Antenna array scans left to right from the direction of flight in range ± 90°, scanning speed is at least 15 times per minute. Probing radio signals reemitted from air re objects droplets of moisture in the air or the earth's surface and return in the opposite direction to the antenna system of Weather Radar. 89).Īntenna system of Weather Radar emits radar signals propagating in space. Slotted antenna array can create a diagram direction of desired shape (Fig. In older types of Weather Radar such as antenna system used parabolic antenna that mechanically revolved around its axis in a particular sector. Diagram of direction of antenna moves so that the radar beam passed all the probing zone. Weather Radar principle of operationĪntenna system forms a narrow directional diagram in the horizontal plane and wide in the vertical. Weather Radar antenna is mounted on the nose part of aircraft under the fairing, made of radioparent material.įig. Antenna system designed for radiation and receiving of probing radar signals. Weather Radar transmitter generates radio probing signal at a frequency 9345 ± 15 MHц, which through antenna switch is supplied to the antenna system. Principle of operation of Weather Radar illustrates Fig. Principle of operation of Weather Radar based on the principle of action of primary radar. Modern Weather Radar also able to detect wind shear, which poses a real danger to aircraft and can lead to disaster. To solve navigation tasks Weather Radar can work in mode of browse of surface relief of the land. Modern Weather Radar can detect cloud structures at a distance of 200 km and area of storm activity and prevent entry of aircraft into them. You can click on the linked post above to find out more about this and the de-icing of aeroplanes to find out more about the methods to stop this problem, both in flight as well as on ground before take off.Weather Radar designed for probing of the airspace ahead of aircraft and inspection of the underlying earth's surface (Fig. IceĪnother one of the negative effects of going through adverse meteorological conditions is ice accumulation as we already discussed in our post ice is one of the biggest threats for any aeroplane. And, of course, all these checks mean loss of time and money for the airline involved. Can you see, then, how important radome and weather radar are? ThunderstormsĪs with hail, although aeroplanes are designed to endure lightening impact, when it actually happens, a more exhaustive service of the aeroplane is needed in order to check everything is as it should be. Hailįlying through strong hail can damage the outside of the fuselage. When there’s a strong headwind, fuel consumption can increase substantially or going through a pocket of turbulence will unnecessarily make the flight uncomfortable for passengers. This is why the onboard weather radar integrated beneath the radome is in charge of providing pilots with the required information so they can avoid adverse meteorology phenomena. Without a doubt, meteorology is an essential factor when planning a flight. Information obtained through the AWR is shown to pilots following a range of colours that relate to the intensity of the weather phenomenon: green for light precipitation and purple for severe precipitation. Options depend on the situation in which it is produced and their aim is to increase safety as much as possible.Īdditionally, more modern aeroplanes, such as Airbus A320Neo, allow automatic selection of flight level, making the indication even more accurate. When this happens in ascents or descents, other options available are to increase the ascent or slightly delay the point at which to start descent. In flight, once pilots have detected their route passes through a bad weather area, they will request ATCs to divert their route 5º, 10º or 15º with respect to their original direction. This function is of great help when making either an ascent or descent. Underneath a radome, the weather radar is connected to a directional aerial which allows for longitudinal scans to each side of the nose of the aeroplane, as well as vertical plane scans. Analysis of the Global Growth of Commercial Aviation.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |