一種基于通信衛(wèi)星信號(hào)轉(zhuǎn)發(fā)的衛(wèi)星導(dǎo)航信號(hào)增強(qiáng)方法
doi: 10.11999/JEIT140672 cstr: 32379.14.JEIT140672
基金項(xiàng)目:
中國航天科技集團(tuán)公司衛(wèi)星應(yīng)用研究院創(chuàng)新基金(20121512)，國家重大儀器設(shè)備開發(fā)專項(xiàng)子項(xiàng)目(2013YQ20060707)和國家自然科學(xué)基金(61172078)資助課題
A Method for the Navigation Satellite Signal Enhancement Based on the Signal Retransmission by the Communication Satellite
-
摘要: 該文提出一種利用地球同步軌道(GEO)通信衛(wèi)星信號(hào)轉(zhuǎn)發(fā)實(shí)現(xiàn)衛(wèi)星導(dǎo)航信號(hào)增強(qiáng)的方法。在信號(hào)發(fā)射端，利用衛(wèi)星導(dǎo)航信號(hào)直接序列擴(kuò)頻(DSSS)的低功率信號(hào)特性，在滿足一定通信信號(hào)誤碼率(BER)要求的前提下，將導(dǎo)航中心產(chǎn)生的功率受控弱衛(wèi)星導(dǎo)航增強(qiáng)信號(hào)在所選GEO衛(wèi)星通信頻段上進(jìn)行載波調(diào)制與轉(zhuǎn)發(fā)。而在接收端，利用頻移(FRESH)濾波器以及一定的自適應(yīng)信號(hào)抵消算法，可有效去除強(qiáng)通信信號(hào)的干擾并分離出弱衛(wèi)星導(dǎo)航增強(qiáng)信號(hào)。仿真結(jié)果表明，對(duì)于分離出的弱衛(wèi)星導(dǎo)航增強(qiáng)信號(hào)，在其對(duì)應(yīng)的功率控制范圍內(nèi)可具有較好的跟蹤與捕獲性能，由此也驗(yàn)證了所提方法的有效性。
-
關(guān)鍵詞:
- 全球衛(wèi)星導(dǎo)航系統(tǒng) /
- 信號(hào)轉(zhuǎn)發(fā) /
- 地球同步軌道通信衛(wèi)星 /
- 導(dǎo)航信號(hào)增強(qiáng) /
- 頻移濾波器
Abstract: A method based on the signal retransmission by the Geostationary Earth Orbit (GEO) comsat for the navigation satellite signal enhancement is proposed. At the signal transmitting side, utilizing the property of low power density of the Direct Sequence Spread Spectrum (DSSS), the power-controlled weak DSSS navigation signal, which is generated at the navigation center, can be modulated and retransmitted on the frequency band of the GEO comsat under the proper Bit Error Rate (BER) requirement of the communication signal. While at the receiving side, with the FREquency-SHift (FRESH) filter and a given adaptive signal cancellation algorithm, the strong communication signal can be well cancelled and thus the weak navigation enhanced signal is separated. The simulation results show that for the separated navigation enhanced signal, a relatively good acquisition and tracking performance can be got in its controlled power range, and this also verifies the effectiveness of the proposed method. -
計(jì)量
- 文章訪問數(shù): 1889
- HTML全文瀏覽量: 139
- PDF下載量: 606
- 被引次數(shù): 0
下載:
