JPS59217175A - Transmission apparatus - Google Patents

Abstract

PURPOSE:To enable circuit constitution reduced in power loss and free from impedance mismatching, by performing power distribution in modified type side- lobe suppression by a power distributor subjected to impedance matching. CONSTITUTION:When a change-over device 105 is changed over to dummy load 109 by a change-over gate 115, the output of a transmitter is consumed by the load 109. When the change-over device 105 is held under a continuity state, the output 101 of the transmitter is sent to output 113 for a control antenna. When the output terminal 102 for the control antenna is held under an open state by a change-over gate 114, a connection point 112 is also held under an open state. Therefore, the output from the change-over device 105 is sent to the antenna output 113. On the other hand, the antenna output terminal of the change-over device 105 is held under an open state, the impedance in the side of the change- over device 105 looked from the connection point is infinite. Therefore, all energy of the change-over device 105 is transmitted to the output 113 for the control antenna and, therefore, circuit constitution reduced in power loss and free from impedance mismatching can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to air traffic control equipment, and particularly relates to a transmitting device for suppressing side ropes in a secondary radar (hereinafter referred to as SS) system in a radar control system. Ru.

Conventionally, this type of secondary radar system uses a 3-pulse S and LS force formula to suppress side lobes, and an improved side rope suppression force formula to suppress spurious targets due to reflections in addition to the side lobes. ing. 3-pulse suppression force formula I CAO (International Civi
lAviation Organization)
This is a well-known method specified in the Recommendation Arrangement & 2% Wave Method, and the improved sidelobe suppression force method was also introduced on February 24, 1978'.
1975 IEICE Space Navigation Electronics Study Group Material 8 AN E 77-31 published by IEICE
Acid 1 technology in 88 liters...'' etc.

As is clear from the document, in the case of the improved sidelobe suppression force type, the first pulse (or PI pulse), which should originally be transmitted from the Nitchu gland for Kama, is also transmitted from the control antenna. The power radiated from the intermediate rudder is halved, reducing coverage (distance) by about 30 inches, while increasing transponder downtime.

Therefore, in practice, the use of the improved sidelobe should be kept to a minimum, and the present invention relates to switching between the 3-pulse sidelobe suppression force type and the improved sidelobe suppression method.

A system shown in FIG. 1 has been proposed as a switching system between the 3-pulse sidelobe suppression force type and the improved 3-pulse sidelobe suppression force type.

In FIG. 1, in the case of the 3-pulse SLS power type, the switch 3 is switched to the circuit shown by the dotted line. In this state, the first, second, and third pulses (PI, P2, and Pa) output from the transmitter (, ; 1161) are
, divided into third pulse P1, Pa and second pulse P2,
Pulse PL, Pa to interrogation antenna (Fig. 2, 8.9
(see FIG. 2, 10), and pulse P2 is sent to the control antenna (see FIG. 2, 10).

In the case of the improved sidelobe suppression force type, at the same time as the switch 3 is switched to the circuit shown by the solid line, the entire power of the V second pulse P2 is sent to the control antenna by the switch gate to the switch 2. (See FIG. 3, 10), half of the first pulse PIFi is sent to the control antenna O, and the remaining half is sent to the interrogation antenna G through the switch 4 (see FIG. 3, 8.9). Third
The entire power 11j of the pulse P3 is sent to the switch 4 through the switch 3 like the first pulse P1, but in order to match the power with the first pulse P1, half of its output is depleted by the pseudo load 5 ( (See Figure 3, 9).

As a result, a pulse Pi, 19, which is about half of the transmitter output, is sent to the interrogation antenna, and a pulse Pi, which has the same output as this, and a pulse P2, which is about the same as the transmitter output, are sent to the flilj II. A directional antenna as an interrogation antenna and an omnidirectional antenna as a control antenna allow improved sidelobe suppression.

However, this method has the following drawbacks. In other words, in the switching device 3, in order to test the P1 pulse as both the output for the Kama-Nitsu central line and the output for the control antenna, the gate 11 and the gate 12 are used at the timing of the pulse Pl.
It is necessary to conduct both directions by the operation of 20 manpower of the switch. As a result, if the characteristic impedance of the circuit is Zo, the input impedance of the switch 20 is Zo/
2, and the standing wave ratio in this case is 2. In other words, approximately 10% of the incident power returns to the input side as reflection and becomes a loss. Furthermore, the generation of rectangular waves due to impedance mismatching causes unnecessary pressure to be applied to circuit components.

The present invention has been made in view of the above-mentioned problem 1d of the conventional art, and therefore, an object of the present invention is to provide a novel transmitting device that can eliminate the above-mentioned drawbacks of the conventional art.

In order to achieve the above object, a transmitting device according to the present invention includes:
means for transmitting a transmission pulse including a control pulse for sidelobe suppression; a first switching means for separating the transmission pulse into output pulses for an interrogation central line and a control central line; a second switching means for switching to a three-pulse sidelobe suppression force type or an improved sidelobe suppression force type by bypassing the interrogation antenna output or switching to the next power divider; and an output from the second switching means. means for distributing the signal into two systems and separating the power into a first interrogation pulse and a second interrogation pulse as an output for the 1f antenna antenna; Effectively switching between the three-pulse sidelobe suppression force type and the improved sidelobe suppression force type by combining the interrogation pulse and the output pulse for the control antenna from the first switching means using a half-wavelength synthesis circuit. It is characterized by

That is, the present invention solves the drawbacks caused by impedance mismatching, and in order to switch between the 3-pulse sidelobe suppression force type and the improved 3-pulse sidelobe suppression force type, the output of the switch 3 is By adding a power component 'O* device and using a half-wavelength synthesis circuit, the pulses P1 and P2 sent from the control antenna are
It is determined by the method of synthesizing.

Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

An embodiment of the present invention is shown in FIG.

Misfire I! An example of a transmitting device using IJ is
A101, first switch 102, second switch 103,
It consists of a third switch 105, a power divider 1o4, a modulator (switched gate generator) 106 and a cable 107 having an integral multiple of two half wavelengths, ios.

The transmitter 101 transmits pulses P1 . Generates p2 and P3. Switcher 10
2 is the control pulse Pl, P3, which is generated by the transmission pulse between rt.
．． p3 is sent to the switch 103. The switch 103 is switched as shown by the dotted line when the 3-pulse sidelobe suppression method is selected from the switch signal 116 &
As shown in FIG. 5, the pulses Pi and P3 are sent as they are to the interrogation antenna output 111. - Switching GS No. 116
When the improved sideloop suppression method is selected, the pulse P is switched as shown by the solid line.
i, P3 are processed into the power divider 104, and as shown in FIG. .

Switcher 105! '; It acts to switch to the power of the pseudo load 109 by the switching gate 115 at the time of the pulse P3, so that the pulse P3 is consumed by the pseudo load 109. At the time of the pulse P1, the switch 105 is in a conductive state, thereby causing the pulse P1t/'i 6th
As shown in the figure, a control antenna output 113k is included.

At the time of the pulse P1, the control antenna output side of the switching device 102 is opened by the switching gate 114, and the connection point 11 located at an integral multiple of a half wavelength from the circular side is opened.
2 is also in an open state. Therefore, the total energy of the P1 pulse from the switch 105 is transferred to the center line output 113.
sent to. - At the time of power and Hals r2, the control of the switch 105 is in the open state, and the output side is in the open state.
The impedance on the switching device 105 side seen from the connection point 112 is infinite. Therefore, all the energy of the other pulses from the switch 102 is sent to the control antenna output 113.

As explained above, the present invention allows power distribution in the improved side rope suppression force formula to be performed using a power divider with interference matching.
Q) enables a circuit configuration with low power loss and no impedance mismatch.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of a conventional transmitter, and Figure 2 is a block diagram showing the configuration of a conventional transmitter.
The figure shows the waveform of the main part in the case of the 3-pulse side lobe suppression force type in Fig. 1, and the figure 3 shows the waveform of the main part in the case of the improved side lobe in Fig. M1.
FIG. 4 is a block diagram showing an embodiment of the transmitting device according to the present invention; FIG. This figure shows the waveforms of the main parts in the case of the improved sideloop suppression method in FIG. 4. 1. Heat transmitter, 2. Transmission pulse switch, 3...
Circuit switch, 4...ψ transmission pulse switch, 5, skewer/pseudo load, 6... switching gate generator, 101-... transmitter, 1o2・e@transmission pulse switch, 103... circuit Switching device, 1o411...Power divider, 105...-Il sending pulse switching device, 106...Switching gate generator, 107
, ios・-φ half-wavelength synthesis circuit, 1o9・fist・pseudo load, iio...transmission pulse including control pulse for sidelobe suppression, 111...output for interrogation antenna, 113-
...Applicant for output patent for control Nitrogen central line NEC Corporation Representative Patent attorney Yutabe Kumagai Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] means for sending out a transmission pulse including a control pulse for sideloop suppression; first switching means for separating the transmission pulse into output pulses for the interrogation antenna and the control antenna; a second switching means for switching to a three-pulse side 0-b suppression force type or an improved side lobe suppression force type by bypassing the output or switching to the next power divider; and an output from the second switching means. means for distributing the signal into two systems and separating power into the output for the interrogation antenna into a first interrogation pulse and a second interrogation pulse; By combining the output pulses for the control antenna from the switching means 1 with a half-wavelength synthesis circuit, the 3-pulse sidelobe suppression force type and the improved sidelobe suppression force type can be effectively switched. Transmitting device.