Estimation of inter-frequency bias for ambiguity resolution in global navigation satellite system receivers
First Claim
1. A method for position estimation comprising:
- accessing, by executing an instruction with a processor, carrier phase measurements and code measurements obtained for a plurality of satellite signals received by a mobile receiver from a plurality of satellites of a global navigation satellite system;
determining, by executing an instruction with the processor, an initial set of floating-point ambiguities based on the carrier phase measurements and the code measurements, the initial set of floating-point ambiguities including an inter-frequency bias;
performing, by executing an instruction with the processor, a least squares search process based on the initial set of floating-point ambiguities to determine a selected set of integer ambiguities and a corresponding estimate of the inter-frequency bias; and
estimating, by executing an instruction with the processor, a position of the mobile receiver based on the selected set of integer ambiguities and the corresponding estimate of the inter-frequency bias.
1 Assignment
0 Petitions
Accused Products
Abstract
Example methods disclosed herein include accessing carrier phase measurements and code measurements obtained for a plurality of satellite signals of a global navigation satellite system. Disclosed example methods also include determining an initial set of floating-point ambiguities based on the measurements, the initial set of floating-point ambiguities including inter-frequency bias (IFB). Disclosed example methods further include performing a least squares search process based on the initial set of floating-point ambiguities to determine a set of integer ambiguities and an estimate of the IFB. In some examples, an additional (e.g., wide-lane) filter is used to realize a combination of carrier phase and code IFB. In some examples, IFB estimation is further realized by determining a median of IFB estimates over a window time. In some examples, the resulting IFB estimate and the set of integer ambiguities are used to estimate a position of a receiver, determine a satellite correction signal, etc.
32 Citations
20 Claims
-
1. A method for position estimation comprising:
-
accessing, by executing an instruction with a processor, carrier phase measurements and code measurements obtained for a plurality of satellite signals received by a mobile receiver from a plurality of satellites of a global navigation satellite system; determining, by executing an instruction with the processor, an initial set of floating-point ambiguities based on the carrier phase measurements and the code measurements, the initial set of floating-point ambiguities including an inter-frequency bias; performing, by executing an instruction with the processor, a least squares search process based on the initial set of floating-point ambiguities to determine a selected set of integer ambiguities and a corresponding estimate of the inter-frequency bias; and estimating, by executing an instruction with the processor, a position of the mobile receiver based on the selected set of integer ambiguities and the corresponding estimate of the inter-frequency bias. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A non-transitory computer readable medium comprising computer readable instructions which, when executed, cause a processor to at least:
-
access carrier phase measurements and code measurements obtained for a plurality of satellite signals received by a mobile receiver from a plurality of satellites of a global navigation satellite system; determine an initial set of floating-point ambiguities based on the carrier phase measurements and the code measurements, the initial set of floating-point ambiguities including an inter-frequency bias; perform a least squares search process based on the initial set of floating-point ambiguities to determine a selected set of integer ambiguities and a corresponding estimate of the inter-frequency bias; and estimate a position of the mobile receiver based on the selected set of integer ambiguities and the corresponding estimate of the inter-frequency bias. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. An apparatus comprising:
-
an ambiguity resolution engine implemented at least one of on at least one processor or by hardware, the ambiguity resolution engine to; determine an initial set of floating-point ambiguities based on carrier phase measurements and code measurements obtained for a plurality of satellite signals received by a mobile receiver from a plurality of satellites of a global navigation satellite system, the initial set of floating-point ambiguities including an inter-frequency bias; and perform a least squares search process based on the initial set of floating-point ambiguities to determine a selected set of integer ambiguities and a corresponding estimate of the inter-frequency bias; and a position determiner implemented at least one of on at least one processor or by hardware, the position determiner to estimate a position of the mobile receiver based on the selected set of integer ambiguities and the corresponding estimate of the inter-frequency bias. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification