Based on the platform of mobile carrier satellite tracking has a wide range of applications. The paper adopts the advanced method of to step response identify, using the data obtained by the experiment model of high-s...Based on the platform of mobile carrier satellite tracking has a wide range of applications. The paper adopts the advanced method of to step response identify, using the data obtained by the experiment model of high-speed acquisition, using the method of the least squares, finally the antenna control system model function was identified. Make use of integral separation algorithm, simu- link simulation and experiment analysis to set the control parameters of it. Stimulate the signal antenna control system under inter- fering. The experiment of the simulation experiment showed that the antenna control system model is stable with little error.展开更多
In this paper, feedforward attitude control law for a Tracking and Data Relay Satellite （TDRS） with mobile antennas is proposed. To track or point the target spacecraft with median/law orbit, the large mobile antenn...In this paper, feedforward attitude control law for a Tracking and Data Relay Satellite （TDRS） with mobile antennas is proposed. To track or point the target spacecraft with median/law orbit, the large mobile antennas have to move in a wide range. The movement of such mobile antennas disturbs the satellite attitude conscquently. Conventionally, the main body of thc satellitc and the mobile antennas are controlled independently. The proposed controller first estimates the angular momentum which the mobile antennas will produce based on tiLe momentum conservation equation. Next, it computes the desired velocity of reaction wheels to compensate the disturbance due to the antenna motion. It then adds the errnr of the wheels＇ velocity between a desired one and a current value as a feedforward signal to the control system. The proposed controller is demonstrated using a mathematical simulation, of which these results coincide well with analytical results.展开更多
BeiDou-3 navigation satellite system was officially opened in 2020.While bringing high-performance services to people around the world,the navigation system requires well-designed BeiDou antennas.In this paper,we prop...BeiDou-3 navigation satellite system was officially opened in 2020.While bringing high-performance services to people around the world,the navigation system requires well-designed BeiDou antennas.In this paper,we propose a wideband circularly polarized high-performance BeiDou antenna.The antenna realizes wideband circularly polarized radiation through a four-port sequential feed network,and the phase imbalance of the feed network from 1.05 to 1.80 GHz is less than 7°.The manufactured antenna demonstrates a return loss of more than 13 dB and an axial ratio<3 dB over the entire global navigation satellite system(GNSS)frequency band.The right-handed circular polarization(RHCP)gain of the proposed antenna is greater than 4 dB in the GNSS low-frequency band and can reach more than 7.1 dB in the high-frequency band.Dimension of the proposed antenna is 120 mm×120 mm×20 mm,i.e.,0.54λo×0.54λo×0.09λo,whereλo is the wavelength of the center frequency.The proposed antenna connected to a GNSS receiver has tracked 12 BeiDou satellites with C/N0 ratios of GNSS signals greater than 30 dB.Such a high-performance antenna provides a basis for high-quality positioning services.展开更多
针对高码率低轨卫星测控的需求,给出了一种新型三轴12 m X/Ka频段天线的设计思路,通过优化反射面结构型式、材料选择、力学分析、减轻重量,提高天线反射体的精度;进行天线座架驱动链路设计和刚度设计,提高天线系统的谐振频率;通过优化...针对高码率低轨卫星测控的需求,给出了一种新型三轴12 m X/Ka频段天线的设计思路,通过优化反射面结构型式、材料选择、力学分析、减轻重量,提高天线反射体的精度;进行天线座架驱动链路设计和刚度设计,提高天线系统的谐振频率;通过优化伺服控制与伺服选型设计,提高伺服跟踪控制性能。基于Nastran/Patran有限元软件,对多种工况下的天线承载结构进行了刚度分析、强度分析、面型精度分析与结构固有频率等分析,结果表明典型仰角下的天线主面精度、承载能力及谐振频率均满足要求。依据有限元分析结果,采用高精度碳纤维天线反射体、高刚度A-E-T三轴天线座架、大动态伺服控制的设计方案,合理设计了12 m反射面天线的整体结构形式以及连接形式,并进行了天线实物的加工。所设计加工的12 m反射面天线满足高精度、高刚度、过顶跟踪的性能指标要求,对中大口径天线的设计具有一定的参考意义。展开更多
文摘Based on the platform of mobile carrier satellite tracking has a wide range of applications. The paper adopts the advanced method of to step response identify, using the data obtained by the experiment model of high-speed acquisition, using the method of the least squares, finally the antenna control system model function was identified. Make use of integral separation algorithm, simu- link simulation and experiment analysis to set the control parameters of it. Stimulate the signal antenna control system under inter- fering. The experiment of the simulation experiment showed that the antenna control system model is stable with little error.
文摘In this paper, feedforward attitude control law for a Tracking and Data Relay Satellite （TDRS） with mobile antennas is proposed. To track or point the target spacecraft with median/law orbit, the large mobile antennas have to move in a wide range. The movement of such mobile antennas disturbs the satellite attitude conscquently. Conventionally, the main body of thc satellitc and the mobile antennas are controlled independently. The proposed controller first estimates the angular momentum which the mobile antennas will produce based on tiLe momentum conservation equation. Next, it computes the desired velocity of reaction wheels to compensate the disturbance due to the antenna motion. It then adds the errnr of the wheels＇ velocity between a desired one and a current value as a feedforward signal to the control system. The proposed controller is demonstrated using a mathematical simulation, of which these results coincide well with analytical results.
文摘BeiDou-3 navigation satellite system was officially opened in 2020.While bringing high-performance services to people around the world,the navigation system requires well-designed BeiDou antennas.In this paper,we propose a wideband circularly polarized high-performance BeiDou antenna.The antenna realizes wideband circularly polarized radiation through a four-port sequential feed network,and the phase imbalance of the feed network from 1.05 to 1.80 GHz is less than 7°.The manufactured antenna demonstrates a return loss of more than 13 dB and an axial ratio<3 dB over the entire global navigation satellite system(GNSS)frequency band.The right-handed circular polarization(RHCP)gain of the proposed antenna is greater than 4 dB in the GNSS low-frequency band and can reach more than 7.1 dB in the high-frequency band.Dimension of the proposed antenna is 120 mm×120 mm×20 mm,i.e.,0.54λo×0.54λo×0.09λo,whereλo is the wavelength of the center frequency.The proposed antenna connected to a GNSS receiver has tracked 12 BeiDou satellites with C/N0 ratios of GNSS signals greater than 30 dB.Such a high-performance antenna provides a basis for high-quality positioning services.
文摘针对高码率低轨卫星测控的需求,给出了一种新型三轴12 m X/Ka频段天线的设计思路,通过优化反射面结构型式、材料选择、力学分析、减轻重量,提高天线反射体的精度;进行天线座架驱动链路设计和刚度设计,提高天线系统的谐振频率;通过优化伺服控制与伺服选型设计,提高伺服跟踪控制性能。基于Nastran/Patran有限元软件,对多种工况下的天线承载结构进行了刚度分析、强度分析、面型精度分析与结构固有频率等分析,结果表明典型仰角下的天线主面精度、承载能力及谐振频率均满足要求。依据有限元分析结果,采用高精度碳纤维天线反射体、高刚度A-E-T三轴天线座架、大动态伺服控制的设计方案,合理设计了12 m反射面天线的整体结构形式以及连接形式,并进行了天线实物的加工。所设计加工的12 m反射面天线满足高精度、高刚度、过顶跟踪的性能指标要求,对中大口径天线的设计具有一定的参考意义。
