JPS60164260A - Antenna pattern measuring apparatus for monopulse antenna - Google Patents

Abstract

PURPOSE:To measure the sum pattern and the difference pattern simultaneously by connecting a sum channel terminal and a difference channel terminal of a monopulse antenna to an input terminal of a receiver with a switching. CONSTITUTION:A microwave signal sent from a transmitter 1 is radiated to a monopulse antenna 3 to be measured from a measuring antenna 2. The sum channel terminal 3a of the antenna 3 is connected to a terminal 8a of a microwave switch 8 while the difference channel terminal 3b to a terminal 8b thereof. In a receiver 6, the sum channel and the difference channel signal are measured synchronizing a change-over signal (a) for changing over the switch 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an antenna pattern measuring device for a monopulse antenna that is capable of simultaneously measuring a sum pattern and a difference pattern of a monopulse antenna.

[Prior art]

Fig. 1 is a diagram showing a conventional antenna pattern measuring device. In Fig. 91, (1) is a transmitter, (2) is a measurement antenna, and (3) is a measurement target placed opposite the measurement antenna. (4) is an antenna rotating table for fixing the monopulse antenna, (5) is a termination load, (6) is a receiver, and (7) is a pattern recorder that displays the measured antenna pattern.

The operation of the conventional antenna pattern measuring device configured as described above will be described below. The microwave signal output from the transmitter (11) is radiated from the measurement antenna (2) toward the monopulse antenna (3) to be measured.The microwave signal received by the monopulse antenna (3) is , are output as the sum channel signal and the difference channel signal of the monopulse antenna. In this figure, the sum channel terminal (8a) is connected to the receiver (6), and the difference channel terminal (3b) is connected to the terminating load. (5).The signal connected to the receiver (6) is converted and amplified into a video signal that can drive the pattern recorder (7) and sent to the pattern recorder (7).Meanwhile, the antenna rotates. The angle signal from the stand (4) is also sent to the pattern recorder (7), and the pattern recorder (7) displays the sum channel signal of the monopulse antenna corresponding to the above-mentioned angle as an antenna sum pattern.

In a similar operation, the antenna difference pattern can be measured and displayed by connecting the sum channel terminal (8a) of the monopulse antenna to the terminating load (5) and the difference channel terminal (8b) to the receiver (6). I can do it.

However, in order to measure the sum pattern and the difference pattern, it is necessary to reconnect the sum channel terminal and the difference channel terminal to the receiver as described above. There is a drawback that the sum pattern and difference pattern that correspond to the antenna rotation angle may deviate due to deviations such as mechanical backlash of the antenna rotation table that occur when the sum and difference patterns are overwritten on the pattern measurement paper. Ta.

[Summary of the invention]

This invention was made with the aim of improving this drawback, and includes a microwave switch that switches and connects the sum channel and the difference channel of the monopulse antenna to the terminating load or receiver, and the switching is performed in conjunction with the data sampling of the receiver. This invention proposes an antenna pattern measuring device for a monopulse antenna that can measure a sum pattern and a difference pattern at the same time by rotating the antenna rotary table once in synchronization.

[Embodiments of the invention]

FIG. 2 is a block diagram showing an embodiment of the present invention.
is the same as in FIG. (6) is a receiver having a function of generating a switching signal a to control the microwave switch (8), (9) is a computer, and a. is a recorder. Figure 3 is a diagram showing the operation timing in the receiver (6), where a is a switching signal, b is a sum pattern measurement sampling signal, C is a difference pattern measurement sampling signal, d is an antenna angle signal, and e is a sum pattern measurement signal. The pattern f is a difference pattern. FIG. 4 is an example of an antenna pattern diagram obtained by the above configuration, where A is an antenna sum pattern and mouth is an antenna difference pattern.

Regarding the above embodiment, its operation will be explained below. The microwave signal sent from the transmitter (11) is radiated from the measurement antenna (2) toward the monopulse antenna (3) to be measured.The sum channel terminal (8a) of the monopulse antenna (3) is connected to the microwave switch. (8) terminal (
8a), the difference channel terminal (3b) is connected to the terminal (8b), and the sum channel signal and the difference channel signal are sent to the receiver (6) via the terminal (8d). On the other hand, terminals (8c) and (8e) of the microwave switch (8)
are each terminated by a terminating load (5). As shown in FIG. 8, in the receiver (6), the switching signal aK that switches the microwave switch (8) is synchronized, and the sum channel signal and the difference channel signal are synchronized with the timing of the sum pattern sampling signal and the difference pattern sampling signal C. It is measured in The value obtained from this measurement field is sent to the subtractor (9) together with the antenna angle signal d corresponding to the antenna angle, and is displayed on the recorder α1. FIG. 4 shows the antenna pattern displayed on the recorder a1, in which the antenna sum pattern and the antenna difference pattern corresponding to the antenna angle are shown simultaneously on the same page.

Incidentally, although the above description has been made regarding the case where the antenna sum pattern and the antenna difference pattern are displayed simultaneously on the same sheet of paper, it is also possible to write them on separate sheets of paper depending on how the output of the computer is used. Moreover, although the above description describes the case of simultaneous measurement of the antenna sum pattern and the antenna difference pattern, it goes without saying that it can also be used to measure only one of them.

〔Effect of the invention〕

As explained above, the present invention is capable of measuring the antenna sum pattern and the antenna difference pattern in one antenna pattern measurement.

The advantage is that the measurement time can be halved compared to conventional measurements. 1. Since it is possible to measure under the same antenna conditions at the same time, it has the advantage of being able to accurately indicate the relative level difference between the antenna sum pattern and the antenna difference (turn). For electronically controlled antennas with variable performance.

The most important thing is that measurements can be taken under the same conditions.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional antenna pattern measuring device, Fig. 2- is a diagram showing an embodiment of the antenna pattern measuring device of the present invention, and Fig. 8 is a diagram showing the operation timing of a receiver in an embodiment of the present invention. FIG. 4 is a diagram showing an antenna pattern output by the apparatus of the present invention. In the figure, (1) is the transmitter, (2) is the measurement antenna,
(3) is a monopulse antenna, (4) is an antenna rotating table, (5) is a terminal load, (6) is a receiver, (8) is a microwave switch, (9) is a computer, Kasumi is a recorder, a
is a switching signal, b is a sum pattern measurement sampling signal, C
is the difference pattern measurement sampling signal. d is the antenna angle signal. Note that in FIG. 1, the same or corresponding parts are designated by the same reference numerals. Agent Masuo Oiwa

Claims (1)

[Claims] An antenna pattern measuring device for a monopulse antenna having a monopulse sum channel and a difference channel includes a rotary table for rotating the monopulse antenna, a transmitter, and a transmitter provided opposite to the monopulse antenna to receive a microwave signal from the transmitter. a measurement antenna that radiates in the direction of the monopulse antenna; a receiver that has a function of emitting a switching signal synchronized with data sampling and receives the sum channel signal and the difference channel signal of the monopulse antenna; and a switching signal of the receiver. The antenna pattern is measured using a microwave switch that selectively connects the sum channel terminal and difference channel terminal of the monopulse antenna to the input terminal of the receiver, and the output signal of the receiver and the angle signal of the monopulse antenna. An antenna pattern measuring device for a monopulse antenna, comprising a recording means.