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* For civilian accuracy, the equivalent of $100 GPS receivers, the signal of interest (C/A) is at 1575.42MHz(L1) with a bandwidth of ~2.046MHz.
 
* For civilian accuracy, the equivalent of $100 GPS receivers, the signal of interest (C/A) is at 1575.42MHz(L1) with a bandwidth of ~2.046MHz.
  
* For surveying accuracy, the signals of interest (C/A & P (Y)) are at 1575.42MHz(L1) and 1227.6MHz(L2) with a bandwidth of ~20.46MHz at each frequency.
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* For surveying accuracy, the signals of interest (C/A & P (Y)) are at 1575.42MHz(L1) and 1227.6MHz(L2) with a bandwidth of ~20.46MHz at each frequency.
  
 
* For military accuracy, you have to add the restricted decrypting hardware on top of the surveying requirements.
 
* For military accuracy, you have to add the restricted decrypting hardware on top of the surveying requirements.
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* http://gpsinformation.net/
 
* http://gpsinformation.net/
* A decent introduction to GPS, and even better, SDR implementations thereof, is "Fundamentals of Global Positioning System Receivers: A software approach", by James Bao-Yen Tsui (ISBN 0-471-38154-3).
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* A decent introduction to GPS, and even better, SDR implementations thereof, is "Fundamentals of Global Positioning System Receivers: A software approach", by James Bao-Yen Tsui (ISBN 0-471-38154-3).
 
* http://gpstrackit.com/blog/
 
* http://gpstrackit.com/blog/
 
* A regularly updated blog on the applications of GPS and GIS technology
 
* A regularly updated blog on the applications of GPS and GIS technology
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* http://www.glonass-ianc.rsa.ru/pls/htmldb/f?p=202:1:12061333542270124939 The Russians added needless complications when they selected a silly time-scale for their system and decided to share the spreading codes between satellites. GLONASS also consumes a lot more bandwidth. However, this would be an excellent demonstration of an SDR's adaptability, since a working software GPS receiver has all the necessary components that a GLONASS receiver requires. One just rearranges them differently. GALILEO falls into the same category.
 
* http://www.glonass-ianc.rsa.ru/pls/htmldb/f?p=202:1:12061333542270124939 The Russians added needless complications when they selected a silly time-scale for their system and decided to share the spreading codes between satellites. GLONASS also consumes a lot more bandwidth. However, this would be an excellent demonstration of an SDR's adaptability, since a working software GPS receiver has all the necessary components that a GLONASS receiver requires. One just rearranges them differently. GALILEO falls into the same category.
  
=== Q&A ===
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=== Q&A ===
  
 
'''Q:''' What about DGPS for GPS positioning accuracy improvement?
 
'''Q:''' What about DGPS for GPS positioning accuracy improvement?

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