›› 2016, Vol. 36 ›› Issue (5): 57-.doi: 10.16708/j.cnki.1000-758X.2016.0058

• 技术交流 • 上一篇    下一篇

星载接收机通道时延实时校准方法

于雪晖, 李集林, 王盾, 吴佳鹏   

  1. 北京卫星信息工程研究所,北京100086
  • 收稿日期:2016-01-18 修回日期:2016-05-18 出版日期:2016-10-25 发布日期:2016-06-30

Realtimecalibrationmethodforsatellitereceiverchanneldelay

YU  Xue-Hui, LI  Ji-Lin, WANG  Dun, WU  Jia-Peng   

  1. BeijingInstituteofSatelliteInformationEngineering,Beijing100086,China
  • Received:2016-01-18 Revised:2016-05-18 Online:2016-10-25 Published:2016-06-30

摘要: 针对星间钟差测量及时间频率的精确传递的需求,通常情况都会在地面对卫星的收发通道时延进行准确标定,但在空间环境下设备老化和环境温度变化会导致收发通道时延逐渐偏离标定值。利用伪码相关测距的原理,结合时分早迟伪码相位交替调制技术和包络检波技术,提出了一种在轨通道时延自校准方法。通过3条闭合测量环路的建立,在不影响接收机正常收发通信的情况下,实时校准其收发通道时延。结果表明,该方法时延测量精度达到亚纳秒量级。

关键词: 通道时延, 在轨测量, 实时校准, 伪码测距, 包络检波

Abstract: Inordertoaccomplishaccuratemeasurementofintersatelliteclockerrorandtransferoftimeandfrequency,theequipmentdelayonthegroundareusuallyrequiredtobecalibrated.Withtheagingofequipmentandthechangeofenvironmenttemperature,thedelayofsendreceivesignalwilldeviatethestandardization.Byusingpseudorandomcodecorrelationmeasurement,combiningwiththetimedivisionearlydelaypseudorandomcodephasealternationmodulationtechnologyandenvelopetechnology,aninorbitchanneldelayselfcalibrationmethodwasproposed.Bydesigningaproperclosedloop,thesendreceivechanneldelaycanbecalibratedinrealtimewithoutinfluencingthenormalcommunication.Theresultsindicatethatthedelaymeasurementprecisionofthismethodreachessubnanosecondlevel.

Key words: channeldelay, inorbitmeasurement, realtimecalibration, pseudorandomcodemeasurement, envelopedemodulation