Abstract
Ultra-wideband (UWB) pulse signal has an extremely narrow pulse width and wide frequency bandwidth, which overlaps with the operating frequency band of Global Position System (GPS) receivers, posing a potential threat to their performance. In response to this problem, through mathematical analysis and software simulation, the effects of UWB pulse signal under time-hopping-pulse position modulation (TH-PPM) on the performance of GPS receivers were studied. First, the expression and waveform of the UWB pulse signal were analyzed in the time-frequency domain, and it is concluded that the pulse repetition frequency (PRF) mainly affects the discrete spectrum of the UWB signal and the TH code period mainly affects the continuous spectrum. On this basis, the simulation on the power spectral density (PSD) of GPS signal and UWB signal under different pulse parameters was represented, from which a conclusion can be drawn that the PRF is the main factor impacting the PSD of the GPS signal. Furthermore, this paper analyzed the degradation of GPS receiver equivalent carrier-to-noise ratio (C/N0) and C/A code demodulation bit error rate (BER) under UWB interference, which are the crucial evaluating indicators of GPS signal quality. Eventually, we theoretically calculated the minimum interference level of the UWB interference signal to the GPS receiver, providing a theoretical reference for reducing the interference effects of UWB pulse signal on the performance of GPS receivers.
Highlights
In the 1960s, the problem of ultra-wideband radio frequency (UWB RF) signal generation was solved with the numerous efforts of many researchers [1]; with the rapid development of electronic communication technology, the UWB system is gradually used widely in all sorts of fields such as weapons and equipment, navigation, and radar imaging [2, 3]. e UWB system is a major revolution in traditional communication methods, which is different from conventional communication methods based on sinusoidal carrier modulation
After their satellite signals propagate through space, the Discrete Dynamics in Nature and Society signal strength is already very weak when they reach Earth’s surface. e jammer with interference power of 1 W performs noise interference on the Global Position System (GPS) receiver, which can make the GPS receiver within a range of 22 km lose its normal working ability, showing that the GPS signal has an inherent vulnerability. e UWB signal has a very wide spectrum and coverage, whose spectrum energy can fall into the GPS receiver and cause interference to the normal operation of the device. erefore, the study of UWB system interference to GPS has important practical significance
We analyze the influence of different PRFs and TH code periods on the power spectral density (PSD) of UWB signals. On this basis, combining the relationship between the pulse repetition frequency and the bandwidth of GPS spread spectrum system, the equivalent C/N0 and bit error rate (BER) degradation of the receiver are derived with the increase of UWB signal power, calculating the minimum interference level when the UWB signal leads to the tracking loss of the GPS receiver
Summary
In the 1960s, the problem of ultra-wideband radio frequency (UWB RF) signal generation was solved with the numerous efforts of many researchers [1]; with the rapid development of electronic communication technology, the UWB system is gradually used widely in all sorts of fields such as weapons and equipment, navigation, and radar imaging [2, 3]. e UWB system is a major revolution in traditional communication methods, which is different from conventional communication methods based on sinusoidal carrier modulation. Existing studies have shown that the ultra-wide spectrum characteristics of UWB pulse signals will still cause degradation of the functions of existing frequency-using systems, especially for GPS signals whose power is much lower than the noise floor, extremely vulnerable to the RF interference [4,5,6,7]. We analyze the influence of different PRFs and TH code periods on the PSD of UWB signals On this basis, combining the relationship between the pulse repetition frequency and the bandwidth of GPS spread spectrum system, the equivalent C/N0 and BER degradation of the receiver are derived with the increase of UWB signal power, calculating the minimum interference level when the UWB signal leads to the tracking loss of the GPS receiver. Effective measures are proposed to provide a reference for suppressing the interference of the UWB pulse signal with the GPS signal
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