发明名称 |
GNSS SIGNAL PROCESSING METHODS AND APPARATUS WITH AMBIGUITY CONVERGENCE INDICATION |
摘要 |
Methods and apparatus are provided for estimating parameters, i.e. ambiguities, derived from GNSS signals. Observations of a GNSS signal from each of a plurality of GNSS satellites are obtained (2120). The observations are fed to a filter having a state vector comprising a float ambiguity for each received frequency of the GNSS signals (2140). The filter estimates a float value for each float ambiguity of the state vector and covariance values associated with the state vector. Integer values are assigned to at least a subgroup of the estimated float values to define a plurality of integer ambiguity candidate sets (2160). A weighted average of the candidate sets is formed (2200). A formal precision value based on covariance values of the filter is determined (2205), the formal precision value being a measure for an achievable precision. An achieved precision value of the weighted average is determined (2210). The achieved precision value is compared with the formal precision value to obtain a convergence value (2215). A convergence of the determination of the state vector is indicated (2218). Ambiguities of the weighted average can be used in subsequent operations to aid in determining a position of the receiver or can be used to prepare data, e.g., in a network processor that can be used to augment position information of a rover. |
申请公布号 |
WO2010021659(A2) |
申请公布日期 |
2010.02.25 |
申请号 |
WO2009US04474 |
申请日期 |
2009.08.05 |
申请人 |
TRIMBLE NAVIGATION LIMITED;TALBOT, NICHOLAS, CHARLES;VOLLATH, ULRICH |
发明人 |
TALBOT, NICHOLAS, CHARLES;VOLLATH, ULRICH |
分类号 |
G01S19/01;G01S19/20;G01S19/44 |
主分类号 |
G01S19/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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