solved, and the modularization degree, interchangeability, design efficiency and market rapid response capability of the radar array surface are improved.

Drawings

FIG. 1 is a diagram of the subarray composition according to an embodiment of the present invention.

Fig. 2 is a diagram of a submatrix outward expansion interface according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a sub-array expansion according to an embodiment of the present invention.

Wherein: 10 subarray machine frames; 20 an antenna adapter box; 30 an inner module; 10a, externally expanding an upper interface and a lower interface of the subarray; and 10b, externally expanding left and right interfaces by the sub-arrays.

Detailed Description

The design method of the present invention is further explained with reference to the drawings and the embodiments.

The radar array is divided into a plurality of sub-arrays according to the electric aperture of the radar array, and the sub-arrays are formed as shown in figure 1. Each subarray structure is consistent in size and can be arrayed. Each subarray includes a subarray chassis 10, an antenna transition box 20, and a number of internal modules 30.

The subarray frame 10 is integrally welded and then processed, and rigidity of the subarray frame is guaranteed.

The sub-array chassis 10 interfaces to the outside world as shown in figure 2. The convex-concave mounting surfaces are mutually positioned and then fastened by bolts, and the specific design method of the assembling precision is as follows:

taking one assembly direction as an example, the machined size distribution curve of each component ring of the size chain conforms to a normal distribution curve with the mathematical relationship:

wherein, x is the part size;

-the arithmetic mean of the dimensions of the part, equivalent to the basic dimensions of the part design;

y is the probability density that occurs for a part size of x;

and sigma is the mean square error of the part, and 6 sigma represents the distribution range of the machining size of the part.

n-number of parts.

For the sizes of a batch of parts, the probability of the parts distributed in the range of a normal distribution curve +/-3 sigma is 99.73 percent, the confidence coefficient is higher, and 3 sigma is equivalent to a design tolerance delta; for the modular subarrays, the characteristic sizes along the direction of the assembled array are consistent, and after the array is assembled, the size distribution curve of the array still conforms to the normal distribution curve.

The root mean square value of the dimensional tolerance after assembly of the array is:

in the formula, delta _i -design tolerance (mm), for modular design, the module size design tolerances are consistent, δ _i ＝δ＝3σ。

Therefore, Δ =3 σ, the assembled size is fit to the normal distribution curve, and the probability that the assembled size tolerance distribution is within ± 3 σ (i.e., ± 9 σ) of the normal distribution curve is 99.73% as can be seen from the same principle. It is reasonable to design one third of the allowable tolerance after assembly as the dimensional tolerance of the component rings. Considering that the number of the assembling rings is increased, the accidental factor is increased, the tolerance range allowed by the assembling can be exceeded, and the adjusting ring needs to be designed to adjust when necessary.

The schematic diagram of the expansion of the subarray is shown in fig. 3. The assembly sequence includes an antenna transition box 20 and a plurality of internal modules 30 loaded into the sub-array chassis 10 to form a sub-array. The subarrays may be arrayed to assemble an n x m scale radar front.

Claims

1. A method for designing an expandable subarray structure for a phased array radar array surface is characterized by comprising the following steps: the subarray comprises a subarray frame (10), an antenna adapter box (20) and a plurality of internal modules (30); the antenna adapter box (20) and the internal module (30) are arranged in the sub-array frame (10) to form a sub-array, and a single sub-array has all functions of a radar array surface; analyzing the error of the assembly size chain by using a normal distribution curve, and taking one third of the allowable structural deviation of the radar array surface as the design tolerance of the subarray; designing the size tolerance of each mounting surface for interconnection among the sub-arrays according to the design tolerance; the subarrays can be assembled into an n multiplied by m-scale flat radar array surface in a plane along two mutually vertical direction arrays; four concave positioning and mounting interfaces are respectively designed on the upper and left sides of the exterior of the subarray frame (10), and four convex positioning and mounting interfaces are respectively designed on the lower and right sides of the exterior; the dimensional tolerance of all positioning and mounting interfaces is designed according to one third of the allowable deviation of a radar array surface; when the subarray is expanded, convex-concave parts of the subarray machine frames (10) are mutually positioned and screwed tightly.