Differences

This shows you the differences between two versions of the page.

--- en:rmds [2013/06/26 11:33] – fluktuacia
+++ en:rmds [2017/08/04 21:24] – external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Radio Meteor Detector Set RMDS01A ======
+====== Radio Meteor Detector Station RMDS01A ======
-Detector set RMDS01A is the basic SDR receiver set for radio detection of meteor trails. Compared to other methods, its main advantage is in fact, that it uses software-defined receiver, that enables various advanced signal processing techniques.
+RMDS01A device is the basic SDR receiver set for radio detection of meteor trails. Compared to other methods, its main advantage is in fact, that it uses software-defined receiver, that enables various advanced signal processing techniques.
+{{ :cs:designs:rmds:rmds02d_station.jpg?direct&400 |  Bolidozor RMDS02D station}}
 ====== Meteor detection using GRAVES radar ======
@@ Line 13: / Line 15: @@
 ==== Necessary equipment ====
-  - Receiver [[cs:sdrx|SDRX01B]] [[http://www.ust.cz/shop/product_info.php?cPath=29&products_id=76 | e-shop UST]]
+  - Receiver [[en:sdrx|SDRX01B]] [[http://www.ust.cz/shop/product_info.php?cPath=29&products_id=76 | e-shop UST]]
   - [[http://www.mlab.cz/Modules/Clock/CLKGEN01B/DOC/DG8SAQ_emulator.cs.pdf|Frequency synthesizer]] tunable through USB [[http://www.ust.cz/shop/product_info.php?products_id=90 | e-shop UST]]
-  - 2x power module [[cs:unipower|UNIPOWER02A]]  [[http://www.ust.cz/shop/product_info.php?cPath=22_35&products_id=127 | e-shop UST]]
+  - 2x power module [[en:unipower|UNIPOWER02A]]  [[http://www.ust.cz/shop/product_info.php?cPath=22_35&products_id=127 | e-shop UST]]
   - 2x Power Supplies 12V [[http://www.ust.cz/shop/product_info.php?cPath=30_50&products_id=115 | e-shop UST]]
   - Coaxial cable RG58 [[http://www.ust.cz/shop/product_info.php?cPath=30_43&products_id=174 | e-shop UST]]
-  - Preamplifier [[cs:lna|LNA01A]] [[http://www.ust.cz/| UST]]
+  - Preamplifier [[en:lna|LNA01A]] [[http://www.ust.cz/| UST]]
   - 3x SMA cable connector [[http://www.ust.cz/shop/product_info.php?cPath=30_59_71&products_id=207 | e-shop UST]]
   - UHF connector - panel socket and cable jack (for antenna construction).
@@ Line 30: / Line 32: @@
 === 1/4 Ground Plane ===
-This is the basic antenna for receiving the signal reflected from ionized trails. It has an advantage in having a small size, so it can be installed on balcony, terrace etc. Its simple construction enables easy assembly and this makes it particularly suitable for beginners.
+This is the most basic antenna for receiving the signal reflected from ionized trails. It has an advantage in having a small size, so it can be installed on balcony, terrace etc. Its simple construction enables easy assembly and this makes it particularly suitable for beginners.
 The main drawback is the emitting characteristic, that has a sharp zero in zenith. This causes a poor detection of meteors flying directly over the head in comparison with conventional visual observation.
@@ Line 46: / Line 48: @@
 Other interesting experiment could include the use of two crossed dipoles over conducting plane. This would probably enable the integration of amplifier directly into the antenna and the creation of the active antenna with better noise parameters and reliability than separated assembly of GP antenna and LNA.
-The [[http://en.wikipedia.org/wiki/Discone_antenna|Discone antena]] has also been tested for receiving of the reflected signal. It works, but its high wideband characteristics causes the unwanted signals to penetrate as well.
+The [[http://en.wikipedia.org/wiki/Discone_antenna|Discone antena]] has also been tested for receiving of the reflected signal. It works, but its high wideband characteristics causes the unwanted signals to penetrate in band as well.
 ==== Preamplifier LNA01A ====
-High quality preamplifier is necessary to operate with this type of antenna due to low gain and low intensities of reflected signal.
+High quality preamplifier is necessary to operate with 1/4 Ground Plane type of antenna due to low gain and low intensities of reflected signal.
-[[http://www.mlab.cz/Modules/CommRF/LNA01A/LNA01A_Bottom_Small.JPG|LNA01A]] is preamplifier constructed for metor detection in 2m band. It contributes to amplification of the signal form antenna and so it lowers the significance of receiver's own noise. In addition to that, it also minimizes the complications connected with coaxial cable signal transmission through compensation of cable damping. It is than possible to use cheaper coaxial cable of RG58 type.
+[[http://www.mlab.cz/Modules/CommRF/LNA01A/LNA01A_Bottom_Small.JPG|LNA01A]] is preamplifier constructed for meteor detection in 2m band. It contributes to amplification of the signal form antenna and so it lowers the significance of receiver's own noise. In addition to that, it also minimizes the complications connected with coaxial cable signal transmission through compensation of cable damping. It is than possible to use cheaper coaxial cable of RG58 type.
 ==== Coaxial connectors ====
@@ Line 71: / Line 73: @@
 Software-defined receiver developed primarily for radioastronomical experiments, its characteristics are more than sufficient for meteor detection as well. For more information about the receiver see [[en:sdrx| SDRX]]
-=== Signal digitalization ===
+=== Signal digitization ===
@@ Line 142: / Line 144: @@
 ===== Detection limits =====
-The sensitivity of system has not been yet experimentally tested, because of the missing data from other sources that can be used for comparison.
+The sensitivity of system has not been yet experimentally tested, because of the missing data from other sources that can be used for comparison. Sensitivity is also affected by various signals - [[meteory rusenie]]
 ===== Frequency stability =====
@@ Line 150: / Line 153: @@
 {{:cs:sdr:sdr_temp_calib.png?300|Odhad vlivu teploty na přijímací sestavu detektoru meteorů}}
-We have used Asus EEE, that is particularly suitable for portable detector.
+We have used Asus EEE, that is particularly suitable as portable detector.
@@ Line 169: / Line 172: @@
 LO of the receiver can be synchronised with GPS receiver or it is possible to mark the signal samples with [[cs:time_sync|the exact time]]. This methods enable the calculation of meteor trajectory and subsequently the land site as well.
-Synchronisation and the tuning of LO can be managed using FPGA [[cs:s3an|S3AN01A]] and GPS module [[cs:gps|GPS01A]].
+Synchronisation and the trimming of LO can be managed using FPGA [[cs:s3an|S3AN01A]] and GPS module [[cs:gps|GPS01A]].
-Tuning of the LO furthermore enables
+Trimming of the LO furthermore enables to reach a good temperature frequency stability of the system.
-Dolaďování lokálního oscilátoru umožní navíc dosáhnout dobré teplotní frekvenční stability systému.
+==== Portable system ====
-==== Mobilní souprava ====
-Mobilní varianta přijímače (s akumulátorovým napájením) je vhodná pro polní mobilní demonstrace meteorů, jako doplněk k optickému pozorování například na letních pionýrských táborech.
+A portable version of receiver (with accumulator power source) is suitable for field mobile meteor demonstration, as an addition to optical observation (for example at summer camps)
-[[http://www.astrozor.cz/index.php?udalost=81|ukázka takového způsobu použití]]
+[[http://www.astrozor.cz/index.php?udalost=81|demonstration of such application]]
-==== Autonomní detekční systém ====
+==== Autonomous detection system ====
-Integrování přijímače a detekční stanice do jednoho celku by umožnilo snížení celkového příkonu měřícího přístroje a zvýšení spolehlivosti.
+Receiver and detection station, integrated together to form one whole, would lower the total power consumption of detection apparatus and would increase the reliability as well.
-=== Vyhodnocovací počítač ===
+=== Decoding computer ===
-Protože je ke sparacování navzorkovaného signálu potřeba poměrně velký výpočetní výkon, je potřeba využívat vícejádrových řešení. Jedním z uvažovaných je například toto: [[http://www.hardkernel.com/renewal_2011/products/prdt_info.php?g_code=G135235611947|ODROID-X2]]
+The signal processing requires relatively high computational power. For this reason it is beneficial to make use of multi-core solutions. An example of such solution is following: [[http://www.hardkernel.com/renewal_2011/products/prdt_info.php?g_code=G135235611947|ODROID-X2]]
-=== Záloha napájení ===
+=== Power backup ===
-Výhodou autonomního systému by byla také možnost kompaktního řešení zálohování napájení například pomocí modulu [[cs:lion2cell|LION2CELL01A]] nebo úplně autonomní napájení ze solárních článků modulem [[cs:solarmini|SOLARMINI01A]].
+Another advantage of autonomous system would be the possibility to use compact power backup system, eg. with the help of [[cs:lion2cell|LION2CELL01A]] module or completely autonomous power supply made of solar cells module [[cs:solarmini|SOLARMINI01A]].
-=== Vysoké časové rozlišení ===
+=== High time resolution ===
-Přijímač by mohl obsahovat vysokorychlostní kruhový buffer vzorků, který se při eventu celý trvale uloží.
+The receiver could include high-speed circular sample buffer, that would be saved permanently in the case of event.
 ==== Meteor geocaching ====
-s vypočítanou dopadovou plochou meteoritů by se dalo zacházet, jako s cílem geocache.
+It would be possible to handle the calculated impact ellipse as a geocache target.
 ===== TODO =====
-  * Prozkoumat možnost ovládání Si570 přímo ze SpectrumLabu http://www.qsl.net/d/dl4yhf///////speclab/settings.htm
-  * Připravit .deb balíček pro instalaci na Linuxové stanici.
-  * Připravit zadání diplomové práce (vysilač pro detekci meteorů)
-  * Meteory rušenie [[meteory rusenie]]
-===== Související konstrukce =====
+  * To investigate the possibility of handling the Si570 directly through SpectrumLab http://www.qsl.net/d/dl4yhf///////speclab/settings.htm
+  * To create .deb instalation packet for Linux station.
+  * To invent diploma theses (concerning the transmitter for meteor detection)
+===== Related constructions =====
-  * Visuální meteorický detekční systém - [[cs:vmds|VMDS01A]]
+  * Visual meteor detection system - [[cs:vmds|VMDS01A]]
-===== Reference =====
+===== References =====
-  * [[http://radio.astronomie.cz/?p=41|Detekce meteorů v pásmu 144MHz (2m)]]
+  * [[http://radio.astronomie.cz/?p=41|Meteor detection in 144MHz band (2m)]]
   * [[http://www.imo.net/radio/practical/setups|International Meteor Organization - Some Classical Radio Meteor Astronomy Set-ups]]
   * http://spaceweatherradio.com/
-==== Podobné projekty ====
+==== Similar projects ====
   * [[http://brams.aeronomie.be/pages/brams_viewer|BRAMS]] - Belgian RAdio Meteor Stations.
-  * [[http://meteor.uwo.ca/research/radar/cmor_orbits.html|CMOR]] - The Canadian Meteor Orbit Radar - Projekt počítající z naměřených dat i dráhu meteoru.
+  * [[http://meteor.uwo.ca/research/radar/cmor_orbits.html|CMOR]] - The Canadian Meteor Orbit Radar - Project that calculates the trajectory of meteors based on measured data.
-  * [[http://www.rmob.org/index.php|RMOB.org]] - Radio Meteor Observing Bulletin - síť amatérských radiových pozorovatelů meteorů.
+  * [[http://www.rmob.org/index.php|RMOB.org]] - Radio Meteor Observing Bulletin - the network of amateur meteor radio observers.