JPS61100029A - Transmitter - Google Patents

Abstract

PURPOSE:To transmit a high power output signal with a high duty ratio easily by providing plural transmission output stage circuits setting an optional signal length and transmitting a transmission signal and applying and outputting the transmission signal selectively to the circuit. CONSTITUTION:After a transmission signal generated by an oscillation circuit 11 and exciting circuit 12 in the secondary supervisory radar for air control is modulated at a modulation signal 13 by using a modulation signal from a control circuit 18, the result is led to a moving input terminal (a) of a switch circuit 14. Transmission output stage circuit 151-15n are connected to output terminals b1-bn of the circuit 14, an output of the circuits 151-15n is given to terminals C1-Cn of a switch circuit 16 respectively and outputted from a moving terminal (d) of the circuit 16. An operation supervisory circuit 17 detects which of the circuits 151-15n is in the transmission output state, the information is transmitted to the circuit 18, the circuit 18 generates a modulation signal in response to a questionnaire signal to be transmitted and generates a switching circuit taking the operating state of the circuits 151-15n into account, controls the circuits 14, 16 switchingly and an output is obtained from the terminal (d) of the circuit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a transmitting device applicable to, for example, a secondary surveillance radar of an air traffic control radar.

[Technical background of the invention and its problems] As is well known, the secondary surveillance radar (SSR) transmits an interrogation signal to an aircraft, receives a response signal from the aircraft, and identifies the aircraft a1. . As a method of transmitting the interrogation signal, for example, as shown in FIG.
When C is present in the beam tiilD, the signals A'', 8' as shown in FIG.

C' (signal length is R), respectively
．． There is a method of transmitting it as an interrogation signal for 0. In this case, the interrogation signal is almost continuous CW at time T.
It has a double signal, has an extremely high duty ratio, and requires high power. Outputting a high-power signal with such a high duty ratio using a single transmitter causes problems such as heat radiation and cooling of the transmission output stage, which increases the size of the device and increases the cost.

[Object of the Invention] The present invention has been made in consideration of the above-mentioned circumstances, and it is an object of the present invention to provide a transmitting device that has a simple configuration and is capable of easily transmitting a high duty ratio, high power output signal. With the goal.

[Summary of the Invention] That is, the transmitting device according to the present invention includes a plurality of transmission output stage circuits that output a transmission signal by setting an arbitrary signal length, and selects a transmission signal to the plurality of transmission output stage circuits. The present invention is characterized in that it is controlled so as to selectively derive the output of the transmission output stage circuit that is supplied to the transmission output stage in conjunction with the output of the transmission output stage circuit.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.

FIG. 1 shows its configuration, in which a transmission signal generated by an oscillation circuit 11 and an excitation circuit 12 is modulated by a modulation signal from a control circuit 18, which will be described later, in a modulation circuit 13.
It is led out to the movable input terminal a of the first switch circuit 14.

This first switch circuit 14 has n output terminals b1 to bn.
The movable input terminal a is selectively connected to n output terminals b1 to bn according to a switching signal, and each output terminal b
1 to bn are connected to n transmission output stage circuits 151 to 15n. Then, these n transmission output stage circuits 151 to 1
5n transmission output terminals are connected to n input terminals C1 to cn of the second switch circuit 16, respectively. The second switch circuit 16 is configured to selectively connect the movable output @d to the n input terminals C1 to cn in accordance with the switching signal so as to operate in conjunction with the first switch circuit 14. The interrogation signal selected by this second switch circuit 16 is sent out from an antenna (not shown).

Further, the transmission output stage circuits 151 to 15n are configured to output a status signal according to the output operation status,
Each status signal is supplied to the operation monitoring circuit 17. The operation monitoring circuit 17 detects which of the n transmission output stage circuits 151 to 15n is in the transmission output state by inputting each status signal, and transmits this information to the crime control circuit 18. be.

This control circuit 18 is composed of, for example, an electronic calculation line, and generates the modulation signal according to the interrogation signal to be transmitted, and also generates the switching signal in consideration of the operating state of the transmission output stage circuits 151 to 15n. Generate and switch circuit 1
4.16.

That is, corresponding to the explanation of FIGS. 2 and 3, n=3, and the interrogation signal A' is output from the first transmission output stage circuit 151, the interrogation signal B' is output from the second transmission output stage circuit 152, and the interrogation signal B' is output from the third transmission output stage circuit 151. It is assumed that the interrogation signal C- is outputted from the transmission output stage circuit 153 of . At this time, the first and second switch circuits 14.
16 is the first, second,
By selectively connecting them in the third order, the continuous interrogation signals IM, B", and C- as shown in FIG. A high duty ratio, high power output of 1q can be easily achieved by sequentially switching the interrogation signals and continuously sending interrogation signals.

In this case, regarding one transmission output stage 151,
After outputting the signal A', the signal B' is output.

There is no need to output any signal while C' is being output.

Therefore, the output duty ratio of one transmission output stage circuit may be low.

Therefore, the transmitting device configured as described above can obtain a duty ratio n times that of one transmission output stage circuit, so that a high duty ratio and high power output can be easily obtained with a simple configuration. Furthermore, it is also possible to provide more than n transmission output stages and use them as substitutes in the event of a failure, which also improves reliability.

It goes without saying that the present invention is applicable not only to secondary surveillance radars but also to devices that output high duty ratio signals.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a transmitting device that has a simple configuration and can easily transmit a signal with a high duty ratio and high power output.

[Brief explanation of drawings]

FIG. 1 is a block circuit configuration diagram showing one embodiment of a transmitting device according to the present invention, and FIGS. 2 and 3 are diagrams for explaining an interrogation signal transmission method of the transmitting device, respectively. 11... Oscillation circuit, 12... Excitation circuit, 13...
Modulation circuit, 14, 16... switch circuit, 151-1
5n... Transmission output stage circuit, 17... Operation monitoring circuit,
18...Control circuit. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 SR Figure 3 Police Closed-143=

Claims (1)

[Claims] A plurality of transmitting output stage circuits each outputting a transmitting signal by setting an arbitrary signal length, and a transmitting output stage that selectively supplies a transmitting signal to the plurality of transmitting output stage circuits and supplies the transmitting signal in conjunction with the multiple transmitting output stage circuits. 1. A transmitting device comprising: control means for selectively deriving the output of a circuit.