Differences

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--- en:abl [2013/09/24 14:25] – [__Actuators__] kaklik
+++ en:abl [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
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 ===== Ground discharge box =====
+{{ :cs:designs:meteo:abl01a_ground_box.jpg?direct&600 |}}
 The ground balloon network station would consist of compact box containing technology needed to discharge the balloon sonde. The device must be able to withstand (in order of several years) the standby mode and wait for the command to release the sonde.
@@ Line 61: / Line 63: @@
 === Actuators ===
-Most of the actuators should be designed with an emphasis on maximal reliability. Therefore, they would probably be springs with burnable plastic fuses (silicon fiber or ribbon burned by a powerful resistor).[[en:nfet4x|NFET4X01B]] module can be used To switch the current to resistors.
+Most of the actuators should be designed with an emphasis on maximal reliability. Therefore, they would probably be springs with burnable plastic fuses (silicon fiber or ribbon burned by a powerful resistor). [[en:nfet4x|NFET4X01B]] module can be used To switch the current to resistors.
 == Pneumatics ==
@@ Line 84: / Line 86: @@
 It would be then sufficient to dry the hydrogen produced by this method by cartridge with silicagel.
-Another option is to decompose the [[http://en.wikipedia.org/wiki/Sodium_borohydride|Sodium_borohydride]] by a catalyst.
+Experiments with this metod showed difficulty in obtaining the galium back in order for it to be re-used.
+**Ferrosilicon method** makes use of a reaction between the sodium hydroxide, water and a [[https://en.wikipedia.org/wiki/Ferrosilicon|ferrosilicon]].
+Another option is a **catalysed decomposition** of the [[http://en.wikipedia.org/wiki/Sodium_borohydride|Sodium_borohydride]].
+In all cases, the volume of the carrier gas should be optimised with respect to required lift and the rate of climb.
 === Firmware ===
@@ Line 106: / Line 114: @@
   * Meteostation [[en:aws|AWS01B]] for measurement of the basic meteorological variables
   * [[en:gps|GPS01A]] - a time synchronisation, an absolute knowledge of the station position, the possibility to generate a DGPS correction
-  * Balloon __drag__ measurement
+  * Balloon lift measurement
   * Gas flow into the balloon (by an [[http://en.wikipedia.org/wiki/Orifice_plate|orifice plate]])
-===== Weather balloon =====
+===== Probing balloon =====
 A non-flying prototype of the balloon will be developed using [[http://www.mlab.cz/Server/GenIndex/GenIndex.php?lang=cs&path=/Modules|MLAB]] modules.
@@ Line 130: / Line 138: @@
 The GPS must by chosen to function correctly at higher altitudes as well.((Limited by the [[http://en.wikipedia.org/wiki/CoCom#Legacy|CoCom]] directive)).
+== Transmitter ==
+Integrated transmitters.
+  * [[http://www.ti.com/ww/en/analog/sub_1_GHz_low_power_rf_ic/index.shtml?DCMP=rfvalueline&HQS=Other+OT+rfvalueline|CC115L]]
 === Power supply during the flight ===
   * [[http://en.wikipedia.org/wiki/Lithium_battery|Lithium battery]] (does not generate heat, minimum operating temperature is -60°C)
-  * __Magnesium__ battery (generates heat to keep the electronics warm)
+  * Magnesium battery (generates heat to keep the electronics warm)
-  * [[http://en.wikipedia.org/wiki/Silver-oxide_battery|Stříbro-oxidový článek]] (withstands lower operating temperatures and is environmentally friendly
+  * [[http://en.wikipedia.org/wiki/Silver-oxide_battery|Silver-oxide battery]] (withstands lower operating temperatures and is environmentally friendly
-  * Ideal for use would be [[https://www.youtube.com/watch?feature=player_embedded&v=OtM6XJlynkk|supercapacitors]]
+  * An ideal option would be the use of [[https://www.youtube.com/watch?feature=player_embedded&v=OtM6XJlynkk|supercapacitors]]
 The solution to the problem of low temperature at higher altitudes could involve the preheating of the balloon at startup.
@@ Line 172: / Line 187: @@
 The balloon must not be filled with flammable and explosive gases, with the exception of a permission issued by CAA ([[http://www.caa.cz/index.php?lang=2]]).
-Restrictions on the materials used for antennae and batteries are not specified. Such restrictions are not specified for the materials used for the balloon as well, but when using a balloon with high __luminosity__ or made of materials with high light or radar reflectivity, it must be reported to nearest air traffic services __station__. A material (a rope, a thread) connecting the balloon with the sonde must not tolerate a force exceeding 230N.
+Restrictions on the materials used for antennae and batteries are not specified. Such restrictions are not specified for the materials used for the balloon as well, but when using a balloon with high luminosity or made of materials with high light or radar reflectivity, it must be reported to nearest air traffic control centre. A material (a rope, a thread) connecting the balloon with the sonde must not tolerate a force exceeding 230N.
-=== __Ascent range__ ===
+=== Ascent altitude ===
 Without limits.
-=== Discharge place ===
+=== Deployment site ===
 The restrictions include all Prohibited, Restricted and Dangerous areas, as well as temporarily activated areas during their use, except when a permit has been issued by Civil Aviation Authority or when the area is reserved for the flight of the balloon in question. Operations close to the state borders or airports are problematic and as such are not recommended.
@@ Line 194: / Line 209: @@
+==== Launch Planning ====
+The launch of the balloons must be planned automatically with regard to the effectiveness of the measurement and the air traffic safety as well.
+=== Aviation maps ===
+  * [[http://skyvector.com/|SkyVector]]
+  * [[http://openaviationmap.org/|Open Aviation Map]]
+  * [[http://lis.rlp.cz/ais_data/aip/data/valid/e6-3.pdf|Aeronautical information service]] - AIP chapter ENR 6.
+Other maps are mostly scanned versions of originally paper aviation maps and so are not suitable for automatic planning.
+===== Documentation =====
+[[http://www.mlab.cz/Designs/Measuring_instruments/ABL01A/DOC/ABL01A.cs.pdf|The project's summary technical report]]
+==== Technical documentation ====
+The project's technical documentation is saved in SVN repository at MLAB: http://svn.mlab.cz/svnmlab/Designs/Measuring_instruments/ABL01A/
+  svn://svn.mlab.cz/MLAB/Designs/Measuring_instruments/ABL01A/
+==== Project management ====
+For tasks management and supervision of their implementation we use [[http://www.mlab.cz/redmine/| Redmine]].
+Documents and presentations concerning project management are stored here:
+  svn co https://lynx1.felk.cvut.cz/svn-students/pto/pto-13138-1 svnPTO
+==== Project presentations ====
+  - [[http://prezi.com/bnhig7zmyoin/automaticky-vypousteny-meteobalon/|Introduction]]
+  - [[http://prezi.com/8hxyotflpfzt/2-prezentace-abl01a/|First results]]
+  - [[http://prezi.com/3d4t973s-tk0/iro-automaticky-vypoustec-meteobalonu/|Experimental working prototype]]
+=== Videos ===
+  * [[http://youtu.be/yZOg_d113f8|Test of the prototype]]
+=== Photos ===
+  * [[https://picasaweb.google.com/109626411951658757207/AutovypoustecMeteobalonuABL01A?noredirect=1|Prototype construction and testing ]]
+===== Implementation means =====
+==== People ====
+The project is carried out by the team of several ČVUT students from Department of Measurement and Department of Cybernetics.
+  * [[https://usermap.cvut.cz/profile/pomiceva/|Bc. Eva Pomíchalová]]  -  Air and Space Systems
+  * [[https://usermap.cvut.cz/profile/kakonjak/|Bc. Jakub Kákona]] -  Air and Space Systems
+  * [[https://usermap.cvut.cz/profile/poskozby/|Bc. Zbyněk Poskočil]] - Sensors and measurement
+  * [[https://usermap.cvut.cz/profile/hanuson1/|Bc. Ondřej Hanuš]] -  Air and Space Systems
+  * [[https://usermap.cvut.cz/profile/jichapav/|Bc. Pavel Jícha]] - Cybernetics and Robotics
+==== Technical support ====
+Most parts of the project were provided by [[http://www.ust.cz/|Universal Scientific Technologies s.r.o.]] {{ :logo_ust.png?nolink|Universal Scientific Technologies s.r.o.}}
+Suppliers of the construction equipment:
+  * [[http://macgyver.sh.cvut.cz/|MacGyver – bastlíři SH]]
+  * [[http://aerospace.fsik.cvut.cz/?f_lng=en|Department of Aerospace Engineering]]
+===== References =====
+  * [[http://portal.chmi.cz/files/portal/docs/meteo/oa/sondaz_PTU_vitr.html|ČHMÚ measurements]].
+==== Similar projects ====
+  - http://projecthorus.org/ http://blog.czanso.com/ http://chab.chytry.info/
+  - http://www.airshipclub.com/folie.php
+==== TODO ====
+  * A sounding rocket could be a future improvement of the project.