JPS60135875A - Ground station device for sailing assisting radio system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to ground station equipment for navigational aid radio systems. The device according to the invention is used, for example, in navigation aid radio systems for aircraft.

Regarding the prior art and the problems to be solved by the invention Regarding ground station devices for navigational aid radio systems, see, for example, Gee Hofron's papers rVOR and yf5VOn.
J, Elektrissie Snaharitenvesen, 50th
Vol. 4, 1975, pages 252 to 262. This paper describes only VOR and DVOR ground station equipment. Another ground station device is
This is a well-known NDBjll upper station device.

If such a ground station is not extremely remote from the maintenance center, the ground station can communicate with the maintenance center by telephone. In this way, a failure notification (failure message) can be transmitted from the ground station to the maintenance center. Fault notifications can also be sent to a maintenance center via a wireless link. However, such a solution becomes excessively expensive when the distance to the nearest maintenance center is extremely large. This is often the case with ground stations used for route-based air pressure. Many such ground stations are located in deserts or jungles.

Ground stations located at such locations are visited at regular intervals by maintenance personnel who review fault notifications stored within the ground station.

This technique has a significant disadvantage in that the failure is not known prior to such a visit. In this technique,
Failures may not be removed immediately because the necessary materials are not available.

Furthermore, this technique requires significant expense.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an improved ground station device for a navigation aid radio system.

Means for Solving Problems and Operation The present invention includes a signal emitting means, a fault detection facility for detecting a fault in a ground station for a navigation aid system, and a signal to be emitted from the ground station as a fault message. and additional modulation equipment modulating with at least one of the status messages;
A ground station device for a navigation aid radio system is provided.

According to the ground station device of the present invention, the above-mentioned and other disadvantages of the prior art are overcome by generating signals modulated by fault or status messages.

Thanks to the new solution according to the invention, faults and conditions can be signaled in a simple manner even if the nearest maintenance center is located at a very large distance. If fault messages can be transmitted over telephone lines or radio links, it is not necessary to install such equipment specifically for this purpose.

The signals emitted by the earth station are used to transmit the messages, ie no additional transmitting equipment is required. This is particularly important if the power source for the station is a solar array, since in this case electrical energy is extremely insufficient.

Kamishi NDB t or VOR (DVOR) ground station has audio f
-W If the ground station is located near a ground station that does not have a voice channel, the ground station that has a voice channel can also transmit failure messages of other ground stations. This is because messages can be sent to ground stations that have a channel.

EXAMPLE For a better understanding of the present invention, first, a conventional VO
The R ground station is described with the help of FIG.

The transmitter S of the VOR ground station comprises a main oscillator 8 , a carrier transmitter 7 and an electronic goniometer 9 . Modulator 6
provides a voltage U(mod) that modulates the carrier transmitter 7. In the modulated signal U (mod ), speech, identification and 9960 HS carriers frequency modulated by a 30 Hz reference signal are additionally combined. The main switches and switches are controlled by a control logic circuit 4. The main switch connects the modulator 6 to the power supply 2 . A battery 1 is provided as an emergency power source, and the voltage of the battery is applied to the control logic circuit 4 and the main switch 5. The signal generated by the transmitter S is fed to an antenna system 10 .

The antenna system 10 is in the form of a turnstile.
s), including antennas and unidirectional antennas. The turnstile antenna is fed by a goniometer 9 and radiates a rotating figure-eight A-turn, and the unidirectional antenna is fed by a carrier transmitter 7. Thus, speech information is radiated by unidirectional arm turns.

It receives the signal radiated by the dipole 11iVOR ground station in the radiation field and supplies the received signal to the monitoring device 3. The monitoring device is, in particular, a radiated VOR
Monitoring whether the navigation signal has predetermined parameters and monitoring the operation of the transmitter.

If the emitted VOR signal is
If the criterion of AO) is not met, the t control logic unit
Shut down the OR ground station, or switch to a backup transmitter if the VOR ground station is equipped with duplicate transmitters.

Apart from faults that result in the equipment being immediately shut down or switched over, any deviations of other monitored values from the required values are detected and stored. Conventional VO
At the R ground station, this accumulated information is transmitted to the telephone Ivi!, as mentioned in the opening part of this specification. Or it is sent to a maintenance center at regular time intervals through a wireless transmission path.

The new ground station according to the invention operates as follows.

Radiation field/? In addition to parameters, the general condition of the ground station is monitored. This includes the condition of the generator, the temperature at the ground station, and whether there has been an intrusion into the ground station.
Includes monitoring of One output signal is emitted for each monitored function, for example a signal whose level depends on the result of the monitoring. Information is accumulated about events or faults that have existed for a short time or have existed only once (a short period of rapid temperature rise, or an intrusion). The device compares the actual value with the required value at regular intervals, for example once every 2 to 10 minutes, or upon the occurrence of a specific event, and issues alarm messages and other deviations from the specified conditions. Record.

This information can be converted by electronic means into an audio signal, with which the transmitter is modulated. The information emitted in this way is transmitted to a commercially available airborne VOR.
Facilities are busy and can be received and played. The aircraft operator receiving this message transmits this information to the nearest maintenance center. It is also possible for the aircraft to fly over the ground station and receive messages at regular intervals under the direction of the maintenance center.

This message is sent in encoded form and is K
Therefore, the pilot cannot receive the message as a clear text. the device selects a codeword from the memory according to the information to be transmitted.

Examples of code words and their meanings are as follows.

alfa 6: alfa with standby transmitter in shutdown state
5: The main transmitter is cut off Brama O1: The signal transmission of the azimuth monitor 1 is malfunctioning Brama O2: The signal transmission of the 30Hz monitor 1 is malfunctioning Charlie 1: There is an intrusion into the ground station dslt
a' 4: The slack when the fuel level is too low.

If the pilot says ``V-0-R check, alpha, five (
alpha flv*
rlyone), delta fore (delta f
By receiving the announcement ``our)J'' and transmitting this information to the maintenance center, it is possible to determine which failure has occurred at that location. If the VOR ground station is operating normally, an announcement is sent that says "V-OU inspection passed".

If a ground station fails as a result of a defect, the defect is detected and stored. After a failure of the equipment, only voice messages are sent in a manner known per se. For this purpose, the last stage of the main transmitter and the standby transmitter are alternately activated for short periods of time at regular intervals by means of a monitoring device, at the end of the previously operating installation. The stored state is sent. It should be ensured that the emitted signal is "unflyable" for a short operating state period, because if the emitted navigational signal is evaluated, it will not be possible to mis-navigate. This is because the equipment has defects that may lead to If the reference signal is interrupted, the emitted navigation signal becomes a "do not fly" signal.

A ground station device for a navigation aid radio system as an embodiment of the present invention will be described below with reference to FIG.

For a VOR ground station, which will be explained with the help of FIGS. 1i and 12, the main switch, switch 5, modulator 6, control logic 4, monitor 3 and battery l are shown in FIG. Device 3
0, which monitors various operating conditions and generates signals containing fault and status messages, are connected to a monitor 3, a control logic circuit 4, and a modulator 6. When the transmitter is turned on and transmits only message signals, the emitted signal is ``non-flyable'' as described above.
It has to be a signal. This is accomplished by turning off one reference signal as described above. In the ground station device according to the present invention, the reference signal is superimposed on other signals as described later.

It must therefore be ensured that if the equipment is in a fault condition, the reference signal will no longer be superimposed on such other signals. This prevents the transmission of the reference signal while the transmitter is activated for transmitting status and fault messages by the device 30 through the control logic 4, i.e. while the installation is operating in emergency mode. This is laughed at by K.

In the ground station device according to the invention, the following signals are supplied to the device 30, but the selection of the following signals is arbitrary.

(i) The output signal of the monitor 3, which in FIG. 1 is applied to Sl.

Gi) Signal S2゜QiD indicating the temperature of the carrier wave transmitter 7
Signal S3゜4 indicating the status of the storage battery 1 Signal S4゜0 indicating the status of the generator 24 that serves as a power source for the ground station Signal S5゜~ indicating how much fuel remains in the tank of the generator 24 Device 26 In the device 30, the signals S1 to 8n are applied to the interface 23. When further conditions are to be monitored, this interface is supplied with correspondingly more status indication signals.

This means, for example, that the VOR ground station is connected to other navigational aids,
For example, this is true when the DME and NDB are co-located, and although the DME and NDB do not have their own audio channels, their status should be monitored as well. The interface converts the level of the supplied signal to a level suitable for further processing at the device 30. Additionally, the interface provides electrical isolation between the individual sensors and other devices in the device 30 and converts input signals applied in parallel form into serial data packets with the aid of a multiplexer or the like. . This serial data packet is provided to a calculation and storage device 22. A storage device stores the required value of the signal to be monitored. The computing device samples the input signal at regular intervals and compares the sampled value to the requested value. After the occurrence of a special event, for example a transmitter outage, the sampling time point can be forced to depend on the occurrence of this special event. Depending on the result of this comparison, the computing device identifies individual faults or generates a signal indicating that the equipment is operating correctly. These signals are fed to an audio processing circuit 21, which includes a commercially available audio processor. This voice processor stores 255 words. Depending on the input signal, a predetermined word is selected from the memory. The speed and pitch of the voice is adapted to the requirements of reception on the aircraft.

To prevent the air aid signal from being influenced by this audio signal, an audio compressor is provided which is connected to the audio processing circuit to limit the volume range of the generated audio signal.

The output signal of the audio processing circuit is applied to an adder 20. The adder also includes an identification signal, a reference signal, and! The output signal of Micro7 ON (audio channel) is supplied. Through the audio channel, the adder is supplied with several signals, for example signals containing weather data. The adder sums the applied signals and generates one signal from it K, or the signal generated is the modulation signal for the modulator 6. Overmodulation is avoided by using special circuits.

When the output signal of the monitor indicates that the ground station is in a faulty state, a switch to emergency shade occurs; in this mode, status information concluding that the ground station 9 is defective is stored. All other messages are sent to device 30 at the same time.
are sampled, compared, and arbitrarily processed as described above.

Effects of the Invention According to the present invention, it is possible to generate a signal modulated by a fault message or a status message, so that faults and conditions can be detected easily even when the nearest maintenance center is located at a very large distance. An improved ground station device for a navigational aid radio system is provided that can be signaled in a manner that is advantageous.

[Brief explanation of drawings]

Figure 1 shows the new VOR required for understanding the present invention.
FIG. 2 is a block diagram showing a conventional VOR ground station. DESCRIPTION OF SYMBOLS 1...Storage battery, 3...Monitoring device, 4...Control logic circuit, 5...Main switch, 6...Modulator, 7...
Carrier wave transmitter, 20... Adder, 21... Audio processing circuit, 22... Computing device and storage device, 23...
Interface, 24... Generator, 25... Fuel (
Detection unit), 26...Trespass (detection unit), 30...
Operating condition monitoring equipment.

Claims (1)

[Claims] 1. A signal emitting means, a fault detection facility for detecting a fault in a ground station for a navigation aid system, and a signal to be emitted from the ground station as at least one of a fault message and a status message. ground station equipment for a navigation aid radio system, comprising: additional modulation equipment for modulating the radio signal; 2. The device according to claim 1, wherein the message is modulated as speech on the signal to be emitted. 3. The message is sent at regular time intervals. ! The device described in Ji. 4. Device according to claim 1, wherein the message is modulated in coded form on the signal to be emitted. 5. The apparatus of claim 4, wherein the messages are sent at regular time intervals.