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

Lu, Zukun; Nie, Junwei; Chen, Feiqiang; Ou, Gang

doi:10.1155/2016/1909708

Cited by 12 publications

(9 citation statements)

References 14 publications

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“…This literature points out that the interference multipath will affect the signal to interference plus the noise ratio (SINR) of the array output, and it also indicates that the effect of interference multipath could be suppressed by space-time adaptive processing (STAP). In the field of navigation, the literature [17] and [18] demonstrated by simulation that jammers and jammer multipath can be cancelled using an adaptive space-time array, leading to nearly ideal GPS performance. The current research results show that STAP can suppress the interference multipath, but this research still remains on the basis of simulation and experiment and has not pointed out the reason and essence.…”

Section: Array Modelmentioning

confidence: 99%

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Huang

Xiao

et al. 2022

Remote Sensing

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Interference multipath is an important factor to affect the anti-jamming performance for the global navigation satellite system (GNSS) antenna array receiver. However, interference multipath must be considered in practical application. In this paper, the antenna array model for interference multipath is analyzed, and an equivalent model for interference multipath is proposed. According to the equivalent interference multipath model, the influence of interference multipath on anti-jamming performance is analyzed from the space only processing (SOP) and space-time adaptive processing (STAP). Interference multipath can cause loss of the degree of freedom (DoF) of SOP. Through analysis of the equivalent model and STAP mechanism, it further reveals how the STAP can solve the interference multipath. The simulation experiments prove that the equivalent model is effective, and the analysis conclusion is correct. This paper also points out that the interference bandwidth is wider and more taps in STAP are required, under the same experiment conditions.

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Section: Array Modelmentioning

confidence: 99%

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Huang

Xiao

et al. 2022

Remote Sensing

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“…The anti-jamming technologies comprise the time/frequency domain anti-jamming technology, based on a single antenna, and space-domain anti-jamming technology, based on the antenna array [12,13]. Space-domain anti-jamming technology can also be combined with other domain algorithms to form space-time and space-frequency technology.…”

Section: Introductionmentioning

confidence: 99%

“…However, satellite navigation signals are usually in the L-band. Ground air traffic radars, active earth exploration satellites, satellite-toground mobile communication satellites, and aviation radio navigation, among others, are also in this frequency band [13,[21][22][23]. If the same frequency is used between different systems, there will be mutual interference between the different systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of sweep interference on satellite navigation time-domain anti-jamming

Qiao

et al. 2023

Front. Phys.

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The global navigation satellite system (GNSS), represented by global positioning systems (GPS), is widely used in various civil and military fields and represents an essential basis for space-time information services. However, the radar signals partially overlap with the frequency band of satellite navigation signals, seriously affecting the normal reception of weak satellite navigation signal power. To further improve anti-jamming with sweep interference in the time domain, this paper focuses on the sweep interference scenario, studies the influence of the sweep interference on time-domain-adaptive anti-jamming, and proposes a timing reset based on the adaptive filter. The proposed method can effectively deal with the influence of sweep interference on time-domain-adaptive anti-jamming and can suppress interference and protect signals at the same time. Simulation experiments verify the effectiveness of the anti-jamming method proposed in this paper. Under the typical simulation scenarios, the influence time of the frequency sweep interference on the navigation signal is less than 1 m when the timing reset period is 1 m, which is significantly reduced compared to traditional methods. The proposed anti-jamming method is of great significance for improving the survivability of satellite navigation receivers in sweep interference scenarios.

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“…CRPA arrays can provide beam forming/null steering in specific direction by adaptively adjusting the weight of each antenna element. Typically, an adaptive finite impulse response (FIR) filter placed behind each element allows a better performance of antijamming, which is known as the space-time array processing [1]. CRPA arrays especially STAP-based antenna arrays are so popular that numerous adaptive algorithms have been researched to provide a high performance of interference suppression [2].…”

Section: Introductionmentioning

confidence: 99%

“…The measurements are distorted further in STAP because of the applied FIR filters [5,7]. In [1], the dependency of bias on interference circumstances is analyzed, which leads to the unpredictable characteristic of STAP-based bias.…”

Section: Introductionmentioning

confidence: 99%

The Unbiased Characteristic of Doppler Frequency in GNSS Antenna Array Processing

Xie

Chen

et al. 2019

International Journal of Antennas and Propagation

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The antenna array technology, especially the spaced-time array processing (STAP), is one of the effective methods used in Global Navigation Satellite System (GNSS) receivers to refrain the power of jamming and enhance the performance of receivers in the circumstance of interference. However, biases induced to the receiver because of many reasons, including characteristic of antennas, front-end channel electronics, and space-time filtering, are extremely harmful to the high precise positioning of receivers. Although plenty of works have been done to calibrate the antenna and to mitigate these biases, achieving a good performance of antijamming, high accuracy, and low complexity at the same time still remains challenging. Different from existing works, this paper leverages the characteristic of GNSS signal’s Doppler frequency in STAP, which is proven to remain unbiased to solve the problem, even when the nonideal antennas are used and the interference circumstance changes. Since the integration of frequency is carrier phase, the unbiased Doppler frequency leads to an accurate estimation of carrier phase which can be used to calibrate the antenna array without extra apparatus or complicating algorithms. Therefore, a simple Doppler-aid strategy may be developed in the future to solve the difficulty of STAP bias mitigation.

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

Cited by 12 publications

References 14 publications

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

Influence of sweep interference on satellite navigation time-domain anti-jamming

The Unbiased Characteristic of Doppler Frequency in GNSS Antenna Array Processing

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