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  • Indoor Navigation
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  • Space GNSS Receiver
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  • WADGPS
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  • Integrity Monitoring
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  • GPS/INS Navigation
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INDOOR NAVIGATION home > Research > Indoor Navigation
1. GNSS ༺ ǻ ʿ伺
 
  GPS 뺯Ǵ GNSS Ȯ̶ ִ. 忡 Ȯ ġظ ִٴ ǹ̰ ȴ. ̷ GNSS ׹ о߿ ־ Ǿ.
 
  GNSS Ȱ ִµ, ù ° ȣ ܵǴ ̿ Ұϴٴ ̴. ̴ 20,000km ΰ ȣ ϹǷ, ŵǴ ȣ Ⱑ ſ ϱ ̴. ̷ dz ׸  GNSS 뼺 ũ ̴. ° ġ ( Ӹ ʿ Ѵ. ⿡ , ġ Ȯ . (DOP )) Ȯ ̴. ̷ װ о߿ GNSS ̿ϴµ, ū ְ ȴ.
 
 GNSS ̷ ༺ ذϱ ź Ǿ µ, ǿ ߰ ȣ ҽ ̿Ͽ GNSS ༺ ϴ ý ǻ(Pseudolite) ýۿ ̴.
 
Figure 1. Why do we need Pseudolites?
 
 
2. ǻ

ǻ GNSS ȣ Ͽ ű Ͽ ġ ϳ GNSS ִ ó νϵ ϴ ġ̴. ǻ GNSS , GNSS ű ǻ ȣ Ͽ Ȱϴ ϴ.
 
Table 1. GNSS Satellites vs Pseudolites
 
 
3. ǻ

 ǻ ̹ ó GNSS ȣ Ͽ Ѵ. ⼭ GPS (ΰ L1 ļ ) ͸ ٷ絵 ϰڴ. ǻ ⺻ Ʒ ׸ . δ L1 ļ carrier ϰ, 50Hz navigation data bit C/A code ͽ(mixing)Ͽ ׳ ܺη ϴ ̴.
Figure 2. Block diagram of Pseudolite
 

4. ǻ ̿ dz׹ý
 
ǻ о߿ Ȱ ϴ. ǥ оߴ dz׹ о, װ ý, GNSS ȯ( ȭ) ׹, E911 ִ. Ʒ ׸ ǻ ̿ ׹ý з̴.
 
Figure 3. Classification of Pseudolite Navigation System

ǿ 1999 ǻ ̿ dz׹ý , Ʒ ׸ ǻ ̿ cm Ȯ ġ ִ dz׹ý Ͽ.
 
Figure 4. Pseudolite Indoor Navigation System in Seoul Nat'l Univ.

  ǿ 񵿱İ ǻ ý Ͽ. 񵿱 ý ǻ Ŭ ̱ , ̷ ߻ϸ, ̸ ϱ ׹ý ؾ Ѵ. ڴ ű Բ ͸ ޱ ũ ʿϴ. ݸ ý ǻ Ŭ DZ , ڴ ߰ ű⸸ cm ׹ ϴ.
 

5. dz׹ý м
 
ǿ dz׹ý м ̴.
Figure 5. Static error of Pseudolite based Indoor Navigation System
 
Figure 6. Dynamic error of Pseudolite based Indoor Navigation System
 
Figure 7. Zigzag test of Pseudolite based Indoor Navigation System
 

6. Ȳ GNSS

  ǿ ǻ ý ̴.
 
2000 : 2° ǻ dz׹ý
2002 : ǻ ׹ý
2005 : װ GPS ǻ ý
2007 : ̿ Ʈ ǻ(Transceiver) ׹ý
2009 : AP ̿ ġ Ȯ ˰ ( Ư , //߱ Ư )
2011 : ű⸦ ̿ ǻ ׹ ˰ ( Ư )
 
Figure 8. Automatic Control of Vehicle using Pseudolite based Indoor Navigation System