全新衛(wèi)星雙向時間比對調(diào)制解調(diào)器設(shè)計
發(fā)布時間:2018-10-05 19:04
【摘要】:衛(wèi)星雙向時間頻率傳遞是目前被廣泛應(yīng)用的遠(yuǎn)距離高精度時間頻率量值傳遞方法,其核心組成設(shè)備是雙向時間比對調(diào)制解調(diào)器.文章介紹了由北京無線電計量測試研究所研制的衛(wèi)星雙向時間比對調(diào)制解調(diào)器,該設(shè)備采用直接序列擴(kuò)頻(DSSS)和二進(jìn)制相移鍵控(BPSK)方式完成時間信號的調(diào)制,采用快速傅里葉變換(FFT)算法實現(xiàn)對信號的快速搜索和捕獲;利用二階鎖頻輔助三階鎖相環(huán)路達(dá)到動態(tài)性能和跟蹤精度的平衡;采用二階延遲鎖定環(huán)(DLL)來實現(xiàn)對碼相位的精密跟蹤和測量.采用兩個1.2m口徑天線的雙向比對地球站進(jìn)行短基線衛(wèi)星雙向時間比對試驗,試驗結(jié)果表明當(dāng)系統(tǒng)工作在2.5MChip/s碼速率時,該調(diào)制解調(diào)器的時間比對精度(標(biāo)準(zhǔn)偏差(1σ))能夠達(dá)到0.13ns.
[Abstract]:The bidirectional time-frequency transfer of satellite is widely used at present, which is widely used in long-distance and high-precision time-frequency value transmission. The core of the method is the bidirectional time comparison modem. This paper introduces a satellite bidirectional time comparison modem developed by Beijing Radio Metrology and testing Institute. The device uses direct sequence spread spectrum (DSSS) and binary phase-shift keying (BPSK) to modulate the time signal. The fast Fourier transform (FFT) algorithm is used to search and capture the signal, and the second-order frequency-locked loop is used to assist the third-order phase-locked loop to achieve the balance of dynamic performance and tracking accuracy. The second order delay locking loop (DLL) is used to accurately track and measure the code phase. The short baseline satellite bidirectional time comparison test using two 1.2m aperture antennas shows that the time comparison accuracy (1 蟽) of the modem can reach 0.13 ns when the system is operating at 2.5MChip/s code rate.
【作者單位】: 北京無線電計量測試研究所;計量與校準(zhǔn)技術(shù)國家級重點實驗室;
【分類號】:TN915.05
本文編號:2254525
[Abstract]:The bidirectional time-frequency transfer of satellite is widely used at present, which is widely used in long-distance and high-precision time-frequency value transmission. The core of the method is the bidirectional time comparison modem. This paper introduces a satellite bidirectional time comparison modem developed by Beijing Radio Metrology and testing Institute. The device uses direct sequence spread spectrum (DSSS) and binary phase-shift keying (BPSK) to modulate the time signal. The fast Fourier transform (FFT) algorithm is used to search and capture the signal, and the second-order frequency-locked loop is used to assist the third-order phase-locked loop to achieve the balance of dynamic performance and tracking accuracy. The second order delay locking loop (DLL) is used to accurately track and measure the code phase. The short baseline satellite bidirectional time comparison test using two 1.2m aperture antennas shows that the time comparison accuracy (1 蟽) of the modem can reach 0.13 ns when the system is operating at 2.5MChip/s code rate.
【作者單位】: 北京無線電計量測試研究所;計量與校準(zhǔn)技術(shù)國家級重點實驗室;
【分類號】:TN915.05
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