北斗系统C波段导航信号调制方式及性能评估

doi:10.12305/j.issn.1001-506X.2022.12.25

Abstract

Abstract:

In view of the strict compatibility constraint requirements of C-band satellite navigation signals, continuous phase modulation based on prolate spheroidal wave functions(CPM-PSWF) is exploratorily applied to C-band navigation. After analyzing the influence of key parameters on the power spectrum characteristics of CPM-PSWF signal, four CPM-PSWF sub-families are initially screened as candidate navigation signals for C-band, and their navigation performance indicators are also evaluated. On the basis of weighing the spectrum compatibility of the C-band signal and various navigation performance indicators, it is proposed to use the CPM-PSWF signal with "QM2PSWF(10) C=6" and h=0.5 as the C-band navigation signal of the BeiDou system. The research shows that compared with the current C-band non-CPM-PSWF candidate navigation signal, the proposed CPM-PSWF signal spectrum leakage is less, the out-of-band attenuation is faster, and the code tracking accuracy and anti-multi-path performance are more competitive.

Key words: C-band navigation, continuous phase modulation based on prolate spheroidal wave functions (CPM-PSWF), compatibility, navigation performance

CLC Number:

V249.3

Yude NI, Ling ZOU, Ruihua LIU, Wantong CHEN, Zhe QIN, Kai WANG. C-band navigation signal modulation mode and performance evaluation of BeiDou system[J]. Systems Engineering and Electronics, 2022, 44(12): 3800-3810.

Figures/Tables 17

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候选信号		OOBE/dBc			PFD/(dBW/m²)
		RAS	上行信号	MLS	RAS	MLS
		载波频率5 019.861/5 022.93 MHz
BPSK(10)		-20.842 5	-16.278 1	-13.517 8	-130.194 6	-148.497 8
BPSK(10)		-21.146 1	-16.842 7	-13.113 9	-130.498 2	-139.234 4
MSK(10)		-29.735 7	-17.640 6	-20.487 6	-139.087 9	-139.753 0
MSK(10)		-33.823 5	-25.582 6	-13.174 3	-143.175 6	-133.445 2
GMSK(10)		-41.222 5	-23.344 2	-25.244 1	-150.574 6	-144.930 7
GMSK(10)		-40.668 7	-28.299 6	-18.683 9	-150.020 8	-135.020 8
QM2RC(10)		-41.215 0	-17.288 8	-20.264 7	-150.567 2	-139.524 8
QM2RC(10)		-44.573 9	-24.363 6	-13.788 1	-153.926 1	-133.850 1
BM2PSWF(20)	C=1	-45.065 8	-27.005 0	-30.370 9	-154.418 0	-148.488 0
	C=1	-45.178 0	-34.352 5	-19.952 6	-154.530 2	-135.740 6
	C=2	-41.060 8	-20.455 1	-22.083 7	-150.413 0	-142.041 7
	C=2	-43.373 4	-24.785 0	-17.166 9	-152.725 6	-135.220 3
QM2PSWF(10)	C=4	-41.266 1	-17.752 5	-20.750 7	-150.618 3	-140.002 1
	C=4	-44.519 9	-24.846 0	-14.179 1	-153.872 1	-134.137 3
	C=6	-35.882 7	-14.685 4	-17.116 7	-145.234 9	-137.213 8
	C=6	-41.882 2	-20.440 6	-11.876 8	-151.234 4	-132.793 7
平均差值		-2.359 4	-5.632 9	5.987 5	-2.358 9	7.626 5

信号类型	接收机带宽为20 MHz对应的Gabor带宽/MHz	Gabor带宽性能排序
BPSK(10)	3.256	8
MSK(10)	4.336	1
GMSK(10)	3.449	6
QM2RC(10)	4.007	3
BM2PSWF(20) C=1	3.428	7
BM2PSWF(20) C=2	3.484	5
QM2PSWF(10) C=4	3.936	4
QM2PSWF(10) C=6	4.297	2

信号类型	平均多径误差峰值/m	抗多径干扰性能排序
BPSK(10)	3.643	8
MSK(10)	2.933	2
GMSK(10)	3.492	6
QM2RC(10)	2.995	3
BM2PSWF(20) C=1	3.533	7
BM2PSWF(20) C=2	3.427	5
QM2PSWF(10) C=4	3.029	4
QM2PSWF(10) C=6	2.865	1

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

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