DE2652489A1 - Electronic aircraft proximity warning system - has single frequency alternating cycle transceiver with altitude comparator rejecting signals from aircraft outside specified height range - Google Patents

Abstract

The electronic air-to-air aircraft proximity warning equipment has a single frequency transmitter-receiver operating in a frequency range not normally used for aircraft. Using a multi-vibrator, it is made to transmit, and receive alternately in 1/2-second cycles. The signal transmitted may be modulated by three recognition notes. The effective range is up to 6 nautical miles, all round, the warning given being visual and audible. An altitude comparator rejects signals originating more than 150 m above or below the aircraft, and visually indicates relative altitude of notified aircraft.

Description

ELECTRONIC AIRCRAFT APPROXIMATION TO

SECURING AIR TRAFFIC The invention relates to flight collision warning devices, which without the aid of ground control centers, any unintentional approach to the Aircraft among each other, indicated to the flight crew in good time, by means of a warning tone and screen display.

Recent serious flight collisions make it clear that that the current air traffic control "air - ground - air" by extremely unfavorable interaction complicated technology and human operation, has fatal loopholes.

With the expansion of jet traffic aviation, optical perception is less the flight crew lagged far behind, allowing the detection of fast-flying objects Is a matter of luck.

A comprehensive and seamless introduction of equipment in aviation would bring the following advantages: 1) saving human life and valuable material assets 2) Secured close flight movements through path detection, altitude and distance information with all display devices, even in cloudy and night flights 3) Less strenuous Visual recognition efforts of the flight crew 4) New naming of air traffic control would be given a) dismantling of unnecessarily large air traffic control rooms b) smaller flight distances, higher flight density c) Sports aviation, military aviation and scheduled service can all Altitudes are mixed, without flight bans d) Maximum freedom of movement regarding altitude and course.

EXPLANATION OF THE PRINCIPLE OF OPERATION Every aircraft receives an electronically constructed CONSTANTLY MOVING 1 <ONTROLLZONE "In the event of an unintentional entry into the security area of another air traffic participant, a warning is given automatically and both pilots involved are warned at the same time.

The main advantage is that the achievement of the ELECTRONIC RESPONSE THRESHOLD is far ahead of the optical detection possibility, especially since the rear areas, which are difficult to see, are fully included.

After a warning signal has sounded, both flight crews have immediately cease all other activities and, through intensive attention, the airspace Search in the flight plane for the approaching object in order to make an evasive maneuver if necessary to initiate according to the escape rules.

Depending on the flight speed and approach direction, this remains 5 - 25 sec. Time.

ELECTRONICS WORKING METHOD Each device consists of a transmitter - receiver unit, operated on SINGLE FREQUENCY outside of the aeronautical radio ranges. The transmitter radiates a weak high-frequency field in a circle, which is optionally modulated with the three detection warning tones. To ensure that the receiver does not receive its own warning signal during the transmission, a transmission / reception pause switch is provided, operated via a multivibrator. The switching frequency is approx. 0.5 Hz.

To prevent useful signals from being deleted with a simultaneous clock phase, an AUTOMATIC CLOCK SYNCHRONISATION is provided, which is connected after the IF stage and takes effect when the device response threshold is reached.

Signal deletion with randomly in-phase clocking without synchronization Signal transmission with out-of-phase timing after the onset of SYNCHRONIZATION WORKING METHOD OF THE BAROMETRIC HUGEBAND COMPARISON According to Fig. 2, the vertical high-frequency radiation of an antenna dipole is roughly elliptical. As a result, aircraft would be displayed in flight altitude stratifications, which are of no interest for flight collisions. Therefore, by means of a barometer-electronic measure (altimeter principle), the height range of the elliptical radiation that is too high and too low is recorded in the receiver, but not displayed. Only the entry of an aircraft into the hatched area + 150 m in relation to its own flight level is indicated by a warning tone and, in the case of screen devices, the altitude difference in meters is indicated by light-emitting diodes.

The altitude band pulses sent by the located aircraft are compared with the device's own altimeter. Settings of the altimeter are inevitably not required, since the air pressure for comparison purposes is always the same in the collision area.

System advantages: The location signal also contains the flight altitude information Your own and other people's altitude changes are always related to your own flight level displayed, this enables constant monitoring of the flight altitude difference.

Example meaning: | + j351 located device flies 1 meter higher Technical data: Device types G 001 - 5 Operating voltage 14/28 / DC Operating frequency UHF output max. 800 mW Sound pulse modulation Modulation frequency 4000 Hz 2000 Hz 800 Hz Response range 2 - 6 NM Weight of the warning device approx. 1000 r.

Weight of the display device approx. 2500 r.

2-part display unit Installation location: Instrument panel, below the front window

Claims (6)

Claims 1)) Electronic aircraft proximity detection, as On-board built-in warning and detection device for the timely display of a unwanted flight approach, consisting of a transceiver, operated on SINGLE FREQUENCY, CHARACTERIZED in that the omnidirectional and circular Propagation of a high-frequency field (Fig. 1) within a radius of a maximum of 6 nautical tables Miles, in the receiver of the other aircraft an audible and visual warning Display generated. 2) proximity detection according to claim 1), characterized in that The transmitter and receiver are automatically switched on or off for 0.5 seconds (Fig. 4). 3) proximity detection according to claim 1) and 2), characterized in that that when locating begins, a clock synchronization ensures that the transmitter and Receivers are always switched on alternately (never at the same time) and so for one ensure perfect signal transmission (Fig 5). 4) proximity detection according to claim 1 - 3, characterized in that by means of a barometric altitude band comparison, according to the altimeter principle (Fig 3), only aircraft in flight altitude layers of + - 150 meters are displayed (Fig 2). 5) proximity detection according to claim 1) - 4), characterized in that that the transmitter modulation receives acoustically perceptible information content, for Facilitation of object detection. 6) proximity detection according to claim 1 - 5, characterized in that that the display device shows the direction according to the well-known radio compass principle takes place that the approach distance according to the well-known S meter in the screen device Field strength measurement is displayed (Wiehe block diagram Fig. 9) 7) Approach location with screen device according to claims 1 - 6, characterized in that by the device's own barometric altitude comparison the flight altitude differences with reference to your own Flight level are displayed (Fig 7).