公开(公告)号：US5311194A

公开(公告)日：1994-05-10

申请号：US945300

申请日：1992-09-15

申请人： Alison K. Brown

发明人： Alison K. Brown

IPC分类号： B64D45/04 ,  G01C21/00 ,  G01S19/07 ,  G01S19/11 ,  G01S19/44 ,  G01S19/46 ,  H04B7/185 ,  G01S5/02

CPC分类号： G01S19/11 ,  G01S19/07

摘要： A GPS precision approach and landing system for aircraft employs a fixed ground facility and a single satellite navigation receiver on board the aircraft. The fixed ground facility includes a reference receiver that measures differential corrections to the satellite code and carrier measurements and a pseudolite that is employed to transmit these corrections to a broadband GPS receiver on board the aircraft and to provide an additional code and carrier measurement to assist in the navigation solution. The pseudolite signal is broadcast at a frequency offset from the L1 GPS frequency in order to prevent interference with the satellite navigation system. The broadband GPS receiver on board the aircraft is capable of making phase coherent measurements from the GPS satellites, the pseudolite signal, and the GLONASS satellites. These phase coherent measurements are combined to form a precise differential carrier ranging (DCR) solution that is used to provide three-dimensional position guidance of the aircraft throughout a precision approach and landing procedure.

摘要翻译： 用于飞机的GPS精密接近和着陆系统在飞机上使用固定地面设施和单个卫星导航接收机。 固定的地面设施包括一个参考接收机，用于测量对卫星编码和载波测量的差分校正，以及用于将这些校正传输到飞机上的宽带GPS接收机的伪卫星，并提供附加的码和载波测量来协助 导航解决方案。 为了防止与卫星导航系统的干扰，伪卫星信号以与L1 GPS频率偏移的频率广播。 飞机上的宽带GPS接收机能够从GPS卫星，伪卫星信号和GLONASS卫星进行相位相干测量。 这些相位相干测量被组合以形成精确的差分载波范围（DCR）解决方案，其用于在精确进近和着陆过程中提供飞行器的三维位置引导。

公开(公告)号：US5379224A

公开(公告)日：1995-01-03

申请号：US800850

申请日：1991-11-29

申请人： Alison K. Brown ,  Mark A. Sturza

发明人： Alison K. Brown ,  Mark A. Sturza

IPC分类号： G01S5/00 ,  G01S5/14 ,  G01S19/02 ,  G01S19/11 ,  H04B7/15 ,  G01S5/02

CPC分类号： G01S19/09 ,  G01S19/37 ,  G01S5/0009 ,  G01S19/35

摘要： A low cost tracking system employing satellites of the global positioning system (GPS) is suitable for applications involving radiosondes, sonobuoys, and other objects. The tracking system includes a sensor mounted on each object which digitally samples the GPS satellite signals and records them in a data buffer. The digital samples are then transmitted, at a rate lower than that at which the GPS satellite signals were sampled, over a data telemetry link, interleaved with other telemetry data from the object. The GPS data is processed in a data processing workstation where the position and velocity of the sensor, at the time the data was sampled, is computed. The data buffer in the sensor is periodically refreshed, and the workstation periodically computes the new position and velocity of the sensor. Differential corrections are also provided at the workstation to aid in signal acquisition and to increase the precision of the position fix.

摘要翻译： 采用全球定位系统（GPS）卫星的低成本跟踪系统适用于涉及无线电探空仪，声波和其他物体的应用。 跟踪系统包括安装在每个物体上的传感器，对GPS卫星信号进行数字采样并将其记录在数据缓冲器中。 然后，数字样本以比GPS卫星信号被采样的速率低的速率通过数据遥测链路传输，与来自对象的其他遥测数据交错。 GPS数据在数据处理工作站中进行处理，其中计算出数据采集时传感器的位置和速度。 定期刷新传感器中的数据缓冲区，工作站周期性地计算传感器的新位置和速度。 工作站还提供差分校正，以帮助信号采集并提高定位精度。

公开(公告)号：US5225842A

公开(公告)日：1993-07-06

申请号：US697754

申请日：1991-05-09

申请人： Alison K. Brown ,  Mark A. Sturza

发明人： Alison K. Brown ,  Mark A. Sturza

IPC分类号： G01C21/00 ,  G01S5/00 ,  G01S5/14 ,  G01S19/02 ,  H04Q7/34

CPC分类号： G01S19/51 ,  G01S5/0009

摘要： A tracking system employing global positioning system (GPS) satellites provides extremely accurate position, velocity, and time information for vehicles or any other animate or inanimate object within any mobile radio communication system or information system, including those operating in high rise urban areas. The tracking system includes a sensor mounted on each object, a communication link, a workstation, and a GPS reference receiver. The sensor operates autonomously following initialization by an external network management facility to sequence through the visible GPS satellites, making pseudo range and delta range or time difference and frequency difference measurements. No navigation functions are performed by the sensor, thereby permitting significant reductions in the cost thereof. The raw satellite measurements, with relevant timing and status information, are provided to the communication link to be relayed periodically back to the workstation. Differential corrections may also be provided at the workstation to increase the accuracy of the object location determination. In normal operation, three satellite measurements are required to compute the location of the object, but for a short time period a minimum of two satellite measurements are acceptable with time, altitude, and map aiding information being provided by the workstation.