DOT GPS Adjacent Band Compatibility Assessment Test Results

Mackey, Stephen; Wassaf, Hadi; Dyke, Karen Van; Hegarty, Christopher; Shallberg, Karl; Flake, John; Johnson, Terence

doi:10.33012/2017.14921

Cited by 4 publications

(3 citation statements)

References 0 publications

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“…In studies on navigation receivers, the C/N0 [26,27] is always used as the sensitivity criterion for the satellites' loss of lock. In the test, a certain type of navigation signal simulator is utilized to generate navigation signals, and the transmitting power is set as −90 dBm and −110 dBm, respectively.…”

Section: Sensitivity Phenomenon and Criterion On Navigation Receivermentioning

confidence: 99%

Sensitivity Criterion and Law on a Navigation Receiver under Single Frequency Electromagnetic Radiation

Wei

2021

Applied Sciences

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To objectively assess the anti-electromagnetic interference ability of the navigation receiver, the sensitivity criterion of a certain type of navigation receiver is tested under single-frequency continuous wave electromagnetic radiation with an optimized testing method. The experimental results show that it is difficult to guarantee the accuracy of the measurement value of the sensitivity level by using the carrier-to-noise density ratio (C/N0) as the sensitivity criterion, but the initial C/N0 of each satellite can be used as the basis for identifying whether the navigation system has recovered from the interference. The experimental error is dramatically decreased when the sensitivity criterion of “the sensitive phenomenon appears within the first 4 s, and the loss of positioning lasts for 30 s” is employed, the variable interference power step size is adopted and all of the satellites C/N0 are required to recover to the initial value after an interference. The critical interference field intensity error can be controlled within 1 dB by using all these measures. The sensitivity law of the navigation receiver is the same under different working signal intensities. It is significantly sensitive in the working frequency bandwidth. It is also quite sensitive in −11.5 MHz~55.5 MHz of the frequency offset range. The positive sensitive bandwidth is about 5 times that of the negative sensitive bandwidth.

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Section: Sensitivity Phenomenon and Criterion On Navigation Receivermentioning

confidence: 99%

Sensitivity Criterion and Law on a Navigation Receiver under Single Frequency Electromagnetic Radiation

Wei

2021

Applied Sciences

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“…Generally, the core satellite systems include the Global Positioning System (GPS) of United States, GLObal NAvigation Satellite System (GLONASS) of Russia, Galileo of European Union, BeiDou Navigation Satellite System (BDS) of China, NAVigation with Indian Constellation (NavIC) of India, and Quasi-Zenith Satellite System (QZSS) of Japan. Typically, the raw C/N0 values with the internal interferences range from 40 to 50 decibel-Hertz (dB-Hz) depending on the thermal noises of the antenna and receiver hardware, and they can be reduced by the external RFI and jamming (Borio D et al 2016;Mackey S et al 2017;Paziewski J et al 2019). Exactly, the affected GNSS receivers below 40 dB-Hz can degrade the user positioning accuracy, continuity, and integrity (Idris A N et al 2013(Idris A N et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis and Effects of Radio Frequency Interference in GPS Signal Quality in Thailand

Sophan,

Supnithi,

Myint

et al. 2024

Preprint

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The radio frequency interference (RFI) in global navigation satellite system (GNSS) signals has recently received much attention in the GNSS community because of frequent jamming issues. The carrier-to-noise density ratio (C/N0) is one of the common parameters to indicate the signal quality. In this work, we aim to analyze the occurrences of local RFI effects in areas surrounding the Suvarnabhumi International Airport as well as remote areas. Specifically, the percentage of RFI levels and raw C/N0 values are analyzed based on the modified RFI detection. The estimated RFI values are created from the raw C/N0 data, followed by the RFI levels generated by the empirical data. We validate the modified RFI detection by using the GNSS reference stations at the urban, suburban, and outside the capital city in Thailand. The user positioning errors with the high (severe) RFI levels are investigated based on the single point positioning (SPP) and real-time kinematics (RTK). From the experimental simulations, the high RFI levels at the urban are higher than those at the suburban. As expected, the statistical analysis covering COVID-19 (2019 to 2023) shows that the high RFI levels in June 2023 (post COVID-19) are more than those in June 2020 and 2021 (lockdown COVID-19) about twofold. Additionally, the SPP and RTK errors with the medium/high RFI levels have the error spikes in the centimeter to meter levels. The RTK performance with the fixed status can be affected and then returned to the float status as well.

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“…The interference from DVB-T results in carrier-to-noise ratio (C/N 0 ) degradation which may cause problems in lock detection [9], [10]. The effects of interference from the closest LTE band 24 to GPS receivers have been measured and reported in [11]- [13]. The adjacent band LTE interference causes C/N 0 degradation, increased pseudorange standard deviation, position errors, and increased time-to-fix.…”

Section: Introductionmentioning

confidence: 99%

Measured GPS performance under LTE-M in-device interference

Apilo

Hiivala

Kuosmonen

et al. 2018

2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC)

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In this paper we present the measurement results for time-to-fix, position accuracy, and carrier-to-noise ratio of commercial Global Positioning System (GPS) receivers under the in-device interference from an LTE-M transmitter. The laboratory measurement set-up is built using software-defined radio (SDR) platforms to conductively feed emulated GPS L1 signals and LTE-M interference signals to the antenna input of the GPS receivers. The LTE-M interference from second harmonics is accurately modelled taking into account the transmitter activity patterns in different coverage enhancement modes. According to measurements, there are large variations in interference tolerance between different GPS receivers. REC01 was able to tolerate high level of interference during tracking and also in acquisition as long as the interference pulse duration is not too long (tens of milliseconds). REC02 performed clearly worse and tolerated only low levels of LTE-M interference during both acquisition and tracking. The same measurement set-up can be used with any GPS receiver for designing proper isolation and filtering levels for co-existing LTE-M transmitters.

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DOT GPS Adjacent Band Compatibility Assessment Test Results

Cited by 4 publications

References 0 publications

Sensitivity Criterion and Law on a Navigation Receiver under Single Frequency Electromagnetic Radiation

Sensitivity Criterion and Law on a Navigation Receiver under Single Frequency Electromagnetic Radiation

Statistical Analysis and Effects of Radio Frequency Interference in GPS Signal Quality in Thailand

Measured GPS performance under LTE-M in-device interference

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