JPH09304509A - Transceiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transciver, which can inspect the transmitting state without emitting unnecessary radiowaves and can accurately inspect the receiving state without the effect of noises inputted through antenna. SOLUTION: A duplexer part 4 is provided between antennas 9 and 10 and transmitting and receiving parts 3 and 5. An interogation signal is transmitted, and the response signal from an aircraft sent back in correspondence with the interogation signal is received. In this transceiver, switching device 7 and 8 are inserted between the antennas 9 and 10 and the duplexer 4. At the normal time, the switching devices 7 and 8 are switched to the antenna side. When the transceiver is checked, the switching devices 7 and 8 are switched to the side of terminators 25 and 26. Thus, the operating state of the above described transceiver is cheked in this constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transceiver which receives a response signal from an aircraft which is returned in response to a transmitted inquiry signal, and more specifically, to the operating state of the transceiver without emitting unnecessary radio waves. The present invention relates to a transceiver that enables inspection.

[0002]

2. Description of the Related Art For example, for air traffic control for identifying an aircraft and obtaining altitude information from a transponder mounted on the aircraft.
A transmitter / receiver that transmits an inquiry signal and receives a response signal from an aircraft corresponding to the inquiry signal, like an interrogator of a secondary surveillance radar (SSR), is generally configured as shown in FIG. That is, in FIG. 2, the transceiver 101 transmits and receives the inquiry signal 111 and the two SUM antennas 107 and DIFF antennas 108 for receiving the response signal 113, and the RF output tx for the SUM output s and the DIFF antenna.
One of the outputs d is selected, the respective outputs are supplied to the two antennas and the response signal 113 is supplied to the receiving unit 105 via the two antennas, and the duplexer unit 104, The transmitter 103 and the receiver 105 connected to the duplexer 104 are provided, and
The reception unit 105 includes a reception self-test circuit 106 that supplies a pseudo reception signal rs and a processing unit 102 that is connected to each unit and supplies a control signal to each unit. Furthermore,
The duplexer unit 104 outputs the RF output tx supplied from the transmitting unit 103 to the SUM output s and the DIFF output d.
RF switch 20 for switching and outputting to either one of
1 and two circulators 202 and 203 connected to the RF switch 201, and an S monitor circuit 20 connected to the circulators 202 and 203.
4 and the D monitor circuit 205. Further, the S monitor circuit 204 and the D monitor circuit 205 are connected to the SUM antenna 107 and the DIFF antenna 108 via RF cables 109 and 110, respectively.

The operation of the above configuration will be described. First, in transmission, a transmission trigger t is supplied from the signal processing unit 102 to the transmission unit 103, and in the transmission unit 103, for example, an RF output t of a triple pulse train as shown in FIG.
Generate x. This RF output tx is the duplexer unit 10
As shown in FIGS. 3B and 3C, the RF switch 201 of FIG. 4 switches and outputs the SUM output s of the double pulse train and the DIFF output d of the single pulse, and the respective outputs pass through the circulators 202 and 203, The S monitor circuit 204 and the D monitor circuit 205 are supplied with the respective monitor circuit outputs through the RF cables 109 and 110,
It is applied to the SUM antenna 107 and the DIFF antenna 108. Each output is SUM antenna 107 and DI
The inquiry signal 111 is transmitted from the FF antenna 108. At the time of transmission, the S monitor circuit 204 and the D monitor circuit 205 monitor the output level of the SUM output s and the DIFF output d and the VSWR level of the SUM antenna 107 and the DIFF antenna 108 including the RF cables 109 and 110. At the same time, the respective levels are compared with the reference value in the transceiver 101 to generate the respective monitor signals ms and md. Each monitor signal m
s and md are supplied from the SUM monitor circuit 204 and the DIFF monitor circuit 205 to the signal processing unit 102, and the signal processing unit 102 checks the presence / absence of respective monitor signals ms and md to diagnose whether or not they are operating normally. hand,
The quality of the transmission operation of the transceiver is judged. On the other hand, the response signal 113 emitted from the aircraft 112 corresponding to the above-mentioned inquiry signal 111 is the SUM antenna 107 and DI.
The RF cable 1 is received by the FF antenna 108.
09 and 110, via the duplexer 104,
It is supplied to the receiving unit 105. The response signal 113 is amplified and detected by the receiving section 105 to become a processed signal n, and the processed signal n is transferred from the receiving section 105 to the signal processing section 10.
2, and the signal processing unit 102 performs necessary processing such as aircraft identification. After performing processing such as identification of the aircraft, a test signal st is supplied from the signal processing unit 102 to the reception self-test circuit 106 in order to confirm whether or not the reception operation of the transceiver is operating normally.
The reception self-test circuit 106 generates a pseudo reception signal rs corresponding to a response signal, and the pseudo reception signal r
s is supplied to the receiving unit 105. This pseudo received signal rs
Is monitored and amplified / detected by the receiving unit 105 to become a pseudo processed signal ns, which is supplied from the receiving unit 105 to the signal processing unit 102.
In 02, the presence / absence of this pseudo-processed signal ns is checked, and it is diagnosed whether or not it is operating normally, and the quality of the receiving operation of the transceiver is judged.

[0004]

In order to check the transmission operation status of the transceiver, the inquiry signal 111 as described above is used.
When transmitting from the SUM antenna 107 and the DIFF antenna 108, the transmission output level and the RF cable 109 in the S monitor circuit 204 and the D monitor circuit 205 are transmitted.
And SUM antenna 107 and DIFF including 110
The VSWR level of the antenna 108 is monitored, and each level is compared with the reference value in the transceiver 101 to check the quality of the transmission operation of the transceiver. However, in such a conventional transceiver, when an abnormality occurs in the transmission operation state, it may be due to the deterioration of VSWR of the antenna system and the reduction of the transmission output due to the malfunction of the antenna or the RF cable, or the inside of the transmission system of the transceiver. There is a problem that it is difficult to accurately determine whether the failure is due to a decrease in transmission output due to a unit malfunction.

On the other hand, when checking the receiving operation of the transceiver, after processing the response signal 111 in the transceiver 101 as described above, the receiving unit 105 monitors, amplifies and detects the pseudo reception signal rs, After the processed signal ns is generated, the quality of the receiving operation of the transceiver is checked by checking the signal. However, when checking the reception status of the transceiver, the SUM antenna 10
7 or the noise 114 is input from the DIFF antenna 108, the pseudo reception signal rs is masked by the noise 114 in the receiving unit 105, and the pseudo processing signal ns is not generated. Further, since the pseudo-processed signal ns is not supplied to the signal processing unit 102, it is determined that the receiving unit 105 is abnormal although the receiving unit 105 is operating normally in the reception operation state of the transceiver. . As a result, if an abnormality occurs in the inspection of the reception operation state of the transceiver, it may be due to a malfunction of the internal unit of the reception system of the transceiver, or the reception unit 105 may be operating normally despite the noise 114. Therefore, there is a problem that it is difficult to know accurately whether it is determined that the receiving section is abnormal.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve various problems at the time of checking the function of a conventional transceiver as described above, and transmits without causing unnecessary emission of radio waves. In order to achieve the above-mentioned object, it is an object of the present invention to provide a transceiver capable of inspecting an operating state and accurately inspecting a receiving state without being affected by noise input through an antenna. According to claim 1, a duplexer unit is provided between the antenna and the transmission / reception unit, the inquiry signal is transmitted, and in the transceiver for receiving the response signal from the aircraft returned in response to the inquiry signal, the antenna and the Insert a switch between the duplexer and
It is characterized in that the operating state of the transceiver is inspected by switching the switching device to the antenna side during normal operation and switching the switching device to the termination device side when checking the transceiver. In claim 2, claim 1
The transmitter / receiver described in (1) above is characterized in that it is configured so that it can be confirmed to which switch the switch is switched by using a switch with an indicator circuit capable of monitoring the switching state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a block diagram showing an embodiment of a transceiver to which the present invention is applied. The transceiver 1 transmits two interrogation signals 13 and receives two response signals 15, a SUM antenna 9 and a DIFF antenna 10, and
One of the SUM transmission output s and the DIFF output d is selected as the RF output tx, each output is supplied to the two antennas, and the response signal 15 is sent from the two antennas to the receiving unit 5. A duplexer unit 4 to be supplied, a transmission unit 3 and a reception unit 5 connected to the duplexer unit 4,
The receiving unit 5 includes a reception self-test circuit 6 for supplying a pseudo reception signal rs, and switching units 7 and 8 connected between the duplexer unit 4 and the SUM antenna 9 and the DIFF antenna 10, and the switching units. Terminators 25 and 26 connected to 7 and 8 respectively, and to the above-mentioned respective parts,
The signal processing unit 2 supplies a control signal to each unit.

That is, in the embodiment shown in FIG. 1, the S monitor circuit 204 and the D monitor circuit 205 of the duplexer unit 104 of the conventional transceiver, the SUM antenna 107 and the DI.
Switching devices 7 and 8 are inserted between the switching device 7 and the FF antenna 108, and one of the switching outputs of the switching devices 7 and 8 is connected to the SUM antenna 9 and the DIFF antenna 10 via the respective RF cables 11 and 12. The feature is that they are connected and the other is connected to terminators 25 and 26. The duplexer unit 4 sums the RF output tx supplied from the transmitting unit 3 as in the conventional duplexer unit 104.
An RF switch 20 for switching and outputting to either the output s or the DIFF output d, and two circulators 21 and 22 connected to the RF switch 20, and an S monitor circuit 23 connected to the circulators 21 and 22 are provided. And a D monitor circuit 24 section.

The transmitting / receiving operation of the transceiver 1 shown in this figure is as follows. The transmission / reception operation in the same portion as the operation shown in FIG. 2 is almost the same as that already described, and therefore the description thereof is omitted here, and the operation for checking the transmission and reception states according to the present invention is mainly described. Explained. That is, when checking the operating state of the transceiver 1 at the time of checking the transceiver, the switching signal sw is supplied from the signal processing unit 2 to the switching devices 7 and 8, and the switching devices 7 and 8 are terminated by the terminating devices 25 and 26.
Side.

In this state, the transmission trigger t is supplied from the signal processing unit 2 to the transmitting unit 3 as in the conventional transceiver.
The transmitter 3 generates a triple pulse train RF output tx as shown in FIG. This RF output tx is output by the RF switch 20 of the duplexer unit 4 as shown in FIG.
As shown in (b) and (c), the SUM transmission output s of the double pulse train and the DIFF output d of the single pulse are switched and output, and the respective outputs are passed through the circulators 21 and 22 to the S monitor circuit 23 and the D monitor. The output of each monitor circuit is supplied to the circuit 24 and applied to the terminators 25 and 26 via the switches 7 and 8.

As a result, the transceiver 1 has the switching devices 7 and 8
SUM output s in the S monitor circuit 23 and the D monitor circuit 24 in a state in which the switching output of S is connected to the terminator side.
And the output level of the DIFF output d and the level of the transmission VSWR are monitored, and the respective levels are monitored by the transceiver 1
The level is compared with the reference value in, and each monitor signal m
Generate s and md. Each monitor signal ms, md is S
From the monitor circuit 23 and the D monitor circuit 24 to the signal processing unit 2
The signal processing unit 2 checks the presence / absence of monitor signals ms and md at the time of checking the transmitter / receiver, diagnoses whether the transmitter / receiver is operating normally, and determines whether the transmitter / receiver is operating normally. .

Next, the test signal st is supplied from the signal processing section 1 to the reception self-test circuit 6, and in the reception self-test circuit 6, the pseudo reception signal r corresponding to the response signal is received.
s is generated, and the pseudo reception signal rs is supplied to the receiving unit 5. This pseudo reception signal rs is monitored and amplified / detected by the reception unit 5, becomes a pseudo processing signal ns, and this pseudo processing signal ns is supplied from the reception unit 5 to the signal processing unit 2 and the signal processing unit 2 checks the transceiver. The presence / absence of the pseudo-processed signal ns is checked, and it is diagnosed whether or not it is operating normally, and the quality of the receiving operation of the transceiver is judged.

As a result, if the operation check of the transmitter / receiver is normal at the time of checking the transmitter / receiver, the switching signal sw is supplied from the signal processing section 2 to the switchers 7 and 8, and the switchers 7 and 8 terminate the terminator 25 and. 26 side SUM antenna 9 and D
Switching to the IFF antenna 10 side.

In this state, the transceiver 1 operates normally as in the conventional case. When the transmission operation state of the transceiver 1 is checked at normal times, the transmission trigger t is supplied from the signal processing unit 2 to the transmission unit 3, and as shown in FIG. Generate an RF output tx.
This RF output tx is the RF switch 2 of the duplexer unit 4.
0 depending on the SUM output s shown in (b) and (c) of FIG.
And DIFF output d, and the respective outputs are output through the circulators 21 and 22 and the S monitor circuit 23.
And the D monitor circuit 24. The outputs of the respective monitor circuits are passed through the switches 7 and 8 to the RF cable 11
And 12 to be applied to the SUM antenna 9 and the DIFF antenna 10. The respective outputs are transmitted as the inquiry signal 13 from the SUM antenna 9 and the DIFF antenna 10.

At the time of this transmission, the transceiver 1 outputs the SUM output in the S monitor circuit 23 and the D monitor circuit 24 in the same manner as described above with the switching outputs of the switching devices 7 and 8 connected to the antenna and the RF cable. The output levels of the s and DIFF output d and the VSWR level of the antenna system including the RF cable are monitored, and the respective levels are compared with the reference value in the transceiver 1 to generate the respective monitor signals ms and md. To do. Each monitor signal m
s and md are supplied from the S monitor circuit 23 and the D monitor circuit 24 to the signal processing unit 2, and the signal processing unit 2 checks the presence or absence of the respective monitor signals ms and md in the normal state to determine whether or not they are operating normally. Is diagnosed and the quality of the transmission operation of the transceiver is judged.

Next, in response to the inquiry signal 13, the aircraft 14
The response signal 15 emitted from the SUM antennas 9 and D
RF cable 1 received by IFF antenna 10
1 and 12 and the switching devices 7 and 8 through the duplexer unit 4
And is supplied to the reception unit 5. This response signal 15 is amplified and detected by the receiving section 5 and becomes a processed signal n,
The processed signal n is supplied from the receiving unit 5 to the signal processing unit 2, and the signal processing unit 2 performs necessary processing such as aircraft identification.

After performing necessary processing such as identification of the aircraft, a test signal st is sent from the signal processing unit 2 to the receiving self-test circuit 6 in order to confirm whether the receiving operation of the transceiver is operating normally. The pseudo reception signal r supplied to the reception self-test circuit 6 corresponds to the response signal.
s is generated, and the pseudo reception signal rs is supplied to the receiving unit 5. The pseudo reception signal rs is monitored and amplified / detected by the reception unit 5 to become a pseudo processing signal ns. The pseudo processing signal ns is supplied from the reception unit 5 to the signal processing unit 2, and the signal processing unit 2 makes a pseudo at reception. The presence / absence of the processing signal ns is checked, and it is diagnosed whether or not it is operating normally, and the quality of the receiving operation of the transceiver is judged.

As a result, the transceiver 1 can check the quality of the transmission operation without transmitting the interrogation signal 13 from the SUM antenna 9 and the DIFF antenna 10 at the time of checking the transceiver, and the normal transmission operation of the transceiver 1 can be performed. If an abnormality occurs in the state, it may be due to the deterioration of the VSWR and the transmission output of the antenna system due to the malfunction of the SUM antenna 9 or the DIFF antenna 10 including the RF cables 11 and 12, or the transmission system internal unit of the transceiver 1. It is possible to accurately determine whether it is due to a decrease in transmission output due to the above problem.

When checking the transceiver, the switching device 7
Since noises 8 and 8 are switched to the terminators 25 and 26 side, the noise 16 causes the SUM antenna 9 or the DIFF.
Since the pseudo reception signal rs is not masked by the noise 16 in the receiving unit 5 without being input from the antenna 10, it is possible to reliably check the operation of the receiving unit 5 and check the quality of the receiving operation of the transceiver. . As a result, in the inspection of the reception operation of the normal transceiver by the test signal st after the required processing of the response signal, if the reception operation state is abnormal, it may be due to a malfunction of the internal unit of the reception system of the transceiver or the reception Due to noise 16 from the antenna, even though part 5 is operating normally,
It is possible to accurately determine whether the receiving unit 5 has become defective.

In the transceiver 1, the signal processing unit 2 controls the switching signal sw of the switches 7 and 8, the test signal st, the control signal to each unit necessary for the transmission / reception operation, and the like. The switches 7 and 8 are single-pole / double-throw switches with a normal switching control circuit. The changeover states of the changeover devices 7 and 8 can be confirmed by changing the changeover devices 7 and 8 to a changeover device with an indicator type circuit capable of monitoring the changeover condition and outputting a check signal of the changeover condition. That is,
A check signal k indicating whether the switching units 7 and 8 are switched to the antenna side or the terminating unit side is supplied from the switching units 7 and 8 to the signal processing unit 2, and the signal processing unit 2 performs this check. By checking the signal k and the switching timing at the time of checking the transceiver and at the time of normal operation, it is possible to accurately determine which of the switching devices 7 and 8 is switched in the transceiver 1 at the normal time and at the time of checking the transceiver. You can check.

[0021]

As described above, the transceiver of the present invention can check the transmission state of the transceiver without transmitting the inquiry signal from the antenna, and when an abnormality occurs in the transmission operation state of the normal transceiver, Accurately determine whether it is due to the deterioration of the VSWR of the antenna system and the reduction of the transmission output due to the malfunction of the antenna including the RF cable or the reduction of the transmission output due to the malfunction of the internal unit of the transmission system of the transceiver. You can

Further, in the transceiver of the present invention, if the receiving operation state of the transceiver by the test signal becomes abnormal after the required processing of the normal response signal, is it a malfunction of the internal unit of the receiving system of the transceiver, or Although the receiver of the transceiver is normal, it is possible to accurately determine whether the receiver is defective due to noise from the antenna.

Further, in the transceiver of the present invention, the switch is equipped with an indicator type circuit which can monitor the switching state and can also output a check signal for the switching. In addition, it is possible to accurately confirm that the switch is switched to the terminator side when checking the transceiver.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a transceiver according to the present invention.

FIG. 2 is a block diagram showing an example of a conventional transceiver.

FIG. 3 is a waveform showing the timing of RF transmission output.

[Explanation of symbols]

 1 ... Transceiver 2 ... Signal processing unit 3 ... Transmission unit 4 ... Duplexer unit 5 ... Reception unit 6 ... Reception self-test circuit 7, 8 ... Switcher 9 ... SUM antenna 10 ... DIFF antenna 11, 12 ... RF cable 13 ... Interrogation signal 14 ... Aircraft 15 ... Response signal 16 ... Noise 20 ... RF switch 21, 22, ... Circulator 23 ... S monitor circuit 24 ... D monitor circuit 25, 26 ... Terminator

Claims (2)

[Claims] 1. A transceiver for providing a duplexer between an antenna and a transceiver to transmit an inquiry signal and receive a response signal from an aircraft which is returned in response to the inquiry signal.
A switching device is inserted between the antenna and the duplexer unit, the switching device is switched to the antenna side during normal operation, and the switching device is switched to the termination device side when checking the transceiver to check the operating state of the transceiver. A transmitter / receiver characterized by being configured to. 2. The transceiver according to claim 1, wherein the switch is a switch with an indicator circuit capable of monitoring the switching state so that it can be confirmed to which side the switch is being switched. A transmitter / receiver characterized by