Assessment and analysis of radio frequency compatibility among several global navigation satellite systems

Liu, Wei; Zhai, Chunxue; Zhan, Xingqun; Zhang, Y.H.

doi:10.1049/iet-rsn.2009.0241

Cited by 12 publications

(14 citation statements)

References 1 publication

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“…Suppose the effect of filtering within the pass band and other aspects of receiver processing losses can be neglected, the calculation for the aggregate equivalent noise power density of the sum of intrasystem and intersystem interference when a receiver at a given location on the earth in view at any time over a satellite period can be defined as [9]: Ct is the received power of thej th interfering signal on thei th satellite and it can be written as [9] , ,…”

Section: Equivalent Noise Power Densitymentioning

confidence: 99%

“…Define the earth radius e R , the satellite elevation angle el and the satellite semi-major axis SV R at the user receiver, the off-boresight angle  can be defined as [9] 1 sin( 90 ) sin When more than two systems are operating together in the same band, the aggregate equivalent noise power density denoted as I that is the sum of two components…”

Section: Ltmentioning

confidence: 99%

“…Due to the space constellations for C band have not be set, suppose the space constellations of BeiDou, GPS and Galileo systems still use those of L band and the corresponding parameters [9] are shown in Table 4.…”

Section: A Space Constellations and Simulation Parametersmentioning

confidence: 99%

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MSK-BCS Modulation for GNSS Radio Frequency Compatibility in C Band

Liu

Zhan

Li³

et al. 2014

JNW

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Due to insufficient Radio Navigation Satellite Service (RNSS) portion of Radio Frequency (RF) spectrum for many services that are being planned for the future on L band where has come up a frequency overlapping situation, C band as an alternative spectral allocation has already been proposed in the previous years. The future C band signals could make use of the frequency band between 5010MHz and 5030MHz, offering a narrow bandwidth of 20 MHz. The main goal of C band signal design aims at having band limited signals. Consequently, it should be designed with a view to compatibility in band and the power emissions out of band. The Minimum Shift Keying(MSK) modulation is investigated to provide constant envelope and a good spectrum confinement, furthermore, a Binary Coded Symbol (BCS) modulation based on MSK pulse that has sharper autocorrelation, larger Gabor bandwidth, smaller Cramé rRao Lower Bound and less multipath error has been presented by Liu. Suppose spread interoperability signals employing the BCS modulation based on MSK pulse for Global Navigation Satellite System (GNSS) in C band with only a narrow bandwidth of 20MHz. Simulation results reveal the interference for the receiver prompt correlator channel processing and code tracking induced by navigation satellite system to each other. The result can be significant for the future signal design in C band.

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Section: Equivalent Noise Power Densitymentioning

confidence: 99%

Section: Ltmentioning

confidence: 99%

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MSK-BCS Modulation for GNSS Radio Frequency Compatibility in C Band

Liu

Zhan

Li³

et al. 2014

JNW

View full text Add to dashboard Cite

show abstract

“…Joint data/pilot acquisition strategies can be adopted to increase the sensitivity [12,13]. The new and modernised GNSS navigation systems will provide various navigation services and signals for civil user [14] and it makes the combination of different satellite systems possible to improve the precision of the receiver [15,16]. Coupling satellite systems with assisted or terrestrial positioning systems is also an effective method to improve the acquisition performance in weak signal environments [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Weak global navigation satellite system signal acquisition with bit transition

Zhu

Fan

2015

IET Radar, Sonar & Navigation

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This study analyses the bit transition and integration over multiple code periods in weak global navigation satellite system signal acquisition. Bit transition must be considered in weak signal environments as it causes a correlation peak splitting reducing the correlation gain. In this study, a modified time parallel acquisition (MTPA) scheme is designed to solve the bit transition problem, and different accumulation schemes over multiple code periods are proposed to detect weak signals. Especially, a fast Fourier transform-based symbol combination for bit transition algorithm, which is suitable for the MTPA scheme, is presented in order to accelerate the coherent accumulation. Simulation results, along with the receiver operative characteristic curves, are presented to verify the performance of the MTPA and accumulation algorithms.

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“…Owing to the merits such as lower interference [1,2], better spatial reuse, longer transmission range [3], and improved network capacity [4,5], the adaptive digital beamforming (ADBF) has been studied in various of areas. Radio interference suppressing ability is the key advantage of adaptive arrays, especially for the strong radio frequency interference in the same frequency band and has been applied extensively in global navigation satellite system (GNSS) receivers for the severe electromagnetic environment [6,7]. Besides, with the fast development of wireless communications and networks, the spectrum resource is becoming deficient [8], and the adaptive array is effective in increasing the network capacity by employing a new access technique: space division multiple access [9].…”

Section: Introductionmentioning

confidence: 99%

A dense overlapped linear subarray architecture for interference suppressing in small‐scale arrays

Liu

Meng

Han

2014

Int J Communication

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Compared to omnidirectional antennas, smart antenna arrays are qualified such advantages as lower interference and better spatial reuse. As developed from large-scale phased array radar, subarray technology is a key approach to reduce the computational complexity, and a quantity of algorithms for subarray partition and low sidelobe has been studied and applied in radar system. With the development of hardware manufacture, portability and mobility are the trend of devices, which limit the array aperture and number of elements, and the performances are constrained by elements number. This paper proposes a dense overlapped subarray architecture for linear array when elements number is small, to improve the array gain and output signal to interference plus noise ratio, and different weighting mode is employed at element and subarray level for adaptive digital beamforming to obtain special performances. The subarray partition is presented for the linear array, which keeps the spacing at subarray level half wavelength to avoid grating lobes and nulls, and the simulation results demonstrate that the subarray architecture induces better output signal to interference plus noise ratio; meanwhile, the computational amount is reduced.in which s 0 .t / is the signal component and s i+n .t / is the interference plus noise component, then the equation earlier is expanded asP j a.Â j /s j .t / C n.t /where n(t ) is the noise vector composed of the Gaussian noise received in each element.

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Assessment and analysis of radio frequency compatibility among several global navigation satellite systems

Cited by 12 publications

References 1 publication

MSK-BCS Modulation for GNSS Radio Frequency Compatibility in C Band

MSK-BCS Modulation for GNSS Radio Frequency Compatibility in C Band

Weak global navigation satellite system signal acquisition with bit transition

A dense overlapped linear subarray architecture for interference suppressing in small‐scale arrays

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