JPS58142606A - Monopulse antenna device - Google Patents

Abstract

PURPOSE:To increase angle error detecting sensitivity, by providing a pyramidical horn for detecting an angle error, on a notch part provided on the circumference of a quadruple ridge type horn. CONSTITUTION:On 4 notched parts of a square quadruple ridge horn F, angle error detecting horns A, B, C and D are placed so as to be fitted in. The horns A, B, C and D are pyramidical horns for constituting a monopulse horn. The cut-off wavelength of a fundamental wave of the horn F is decided by size of a ridge, but it becomes longer than cut-off wavelength of a fundamental wave of a square horn having the same inside diameter size. The inside diameter size and the ridge size of the horn are decided so that the wavelength by the lowest frequency of the angle error detecting frequency and the communicating frequency becomes shorter than the cut-off wavelength, and also the horns A, B, C and D are placed at intervals by which the angle error detecting sensitivity becomes the maximum.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an improvement of a monopulse antenna device which has a function for detecting angle changes from a target, such as azimuth angle or elevation angle, in addition to a communication function.

A monopulse horn using a plurality of pyramidal horns or conical horns is used as the primary radiator constituting this type of conventional antenna device, and the mutual arrangement and relative positional relationship of these horns is difficult.

The aperture size and the like are determined in consideration of the spillover of each horn, edge level, monopulse pattern crossover point, etc. As a result, one example is meIrfNI:l
One column as shown in column 1 is adopted. In FIG. 1, 14 pyramidal horns A, B, C, and D are arranged in a 1F square shape. If each horn in Fig. 1 is equipped with an angle +8' error detection function and a communication function, V[,
The power supply thread for each horn has a frequency for angle error detection;
! ! In addition to the need for wideband performance since it was used at a frequency for public use, it also had the disadvantage that the gain at communication frequencies was low.

Therefore, an arrangement is adopted in which a horn for N and a monopulse horn for angle error detection are provided separately and adjacent to each other, as shown in FIG. 2. In FIG. around (/(pyramidal horn A for angle error detection)
, B, C, and D are arranged in 11 trigonal shapes (consisting of 1-).

Here, according to Figure 3, 11g1 credit pawn and the corner to“
The operation when a monopulse horn for error detection is separately provided will be explained. In the figure, A, B, and C.

1), E corresponds to the five horns shown in Fig. 2, and for convenience of explanation, the received signals of the valley antenna are also represented by A, B, C, D, and E. do. The angle error detection device has four horns A, B, and C as shown in the figure.
, D, magic T0υ, (14, H, (l), horn E, and angle m" error detection frequency branching device are connected as shown in the figure.The difference terminal of magic T A non-reflection terminator tui is connected to (15&).

From the sum terminal (15b), the angle meter (difference signal of (A10) - (B + D) is sent. Also, the magic T (14
), a non-reflection terminator Q71 is connected to the sum terminal (14b), and an angular error signal (A1B)-(C10) is obtained from the difference terminal (14a). A sum signal E corresponding to (A + B + 〇 + D) is demultiplexed and obtained from the terminal (15a) as a reference signal for angle error detection by a demultiplexer (I) connected to the communication horn E. The communication signal passes through the duplexer tti and is sent to the terminal (15b
) can be obtained from

In such a system, priority is given to the communication function, and the monopulse horn for angle error detection is forced to have a design that deviates from the ideal. i.e. 1
When the communication horn E is a square horn, the inner diameter is selected to be larger than 0.5AL with respect to the wavelength λL at the lowest frequency used. Since the monopulse horns A, B, C, and D for angle error detection are arranged outside the communication water horn E located in the center, the distance between the horns becomes large, and the deviation angle of the beam from each horn also increases. growing. Therefore, there is a drawback that it is not possible to select the optimal crossover point of the monopulse pattern to maximize the angle error detection sensitivity, and this tendency is noticeable when the frequency for angle error detection is higher than the communication frequency. It had become.

The purpose of this invention is to set the crossover point of the monopulse pattern at an angle. The present invention provides a monopulse antenna device having a quadruple ridge shape.

Embodiments of the antenna device according to the present invention will be described below with reference to the drawings. FIG. 4 shows an example of a horn constituting the present invention. That is, in FIG. 4, A, B, C, and D are pyramidal horns constituting a monopulse horn for detecting angular errors.

F is a square geodle ridge type horn for communication. The cutoff wavelength of the fundamental wave of a square quadruple ridge horn is determined by the dimensions of the ridge, but it is known that it is longer than the cutoff wavelength of the fundamental wave of a square horn with the same inner diameter.

The inner diameter and ridge dimensions of the square geodle pull ridge type horn F are such that the wavelength at the lowest frequency of the angular error detection frequency and the communication frequency is shorter than the cutoff wavelength, so that the angular error detection sensitivity is maximized. The angle error detection monopulse horns A, B, C, and D are selected so that they can be arranged at intervals close to . This can be achieved by arranging the angle Iff' error detection horns A, B, C, and D so as to fit into the four notched portions of the square quadrangle rigid horn F. The horn configured in this way is used as a third
By replacing horn E with horn F in the circuit diagram shown in the figure, it is possible to detect angle errors efficiently, and the communication function is not impaired. This is another embodiment of the horn constituting the invention. That is, in FIG. 5, the horn is a circular geodle ridge type horn, and the other features are the same as in the embodiment shown in FIG. 4.

As described above, according to the present invention, the horn for communication between the two horns and the monopulse horn for detecting angular error are constructed separately, and the power supply system of the horn for detecting angular error is used only at the frequency for detecting angular error.

Even if a narrow band is sufficient and the angular error detection frequency is higher than the communication frequency, it is extremely effective in cases where both angular error detection and communication functions are required at the same time.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the horn arrangement in a conventional monopulse antenna device, Fig. 2 is a diagram showing another example of the horn arrangement, and Fig. 3 is a circuit configuration diagram illustrating the signal processing method. , FIG. 4 is a diagram showing an example of the arrangement of horns according to the present invention,
FIG. 5 is a diagram showing another example of horn arrangement according to the present invention. In the figure, A, B, C, Di angle error detection horn, E, F
, G is a communication horn, (++), 021. decoy. (l→ is magic T, Q!19 is demultiplexer, H, (I7
+ is a non-reflection terminator. In addition, the same reference numerals are used for the same or equivalent parts in the two figures.
-t is indicated. Agent Shin Kuzuno −23− と＜ω（Ω Rei Tate ■ −24−

Claims (1)

[Claims] A monopulse antenna device characterized in that four other horns are provided to fit into notches provided at four locations around a geodolle pull ridge type horn located at the center.