SATELLITE NAVIGATION DEVICE

• US 20110205116A1
• Filed: 10/26/2009
• Published: 08/25/2011
• Est. Priority Date: 10/28/2008
• Status: Active Grant

• Current Assignee: Furuno Electric Co, Ltd
• Original Assignee: Furuno Electric Co, Ltd
• Inventors: Goto, Yoji, Yamada, Katsuo, Nakamura, Hiraku, Fujisawa, Naomi
• Granted Patent: US 8,922,429 B2
• Time in Patent Office: Days
• US Class Current: 342/357.77
• CPC Class Codes: G01S 19/32 Multimode operation in a single same satellite system, e.g. GPS L1/L2
• CPC Class Codes: G01S 19/43 using carrier phase measurements, e.g. kinematic positioning; using long or short baseline interferometry

Abstract

A pseudo range is corrected with high accuracy using a pseudo range correction method that incorporates carrier smoothing. A code pseudo range correction unit (19) performs carrier smoothing of an L1 code pseudo range (PR_L1(i)) by the temporal change (ΔADR_L1(i)) in an L1 carrier phase, and performs carrier correction of a code ionosphere delay (I_PRL1(i)) by the temporal change (ΔI_ADRL1(i)) in a carrier ionosphere delay. The code pseudo range correction unit (19) performs ionosphere delay correction by subtracting the corrected ionosphere delay (I′_L1sm(i)) from the L1 code pseudo range (PR_L1sm(i)) after smoothing processing. At this time, a direction of the delay in the temporal change (ΔI_ADRL1(i)) in the carrier ionosphere delay included in the temporal change (ΔADR_L1(i)) in the L1 carrier phase is matched with a direction of the delay in the temporal change (ΔI_ADRL1(i)) in the carrier ionosphere delay used to calculate the corrected ionosphere delay (I′_L1sm(i)).

Claims

1. A satellite navigation device for calculating a code pseudo range based on a navigation signal from a navigation satellite, comprising:

a pseudo range correction module for correcting the code pseudo range that is smoothened based on a carrier phase, by performing an ionosphere delay correction with a code ionosphere delay,

wherein the pseudo range correction module matches a direction of a carrier ionosphere delay contained in the carrier phase with a direction of the code ionosphere delay to correct the code pseudo range.

2. The satellite navigation device of claim 1,

wherein the pseudo range correction module matches the direction of the carrier ionosphere delay contained in the carrier phase with the direction of the code ionosphere delay by matching a shifting direction of the carrier phase due to a first carrier ionosphere delay contained in the carrier phase used in the smoothing of the code pseudo range with a correction direction of a second carrier ionosphere delay for a carrier correction of the code ionosphere delay used in the ionosphere delay.

3. The satellite navigation device of claim 1, further comprising a positioning operation module for performing a positioning operation by using the code pseudo range corrected by the pseudo range correction module.

4. The satellite navigation device of claim 3, further comprising a reference signal generation module for generating a reference clock signal by using a clock offset obtained by the positioning operation.