![]() ![]() At high altitudes above 12,000 m Weather Radar allows to identify the storm area and shape of the city at a distance of 550 km.Type of radar system Airborne pulse-Doppler radar antennaĪ pulse-Doppler radar is a radar system that determines the range to a target using pulse-timing techniques, and uses the Doppler effect of the returned signal to determine the target object's velocity. This prevents interference and increase the clarity, consider the vertical structure of clouds and when antenna is tilted down to the ground - using Weather Radar for inspection earth relief in accordance with the needs of navigation. You can also set the antenna tilt angle in limits ± 15 ° from the horizontal axis of aircraft. To reduce the time of inspection pilot with remote control can reduce the area of view to ± 45 °. It uses the information about the angles of roll and pitch from INS. In the conditions of maneuvering Weather Radar stabilizes the beam of antenna in a horizontal position. Darker (red) zone corresponds to more dangerous meteoformations. An example of an image on the indicator of cloudiness straight ahead of flight is shown in Fig. As a result, points create on the screen sketch of meteo formation in the direction of flight. In the case of turbulence measurements provided brown, for strong turbulence - purple. With the increase level of the reflected signal colors are placed so: black, green, yellow, red. On the screen of indicator levels of reflecting signal represents as points of different colors. The information scaled depending on the set on the remote control range of distance. 90).Įvaluator handles the information and gives measurement results in system of display. If there is no system of electronic indication, to the meteo radar indicator includes its own (Fig. For this computer unit contains a standard digital output for transferring images in digital form (for example by ARINC 708). ![]() If at board of aircraft available electronic display system for output of meteorological information using its indicators. Evaluator with different algorithms fixing change of probing signal parameters and their values evaluates physical properties of objects, from which he was reradiated. Evaluator estimates by travel time of the probe radio signal to the air object and back distanceIn addition, during the probing signal reradiation from objects changing certain parameters of the signal. Through the antenna switch recieved by antenna signal is passed to a receiver that handles call-out. In the range of scanning weather radar produces many separate radio beams (to 1024), each beam is broken during the reception on many placed one by one points (the default - 256 points maximum - 512) for each point measured level of the reflected signal indicates the presence and density of clouds and turbulence. 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. Weather Radar designed for probing of the airspace ahead of aircraft and inspection of the underlying earth's surface (Fig. ![]()
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