Measured Effects of a Narrowband Interference Suppressor on GPS Receivers

Capozza, Paul T.; Holland, B. J.; Hopkinson, T. M.; Li, C.; Moulin, Daniel De; Pacheco, Peter; Rifkin, R.

doi:10.21236/ada460171

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…49, No. 3 Progri et al: An Investigation of a GPS Adaptive Temporal Selective Attenuator 143 undesired signal level are both set to a power level of 0 dB. This shows that the ATSA has difficulty driving an undesired signal below the noise level.…”

Section: Examplementioning

confidence: 99%

“…In one implementation of this technique, two such suppressors are integrated inside a Paradigm chip (developed by Javad Positioning Systems), along with 40 universal GPS-GLONASS channels and spread-spectrum radio modems to suppress up to six in-band interference sources [2]. Another narrowband interference suppressor technology is based on frequency domain excision [3].…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of a GPS Adaptive Temporal Selective Attenuator

et al. 2002

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A GPS adaptive temporal selective attenuator (ATSA) can be used to suppress the effects of undesired narrowband signals. A GPS ATSA can be modeled as a discrete finite impulse response (DFIR) filter, where the filter's impulse response coefficients can be selected by minimizing the undesired signal over desired signal ratio (UDR). The UDR, which directly represents the GPS ATSA performance, depends on the filter size, the temporal delay, the sampling frequency, and the desired signal frequency. A methodology for properly selecting the temporal delay and the sampling frequency for a given filter size and desired signal frequency is analyzed and simulated. The analysis and simulation results are validated using an implementation of an example ATSA on the TI C6711 digital signal processor (DSP). For a given GPS ATSA architecture (i.e., a given desired signal frequency and sampling frequency), optimum tap spacing can be selected, regardless of the jammer frequency. Some of the lessons learned during this investigation could be particularly valuable for ATSAs or analogous systems that will operate on the L5 frequency.

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Section: Examplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Investigation of a GPS Adaptive Temporal Selective Attenuator

et al. 2002

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“…The monitoring indicators include the quantization weight gain of the A/D converter [4], power spectral, AGC (automatic gain control) [5] carrier to noise ratio [6], the correlator output [7], etc. This method requires a monitoring threshold, which is usually derived from the corresponding characteristic of the GNSS signals without interference.…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Interference Monitoring Technique for GNSS Based on a Twin Support Vector Machine Method

Huang

Lang

et al. 2016

Sensors

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Interferences can severely degrade the performance of Global Navigation Satellite System (GNSS) receivers. As the first step of GNSS any anti-interference measures, interference monitoring for GNSS is extremely essential and necessary. Since interference monitoring can be considered as a classification problem, a real-time interference monitoring technique based on Twin Support Vector Machine (TWSVM) is proposed in this paper. A TWSVM model is established, and TWSVM is solved by the Least Squares Twin Support Vector Machine (LSTWSVM) algorithm. The interference monitoring indicators are analyzed to extract features from the interfered GNSS signals. The experimental results show that the chosen observations can be used as the interference monitoring indicators. The interference monitoring performance of the proposed method is verified by using GPS L1 C/A code signal and being compared with that of standard SVM. The experimental results indicate that the TWSVM-based interference monitoring is much faster than the conventional SVM. Furthermore, the training time of TWSVM is on millisecond (ms) level and the monitoring time is on microsecond (μs) level, which make the proposed approach usable in practical interference monitoring applications.

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“…Therefore, in this study, a small GNSS receiver with an embedded interference suppression function based on the implementation of the temporal/FFT domain filter using the Overlapped FFT (OFFT) method was designed and manufactured so that it could be operated in a high mobility environment, and the performance was verified through an experiment. In a high mobility environment where narrowband interference signals are present, a matched filter type fast acquisition (FA) technique and a high sensitivity multimode correlator technique for fast acquisition and tracking of satellite signals and a frequency domain signal processing technique for narrowband interference suppression were applied (Capozza et al 1999). A scenario for high mobility condition and narrowband interference environment was made using a GNSS simulator and a signal generator, and the signal acquisition time, navigation accuracy, sensitivity, and the narrowband interference suppression performance were examined.…”

mentioning

confidence: 99%

The Design of a Small GNSS Receiver with Enhanced Interference Suppression Capability for High Mobility

Park¹,

Moon²,

Shin³

et al. 2015

Journal of Positioning, Navigation, and Timing

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With the expansion of the application range of a Global Navigation Satellite System (GNSS) receiver, a GNSS receiver has been used as a navigation system for diverse means of transportation (e.g., automobile, ship, and aircraft), and has also been used as a time and frequency synchronization system for various communication systems (e.g., smartphone) or electric power systems. In addition, the application range includes various military weapon systems that require high precision time, frequency, and navigation such as military communication system and precision guided munition. Recently, a GNSS receiver is also

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Measured Effects of a Narrowband Interference Suppressor on GPS Receivers

Cited by 12 publications

References 2 publications

An Investigation of a GPS Adaptive Temporal Selective Attenuator

An Investigation of a GPS Adaptive Temporal Selective Attenuator

A Real-Time Interference Monitoring Technique for GNSS Based on a Twin Support Vector Machine Method

The Design of a Small GNSS Receiver with Enhanced Interference Suppression Capability for High Mobility

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