TY - JOUR
T1 - Compass-M1 broadcast codes in E2, E5b, and E6 requency bands
AU - Gao, Grace Xingxin
AU - Chen, Alan
AU - Lo, Sherman
AU - De Lorenzo, David
AU - Walter, Todd
AU - Enge, Per
N1 - Funding Information:
Manuscript received July 01, 2008; revised June 01, 2009. Current version published July 17, 2009. This work was supported in part by the U.S. Federal Aviation Administration under Cooperative Agreement 95-G-005. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Gerard Lachapelle.
PY - 2009
Y1 - 2009
N2 - With the launch of the Compass-M1 satellite on 14 April 2007, China is set to become the latest entrant into global navigation satellite systems (GNSS). Understanding the interoperability and integration of the Chinese Compass with the current GNSS, namely the U.S. Global Positioning System (GPS), the European Galileo, and the Russian GLONASS, requires knowing and understanding its signal structures-specifically its pseudorandom noise (PRN) codes and code structures. Moreover, the knowledge of the code is a prerequisite for designing receivers capable of acquiring and tracking the satellite. More important is determining if the signal may degrade performance of the current GNSS in the form of interference. Finally, we are eager to learn from the code and signal design of our Chinese colleagues. For this research, we set up a 1.8-m dish antenna to collect the broadcast Compass-M1 signals. Even with the dish antenna, the received signal is still weak and buried in thermal noise. We then apply signal processing and are able to extract the PRN code chips out of the noise in all three frequency bands. The PRN codes are thousands of bits long. In addition, we find that the Compass-M1 PRN codes in all frequency bands are Gold codes. We also derive the Gold code generators to represents thousands of code chips with fewer than a hundred bits. Finally, we implement these codes in our software receiver to verify and validate our analysis.
AB - With the launch of the Compass-M1 satellite on 14 April 2007, China is set to become the latest entrant into global navigation satellite systems (GNSS). Understanding the interoperability and integration of the Chinese Compass with the current GNSS, namely the U.S. Global Positioning System (GPS), the European Galileo, and the Russian GLONASS, requires knowing and understanding its signal structures-specifically its pseudorandom noise (PRN) codes and code structures. Moreover, the knowledge of the code is a prerequisite for designing receivers capable of acquiring and tracking the satellite. More important is determining if the signal may degrade performance of the current GNSS in the form of interference. Finally, we are eager to learn from the code and signal design of our Chinese colleagues. For this research, we set up a 1.8-m dish antenna to collect the broadcast Compass-M1 signals. Even with the dish antenna, the received signal is still weak and buried in thermal noise. We then apply signal processing and are able to extract the PRN code chips out of the noise in all three frequency bands. The PRN codes are thousands of bits long. In addition, we find that the Compass-M1 PRN codes in all frequency bands are Gold codes. We also derive the Gold code generators to represents thousands of code chips with fewer than a hundred bits. Finally, we implement these codes in our software receiver to verify and validate our analysis.
KW - Global navigation satellite system (GNSS)
KW - Pseudorandom noise codes
KW - Spread spectrum
UR - http://www.scopus.com/inward/record.url?scp=68249135733&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=68249135733&partnerID=8YFLogxK
U2 - 10.1109/JSTSP.2009.2025635
DO - 10.1109/JSTSP.2009.2025635
M3 - Article
AN - SCOPUS:68249135733
SN - 1932-4553
VL - 3
SP - 599
EP - 612
JO - IEEE Journal on Selected Topics in Signal Processing
JF - IEEE Journal on Selected Topics in Signal Processing
IS - 4
ER -