JP2013057525A5 - Decryption method, decryption device, and electronic device - Google Patents

Decryption method, decryption device, and electronic device Download PDF

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JP2013057525A5
JP2013057525A5 JP2011194657A JP2011194657A JP2013057525A5 JP 2013057525 A5 JP2013057525 A5 JP 2013057525A5 JP 2011194657 A JP2011194657 A JP 2011194657A JP 2011194657 A JP2011194657 A JP 2011194657A JP 2013057525 A5 JP2013057525 A5 JP 2013057525A5
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data
decoding
parity check
matching
data portion
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JP2013057525A (en
JP5849547B2 (en
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Claims (9)

航法メッセージを搬送する衛星信号を受信することと、
前記受信した信号を復号することと、
前記航法メッセージの搬送データ単位で、前記復号したデータをパリティチェック処理することと、
前記データのうち、衛星固有情報が繰り返し搬送されるデータ部分に関する前記パリティチェック処理の結果を、前記繰り返し搬送されるデータ部分同士で照合することと、
前記照合の結果に基づいて、前記復号の正否を判定することと、
を含む復号方法。 Receiving a satellite signal carrying a navigation message;
Decoding the received signal;
Parity check processing the decoded data in units of transport data of the navigation message;
Among the data, and that the result of the parity check process on the data portion of the satellite-specific information is repeatedly conveyed, to match in the data portion with each other is the repeated transport,
Determining whether the decoding is correct or not based on the result of the matching;
Decryption method including: 前記データのうち、前記パリティチェック処理で誤りが検出されなかったデータ部分について、妥当性を判定する所定の妥当性判定処理を行うことを更に含み、
前記照合することは、前記衛星固有情報が繰り返し搬送されるデータ部分であり、且つ、前記妥当性判定処理で妥当性がないと判定されたデータ部分同士を照合することを含む、
請求項１に記載の復号方法。 The method further includes performing a predetermined validity determination process for determining validity of a portion of the data for which an error is not detected in the parity check process,
The matching includes matching the data portions in which the satellite specific information is repeatedly transported and which are determined to be invalid in the validity determination process.
The decoding method according to claim 1. 前記照合することは、前記衛星固有情報が繰り返し搬送されるデータ部分について、前記パリティチェック処理で誤りが検出されたデータ部分と前記妥当性判定処理で妥当性がないと判定されたデータ部分とを照合することを含む、
請求項２に記載の復号方法。 The checking is performed on the data portion in which the satellite specific information is repeatedly transported, the data portion in which an error is detected in the parity check process, and the data portion in which the validity determination process is determined to be invalid. Including matching,
The decoding method according to claim 2. 前記妥当性判定処理は、前記パリティチェック処理で誤りが検出されなかったデータ部分に隣り合う前記搬送データ単位のデータ部分に係る前記パリティチェック処理の結果に基づいて、前記妥当性を判定する処理である、
請求項２又は３に記載の復号方法。 The appropriateness determination processing, the parity check process based on the results of the parity check process according to the data portion of the transport data units adjacent to the data portion for which no error was detected, at process of determining the validity is there,
A decoding method according to claim 2 or 3. 前記搬送データ単位には、誤り検出符号が含まれており、
前記照合することは、前記誤り検出符号を除外したデータ部分同士を照合することを含む、
請求項１〜４の何れか一項に記載の復号方法。 The transport data unit includes an error detection code,
The matching includes matching data portions excluding the error detection code.
The decoding method as described in any one of Claims 1-4. 前記照合することは、前記衛星固有情報が繰り返し搬送されるデータ部分のうち一方のビット列を反転して照合することを含む、
請求項１〜５の何れか一項に記載の復号方法。 The matching includes inverting and matching one bit string of the data portion to which the satellite specific information is repeatedly conveyed.
The decoding method as described in any one of Claims 1-5. 前記パリティチェック処理は、誤りを検出したビットについて誤りを訂正することを含む、
請求項１〜６の何れか一項に記載の復号方法。 The parity check process includes correcting errors for bits that have detected errors.
The decoding method as described in any one of Claims 1-6. 航法メッセージを搬送する衛星信号を受信した信号を復号する復号部と、
前記航法メッセージの搬送データ単位で、前記復号したデータをパリティチェック処理するパリティチェック処理部と、
前記データのうち、衛星固有情報が繰り返し搬送されるデータ部分に関する前記パリティチェック処理の結果を、当該繰り返し搬送されるデータ部分同士で照合する照合部と、
前記照合の結果に基づいて、前記復号の正否を判定する復号正否判定部と、
を備えた復号装置。 A decoding unit for decoding a signal received from a satellite signal carrying a navigation message;
In the transport data units of the navigation message, and the parity check processing unit for parity check processing the decoded data,
Among the data, the matching part a result of the parity check process on the data portion of the satellite-specific information is repeatedly conveyed, to match in the data portion with each other is the repeated transport,
A decoding correctness determination unit that determines whether the decoding is correct or not based on a result of the matching;
Decoding device provided with 請求項８に記載の復号装置を含む、電子機器。 An electronic device comprising the decoding device according to claim 8 .
JP2011194657A 2011-09-07 2011-09-07 Decoding method, decoding device, and electronic device Expired - Fee Related JP5849547B2 (en)

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JP2013057525A5 true JP2013057525A5 (en) 2014-09-18
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JP6206478B2 (en) * 2015-12-24 2017-10-04 カシオ計算機株式会社 Satellite radio wave receiver, radio wave clock, code signal acquisition method and program
JP6206479B2 (en) * 2015-12-24 2017-10-04 カシオ計算機株式会社 Satellite radio wave receiver, radio clock, information acquisition method and program
JP6686992B2 (en) * 2017-09-05 2020-04-22 カシオ計算機株式会社 Satellite radio receiver, radio clock, code signal acquisition method and program

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JPS5833339A (en) * 1981-08-21 1983-02-26 Nippon Signal Co Ltd:The Transmitter and receiver of series code
JPS62241447A (en) * 1986-04-14 1987-10-22 Alps Electric Co Ltd Triple error control system
JPH0614012A (en) * 1992-06-25 1994-01-21 Matsushita Electric Works Ltd Data transmission system
JP2003194910A (en) * 2001-12-26 2003-07-09 Matsushita Electric Ind Co Ltd Location detecting apparatus
US7545317B2 (en) * 2006-11-10 2009-06-09 Sirf Technology, Inc. Method and apparatus for navigation data downloads from weak signals
US7636060B2 (en) * 2007-01-05 2009-12-22 Mediatek Inc. Method and apparatus for collecting subframes of satellite navigation data
JP2010197189A (en) * 2009-02-25 2010-09-09 Seiko Epson Corp Time determination method and time determination device
JP2011052987A (en) * 2009-08-31 2011-03-17 Casio Computer Co Ltd Positioning data receiver, error correction device, and program

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