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    • 3. 发明授权
    • Multi-level/multi-threshold/multi-persistency GPS/GNSS atomic clock monitoring
    • 多级/多阈值/多持续性GPS / GNSS原子钟监测
    • EP2897001B1
    • 2017-09-06
    • EP14198176.1
    • 2014-12-16
    • The Boeing Company
    • Li, RongshengGhassemi, Kamran
    • G04F5/14G01R23/00G01S19/37G04G7/00G01S19/02G01S19/20
    • G01S19/20G01S19/02G01S19/235G01S19/40G01S19/42G04F5/14H03L7/087H03L7/0991H04L27/00
    • Methods and apparatus to monitor GPS/GNSS atomic clocks are disclosed. An example method includes establishing a measured difference between an atomic frequency standard (AFS) and a monitoring device. The method also includes modeling an estimated difference model between the AFS and the monitoring device, and computing a residual signal based on the measured difference and the estimated difference model. In addition, the method includes analyzing, by a first detector, the residual signal at multiple thresholds, each of the thresholds having a corresponding persistency defining the number of times a threshold is exceeded before one or more of a phase jump, a rate jump, or an acceleration error is indicated. Furthermore, the method includes analyzing, by a second detector, a parameter of the estimated difference model at multiple thresholds, each of the thresholds having a corresponding persistency defining the number of times a drift threshold is exceeded before a drift is indicated.
    • 公开了监测GPS / GNSS原子钟的方法和设备。 一种示例方法包括建立原子频率标准(AFS)与监测设备之间的测量差异。 该方法还包括对AFS和监测装置之间的估计的差异模型建模,并且基于测量的差异和估计的差异模型来计算残差信号。 此外,该方法包括通过第一检测器在多个阈值处分析残差信号,每个阈值具有相应的持久性,该相应的持续性定义了在相位跳跃,速率跳跃等中的一个或多个之前超过阈值的次数。 或指示加速度错误。 此外,该方法包括通过第二检测器在多个阈值处分析估计的差异模型的参数,每个阈值具有对应的持续性,所述对应的持续性定义了在指示漂移之前超过漂移阈值的次数。
    • 9. 发明公开
    • LOCATION METHOD, LOCATION PROGRAM, GNSS RECEIVER APPARATUS, AND MOBILE TERMINAL
    • 爱国者联合会,爱国者联合会,全球导航卫星系统
    • EP2541278A1
    • 2013-01-02
    • EP11747406.4
    • 2011-02-23
    • Furuno Electric Co., Ltd.
    • TOMINAGA, Takaki
    • G01S19/22G01S19/37G01S19/40
    • G01S19/22G01S19/37G01S19/40G01S19/42G01S19/428
    • A highly accurate positioning operation is achieved regardless of an existence of multipath. An observed pseudorange ρ m (k) is acquired based on reception signals of positional signals (S101). A current determination estimated pseudorange ρ mp (k) is calculated based on a previous estimation result (S102). A determination difference value Delta ρm (k) is calculated based on the observed pseudorange ρ m (k) and the estimated pseudorange ρ m p(k) (S103). A determination threshold σ Deltaρ is calculated based on a C/No of the reception signal and PDOP (S104). If the determination difference value Delta ρm (k) is below the threshold σ Deltaρ , an error variance σ m (k) is calculated using an approximate equation of the C/No (S105(NO) → S106), and if the determination difference value Delta ρm (k) is above the threshold σ Deltaρ , the error variance σ ρm (k) is calculated based on the threshold σ Deltaρ (S105(YES) → S107).
    • 无论多路径是否存在,都能实现高精度的定位操作。 基于位置信号的接收信号来获取观测到的伪距Ám(k)(S101)。 基于先前的估计结果来计算当前确定估计伪距(mp)(k)(S102)。 基于观察到的伪距Ám(k)和估计的伪距Λm p(k)(S103)来计算确定差值Δa(k)。 基于接收信号和PDOP的C / No计算确定阈值ΔΔΔ(S104)。 如果确定差值Δa(k)低于阈值ΔΔΔ,则使用C / No(S105(NO)†'S106)的近似等式来计算误差方差Ã(k),并且如果确定差值 差值Δa(k)高于阈值ΔΔΔ,基于阈值ΔΔ(S105(是)†'S107)计算误差方差Ám(k)。