JP2011114862A5 - Receiver - Google Patents

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JP2011114862A5
JP2011114862A5 JP2010216618A JP2010216618A JP2011114862A5 JP 2011114862 A5 JP2011114862 A5 JP 2011114862A5 JP 2010216618 A JP2010216618 A JP 2010216618A JP 2010216618 A JP2010216618 A JP 2010216618A JP 2011114862 A5 JP2011114862 A5 JP 2011114862A5
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frequency
search
side lobe
search process
correlation value
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JP2010216618A
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JP5494394B2 (en
JP2011114862A (en
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Claims (7)

ＣＤＭＡ信号を受信した受信信号に対する相関演算処理を周波数方向に行う周波数探索処理を実行して捕捉周波数を決定して前記ＣＤＭＡ信号を捕捉する受信装置であって、
第１次周波数探索処理を実行する第１次サーチ実行部と、
前記第１次周波数探索処理に用いた相関積算時間をもとにサイドローブチェック用周波数を設定する設定部と、
前記第１次周波数探索処理の結果をもとに、前記サイドローブチェック用周波数を含む複数のサーチ周波数を選択する第２次サーチ周波数選択部と、
前記複数のサーチ周波数それぞれにおいて前記相関演算処理を行う第２次周波数探索処理を実行する第２次周波数サーチ実行部と、
前記第２次周波数探索処理の結果を用いて第３次周波数探索処理を実行して捕捉周波数を決定する捕捉周波数決定部と、
を備えた受信装置。 A reception apparatus that executes frequency search processing that performs correlation calculation processing on a received signal that has received a CDMA signal in a frequency direction to determine a capture frequency and capture the CDMA signal,
A first search execution unit that executes a first frequency search process;
A setting unit configured to set a side lobe check frequency based on the correlation integration time used in the first frequency search process;
A second search frequency selection unit that selects a plurality of search frequencies including the side lobe check frequency based on the result of the first frequency search process;
A second frequency search execution unit that executes a second frequency search process that performs the correlation calculation process on each of the plurality of search frequencies;
A capture frequency determination unit that executes a third frequency search process using the result of the second frequency search process to determine a capture frequency;
Receiver with. 前記設定部は、前記相関演算処理を周波数を変化させて行った場合に前記相関積算時間に応じて定まるメインローブとサイドローブとの周波数の差分を用いて前記サイドローブチェック用周波数を設定し、  The setting unit sets the side lobe check frequency using the difference between the frequency of the main lobe and the side lobe determined according to the correlation integration time when the correlation calculation process is performed while changing the frequency,
前記捕捉周波数決定部は、前記第２次周波数探索処理により求まった相関値が最も大きいサーチ周波数に基づいて前記第３次周波数探索処理を実行する、  The capture frequency determination unit executes the third frequency search process based on a search frequency having the largest correlation value obtained by the second frequency search process.
請求項１に記載の受信装置。  The receiving device according to claim 1. 前記第２次周波数サーチ実行部は、前記第２次周波数探索処理により求まった最大の相関値の周波数が前記サイドローブチェック用周波数であった場合には、当該サイドローブチェック用周波数に基づいて新たなサイドローブチェック用周波数を含む新たなサーチ周波数を選択して、前記第２次周波数探索処理を再度実行する、  When the frequency of the maximum correlation value obtained by the second frequency search processing is the frequency for the side lobe check, the second frequency search execution unit newly generates a new frequency based on the frequency for the side lobe check. Select a new search frequency including a common side lobe check frequency, and execute the second frequency search process again.
請求項１又は２に記載の受信装置。  The receiving device according to claim 1. 前記第２次周波数サーチ実行部は、前記第２次周波数探索処理を再度実行する時に、既に実行した前記第２次周波数探索処理における最大の相関値の周波数が、前記第１次周波数探索処理における最大の相関値の周波数よりも大きい場合には、前記新たなサイドローブチェック用周波数を、既に実行した前記第２次周波数探索処理における最大の相関値の周波数よりも大きい周波数に設定する、  When the second frequency search execution unit executes the second frequency search process again, the frequency of the largest correlation value in the second frequency search process already executed is the frequency in the first frequency search process. If the frequency is larger than the frequency of the maximum correlation value, the new side lobe check frequency is set to a frequency larger than the frequency of the maximum correlation value in the second frequency search processing already executed.
請求項３に記載の受信装置。  The receiver according to claim 3. 前記第２次周波数サーチ実行部は、前記第２次周波数探索処理を再度実行する時に、既に実行した前記第２次周波数探索処理における最大の相関値の周波数が、前記第１次周波数探索処理における最大の相関値の周波数よりも小さい場合には、前記新たなサイドローブチェック用周波数を、既に実行した前記第２次周波数探索処理における最大の相関値の周波数よりも小さい周波数に設定する、  When the second frequency search execution unit executes the second frequency search process again, the frequency of the largest correlation value in the second frequency search process already executed is the frequency in the first frequency search process. If the frequency is smaller than the frequency of the maximum correlation value, the new side lobe check frequency is set to a frequency smaller than the frequency of the maximum correlation value in the second frequency search processing already executed.
請求項３に記載の受信装置。  The receiver according to claim 3. 前記第２次周波数サーチ実行部は、  The second frequency search execution unit
前記受信信号の信号強度に基づいて、前記第２次周波数探索処理において前記サイドローブチェック用周波数を使用するか否かを判定しかつ、  It is determined based on the signal strength of the received signal whether or not the side lobe check frequency is to be used in the second frequency search processing;
当該判定が前記サイドローブチェック用周波数を使用するとの判定結果であった場合に、前記サイドローブチェック用周波数を含めて前記複数のサーチ周波数それぞれにおいて前記相関演算処理を行い、前記判定が前記サイドローブチェック用周波数を使用しないとの判定結果であった場合には、前記サイドローブチェック用周波数とは異なるサーチ周波数において前記相関演算処理を行う、  If the determination is that the side lobe check frequency is to be used, the correlation calculation process is performed on each of the plurality of search frequencies including the side lobe check frequency, and the determination indicates the side lobe When it is determined that the check frequency is not used, the correlation calculation process is performed at a search frequency different from the side lobe check frequency.
請求項１〜５の何れか一項に記載の受信装置。  The receiver according to any one of claims 1 to 5. 前記第２次周波数サーチ実行部は、前記複数のサーチ周波数を選択する時に、所与の基準周波数をもとにサーチ周波数を選択することに用いるサーチ周波数選択パターンを用いて選択した周波数と、前記サイドローブチェック用周波数とを前記第２次周波数探索処理に用いるサーチ周波数として選択し、  When the second frequency search execution unit selects the plurality of search frequencies, the frequency selected using the search frequency selection pattern used to select the search frequency based on a given reference frequency, and Selecting a side lobe check frequency as a search frequency used in the second frequency search process;
前記捕捉周波数決定部は、前記第３次周波数探索処理を実行する時に、前記第２次周波数探索処理により求まった相関値が最も大きいサーチ周波数を前記基準周波数として前記サーチ周波数選択パターンを用いて前記第３次周波数探索処理における詳細サーチ用周波数を選択し、当該詳細サーチ用周波数それぞれにおいて前記相関演算処理を行う詳細周波数探索処理を実行しかつ、当該詳細周波数探索処理により求まった相関値が最も大きい詳細サーチ用周波数を新たな前記基準周波数として、前記詳細サーチ用周波数の選択と前記詳細周波数探索処理の実行とを繰り返す、  The acquisition frequency determination unit uses the search frequency selection pattern with the search frequency having the largest correlation value obtained by the second frequency search processing as the reference frequency when the third frequency search processing is performed. The detailed search frequency in the third frequency search process is selected, and the detailed frequency search process for performing the correlation calculation process is performed on each of the detailed search frequencies, and the correlation value obtained by the detailed frequency search process is the largest. The selection of the detailed search frequency and the execution of the detailed frequency search process are repeated using the detailed search frequency as a new reference frequency.
請求項１〜６の何れか一項に記載の受信装置。  The receiver according to any one of claims 1 to 6.
JP2010216618A 2010-09-28 2010-09-28 Receiver Expired - Fee Related JP5494394B2 (en)

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JP2011114862A JP2011114862A (en) 2011-06-09
JP2011114862A5 true JP2011114862A5 (en) 2012-01-26
JP5494394B2 JP5494394B2 (en) 2014-05-14

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7308022B2 (en) * 2001-11-01 2007-12-11 Rick Roland R Parameter estimator configured to distinguish between peaks and sidelobes of correlation function
JP3924500B2 (en) * 2002-06-10 2007-06-06 古野電気株式会社 Frequency estimating device and positioning signal receiving device
US6873910B2 (en) * 2002-10-22 2005-03-29 Qualcomm Incorporated Procedure for searching for position determination signals using a plurality of search modes
US7479924B2 (en) * 2005-11-14 2009-01-20 Sirf Technology Holdings, Inc. False reacquisition mitigation in high sensitivity navigational satellite signal receivers
US7656348B2 (en) * 2006-05-19 2010-02-02 Qualcomm Incorporated System and/or method for determining sufficiency of pseudorange measurements
JP2009103489A (en) * 2007-10-22 2009-05-14 Seiko Epson Corp Positioning method, program, positioning device, and electronic device
JP2010286354A (en) * 2009-06-11 2010-12-24 Furuno Electric Co Ltd Device for estimation of doppler frequency, device for capturing and tracking of positioning signal, positioning device, and method of measuring doppler frequency

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