JP2639367B2 - Aircraft stop position indication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an application of a VHF receiver used for guiding landing of an aircraft. The present invention
It is used to indicate the stop position when the aircraft stops on a taxiway connected to the runway.

[0002]

2. Description of the Related Art A landing guidance device that emits a guidance radio wave for an international standard instrument landing system (ILS) localizer is installed on a runway of a major airport in the world.
The aircraft landing on the runway is equipped with the above-mentioned international standard ILS localizer receiver to receive this guided radio wave.

Conventionally, aircraft travel on taxiways,
In order not to hinder the landing aircraft or the starter, the vehicle must wait on a predetermined taxiway before the runway. In order to inform the pilot of this waiting point, the stop position sign beside the taxiway and the display on the taxiway have been performed. In addition, a technique for guiding an aircraft on a taxiway and a runway is disclosed in, for example, JP-A-59-34.
As disclosed in Japanese Patent Application Publication No. 998, a technique is known in which a magnetic indicator made of magnet cement concrete is embedded in a taxiway and a runway to automatically guide the user to a predetermined position.

[0004]

Conventionally, when an aircraft waiting to take off stops at a predetermined stop position before the runway, the pilot of the aircraft visually checks the stop position display. Under meteorological conditions such as rainfall and heavy rain, the display may be overlooked or mistakenly viewed, leading to an improper entry into the runway, which poses a problem in terms of safety.

In addition, the method of burying and guiding magnet cement concrete in a taxiway requires a large-scale construction in an airport, requires a new display device to be additionally installed in an aircraft, and costs. There is also a problem with the mounting space.

The present invention has been made in view of such a background, and an apparatus and method capable of reducing human error by using radio waves supplied safely without adding new equipment. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION The present invention is characterized in that a reliable stop position is displayed on the cockpit and the occurrence of human error is prevented without increasing the cost of equipment.

That is, a first aspect of the present invention is a VHF radio wave receiver mounted on an aircraft, which is radiated on an extension of the center of the runway, and has two different left and right sides of the extension. An ILS localizer receiving apparatus for receiving a VHF radio wave which is AM-modulated at a frequency, further comprising means for numerically displaying a modulation depth difference (DDM) of the two different frequencies on a cockpit panel.

A second aspect of the present invention relates to an aircraft equipped with the ILS localizer receiving apparatus, wherein a stop position on a taxiway connected to a runway is determined by the modulation depth difference (DD).
M) It is characterized in that it is indicated by a value.

[0010]

The VLF radio wave radiated on the extension line of the center of the runway and AM-modulated at two different frequencies on the left and right sides of the extension line is received, and the aircraft provided with the ILS localizer receiver is provided to the aircraft. A modulation depth difference (DDM) value of two different frequencies is numerically displayed on a cockpit panel to indicate a stop position.

[0011] The apparatus of the present invention comprises an ILS localizer receiver installed on an extension of the runway center and an ILS receiver mounted on an aircraft. The localizer receiver that makes up the Instrument Landing System (ILS) is 108
Emit AM-modulated radio waves at 90 Hz and 150 Hz at a specified frequency of ~ 112 MHz. The pattern of this radio wave is 90 at the runway centerline (landing course).
Although the degree of modulation at 150 Hz is equal to that at 150 Hz, there is a difference in the degree of modulation as the distance from the center line increases. This radio wave is received by an ILS receiver mounted on an aircraft, and the modulation degree difference (DDM: Difference in depth of Mod) is received.
ulation), the deviation angle from the runway center line can be known. By stopping the aircraft at a point where the DDM value is set in advance so as not to affect the landing aircraft and the starter aircraft, it is possible to ensure that the designated position even in bad weather without adding new facilities Can be stopped at the same time.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the concept of an aircraft stop position indicating system using an ILS (instrument landing device) according to the present invention, FIG. 2 is a block diagram showing a configuration of an ILS localizer receiving device according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. 5 is a diagram showing a pattern of a radio wave radiated from the ILS localizer device in FIG.

As shown in FIG. 1, an ILS localizer device 1 according to an embodiment of the present invention is installed at the end of an approaching runway, generates a course line on the extension of the center line of the runway 2, and operates at 108 MHz to 112 MHz. Operate. The signal is 90H
z, amplitude modulation at 150 Hz, equal modulation when aircraft 3 or 4 is on course, 150H on right
On the left side, z generates a spatial signal such that the degree of modulation at 90 Hz is relatively high. The ILS localizer receiver mounted on aircraft 3 and 4 can derive the course deviation from the modulation depth difference (DDM) at the two different frequencies.

As shown in FIG. 2, an ILS localizer receiving apparatus according to the present invention comprises a VHF receiving circuit 11 for receiving an AM-modulated VHF radio wave via a localizer antenna 10, and an AM demodulation circuit for demodulating the received radio wave. 12
And 90 Hz filters 13 and 150 for separating the signal from the AM demodulation circuit 12 into 90 Hz and 150 Hz.
Hz filter 14, an arithmetic circuit 15 which receives outputs from the 90Hz filter 13 and the 150Hz filter 14 and calculates a modulation depth difference (DDM), and a value provided by the arithmetic circuit 15 provided on a cockpit panel and calculated. And a numerical display 16 for displaying. The stopping position on the taxiway 5 connecting to the runway 2 for the aircrafts 3 and 4 is indicated by a modulation depth difference (DDM) value.

The localizer antenna 10 is a horizontal polarization array. Like the monopulse angle measuring antenna, the localizer antenna 10 is a double feed type of a sum beam and a difference beam, has both smooth and high side ropes, and can distinguish left and right up to ± 35 degrees. it can. The sum beam is supplied with a double-frequency 20% modulated wave called a carrier, and the difference beam is supplied with a balanced modulated wave called a sideband, in which the sideband phases of 90 Hz and 150 Hz are inverted, and these are added in space. For this purpose, the ILS localizer receiver detects the amplitude of the received signal, rectifies and subtracts the modulation components of both frequencies, and can easily obtain a course shift. In the vicinity of the course, sufficient linearity is maintained, the amount of deviation is standardized at the approach end of the runway 2, the antenna aperture is selected according to the runway length, and the sideband power is adjusted.

Next, the operation of the embodiment of the present invention configured as described above will be described.

Radio waves emitted from the ILS localizer device 1 are received by the aircraft 3 and stopped in advance at a point where the DDM value at the standby position does not affect other aircraft 4.
As shown in FIG. 3, the radio wave emitted from the ILS localizer device 1 is AM-modulated at 90 Hz and 150 Hz at a designated frequency of 108 to 112 MHz, and the modulation degrees of 90 Hz and 150 Hz are equal on the center line of the runway 2. However, on the left and right sides, a difference occurs in the degree of modulation as the distance from the center line increases. On the right side of this radio wave, the 150 Hz component is larger than the 90 Hz component on the right side, and vice versa on the left side.

When the aircrafts 3 and 4 respectively receive the radio waves from the ILS localizer device 1, the difference between the DDM values depending on the positions is, for example, −0.155DD for the aircraft 3.
If it is M, the aircraft 4 is closer to the center line of the runway 2 than the aircraft 3, and the modulation depth difference between 90 Hz and 150 Hz is closer to 0DDM. Radio waves emitted from the ILS localizer device 1 as ground equipment are received by the VHF receiving circuit 11 of the ILS localizer receiving device mounted on the aircraft 3 and 4 and demodulated by the AM demodulating circuit 12.
The combined signal of 0 Hz and 150 Hz is a 90 Hz filter 1
90 Hz, separated by 3 and 150 Hz filters 14
The arithmetic circuit 15 calculates the amplitude of z, 150 Hz, and extracts an output signal proportional to the amplitude difference. This output signal causes the vertical pointer of the numerical display 16 to swing right and left. In order to improve the accuracy of the stop position, it is desirable that the numerical display 16 displays not only the vertical pointer but also the DDM value. The DDM value at a predetermined stop position on a number of taxiways in an airport can be added to information such as ATIS (Airfield Information Broadcasting Service) and notified to a pilot.

[0019]

As described above, according to the present invention, it is possible to reliably indicate the stop position even in bad weather by using radio waves safely supplied from the existing ILS localizer, and to overlook the display. It is possible to reduce human errors caused by mistakes and mistakes. In addition, since the ILS localizer device on the ground equipment and the ILS receiver on the aircraft are installed in most airports and aircrafts, there is little additional equipment, and thus the system is practical at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing the concept of an aircraft stop position indicating system using an ILS (instrument landing device) according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of an ILS localizer receiving apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram showing a pattern of a radio wave radiated from an ILS localizer device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ILS localizer apparatus 2 Runway 3, 4 Aircraft 5 Taxiway 10 Localizer antenna 11 VHF receiving circuit 12 AM demodulation circuit 13 90Hz filter 14 150Hz filter 15 Operation circuit 16 Numerical display

Claims (1)

(57) [Claims] 1. A VHF radio wave radiated on an extension of the center of a runway and AM-modulated at two different frequencies on the left and right sides of the extension, and received at two different frequencies.
Numerical display of the modulation depth difference (DDM) on the cockpit panel
Aircraft with ILS localizer receiver including means
Stop position on the taxiway connected to the runway
The aircraft stop position indicating method is indicated by the modulation depth difference (DDM) value .