基于I/Q支路相干積分觀測濾波的GPS接收機信號跟蹤方法
doi: 10.11999/JEIT140314
基金項目:
國家自然科學(xué)基金(61102107, 61374208)和中央高?；究蒲袠I(yè)務(wù)費專項基金(HEUCFX41310)資助課題
GPS Receiver Signal Tracking Method Based on I/Q Branch Coherent Integration Measurements Filter
-
摘要: 針對傳統(tǒng)GPS接收機在弱信號環(huán)境下跟蹤誤差大，收斂速度慢的缺點，該文提出一種基于I/Q支路相干積分觀測濾波的GPS信號跟蹤方法。將接收機I/Q支路相干積分輸出為觀測量，應(yīng)用無跡卡爾曼濾波(Unscented Kalman Filter, UKF)算法構(gòu)建卡爾曼濾波器，得到基帶數(shù)字信號處理濾波模型，閉合接收機跟蹤環(huán)路。該方法能夠有效減小傳統(tǒng)GPS跟蹤環(huán)路中信號參數(shù)的估計誤差，提高接收機抗干擾能力和弱信號環(huán)境下環(huán)路跟蹤性能。仿真對比結(jié)果表明，不同載噪比環(huán)境下相比傳統(tǒng)GPS信號跟蹤的方法，基于I/Q支路相干積分觀測的信號跟蹤算法能夠提高跟蹤精度，加快跟蹤收斂速度。
-
關(guān)鍵詞:
- 全球定位系統(tǒng) /
- 弱信號 /
- 跟蹤環(huán)路 /
- 相干積分
Abstract: Due to the disadvantages of a traditional GPS receiver in the environment of weak signal are that slow convergence rate and serious tracking error, a GPS signal tracking algorithm is proposed, in which the coherent integration of I/Q branch is considered as measurement of Unscented Kalman Filter (UKF). The filter model of the baseband signal processing is constructed and tracking loop is closed by UKF. Then the signal parameters of GPS tracking loop can be accurately estimated. Moreover, the anti-jamming capability and tracking ability of receiver are improved in the presence of weak signals. Simulation results demonstrate that the tracking ability and convergence rate of proposed algorithm outperform traditional method in the case of different Carrier to Noise ratio (C/N).-
Key words:
- GPS /
- Weak signal /
- Tracking loop /
- Coherent integration
-
計量
- 文章訪問數(shù): 2841
- HTML全文瀏覽量: 239
- PDF下載量: 697
- 被引次數(shù): 0
下載:
