基于I/Q支路相干積分觀測(cè)濾波的GPS接收機(jī)信號(hào)跟蹤方法
doi: 10.11999/JEIT140314 cstr: 32379.14.JEIT140314
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61102107, 61374208)和中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)基金(HEUCFX41310)資助課題
GPS Receiver Signal Tracking Method Based on I/Q Branch Coherent Integration Measurements Filter
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摘要: 針對(duì)傳統(tǒng)GPS接收機(jī)在弱信號(hào)環(huán)境下跟蹤誤差大，收斂速度慢的缺點(diǎn)，該文提出一種基于I/Q支路相干積分觀測(cè)濾波的GPS信號(hào)跟蹤方法。將接收機(jī)I/Q支路相干積分輸出為觀測(cè)量，應(yīng)用無(wú)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(hào)處理濾波模型，閉合接收機(jī)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(hào)參數(shù)的估計(jì)誤差，提高接收機(jī)抗干擾能力和弱信號(hào)環(huán)境下環(huán)路跟蹤性能。仿真對(duì)比結(jié)果表明，不同載噪比環(huán)境下相比傳統(tǒng)GPS信號(hào)跟蹤的方法，基于I/Q支路相干積分觀測(cè)的信號(hào)跟蹤算法能夠提高跟蹤精度，加快跟蹤收斂速度。
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關(guān)鍵詞:
- 全球定位系統(tǒng) /
- 弱信號(hào) /
- 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
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