JPS6232379A - Radar device - Google Patents

Abstract

PURPOSE:To obtain a simple detecting circuit at a low cost by using in common the detecting circuits for transmitting and receiving outputs by using a hybrid, and using them on time division basis. CONSTITUTION:A part PT1 of a transmitting output which has been taken out by a directional coupler 3 is distributed by a hybrid 18, and one of them is applied to a phase detecting circuit 6 as a phase detecting signal PR2 of the transmitting output, mixed with a reference signal Ptr and a phase detecting signal VR1 of a transmitter is obtained. The other side is applied to a power detecting circuit 8 as a power detecting signal PR3 of the transmitting output, and a power detecting signal VR2 is obtained. Also, in a gap, etc. of the transmission/reception time, a transmitter high frequency part 2 is set to a non-operating state, and only a receiver high frequency part 12 is set to an operating state. A signal Pt1 is taken out by a directional coupler 17, and handled as the signal Ptr and an injecting signal Pr of the high frequency part 12. A signal Pr1 which has been injected to a directional coupler 10 is amplified by the high frequency 12. A part PR1 of this signal is taken out by a directional coupler 13 and distributed by the hydrid 18, applied to a detecting circuit of the transmitting output, and the signal VR1 and the power detecting signal VR2 are obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a radar device, and in particular, it simplifies the detection method when it is necessary to detect the output power and transmission phase of the high frequency part of the transmitter and receiver. This invention relates to a radar device using an amplification method.

[Conventional technology]

FIG. 2 shows an example of the output detection method of the high frequency parts of the transmitter and receiver in this type of radar device.

In FIG. 2, 1 is a directional coupler for extracting the transmission seed signal Pt for phase detection, 2 is a high frequency section of the transmitter, and 3
is a directional coupler for extracting the transmission output for power detection,
4 is a transmitting/receiving switch, 5 is an antenna, 6 is a phase detection circuit of the transmitter, 7 is a directional coupler for distributing the transmission output to phase detection and power detection, and 8 is an output power detection circuit of the transmitter. be.

9 is a directional coupler for extracting the reception reference signal Pr as a reference signal for phase detection; 10 is a directional coupler for injecting a signal into the receiver; 11 is a switch that is closed only during reception;
12 is a high frequency section of the receiver, 13 is a directional coupler for extracting the received output, 14 is a directional coupler for distributing the received output into phase detection and power detection, and 15 is output power detection of the receiver. The circuit 16 shows the phase output circuit of the receiver.

Next, the operation will be explained.

The transmission seed signal pt is amplified to a predetermined level by the high frequency section 2 of the transmitter, and is applied to the antenna 5 via the transmitter/receiver switch 4. The above-mentioned directional coupler 3.72 phase detection circuit 6. which simultaneously constitutes a transmission output detection circuit. And the power detection circuit 8 detects the phase characteristics and power characteristics of the transmission output. Further, the switch 11 is open at the transmission time in order to prevent characteristic deterioration of the high frequency section 12 of the receiver due to leakage power of the transmitter/receiver switch 4.

Similarly, the reception reference signal Pr is amplified to a predetermined level in the high frequency section 12 of the receiver, and is then amplified by the above-mentioned directional couplers 9, 10, 13° 14 and phase detection circuit 1, which constitute the reception output detection circuit.
5. And the power detection circuit 16 detects the phase characteristics and power characteristics of the received output.

At the reception time, the received wave incident on the antenna 5 passes through the transmitter/receiver selector 4 and the switch 11, and then reaches the high frequency section 12 of the receiver.
The received signal is then amplified and processed. At this time, the reception reference signal Pr is disconnected.

[Problem that the invention seeks to solve]

The output detection circuits of the high-frequency parts of the transmitters and receivers of conventional radar equipment are configured as described above, and each of the transmitters and receivers requires a detection circuit, which requires a large number of directional couplers. This has the disadvantage that the device becomes complicated and large due to necessity.

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide a radar device in which the number of directional couplers is reduced.

[Means for solving problems]

The radar device according to the present invention uses a transmission seed signal to detect both transmission and reception outputs in a time-division manner, and distributes the transmission output and reception output to the power and phase detection circuits using a hybrid. This is to make it common.

[Effect]

In this invention, since the transmission seed signal is used for rain detection of transmission and reception outputs in a time-sharing manner, there is no need for a reference signal for reception output detection, and since the detection circuit is shared by a hybrid, Only one detection circuit is required, and the number of directional couplers is also reduced.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a radar device according to an embodiment of the present invention. In the figure, the same symbols as in FIG. 2 indicate the same parts, 17 is a directional coupler for extracting a part of the transmission seed signal, 18
is a hybrid for distributing transmit power and receive power for phase and power detection.

Next, the operation will be explained.

At the transmission time, the transmission type signal pt is amplified by the high frequency section 2 of the transmitter and then supplied to the antenna 5 via the directional coupler 3 and the transmission/reception switch 4.

Part P of the transmission type signal taken out by the directional coupler 1 at the same time
t is used as a reference signal P1 for detecting the phase of the transmission output.

Furthermore, a part of the transmission output taken out by the directional coupler 3 P□
is distributed by the hybrid 18, and one is applied to the phase detection circuit 6 as the phase detection signal PTZ of the transmission output, and mixed with the above-mentioned reference signal Ptr to form the phase detection signal V of the transmitter.
t+ is obtained.

The other is applied to the power detection circuit 8 as a transmission output power detection signal PT3, and is a power detection signal V of the transmitter. is obtained.

Note that at the transmission time, the switch 11 is open;
The transmitting output is leaked to the high frequency section 12 of the receiver, and the high frequency section 12 of the receiver operates so as not to deteriorate its characteristics at the time of excessive input.

Next, a method for detecting the reception output of the high frequency section 12 of the receiver will be described. The high frequency section 12 of the receiver normally has a function of amplifying the received wave incident on the antenna 5, but in order to detect the received output, it receives and amplifies a part of the transmission type signal pt.

For this reason, during the gap between the transmission time and the reception time or any time period, the high frequency section 2 of the transmitter is inactive, and only the high frequency section 12 of the receiver is activated.

A portion pt of the transmission type signal Pt is extracted by the directional coupler 17 and treated as a phase detection reference signal Pt of the reception output and an injection signal P' of the high frequency section 12 of the receiver. Directional coupler 10 The transmission seed signal Pr+ injected into the receiver passes through the closed switch 11 and is amplified by the high frequency section 12 of the receiver. A part of this amplified signal P□ is taken out by the directional coupler 13. The signal is distributed by the hybrid 18 and applied to the aforementioned transmission output detection circuit to obtain a reception output phase detection signal Vll and power detection signal Vjl.

In addition, the directional couplers 3 and 1 are connected so that the transmitting output and the receiving output are at the same level at the stage when they are input to the hybrid 18.
The amount of binding in step 3 was adjusted.

In the device of this embodiment as described above, the transmission output or the reception output is distributed to the phase detection circuit and the power detection circuit by a hybrid, and the reception output detection reference signal and the phase detection reference signal are extracted from the transmission seed signal. As a result, only one detection circuit is required, the number of directional couplers can be reduced, the size and simplicity of the fruiting device can be reduced, and costs can also be reduced.

〔Effect of the invention〕

As described above, according to the present invention, the detection circuit for the transmission output and the reception output is made common by using a hybrid and used in a time-sharing manner, which simplifies the detection circuit and has the effect of being able to be configured at low cost. Arutsu

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a radar device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a conventional radar device. 1.10.17... Directional coupler, 2... Transmitter high frequency section, 6... Phase detection circuit, 8... Power detection circuit, 12... Receiving high frequency section, 18... hybrid. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A transmitter high frequency section that amplifies the transmission seed signal, a receiver high frequency section that amplifies the reception signal, and a directional coupler that extracts the transmission seed signal as a reception output detection reference signal or phase detection reference signal. , a directional coupler that inputs the received output detection reference signal to the receiver high frequency section; a phase detection circuit that uses the phase detection reference signal to detect the transmitted phase of the transmitted output or the received output; A power detection circuit that detects the output power of the reception output, and a hybrid that distributes and supplies the transmission output from the transmitter high frequency section or the reception output from the receiver high frequency section to the phase detection circuit and the power detection circuit. A radar device characterized by: