Compact controlled reception pattern antenna for interference mitigation tasks of global navigation satellite system receivers

Park

Trans. Japan Soc. Aero. S Sci.

2018

As more GPS receivers are used in navigation systems to obtain precise position information, concerns about GPS jamming vulnerability are growing. The most effective way to overcome this jamming weakness is to use an array antenna that consists of many antenna elements and RF channels. However, an array antenna causes two side effects: a nulling pattern and a time delay error in positioning performance. We analyze the effects on the positioning accuracy of a GPS receiver equipped with a precise time-delay-compensated array antenna to overcome jamming situations. We present an analysis of the theoretical gain pattern of a 4-array antenna and experimental verification of GPS signal attenuation by obtaining a satellite's CN 0 value in the near jamming direction. We show the results of the time delay measurement in the array antenna system using two independent methods and present a new baseband linear interpolation algorithm that is evaluated as having a 0.95 ns RMS error after compensating for the invariant RF time delays. Finally, using the realistic gain pattern and time-delay-compensation results, we assess the position error of the GPS receiver and show the possibility of attaining a precise navigation system in jamming environments.

Section: Methodssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Effects on the Positioning Accuracy of a GPS Receiver with Array Antenna and Time Delay Compensation for Precise Anti-Jamming

Park

Trans. Japan Soc. Aero. S Sci.

2018

IEICE Electron. Express

“…Recently, many anti-jamming technology of GNSS receiver mainly focuses on the space, frequency, time domain solution [3,4]. Additional antenna arrays that are assembled at specific locations are needed in the space domain solution to resolve the jamming issues [5,6,7,8], and the estimation of jamming frequency depends on the parameters of ADC in each antenna. However, in practice, the parameters of ADCs in multi-antenna are different, which makes it difficult to estimate the jamming frequencies accurately [9].…”

Section: Introductionmentioning

confidence: 99%

An architecture design for anti-jamming circuit with low power and low area cost in high-precision GNSS receiver chip

Yang

Liu

Chen

2019

In this paper we propose an architecture of the anti-jamming circuit in high precision GNSS receiver chip base on the frequency-time domain solution, at most, the jamming signals of 12 frequency points can be detected and eliminated at the same time. In addition, an jamming detection strategy based on short-long time FFT is proposed and a circuit of FFT engine with low cost is designed to reduce the area and dynamic power of the GNSS receiver chip. Finally, we complete the VLSI design by using 55 nm digital process, the circuit area is 0.082 mm 2 , the average dynamic power is 0.943 mW. The implementation results prove the effectiveness of the proposed anti-jamming circuit.

International Journal of Antennas and Propagation

“…The navigation receivers get the signals with the signal/noise ratio (SNR) is about −30 dB, which makes receivers vulnerable to all kinds of intentional or unintentional interference. The performance of antijamming has become a key indicator in military and some civilian applications [2,3]. According to the number of antennas, the antijamming technology of receivers can be divided into single antenna and antenna arrays, in which the single antenna could only suppress narrowband interference and the antenna arrays could suppress both narrowband and wideband interference [4].…”

Section: Introductionmentioning

confidence: 99%

Impact on Antijamming Performance of Channel Mismatch in GNSS Antenna Arrays Receivers

Nie

Chen

et al. 2016

The performance of antijamming is limited by channel mismatch in global navigation satellite system (GNSS) antenna arrays receivers. Only when the amplitude and phase characteristics of each array channels are the same is the interference likely to be completely suppressed. This paper analyzes the impact on antijamming performance of channel mismatch. We built the model of channel mismatch and derived the impact on transfer function with space-time adaptive processor (STAP) of channel mismatch in theory. The impact factor of channel mismatch is proposed by the fuzzy transfer function, which could directly reflect the antijamming performance under channel mismatch. In addition, every characteristic in the channel mismatch model is analyzed. The analysis results show that the greatest impacts on antijamming performance are the range of amplitude wave and the group delay bias, while the influence of the number of amplitudes is next. As for the effect of group delay fluctuation is the smallest.