Optimal Order of Time-Domain Adaptive Filter for Anti-Jamming Navigation Receiver

Abstract

Adaptive filtering algorithms can be used on the time-domain processing of navigation receivers to suppress interference and maintain the navigation and positioning function. The filter length can affect the interference suppression performance and hardware utilization simultaneously. In practical engineering, the filter length is usually set to a large number to guarantee anti-jamming performance, which means a high-performance receiver requires a high-complexity anti-jamming filter. The study aims at solving the problem by presenting a design method for the optimal filter order in the time-domain anti-jamming receiver, with no need for detailed interference information. According to interference bandwidth and jam-to-signal ratio (JSR), the approach designed a band-stop filter by Kaiser window for calculating the optimal filter order to meet interference suppression requirements. The experimental results show that the time-domain filtering processing has achieved good interference suppression performance for engineering requirements with optimal filter order in satellite navigation receivers.

Suppression of Jammer Multipath in GNSS Antenna Array Receiver

“…For military or core civilian areas, anti-jamming performance is an important indicator to evaluate the navigation receivers [7,8]. The interference cancellation technology with antenna array is a common technology for a user terminal because it not only can suppress narrowband interference, but can also suppress wideband interference [9][10][11][12]. The navigation in the transmission process would encounter dense forests or urban canyons, but the interference transmission would encounter the same situation [13].…”

A new blind anti‐jamming algorithm based on a novel antenna array design

“…Global Navigation Satellite System (GNSS) technology has been applied to almost all infrastructure and livelihood facilities in recent decades. In particular, the key infrastructure such as transportation, communication, power, and economic and financial systems urgently require accurate positioning and timing services from GNSS [1][2][3]. However, the received GNSS signals are weak and vulnerable enough to be susceptible to intentional or unintentional radio frequency interference (RFI), so next-generation technology that guarantees accuracy and reliability has become a focus of attention.…”

Performance analysis of repeater spoofing suppression based on GNSS multi-beam receiver

“…With the rapid development of satellite navigation technology, satellite navigation systems have gradually expanded from the military field to the civilian field, penetrated into all sectors of the national economy, and become an important part of the national PNT (Positioning, Navigation and Timing) system [1][2][3]. And with the concept of Navigation Warfare (NAVWAR) proposed [4], the research on satellite navigation system jamming and anti-jamming technology is receiving a growing number of attention, according to different processing domains, anti-jamming can be carried out from timefrequency domain [5,6], spatial domain [7,8] and mixed domain, among which the airspace anti-jamming using beamforming technology is currently the most effective [9,10]. The multi-beam anti-jamming receiver is a GNSS receiver that uses the spatial antijamming technology in the front end.…”