Tira fågel

TIRA

Description of the radar set, tactical-technical characteristics

TIRA

The TIRA (Tracking and Imaging Radar) space observation radar includes a narrow-band tracking radar operating in the L-band and a broad-band ( MHz) imaging radar operating in the K_u-band. The system serves primarily as an experimental radar for the development and investigation of radar techniques for space observation. It is hosted by the Fraunhofer Institute for High Frequency Technology and Radar Techniques (FHR).

The radar was commissioned in as a target tracking radar for observing rocket launches.

The antenna is a Cassegrain antenna with a 36 m diameter parabolic reflector. The movable part weighs  metric tons. It is protected by a radome of meters in diameter.

Almost 50 years after it was constructed, the space observation radar TIRA now has a new cover. The so-called radome protects the highly sensitive radar system from wind and weather. To ensure that the radar would not be exposed to the elements for several months, the new radome was first constructed from the inside before the old radome was removed. The new radome with a diameter of m is a little bit smaller than its predecessor. The overall size, however, is still a world record.

Sun, rain and wind had left their mark on the cover over the last five decades. The time had now come to replace the entire radome after almost 50 years in an exposed location in Wachtberg.

After years of planning and preparing for the replacement of the world's largest radome, i.e. the cover of the space observation radar TIRA Wachtberg, work finally commenced in January with the construction of the scaffolding inside the cover. The aim was to gradually raise the scaffolding to just below the parabolic reflector, i.e. to a height of approximately 44 meters. The maximum height was reached early in the summer after constructing tons of scaffolding.

1, boreholes to mou

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Pesimävarmuusindeksien käyttö

Pesimävarmuusindeksit ovat samat kuin valtakunnallisessa lintuatlaksessa (). Suomen lintuatlaksen tavoitteena on tutkia maamme pesimälintulajien levinneisyyksien muutoksia.

Suomen neljänteen lintuatlakseen kerätään havaintoja vuosina Pesimävarmuusindeksien käytöstä kerrotaan tarkemmin täällä:

Indeksien yhteydessä voi käyttää myös tarkempia kaksinumeroisia alaindeksejä.

A.  Epätodennäköinen pesintä (indeksi 1)

• 1. Havaittu pesimäaikaan lajin yksilö, mutta havainto ei viittaa pesintään kyseisessä atlasruudussa. Indeksiin 1 luetaan ruudulla muuttomatkalla oleviksi tulkitut linnut (ylimuuttavat, muutolla lepäilevät), naapuriruudulle matkalla oleviksi tulkitut linnut (esim. ruoanhakumatkat), selvästi pesimättömät kiertelijät tai nuoret linnut sekä harvinaisuudet, joille atlasruutu ei ole levinneisyysaluetta.

B. Mahdollinen pesintä (indeksit )

• 2 . Havaittu yksittäinen lintu kerran (esim. laulava tai soidinääntelevä koiras, nähty tai kuultu naaras) pesimäaikaan lajille sopivassa pesimäympäristöss