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CPM Signals for Satellite Navigation in the S and C Bands.

Xue R, Sun Y, Zhao D - Sensors (Basel) (2015)

Bottom Line: With the successive opening of the S and C bands to GNSS service, the multi-band combined navigation is predicted to become a key technology for future high-precision positioning navigation systems, and a single modulation scheme satisfying the requirements in each band is a promising solution for reducing user terminal complexity.A universal modulation scheme based on the continuous phase modulation (CPM) family suitable for the above bands' demands is proposed.Simulation results show that the proposed CPM signals can not only satisfy the constraint condition of compatibility in different bands well and reduce user terminal complexity, but also provide superior performance in terms of tracking accuracy, multi-path mitigation and anti-jamming compared to other candidate modulation schemes.

View Article: PubMed Central - PubMed

Affiliation: College of Information & Communication Engineering, Harbin Engineering University, Harbin 150001, China. xuerui0216@hotmail.com.

ABSTRACT
Frequency allocations in the L band suitable for global navigation satellite system (GNSS) services are getting crowded and system providers face an ever tougher job when they try to bring in new signals and services while maintaining radio frequency compatibility. With the successive opening of the S and C bands to GNSS service, the multi-band combined navigation is predicted to become a key technology for future high-precision positioning navigation systems, and a single modulation scheme satisfying the requirements in each band is a promising solution for reducing user terminal complexity. A universal modulation scheme based on the continuous phase modulation (CPM) family suitable for the above bands' demands is proposed. Moreover, this paper has put forward two specific CPM signals for the S and C bands, respectively. Then the proposed modulation schemes, together with existing candidates, are comprehensively evaluated. Simulation results show that the proposed CPM signals can not only satisfy the constraint condition of compatibility in different bands well and reduce user terminal complexity, but also provide superior performance in terms of tracking accuracy, multi-path mitigation and anti-jamming compared to other candidate modulation schemes.

No MeSH data available.


CPM signal generator scheme for GNSS.
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sensors-15-13184-f001: CPM signal generator scheme for GNSS.

Mentions: The CPM can be decomposed into continuous phase encoder (CPE) and memoryless modulator (MM) [16], which greatly reduces implementation complexity. The signal generation block diagram of CPM as future GNSS modulation is shown in Figure 1, where and are mapping functions of in-phase and quadrature branches, defined as: (3)I(τ,Xn)=cosϕ¯(τ,Xn)(4)Q(τ,Xn)=sinϕ¯(τ,Xn) where represents the physical tilted phase given by [16]: (5)ϕ¯(τ,Xn)=[2πh[∑i=0n−Lui]p+4πh∑i=0L−1un−iq(τ+iT)+W(τ)]2π with: (6)W(τ)=πh(M−1)τT−2πh(M−1)∑i=0L−1q(τ+iT)+(L−1)(M−1)πh where the operator is modulo operator, is the integral of and .


CPM Signals for Satellite Navigation in the S and C Bands.

Xue R, Sun Y, Zhao D - Sensors (Basel) (2015)

CPM signal generator scheme for GNSS.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507614&req=5

sensors-15-13184-f001: CPM signal generator scheme for GNSS.
Mentions: The CPM can be decomposed into continuous phase encoder (CPE) and memoryless modulator (MM) [16], which greatly reduces implementation complexity. The signal generation block diagram of CPM as future GNSS modulation is shown in Figure 1, where and are mapping functions of in-phase and quadrature branches, defined as: (3)I(τ,Xn)=cosϕ¯(τ,Xn)(4)Q(τ,Xn)=sinϕ¯(τ,Xn) where represents the physical tilted phase given by [16]: (5)ϕ¯(τ,Xn)=[2πh[∑i=0n−Lui]p+4πh∑i=0L−1un−iq(τ+iT)+W(τ)]2π with: (6)W(τ)=πh(M−1)τT−2πh(M−1)∑i=0L−1q(τ+iT)+(L−1)(M−1)πh where the operator is modulo operator, is the integral of and .

Bottom Line: With the successive opening of the S and C bands to GNSS service, the multi-band combined navigation is predicted to become a key technology for future high-precision positioning navigation systems, and a single modulation scheme satisfying the requirements in each band is a promising solution for reducing user terminal complexity.A universal modulation scheme based on the continuous phase modulation (CPM) family suitable for the above bands' demands is proposed.Simulation results show that the proposed CPM signals can not only satisfy the constraint condition of compatibility in different bands well and reduce user terminal complexity, but also provide superior performance in terms of tracking accuracy, multi-path mitigation and anti-jamming compared to other candidate modulation schemes.

View Article: PubMed Central - PubMed

Affiliation: College of Information & Communication Engineering, Harbin Engineering University, Harbin 150001, China. xuerui0216@hotmail.com.

ABSTRACT
Frequency allocations in the L band suitable for global navigation satellite system (GNSS) services are getting crowded and system providers face an ever tougher job when they try to bring in new signals and services while maintaining radio frequency compatibility. With the successive opening of the S and C bands to GNSS service, the multi-band combined navigation is predicted to become a key technology for future high-precision positioning navigation systems, and a single modulation scheme satisfying the requirements in each band is a promising solution for reducing user terminal complexity. A universal modulation scheme based on the continuous phase modulation (CPM) family suitable for the above bands' demands is proposed. Moreover, this paper has put forward two specific CPM signals for the S and C bands, respectively. Then the proposed modulation schemes, together with existing candidates, are comprehensively evaluated. Simulation results show that the proposed CPM signals can not only satisfy the constraint condition of compatibility in different bands well and reduce user terminal complexity, but also provide superior performance in terms of tracking accuracy, multi-path mitigation and anti-jamming compared to other candidate modulation schemes.

No MeSH data available.