Navigation receiver with coupled signal-tracking channels

Details Navigation receiver with coupled signal-tracking channels Navigation receiver with coupled signal-tracking channels

G - Physics

01

S

G01S 5/14 (2006.01) G01S 5/02 (2006.01)

Patent

CA 2118013

The navigation receiver with coupled-tracking channels is intended for use in radio navigation systems based on trilatera- tion wherein the times of arrival of radio signals transmitted by a plurality of ground- or space-based terminals are measured by a user terminal and utilized by the user terminal in calculating its position and orientation. The coupled-tracking navigation re- ceiver periodically measures carrier phase, carrier frequency, modulation phase, and carrier amplitude for all of the signals arriving at the receiving ports of the receiver and periodically es- timates the present values of carrier phase, carrier frequency, and modulation phase for all of the received signals, the estimat- ing process utilizing for each parameter estimate the parameter measurements for a plurality of the received signals properly combined in a statistically appropriate manner by taking into ac- count the relative geometry of the line-of-sight paths, receiver clock time dynamics, and dynamics and motion constraints of the receiver platform, thereby obtaining better performance un- der poor signal reception conditions and more accurate esti- mates of carrier phase, carrier frequency, and modulation phase for each of the received signals than independent measurements alone could provide. It follows that these more accurate esti- mates of the basic signal parameters lead to more accurate esti- mates of platform position and attitude and the rates of change of these quantities.

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