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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->卫星导航]]></title>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Overview of GNSS/INS ultra-tight integrated navigation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[GNSS/INS ultra-tight integrated navigation system has become a research hotspot in the field of integrated navigation due to its high positioning accuracy, excellent dynamic performance and strong anti-jamming ability. The principle of GNSS/INS ultra-tight integration was introduced, and the advantages and features of ultra-tight integration mode relative to other integration modes were compared based on the analysis of the technical principle. The domestic and international research status was introduced, represented by ultra-tight integration under high dynamics and MIMU/GNSS ultra-tight integration. The key technologies such as fault-tolerant control technology, neural network assistance, and multi-sensor assisted ultra-tight integration were summarized, and the prospect of GNSS/INS ultra-tight integration towards low cost, high precision and strong stability was prospected.]]></description>
<pubDate>2023/9/26 0:00:00</pubDate>
<category><![CDATA[卫星导航]]></category>
<author><![CDATA[NI Shaojie, LI Shiyang, XIE Yuchen, DENG Ding]]></author>
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<atom:name>NI Shaojie, LI Shiyang, XIE Yuchen, DENG Ding</atom:name>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence analysis of filter order on time-domain interference suppression of navigation receiver]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Filter order is the core parameter affecting the time-domain adaptive anti-jamming performance and the computational complexity of satellite navigation receivers. In order to solve the problem that the current order selection is heavily dependent on engineering experience and the impact of the analysis is insufficient, the impact of the filter order on the time-domain adaptive anti-jamming performance of navigation receivers was analyzed, providing theoretical research for low-complexity time-domain anti-jamming. The analysis was oriented to different interference environments. The filter amplitude-frequency response and the signal carrier-to-noise ratio were used as evaluation indicators. The simulation experiments and practical tests verified the traditional LMS(least mean square) algorithm and the improved LMS algorithm. Finally, an adaptive design method for optimal filter order based on digital filter was proposed. Experimental data analysis shows that the anti-interference performance of the time-domain adaptive filter can be effectively improved by appropriately increasing the filter length. In practical applications, the filter order can be optimized by constraining the carrier-to-noise ratio loss.]]></description>
<pubDate>2023/9/26 0:00:00</pubDate>
<category><![CDATA[卫星导航]]></category>
<author><![CDATA[SUN Guangfu, SONG Jie, LU Zukun, LI Baiyu, XIAO Zhibin, GUO Haiyu]]></author>
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<atom:name>SUN Guangfu, SONG Jie, LU Zukun, LI Baiyu, XIAO Zhibin, GUO Haiyu</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305007]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Effect of signal power enhancement on the performance of GNSS null-steering anti-jamming receiver]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Due to the low transmitting power and large transmission loss, the satellite signal reaching the GNSS receiver is extremely weak, and easy to be interfered. In order to deal with the threat of electromagnetic interference, taking measures at both the system and user level would be a good choice. A model for analyzing the interference suppression capability of anti-jamming receiver with null-steering antenna was established, and the improvement effect of signal power enhancement on the interference suppression performance was quantitatively analyzed. Results show that, the interference mitigation capability of the receiver can be improved by 3～4 dB per 10 dB signal power enhancement. However, from the perspective of improving the receiver′s reception performance(carrier to noise ratio, ranging and positioning accuracy, etc.) under non limiting conditions, when the signal power is increased by 15～20 dB, the reception performance is optimal. The research result can guide the optimization of the signal power enhancement and anti-jamming design of receivers.]]></description>
<pubDate>2023/9/26 0:00:00</pubDate>
<category><![CDATA[卫星导航]]></category>
<author><![CDATA[CHEN Feiqiang, SUN Yifan, TANG Xiaomei, OU Gang]]></author>
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<atom:name>CHEN Feiqiang, SUN Yifan, TANG Xiaomei, OU Gang</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305008]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design of ultra-tight coupling GNSS receiver tracking loop in spinning vehicle]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The spinning vehicles are typical applications of GNSS (global navigation satellite system) receivers. When the GNSS carrier spins, the rotation will introduce higher order dynamics making the traditional tracking loop out of lock. Coupling with the INS (inertial navigation system) can effectively compensate the high order dynamic of signal carrier phase. In this case, a design of ultra-tight coupling GNSS tracking loop, which used the solutions of INS to aid the tracking of GNSS signal, was proposed. Besides, the relationship among the aiding rate of INS, the angular rate of spinning vehicle and the error of signal carrier phase was also analyzed. The simulation results show that the proposed tracking loop structure can effectively deal with the problem of signal tracking in the spinning vehicle, and significantly enhance the precision of position compared to the single GNSS navigation results.]]></description>
<pubDate>2023/9/26 0:00:00</pubDate>
<category><![CDATA[卫星导航]]></category>
<author><![CDATA[XIE Yuchen, LIU Yingxiang, CHEN Feiqiang, WANG Feixue]]></author>
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<atom:name>XIE Yuchen, LIU Yingxiang, CHEN Feiqiang, WANG Feixue</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305009]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Clustering sparse fitting scheme for GNSS multipath channel simulation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A GNSS multipath channel sparse fitting scheme based on K-medoids clustering was proposed to tackle the problem of a large amount of simulation computation and hardware resource overhead for GNSS channels, which is inconvenient for real-time performance evaluation and practical engineering applications. The equivalent reduced CIR (channel impulse response) parameters were extracted using a sparse fitting method based on K-medoids clustering CIR parameters extraction, and the channel simulation was realized using a sparse tapped-delay-line structure. The proposed method sparsely fits the original GNSS multipath channel model under the constraint of retaining multipath error by employing tapped-delay-line structure filter with fewer taps, which can decrease the complexity of simulation without requiring huge hardware resources. Simulation results show that the proposed scheme is effective by sparse fitting the CIR parameters generated by the reference channel model.]]></description>
<pubDate>2023/9/26 0:00:00</pubDate>
<category><![CDATA[卫星导航]]></category>
<author><![CDATA[ZHOU Shun, OU Gang, TANG Xiaomei]]></author>
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<atom:name>ZHOU Shun, OU Gang, TANG Xiaomei</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305010]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Carrier phase tracking loop for long update period satellite navigation signal suitable for GPU processing]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In view of the contradiction that the GPU processing efficiency was limited under the short update interval and the traditional tracking loop was not robust under the high dynamic scenario under the long update interval, a carrier phase tracking algorithm with long update period for high dynamic scenes was proposed. A low complexity LFM signal parameter estimation algorithm was designed to estimate Doppler and its rate of change at the initial stage of tracking, thereby eliminating most signal dynamics, and during the tracking process, a 4-order Kalman filter was used to precisely track the residual signal phase and dynamic. It is verified by simulation that under the 200 ms update interval, fast and stable tracking of the carrier phase can be realized in sinusoidal motion scenes with Doppler primary/secondary change rates of 800 Hz/s and 64 Hz/s<sup>2</sup>, respectively. The convergence can be achieved with only one update, and the tracking sensitivity is as low as 23 dB-Hz; the phase tracking accuracy is far better than the traditional third-order phase locked loop.]]></description>
<pubDate>2023/9/26 0:00:00</pubDate>
<category><![CDATA[卫星导航]]></category>
<author><![CDATA[XIAO Zhibin, LU Zukun, LIN Honglei, HUANG Long]]></author>
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<atom:name>XIAO Zhibin, LU Zukun, LIN Honglei, HUANG Long</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305011]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
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<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Low-complexity fast frequency-sweep interference mitigation method for satellite navigation receivers]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305012]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A low-complexity method based on pulse blanking for fast frequency-sweep interference mitigation in satellite navigation receivers was proposed. Different from traditional methods based on time-frequency analysis, this method converted the continuous wave interference into pulse interference through a low-pass filter, and then pulse detection and blanking were used to mitigate the interference. The interference was blanked as a pulse when it located in the pass-band of the low-pass filter. Otherwise, it was suppressed as an out-band interference when it located in the stop-band of the low-pass filter. Theoretical analysis and experimental results show that the computation complexity of this method is reduced by an order of magnitude compared with that of traditional method, and it can achieve similar interference suppression performance.]]></description>
<pubDate>2023/9/26 0:00:00</pubDate>
<category><![CDATA[卫星导航]]></category>
<author><![CDATA[CHEN Feiqiang, LIU Zhe, HUANG Long, LU Zukun]]></author>
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<atom:name>CHEN Feiqiang, LIU Zhe, HUANG Long, LU Zukun</atom:name>
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<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/202305012]]></guid><cfi:id>1</cfi:id><cfi:read>true</cfi:read></item>
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