北斗L/C双波段导航信号调制方式及性能评估

doi:10.7527/S1000-6893.2022.27775

Abstract

Abstract:

Large interval L/C dual-band navigation can significantly improve positioning accuracy and robustness, and will become the development trend of high precision satellite navigation system in the future. To reduce the complexity of dual-frequency terminals, a universal modulation scheme is designed, which not only meets the spectrum compatibility constraints of L/C-band, but also has good navigation performance. A combination of Orthogonal Frequency Division Multiplexing-Continuous Phase Modulation (OFDM-CPM) is proposed for L/C dual-band navigation. OFDM-CPM signals with the modulation index h=0.5 and the correlation length L consistent with the number of OFDM-CPM symbols are selected as L/C dual-band candidate navigation signals. Dual-frequency points are set, and the basic navigation performance indicators including compatibility, code tracking accuracy and anti-multipath interference are evaluated. The results show that in L-band, OFDM-CPM(15) has excellent code tracking performance and anti-multipath ability, and is easier to coexist with other candidate signals. In C-band, OFDM-CPM(10) can well take into account the out-of-band constraint and navigation performance requirements of C-band signals, and has the best performance in code tracking accuracy and anti-multipath interference, providing a choice for the design of navigation signal system of BDS in the future.

Key words: L/C dual-band navigation, modulation mode, Orthogonal Frequency Division Multiplexing (OFDM), Continuous Phase Modulation (CPM), navigation performance

CLC Number:

V249.3

Yude NI, Mohan YI, Ruihua LIU. L/C dual-band navigation signal modulation mode and performance evaluation of BeiDou system[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(12): 327775.

Figures/Tables 12

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干扰信号		SSC/dB
干扰信号		BPSK（5）	BPSK（10）	BOCc（10，5）	OFDM-CPM（15）
	BPSK（5）	-68.287 9	-51.464 3	-60.354 9	-96.330 8
	BPSK（10）	-51.464 3	-65.008 9	-43.531 3	-99.745 4
	BOCc（10，5）	-60.354 9	-43.531 3	-52.421 9	-77.049 7
	OFDM-CPM（15）	-96.330 8	-99.745 4	-77.049 7	-86.155 1

干扰信号		CT_SSC/dB
干扰信号		BPSK（5）	BPSK（10）	BOCc（10，5）	OFDM-CPM（15）
	BPSK（5）	-56.176 6	-56.176 6	-56.176 6	-75.286 0
	BPSK（10）	-39.353 0	-39.353 0	-39.353 0	-78.700 6
	BOCc（10，5）	-48.243 7	-48.243 7	-48.243 7	-56.004 8
	OFDM-CPM（15）	-89.616 0	-88.372 5	-58.267 8	-61.487 7

候选信号	载波频率/MHz	OOBE/dBc
候选信号	载波频率/MHz	射电天文业务频段	上行信号	微波着陆系统频段
BPSK（10）	5 019.861	-20.842 5	-16.278 1	-13.517 8
BPSK（10）	5 022.93	-21.146 1	-16.842 7	-13.113 9
MSK（10）	5 019.861	-29.735 7	-17.640 6	-20.487 6
MSK（10）	5 022.93	-33.823 5	-25.582 6	-13.174 3
GMSK（10）	5 019.861	-41.183 9	-23.470 8	-25.357 8
GMSK（10）	5 022.93	-40.624 6	-28.357 4	-18.961 1
BOCs（5，5）	5 019.861	-19.108 9	-14.595 0	-11.787 1
BOCs（5，5）	5 022.93	-19.233 0	-14.846 4	-11.665 2
OFDM-CPM（10）	5 019.861	-39.534 3	-29.230 2	-15.770 5
OFDM-CPM（10）	5 022.93	-40.222 9	-32.315 0	-15.333 2
平均差值		-0.929 0	-3.345 9	2.934 6

候选信号	载波频率/MHz	PFD/（dB·W·m^-2）
候选信号	载波频率/MHz	射电天文业务频段	微波着陆系统频段
BPSK（10）	5 019.861	-130.194 6	-148.497 8
BPSK（10）	5 022.93	-130.498 2	-139.234 4
MSK（10）	5 019.861	-139.087 9	-139.753 0
MSK（10）	5 022.93	-143.175 6	-133.445 2
GMSK（10）	5 019.861	-150.536 1	-147.685 9
GMSK（10）	5 022.93	-149.976 8	-138.406 1
BOCs（5，5）	5 019.861	-128.461 1	-156.292 6
BOCs（5，5）	5 022.93	-128.585 2	-140.585 0
OFDM-CPM（10）	5 019.861	-148.886 4	-136.404 5
OFDM-CPM（10）	5 022.93	-149.576 3	-134.872 5
平均差值		-0.929 2	8.418 1

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L/C dual-band navigation signal modulation mode and performance evaluation of BeiDou system

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