KR101435583B1 - Icing Detection System and Detection Method - Google Patents

Abstract

The present invention relates to an icing detection system and a detection method. The icing detection system includes a geostationary meteorological satellite, a satellite signal receiver, and an icing detection device and determines the occurrence of icing and icing intensity by using the brightness temperature of an infrared channel and cloud phase information detected from the meteorological satellite.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an icing detection system,

The present invention relates to an icing detection system and a detection method, and more particularly, to an icing detection system and an icing detection method that continuously detect icing using cloud image data and boundary value detection of brightness temperature detected by geostationary- .

Icing refers to the formation of an ice film by colliding supercooled water droplets or cloud particles on aircraft wings or fuselage exposed to the atmosphere at 0 ° C or lower. It is mainly caused by the airplane being circulated to the mooring station or flying in the air, and is influenced by the surrounding temperature, the size and quantity of subcooling water, the speed of the aircraft or wind, and the size and shape of the aircraft wing section.

When icing occurs on the aircraft, the wing surface becomes uneven and the air flow around the wing is disturbed, thereby increasing the drag force of the aircraft and reducing the lift as well as affecting the operation of the aircraft by degrading the function of the aircraft engine or antenna . Therefore, forecasting of icing is required when planning long haul flights.

In many countries, including the United States, cloud computing is calculated hourly by integrating cloud output from satellites, numerical models, radar, aircraft pilot observations and ground observations.

And in Europe, we are monitoring icing using weather satellites. However, it is difficult to apply these aerodynamic parameters directly to Korea because the forecasts are made only for the countries according to the characteristics of each country. In addition, intermittent information according to the pilot's observation report has difficulty in monitoring icing continuously and preventing accidents caused by icing.

A more accurate icing detection technique is required because the icing output is difficult to use icing detection by using icing output modeling results, rather than direct calculation, or by icing reports that are directly observed by ground and airplane pilots.

The present invention can grasp the actual situation of icing using the MTSAT and COMS satellite data provided by the National Weather Satellite Center and provide it directly to an aircraft.

According to an aspect of the present invention, there is provided a geostationary meteorological satellite including a plurality of infrared ray observation sensors and outputting a brightness temperature value through a plurality of infrared channels; A satellite signal receiver for receiving the plurality of infrared channel output values from the geostationary-satellite meteorological satellite; Determining whether or not the infrared ray channel is in a mixed state or an ice state; determining whether the infrared ray channel has a first temperature (T1) Detecting a weak icing when the temperature of the cloud is in a mixed phase or an ice state and the weak icing is detected if the brightness temperature is lower than the first set temperature and lower than a second set temperature (T2) And an icing detection device for detecting intermediate icing if the temperature is lower than the second set temperature and a third set temperature (T3) or higher, and for detecting strong icing when the brightness temperature is lower than the third set temperature, , And the relationship of T1, T2 and T3 is the first set temperature T1> the second set temperature T2> the third set temperature T3.

The icing detection device may provide the icing detection information together with the cloud image information.

According to another aspect of the present invention, there is provided a method for controlling a geostationary satellite, comprising the steps of: a) detecting a brightness temperature value of an infrared channel of an observation area from a geostationary- b) determining whether the brightness temperature of step a) is greater than a first set temperature; c) if the brightness temperature is higher than the first set temperature in step b), determining whether the cloud image is mixed or ice; d) determining in step c) that if the cloud phase is not a mixed phase or an ice phase, no icing occurs; e) detecting weak icing in the ice phase or mixed phase in step c); f) detecting weak icing when the brightness temperature of step a) is less than a first set temperature and is greater than a second set temperature; g) detecting the intermediate icing if the brightness temperature in step a) is lower than the second set temperature and is equal to or higher than the third set temperature; h) detecting strong icing when the brightness temperature in step a) is less than the third set temperature, wherein the first set temperature T1> the second set temperature T2> the third set temperature (T3).

According to the icing detection system of the present invention, it is possible to grasp the actual situation of icing based on observations in a wide area, and icing detection data can be provided directly to the aviation pilots, which can be helpful for aircraft operation.

According to the present invention, it is possible to contribute to improvement of medium and small-scale forecasting ability for supporting short-term and real-life forecast by providing icing prediction information using Chollian satellite, improve preceding signal detection ability, and provide quick and accurate valuable weather information service .

1 is a block diagram showing an embodiment of the icemaking detection system according to the present invention,
2 is a flow chart illustrating an embodiment of an icing detection method according to the present invention, and Fig.
FIG. 3 is a view showing the icing detection result according to the present invention.

According to the present invention, there is provided an icing detection system for determining the icing and icing intensity using the brightness temperature and the cloud image information of the infrared channel detected by the geo-stationary geostationary satellite. The icicle detection system according to the present invention includes a geostationary weather satellite, a satellite signal receiver, and an icing detection device.

The geosynchronous meteorological satellite 10 includes an observation channel sensor for an infrared ray channel and an observation channel for visible ray detection, and outputs the detection value. In case of Chollian satellite, it outputs binary data of 1 infrared ray, 2 infrared ray, water vapor channel, and visible channel. In the present invention, the brightness temperature values of three infrared channels (WV 6.7, IR 10.8, and IR 12.0 μm) are used.

The satellite signal receiver 20 receives the output signals of the three infrared channels from the geostationary satellite 10.

The ice-making detector 30 converts the output value of the infrared channel into a brightness temperature value, determines a cloud image when the brightness temperature value exceeds a first set temperature, and determines whether the cloud image is mixed or ice- And detects weak icing when the cloud phase is in a mixed phase or an ice phase and detects weak icing when the brightness temperature value is lower than a first set temperature and is higher than a second set temperature, Detecting a middle icing when the temperature value is equal to or lower than the second set temperature and a third set temperature; and detecting the strong icing if the brightness temperature value is less than the third set temperature. Here, the relationship between the first set temperature> the second set temperature> the third set temperature.

The icicle detection system can display the icing detection information output from the icicle detection device 30 together with the cloud image and provide it for flight operation.

When icing is calculated using satellite data, the possibility of icing relatively in the case of having the same cloud characteristic (cloud image, effective particle radius, etc.) over a large area is small, Is high.

The iris detection method of the icemap detection system configured as described above includes the steps of detecting (S10) a brightness temperature value of an infrared channel in an observation area from a geostationary-satellite meteorological satellite, as shown in Fig. 2, (S21). In step S21, it is determined whether the cloud image is a mixed image or an ice image if the brightness temperature is greater than the first set temperature in step S20. If the cloud image is a mixed image or an ice image (S22); determining whether or not icing is not present if the brightness temperature is lower than the first set temperature and lower than the second set temperature; (S40, S31) detecting the middle icing when the brightness temperature is equal to or lower than the second set temperature and equal to or higher than the third set temperature, And a step (S50, 51) of detecting strong icing when the temperature is lower than the set temperature.

Here, the relationship between the first set temperature T1, the second set temperature T2, and the third set temperature T3 is T1> T2> T3. It is preferable that the values of T1, T2 and T3 are corrected according to the season.

The icicle detection system and the detection method using the icicle detection system according to the present invention will now be described in detail with reference to the accompanying drawings.

In one embodiment, the infrared channel is IR10.8 channel, T1 is about 284K, T2 is about 226K, and T3 is about 168K.

The cloud image determination step may be performed such that a cloud pixel having an IR 10.8 channel brightness temperature of less than 238 K, a brightness difference between IR 10.8 channel and IR 12.0 channel brightness temperature of 4.5 K or more, or a brightness temperature of IR 6.7 channel of less than 234 K, Cloud pixels whose IR10.8 channel brightness temperature is less than or equal to 238K and less than or equal to 268K or IR6.7 channel brightness temperatures less than or equal to 234K and less than or equal to 250K are determined as an ice phase, For a cloud pixel not judged as a mixed phase, a cloud pixel having an IR 10.8 channel brightness temperature of 285 K or more, or an IR 6.7 channel brightness temperature of 250 K or more is determined as a water phase ).

That is, the brightness temperature of the infrared channel 1 (IR10.8) of the geostationary satellite 10 is used. It is desirable to use the brightness temperature directly because the brightness temperature can correspond to the amount of radiation one-to-one through the Planck curve and reduce the uncertainty in conversion from brightness temperature to ambience temperature. The criteria for classifying low intensity icing, medium icing icing, and high icing icing based on 284K are set at boundary values of 226K and 168K.

The brightness temperature of the IR10.8 channel reflects the cloudiness temperature of a relatively thick cloud. Therefore, if there is very thin cirrus in the upper layer, the brightness temperature of IR10.8 channel is high. Therefore, in such a case, it is difficult to detect icing only by checking the boundary value of IR10.8. To compensate for this, cloud image information was additionally used for icing detection. It is very useful in identifying the ice phase by using the brightness temperature of IR12.0, IR6.7 to produce the cloud image.

Fig. 3 is an image of icing detected according to the present invention and reflected on a map together with a cloud image. Fig. That is, Fig. 3 can be said to be the final product of icing detection. In the figure, blue, yellow and red indicate the same meanings as in Table 1, and green + indicates the pyrol measurement point.

Code value meaning color 0 No icing One light icing BLUE 2 Moderate icing YELLOW 3 heavy icing RED 999 Missing

The output may be created every 15 minutes, which is the Cheonnyang-san satellite observation period. Therefore, according to the present invention, it is possible to provide icing information of Asia updated every 15 minutes for the weather information.

10: geostationary satellite of geostationary orbit 20: satellite signal receiver
30: Icing detection device

Claims (5)

A geostationary meteorological satellite provided with observation sensors for a plurality of infrared channels and outputting a brightness temperature value through a plurality of infrared channels;
A satellite signal receiver for receiving the plurality of infrared channel output values from the geostationary-satellite meteorological satellite;
Determining whether a cloudiness image is formed when the brightness temperature value of one of the infrared channels exceeds a first set temperature, detecting no icing if the cloudiness image is not mixed or ice, exceeding the first set temperature, And detects a weak icing if the cloud phase is a mixed phase or an ice phase and detects weak icing if the brightness temperature value is lower than the first set temperature and lower than a second set temperature, Detecting an intermediate icing when the temperature is equal to or higher than the set temperature, and detecting strong icing when the brightness temperature is lower than the third set temperature, and outputting icing detection information,
Here, the first set temperature T1> the second set temperature T2> the third set temperature T3. The method according to claim 1,
Wherein the icing detection device provides the icing detection information together with the cloud image information. The method according to claim 1,
Wherein the first set temperature, the second set temperature, and the third set temperature are adjusted in accordance with the season. a) detecting a brightness temperature value of an infrared channel of an observation area from a geostationary-satellite;
b) determining whether the brightness temperature of step a) is greater than a first set temperature;
c) if the brightness temperature is higher than the first set temperature in step b), determining whether the cloud image is mixed or ice;
d) determining in step c) that if the cloud phase is not a mixed phase or an ice phase, no icing occurs;
e) detecting weak icing in the ice phase or mixed phase in step c);
f) detecting weak icing when the brightness temperature of step a) is less than a first set temperature and is greater than a second set temperature;
g) detecting the intermediate icing if the brightness temperature in step a) is lower than the second set temperature and is equal to or higher than the third set temperature;
h) detecting strong icing when the brightness temperature of step a) is less than the third set temperature,
Here, the first set temperature T1> the second set temperature T2> the third set temperature T3. 5. The method of claim 4,
Wherein the first set temperature, the second set temperature, and the third set temperature are adjusted according to the season.

Images