JPH03111777A - Ground apparatus for microwave landing system - Google Patents

Abstract

PURPOSE:To make it possible to check a monitor system readily without complicated work with special devices by maintenance personnel by utilizing a transmitter in a reserve system or in an operating system, and outputting simulated abnormal signals for checking the monitor. CONSTITUTION:When a starting signal is outputted in a rest period of each ground apparatus, a controller 3 sends control signals to transmitters 1a and 1b in an operating system and a reserve system and an antenna control part 5 so that a normal radiowaves can be emitted at specified timings. The transmitters 1a and 1b are controlled so as to generate simulated abnormal signals exceeding an alarm limit during the rest time of the transmission. The signals are supplied to synthesizers 21-23 and a simulated load resistor 19 through an RF switch 2a and a directional coupler 20. The simulated abnormal signals sent to the synthesizers 21-23 are detected in RF detectors 7-9 and sent to a monitor 6. When the monitor system is normal, the simulated abnormal signals are detected, and an alarm is outputted. Thus the monitor system of the ground apparatus of a microwave landing system is confirmed. Then, parameters are sequentially confirmed, and the checking of the monitor system is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to a microwave landing system (formerly known as Crovave) used as a landing aid device for aircraft at airports, etc.
The present invention relates to ground equipment (Landing System (hereinafter referred to as 1MLS)), and particularly to a microwave landing system ground equipment with a function of checking the operation of a monitor system.

[Prior Art] MLS ground equipment is a conventional instrument landing system (I L
S: Instrument Land Sy
(Stem) is being put into practical use as a landing aid system that provides azimuth, altitude and angle information as well as various data to aircraft about to approach and land at an airport.

This MLS ground equipment is described in detail in, for example, "Avionics Equipment: Edited by Minoru Okada, Nikkan Kogyo Shimbun Sha Series."

The MLS ground equipment has the function of constantly monitoring each major parameter of the MLS, and at the same time has the function of checking whether this monitor is operating normally. However, this function only checks the monitor processing section that processes the process after the high frequency signal is converted into an audio signal, and it only checks the monitor processing section that processes the high frequency signal radiated from the antenna and the section that detects this signal and converts it into an audio signal. It is not possible to check the RF detection unit, etc. that performs the conversion.

Conventionally, this type of check has been carried out by combining a general-purpose measuring instrument separate from the MLS ground equipment, or by preparing a separate testing device that generates a pseudo abnormal signal that exceeds a predetermined alarm limit. Using these, I tried to periodically test each parameter.

FIG. 3 is a block diagram showing the configuration of a conventional MLS ground device of this type.

An active transmitter 1a that generates a high frequency signal and a backup transmitter 1b are connected via an RF switch 2a. The RF switch 2a is provided to switch the transmitter connected to the antenna system between an active system and a standby system, and one output is given to the RF switch 2b,
The other output is connected to a pseudo load resistor 19. R
The F switch 2b transmits the high frequency signal selected by the RF switch 2a to the power divider 4 and the sector guidance antenna 1.
This is a changeover switch that transmits information to either one of 8.

Power divider 4 connects antennas 15 . Distribute high frequency power to IE3.17. The antenna control unit 5 generates a phase shift control signal and controls the phase shifters 101, 102, and 103 with the signal, respectively, so that the radio waves radiated from the antennas 15, 16, and 17 cover a preset spatial range. Control to scan.

This system also includes the antenna 15°18.1
Integral manifolds 10, 11 and field monitors 12 are provided for picking up radio waves radiated from the antenna 7 and the sector guidance antenna 18. The high frequency signals picked up by these integral manifolds 10 and 11 and field monitor 12 are
They are applied to RF detectors 7, 8.9, respectively. These R
The F detectors 7, 8.9 detect the received high frequency signals, convert them into audio signals, and send the audio signals to the monitor 8. The monitor 6 has a function of monitoring various required parameters in order to constantly monitor whether or not the MLS ground equipment is operating normally based on the outputs of these RF detectors 7°8.9. There is.

The controller 3 comprehensively controls the MLS ground equipment. That is, in the case of normal operation, the controller 3 controls the active transmitter 1a1 or the backup transmitter 1b to output a preset high frequency signal, and switches the output to the RF switches 2a and 2b. transmitter 1a or 1
In addition to controlling whether to send the high frequency signal from b to the power distribution heat 4 or the sector guidance antenna 18,
The antenna control unit 5 performs control to output the phase shift control signal, and further receives the monitoring information signal from the monitor 6 and performs the various controls while checking the information signal.

Note that this system is provided with a tester 13 that is used when checking the monitor system.

Next, an explanation will be given of the operation when checking the monitor system using the conventional MLS ground equipment configured as described above.

When performing a check, first, as shown in FIG. 3, the input cable of the RF detector 7.8.9 is disconnected, and the signal from the tester 13 is input. Although the content and waveform of the signal from the tester 13 differs depending on the parameter to be confirmed, here, as an example, the content and waveform of the ML8 angle information signal as shown in FIG. 2 will be explained. If the MLS ground equipment is normal, a signal 301 showing an example of a received waveform representing ML8 angle information in FIG. 2 is picked up by the integral manifold 10 in FIG. 3.

When checking the monitor function, the tester 13 outputs a pseudo abnormal signal as shown at 302 in FIG. If the angle information monitoring system is operating normally, this signal will cause the monitor 6 to
An abnormality is detected and an alarm is issued. Similar operations are performed for each parameter to complete this check.

In the above check, whether the detected signal is normal or abnormal is determined by the time interval T+Δt+δt of the waveform of the detected signal as shown in FIG.
The determination is made based on whether the time width is between the upper limit time width 201 and the lower limit time width 202 of the scanning beam reception signal during normal operation shown in FIG.

[Problem to be solved by the invention] However, in the above-mentioned conventional MLS ground equipment, the MLS
In addition to the LS ground equipment and general-purpose measuring equipment, a separate testing device is required, making the test large-scale and requiring maintenance personnel to change cable connections.Furthermore, the work is complex and requires a lot of skill. It had the disadvantage of being necessary.

The present invention has been made in view of these problems, and it is possible to extremely easily operate a monitoring system without requiring any special equipment such as a general-purpose measuring instrument or tester, and without requiring complicated work by maintenance personnel. The purpose is to provide a microwave landing system ground equipment that can be checked.

[Means for Solving the Problems] A microwave landing system ground device according to the present invention includes an operational transmitter and a standby transmitter that generate transmission signals,
An antenna that radiates transmission signals from these transmitters, an antenna control section that controls the antenna, a pickup means that picks up the signal radiated from the antenna, and a detector that detects the signal from the pickup means; The microwave landing system ground equipment includes a monitor that receives the detected signal and outputs an alarm if there is an abnormality in a predetermined parameter included in the detected signal, the operating system transmitter and the standby system transmitter. At least one of the transmitters receives a predetermined control signal and outputs a pseudo abnormal signal during its rest time, and the detector detects at least a part of the output pseudo abnormal signal. It is characterized by

[Operations] According to the present invention, a pseudo-abnormal signal for monitor check is output using a standby or active transmitter installed in the device, which eliminates the test that was previously necessary. There is no need to prepare separate check equipment such as general-purpose measuring instruments or general-purpose measuring instruments, and there is no need for complex work such as changing cable connections by skilled maintenance personnel. can be checked.

[Embodiments] Hereinafter, embodiments of the present invention will be described based on the attached drawings.

FIG. 1 is a block diagram showing the configuration of a microwave landing system ground device according to an embodiment of the present invention.

Note that in FIG. 1, the same parts as in FIG. 3 are given the same reference numerals, and explanations of overlapping parts are omitted.

The apparatus shown in FIG. 1 differs from the conventional apparatus shown in FIG. 3 in that it includes an integral manifold, a field monitor 12, and each RF detector 7.

Combiners 21, 22, and 23 are inserted between the RF switch 2a and the pseudo load resistor 19, respectively, and a directional coupling is provided between the output terminal of the RF switch 2a on the pseudo load resistor 19 side and the pseudo load resistor 19. The point is that the high frequency power distributed by the directional coupler 20 is supplied to the combiners 21, 22, and 23 by inserting the directional coupler 20. Additionally, in addition to the conventional functions described above, the controller 30 also controls the transmission suspension period, the standby transmitter 1a
Alternatively, 1b has a function of generating a pseudo abnormal signal generation control signal.

Next, the operation of the MLS ground equipment according to this embodiment configured as described above will be explained.

Azimuth angle information, elevation angle information, and various data are signals transmitted in a time-division manner, and azimuth angle information and various data are transmitted from the MLS azimuth guidance ground device, and elevation angle information is transmitted from the MLS azimuth guidance ground device.
Since the information is transmitted from the LS altitude guidance ground equipment, each ground equipment has an idle period during which it does not transmit. Monitor system checks are performed as follows during this pause period. Here, for convenience, checking of the angle information monitor system will be explained, but it is possible to check other parameters by the same operation, only the signal waveform is different.

When checking the monitor system, first, a start signal is outputted to the control section 30 from, for example, not shown means during the pause period. In response to this, the controller 30 sends a control signal to the active transmitter 1a or 1b and the antenna control unit 5, and at the same time sends a control signal to the active transmitter 1a or 1b and the antenna controller 5, so that the antenna can emit normal radio waves at a predetermined timing. The transmitter 1b or the active transmitter 1a is controlled to generate a pseudo-abnormal signal that exceeds the alarm limit during the transmission down time of the transmitter 1a or 1b. This signal is the RF switch 2
a and the directional coupler 20, some of the power is sent to the combiner 2.
1, 22, and 23, the remaining power is also supplied to the pseudo load resistor 19. The pseudo abnormal signal sent to the combiner 21, 22, 23 is sent to the RF
The wave is detected by the wave detector 7°8.9 and sent to the monitor 6.

If the monitor system is normal, the monitor 6 detects a pseudo-abnormal signal and outputs an alarm. As a result, the operation of the monitor system of the MLS ground equipment is confirmed.

Subsequently, each parameter is sequentially confirmed in the same manner, and the monitor system check is completed.

[Effects of the Invention] As explained above, according to the present invention, a pseudo-abnormality signal for monitor check is output by using the standby or active transmitter installed in the device. Therefore, there is no need to prepare separate check equipment such as testing equipment or general-purpose measuring equipment, which was required in the past, and there is no need for complex work such as changing cable connections by skilled maintenance personnel. Therefore, the effect is that the monitor system can be checked extremely easily.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a microwave landing system ground device according to an embodiment of the present invention, and Fig. 2 is an MLS in the same device.
A waveform diagram representing a received signal of angle information, and FIG. 3 is a block diagram of a conventional microwave landing system ground device. 1 a, 1 b; transmitter, 2a+ 2b; RF
Switch, 3, 30; Controller, 4; Power divider, 5; Antenna control section, 6; Monitor, 7 to 9; RF detector, 1
0, 11; Integral manifold, 12; Field monitor, 13; Test device, 15 to 17; Antenna, 1
8; Sector guidance antenna, 19; Pseudo load resistor, 20; Directional coupler, 21 to 23; Combiner, 101
~103; Phase shifter

Claims (1)

[Claims] (1) An active transmitter and a standby transmitter that generate transmission signals, an antenna that radiates transmission signals from these transmitters, an antenna control unit that controls this antenna, and radiated signals from the antenna. A pickup means for picking up a signal, a detector for detecting a signal from the pickup means, and a monitor for receiving the detected signal and outputting an alarm if there is an abnormality in a predetermined parameter included in the signal. In the microwave landing system ground equipment having the above, at least one of the active system transmitter and the standby system transmitter receives a predetermined control signal and outputs a pseudo abnormal signal during its rest time, and the above-mentioned A ground device for a microwave landing system, characterized in that the detector detects at least a part of the outputted pseudo-abnormal signal.