In this paper, we discuss a method to protect satellite signals from strong time-varying interferers. Time-domain, transform-domain, and space-domain algorithms have been widely used for interference suppression. Howe...
详细信息
In this paper, we discuss a method to protect satellite signals from strong time-varying interferers. Time-domain, transform-domain, and space-domain algorithms have been widely used for interference suppression. However, when used under high dynamic conditions, these methods cause serious suppression of satellite signals in the GPS receivers along with inhibiting interferers. To address this problem, we optimize the satellite and interference steering vectors using a multi-star forming approach to distinguish satellite signals and strong interferers. In order to detect time-varying interferers, we further introduce a novel hidden Markov model (HMM), and power inversion (pi) and multi-star interference suppressed (multi-pi) model anti-interference synthesis scheme.A bank of HMM filters are operated to track the on-off interferers in the frequency domain, and decide if an anti-interference algorithm needs to be used. After HMM, the multi-pi algorithm is implemented to inhibit broadband interferers. The experimental results show that our novel scheme adapts quickly when tracking time-varying interferers and protects GPS signals from losses.
In this paper, we discuss how to protect satellite signals from strong interference signals The power inversion (pi) algorithm has been widely used in interference suppression. However, both the interference and the s...
详细信息
ISBN:
(纸本)9781509048281
In this paper, we discuss how to protect satellite signals from strong interference signals The power inversion (pi) algorithm has been widely used in interference suppression. However, both the interference and the satellite signals are significantly suppressed. Therefore, we further optimized the satellite steering vector and interference steering vector using a multi-star, forming pi approach. To verify the superiority of the new method, we designed an anti-interference hardware platform that includes a seven-element antenna array, a radio frequency (RF) front-end module, a field-programmable gate array (FPGA), and a digital signal processor (DSP)to compare the two algorithms. Using the hardware platform, we compare the traditional pialgorithm to our proposed optimized algorithm using the following three metrics: simulation waveform, direction of arrival (DOA), and positioning. The results show that our method can suppress interference from satellites, resulting in better efficiency than the pialgorithm.
暂无评论