Information processing device

Patent metadata

Field	Value
Publication number	US-10816669-B2
Application number	US-201715610249-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Oct 30, 2014
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A reinforcement information adjustment unit reduces an amount of information in reinforcement information by combining: update cycle adjustment processing to set an update cycle of the reinforcement information to be an integer multiple of a predetermined update cycle; geographic interval error value adjustment processing to reduce the number of geographic interval error values by selecting from among a plurality of the geographic interval error values each of which is an error at every predetermined geographic interval out of a plurality of error values, a geographic interval error value at every geographic interval that is an integer multiple of the predetermined geographic interval; and bit count adjustment processing to reduce a bit count of the error value for each error value. A reinforcement information output unit outputs, to an output destination, reinforcement information after being reduced in the amount of information by the reinforcement information adjustment unit.

First claim

The invention claimed is:

1. An information processing device used to correct a satellite positioning error, comprising:
circuitry including a processor coupled to memory and configured to:
generate reinforcement information that is updated in a predetermined cycle, includes a plurality of error values, and is used to correct the satellite positioning error;
reduce an amount of information in the reinforcement information by degrading the reinforcement information on an order of centimeters to reinforcement information on an order of decimeters; and
output, to a wireless network, the reinforcement information after being reduced in the amount of information, wherein
the circuitry reduces the amount of information in the reinforcement information by combining:
update cycle adjustment processing to set an update cycle of the reinforcement information to be an integer multiple being twice or more of the predetermined update cycle;
geographic interval error value adjustment processing to reduce the number of geographic interval error values by selecting from among a plurality of the geographic interval error values each of which is an error at every predetermined geographic interval in a plurality of grid points, out of the plurality of error values, a geographic interval error value at every geographic interval that is an integer multiple being twice or more of the predetermined geographic interval in each of a latitude direction and a longitude direction; and
bit count adjustment processing to reduce a bit count of the error value, for each error value relevant to a carrier wave, starting from a least significant bit, such that a bit count after reduction is smaller than a bit count before the reduction.

2. The information processing device according to claim 1 , wherein the circuitry is further configured to:
process, as the update cycle adjustment processing, to set the update cycle of the reinforcement information to be twice the predetermined update cycle;
process, as the geographic interval error value adjustment processing, to reduce the number of the geographic interval error values by selecting the geographic interval error value at every geographic interval that is triple the predetermined geographic interval in each of the latitude direction and the longitude direction from among the plurality of the geographic interval error values; and
process, as the bit count adjustment processing, to reduce the bit count, for each error value relevant to the carrier wave, starting from the least significant bit, such that the bit count after the reduction is equal to any bit count between 60% and 80% of the bit count before the reduction.

3. The information processing device according to claim 1 , wherein the circuitry to perform the geographic interval error value adjustment processing, is configured to:
process to reduce the number of ionospheric delay error values by selecting an ionospheric delay error value at every geographic interval that is triple the predetermined geographic interval in each of the latitude direction and the longitude direction from among a plurality of the ionospheric delay error values; and
process to reduce the number of tropospheric delay error values by selecting a tropospheric delay error value at every geographic interval that is triple the predetermined geographic interval in each of the latitude direction and the longitude direction from among a plurality of tropospheric delay error values.

4. An information processing device used to correct a satellite positioning error, comprising:
circuitry including a processor coupled to a memory and configured to:
generate reinforcement information that is updated in a predetermined cycle, includes a plurality of error values, and is used to correct the satellite positioning error;
reduce an amount of information in the reinforcement information by degrading the reinforcement information on an order of centimeters to reinforcement information on an order of decimeters; and
output, to a wireless network, the reinforcement information after being reduced in the amount of information, wherein
the circuitry reduces the amount of information in the reinforcement information by combining:
update cycle adjustment processing to set an update cycle of the reinforcement information to be an integer multiple being twice or more of the predetermined update cycle;
geographic interval error value adjustment processing to analyze a plurality of the geographic interval error values each of which is an error at every predetermined geographic interval in a plurality of grid points, out of the plurality of error values, calculate, for each geographic interval, a coefficient value of a coefficient included in an approximate expression used to calculate an approximate value of the geographic interval error value, and include the coefficient value for each geographic interval in the reinforcement information in place of the plurality of the geographic interval error values; and
bit count adjustment processing to reduce a bit count of the error value, for each error value relevant to a carrier wave, starting from a least significant bit, such that a bit count after reduction is smaller than a bit count before the reduction.

5. The information processing device according to claim 4 , wherein the circuitry is further configured to:
process, as the update cycle adjustment processing, to set the update cycle of the reinforcement information to be twice the predetermined update cycle; and
process, as the bit count adjustment processing, to reduce the bit count, for each error value relevant to the carrier wave, starting from the least significant bit such that the bit count after the reduction is equal to any bit count between 60% and 80% of the bit count before the reduction.

6. The information processing device according to claim 4 , wherein the circuitry to perform the geographic interval error value adjustment processing is configured to:
process to analyze a plurality of ionospheric delay error values, calculate, for each geographic interval, a coefficient value of a coefficient included in an approximate expression used to calculate an approximate value of the ionospheric delay error value, and include the coefficient value for each geographic interval in the reinforcement information in place of the plurality of the ionospheric delay error values; and
process to analyze a plurality of tropospheric delay error values, calculate, for each geographic interval, a coefficient value of a coefficient included in an approximate expression used to calculate an approximate value of the tropospheric delay error value, and include the coefficient value for each geographic interval in the reinforcement information in place of the plurality of the tropospheric delay error values.

7. The information processing device according to claim 1 , wherein
the circuitry generates integrity information notifying of a decrease in reliability of positioning accuracy caused by the geographic interval error value adjustment processing and the bit count adjustment processing, and includes the generated integrity information into reinforcement information after being reduced in the amount of information, and
the circuitry outputs, to the wireless network, the reinforcement information after being reduced in the amount of information which includes the integrity information.

8. The information processing device according to claim 4 , wherein
the circuitry generates integrity information notifying of a decrease in reliability of positioning accuracy caused by the geographic interval error value adjustment processing and the bit count adjustment processing, and includes the generated integrity information into rei

Assignees

• Mitsubishi Electric Corp

Inventors

• Saito Masayuki
• Miya Masakazu
• Shima Yoshihiro
• Sone Hisao
• Terao Kazuhiro
• Fujita Seigo

Classifications

• G01S19/072

  Ionosphere corrections · CPC title

• G01S19/42 Primary

  Determining position · CPC title

• G01S19/074 Primary

  providing integrity data, e.g. WAAS · CPC title

• G01S19/08

  providing integrity information, e.g. health of satellites or quality of ephemeris data · CPC title

• G01S19/426

  by combining or switching between position solutions or signals derived from different modes of operation in a single system · CPC title