WO2011004515A1 - Sps reception device and power saving control method therefor - Google Patents
Sps reception device and power saving control method therefor Download PDFInfo
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- WO2011004515A1 WO2011004515A1 PCT/JP2010/001480 JP2010001480W WO2011004515A1 WO 2011004515 A1 WO2011004515 A1 WO 2011004515A1 JP 2010001480 W JP2010001480 W JP 2010001480W WO 2011004515 A1 WO2011004515 A1 WO 2011004515A1
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- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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Abstract
Disclosed is an SPS reception device which can operate for a long time by reducing current consumption when positioning is executed in an environment in which no SPS signal can be received.
Specifically disclosed is an SPS reception device which receives an SPS signal and performs positioning, the device being provided with an SPS reception unit (2) which generates satellite acquisition information relating to the reception state of the SPS signal, a power saving control determination unit (32) which determines, on the basis of the satellite acquisition information generated by the SPS reception unit (2), whether or not the SPS reception unit (2) is operated in a power-saving mode, and a control setting unit (33) which performs setting for reducing the operating current of the SPS reception unit (2) at the time of positioning based on the SPS signal by the SPS reception device when the operation in the power-saving mode is determined by the power saving control determination unit (32).
Description
本発明は、衛星からの信号を受信して測位を行うＳＰＳ受信装置およびその省電力制御方法に関する。
The present invention relates to an SPS receiver that performs positioning by receiving a signal from a satellite and a power saving control method thereof.
ＳＰＳ（Satellite Positioning System）受信装置は、ＧＰＳ（Global Positioning System）衛星などから送信される測位データを含む電波を受信して現在位置を検出する装置であり、車両の位置を報知するカーナビゲーション装置や位置検出機能を備える携帯電話等に用いられている。衛星から送信される測位データを含む信号を、本明細書ではＳＰＳ信号と称する。
An SPS (Satellite Positioning System) receiving device is a device that detects a current position by receiving radio waves including positioning data transmitted from a GPS (Global Positioning System) satellite or the like. It is used for a mobile phone or the like having a position detection function. A signal including positioning data transmitted from a satellite is referred to as an SPS signal in this specification.
ＳＰＳ信号の受信には比較的大きな電流消費を伴うため、バッテリーで動作するＳＰＳ受信装置を長時間駆動させるには電流の消費を抑制する必要がある。そのため、これまで測位を間欠的に行うＳＰＳ受信装置が提案されてきた（例えば、特許文献１、特許文献２参照）。
Since reception of an SPS signal involves a relatively large current consumption, it is necessary to suppress current consumption in order to drive a battery-operated SPS receiver for a long time. Therefore, SPS receivers that perform positioning intermittently have been proposed so far (see, for example, Patent Document 1 and Patent Document 2).
ここで、測位を間欠的に行う従来のＳＰＳ受信装置について説明する。
Here, a conventional SPS receiver that performs positioning intermittently will be described.
図４は、従来のＳＰＳ受信装置の概略構成を示すブロック図である。ＳＰＳ受信装置１１は、主に、ＳＰＳアンテナ部１、ＳＰＳ受信部２、制御部３、タイマ部４、などで構成される。ＳＰＳアンテナ部１は、電波信号であるＳＰＳ信号を電気信号に変換する。ＳＰＳ受信部２は、ＳＰＳアンテナ部１で受信したＳＰＳ信号を測位演算が行える情報に変換する。制御部３は、ＳＰＳ受信部２で変換された情報に基づいて測位演算を実行し、位置を検出する。また、制御部３は、ＳＰＳ受信部２の電源のＯＮ／ＯＦＦも制御する。
FIG. 4 is a block diagram showing a schematic configuration of a conventional SPS receiver. The SPS receiver 11 mainly includes an SPS antenna unit 1, an SPS receiver unit 2, a control unit 3, a timer unit 4, and the like. The SPS antenna unit 1 converts an SPS signal, which is a radio wave signal, into an electrical signal. The SPS receiving unit 2 converts the SPS signal received by the SPS antenna unit 1 into information that can perform positioning calculation. The control unit 3 executes a positioning calculation based on the information converted by the SPS receiving unit 2 and detects a position. The control unit 3 also controls the power on / off of the SPS receiving unit 2.
タイマ部４は、間欠的な測位を実行するためのタイマである。タイマ部４から出力されるコントロール信号のＯＮ／ＯＦＦにより、制御部３がＳＰＳ受信部２を周期的にＯＮ／ＯＦＦする。制御部３の制御によりＳＰＳ受信部２の受信動作が間欠的に実行されるので、連続して測位を行う場合と比較して電流消費を抑制し、装置のバッテリー駆動時間を長くすることができる。
The timer unit 4 is a timer for executing intermittent positioning. The control unit 3 periodically turns on / off the SPS receiving unit 2 by ON / OFF of the control signal output from the timer unit 4. Since the receiving operation of the SPS receiving unit 2 is intermittently executed under the control of the control unit 3, current consumption can be suppressed and the battery driving time of the device can be lengthened as compared with the case where positioning is performed continuously. .
しかしながら、ビル内等の屋内や地下などにＳＰＳ受信装置がある場合、ＳＰＳ信号が遮断されるため測位を試みても測位を行うことはできないことがあった。上記従来のＳＰＳ受信装置は、このようなＳＰＳ信号を受信できない環境にあっても一律に測位を試みるため、不要に電力を消費してしまうことがあった。
However, when there is an SPS receiver in a building or the like indoors or underground, the SPS signal is cut off, so positioning may not be possible even if attempting positioning. Since the conventional SPS receiving apparatus tries to perform positioning even in an environment where such an SPS signal cannot be received, power may be consumed unnecessarily.
そこで本発明は上記従来の問題に鑑みてなされたものであって、ＳＰＳ信号を受信不可能もしくは困難な環境下で実行される測位時に、電流消費量を低減させることで、長時間動作が可能なＳＰＳ受信装置およびその省電力制御方法を提供することを目的とする。
Therefore, the present invention has been made in view of the above-described conventional problems, and can be operated for a long time by reducing current consumption during positioning performed in an environment where the SPS signal cannot be received or is difficult. An object of the present invention is to provide an SPS receiving apparatus and a power saving control method thereof.
本発明のＳＰＳ受信装置は、ＳＰＳ信号を受信し測位を行うＳＰＳ受信装置であって、前記ＳＰＳ信号の受信状況に関する受信状況情報を生成する受信処理部と、前記受信処理部により生成された受信状況情報に基づいて、前記受信処理部を省電力で動作させるか否かを判定する省電力制御判定部と、前記省電力制御判定部により省電力で動作させると判定された場合、前記ＳＰＳ信号に基づく当該ＳＰＳ受信装置の測位時に、前記受信処理部の動作電流を低減させる動作制御部と、を備える。
The SPS receiver according to the present invention is an SPS receiver that receives an SPS signal and performs positioning, and includes a reception processing unit that generates reception status information related to the reception status of the SPS signal, and a reception generated by the reception processing unit. Based on the situation information, when it is determined by the power saving control determination unit that determines whether or not to operate the reception processing unit with power saving, and the power saving control determination unit, the SPS signal And an operation control unit that reduces the operating current of the reception processing unit during positioning of the SPS receiver based on the above.
上記構成によれば、ＳＰＳ信号の受信が不可能もしくは困難な環境下での測位時に、不要な電流消費を低減して装置の駆動時間を長くすることができる。
According to the above configuration, when positioning is performed in an environment where it is impossible or difficult to receive the SPS signal, unnecessary current consumption can be reduced and the driving time of the apparatus can be extended.
また、本発明のＳＰＳ受信装置は、前記省電力制御判定部が、前記ＳＰＳ信号が受信された衛星の数が所定値未満である場合、前記受信処理部を省電力で動作させると判定する。
In the SPS receiver of the present invention, the power saving control determination unit determines that the reception processing unit is operated with power saving when the number of satellites from which the SPS signal is received is less than a predetermined value.
上記構成によれば、ＳＰＳ受信装置がＳＰＳ信号の受信が不可能もしくは困難な環境下にあることを適切に判定し、受信処理部を省電力モードで動作させるため、不要な電流消費を低減させて装置の駆動時間を長くすることができる。
According to the above configuration, the SPS receiver appropriately determines that the SPS signal cannot be received or is difficult, and operates the reception processing unit in the power saving mode, thereby reducing unnecessary current consumption. Thus, the driving time of the apparatus can be lengthened.
また、本発明のＳＰＳ受信装置は、前記省電力制御判定部が、前記ＳＰＳ信号の品質が所定基準を満たす衛星の数が所定値未満である場合、前記受信処理部を省電力で動作させると判定する。
In the SPS receiver according to the present invention, when the power saving control determination unit causes the reception processing unit to operate at power saving when the number of satellites satisfying a predetermined standard for the quality of the SPS signal is less than a predetermined value. judge.
上記構成によれば、ＳＰＳ受信装置がＳＰＳ信号の受信が不可能もしくは困難な環境下にあることを適切に判定し、受信処理部を省電力モードで動作させるため、不要な電流消費を低減して装置の駆動時間を長くすることができる。
According to the above configuration, the SPS receiver appropriately determines that the SPS signal cannot be received or is difficult, and operates the reception processing unit in the power saving mode, thereby reducing unnecessary current consumption. Thus, the driving time of the apparatus can be lengthened.
また、本発明のＳＰＳ受信装置は、前記受信処理部が、前記ＳＰＳ信号を復調する復調部を複数備え、前記動作制御部が、前記省電力制御判定部により前記受信処理部を省電力で動作させると判定された場合、動作させる前記復調部の数を低減させる。
In the SPS receiver of the present invention, the reception processing unit includes a plurality of demodulation units that demodulate the SPS signal, and the operation control unit operates the reception processing unit with power saving by the power saving control determination unit. If it is determined to be performed, the number of the demodulating units to be operated is reduced.
上記構成によれば、例えばＳＰＳ信号の受信が不可能もしくは困難であった衛星に対応する復調部を停止することにより、更に効率的で電流消費を抑制した測位を実行することができる。
According to the above configuration, for example, by stopping the demodulating unit corresponding to the satellite in which the reception of the SPS signal is impossible or difficult, it is possible to execute the positioning more efficiently and suppressing the current consumption.
また、本発明のＳＰＳ受信装置は、当該ＳＰＳ受信装置の測位を間欠的に行う。
Further, the SPS receiver of the present invention intermittently performs positioning of the SPS receiver.
上記構成によれば、消費電力の抑制が可能な間欠測位において、更に効率的に不要な電流消費を低減し、装置の駆動時間を長くすることができる。
According to the above configuration, unnecessary current consumption can be further efficiently reduced and the drive time of the apparatus can be lengthened in intermittent positioning capable of suppressing power consumption.
また、本発明の省電力制御方法は、ＳＰＳ信号を受信するステップと、前記ＳＰＳ信号の受信状況に関する受信状況情報を生成するステップと、生成された前記受信状況情報に基づいて、前記受信状況情報を生成する受信処理部を省電力で動作させるか否かを判定するステップと、前記受信処理部を省電力で動作させると判定された場合、前記ＳＰＳ信号に基づくＳＰＳ受信装置の測位時に、前記受信処理部の動作電流を低減させるステップと、を有する。
The power saving control method of the present invention includes a step of receiving an SPS signal, a step of generating reception status information regarding the reception status of the SPS signal, and the reception status information based on the generated reception status information. Determining whether or not to operate the reception processing unit for generating power, and when determining to operate the reception processing unit for power saving, when positioning the SPS receiver based on the SPS signal, Reducing the operating current of the reception processing unit.
上記方法によれば、ＳＰＳ信号の受信が不可能もしくは困難な環境下での測位時に、不要な電流消費を低減して装置の駆動時間を長くすることができる。
According to the above method, it is possible to reduce unnecessary current consumption and lengthen the driving time of the apparatus at the time of positioning in an environment where it is impossible or difficult to receive the SPS signal.
本発明によれば、ＳＰＳ信号を受信不可能もしくは困難な環境下で実行される測位時に、電流消費量を低減させることで、長時間動作が可能である。
According to the present invention, it is possible to operate for a long time by reducing the current consumption during positioning performed in an environment where the SPS signal cannot be received or is difficult.
以下、本発明の実施形態におけるＳＰＳ受信装置について図面を用いて詳細に説明する。
Hereinafter, the SPS receiver according to the embodiment of the present invention will be described in detail with reference to the drawings.
図１は、本発明の実施形態におけるＳＰＳ受信装置の概略構成の一例を示すブロック図である。ＳＰＳ受信装置１０は、ＳＰＳアンテナ部１、ＳＰＳ受信部２、制御部３、及びタイマ部４を有して構成される。ＳＰＳアンテナ部１は、ＳＰＳ衛星（以下、単に衛星ともいう）から送信されるＳＰＳ信号を受信する。
FIG. 1 is a block diagram illustrating an example of a schematic configuration of an SPS receiver according to an embodiment of the present invention. The SPS receiving apparatus 10 includes an SPS antenna unit 1, an SPS receiving unit 2, a control unit 3, and a timer unit 4. The SPS antenna unit 1 receives an SPS signal transmitted from an SPS satellite (hereinafter also simply referred to as a satellite).
ＳＰＳ受信部２は、受信した信号をダウンコンバート（降圧）後に復調し、ＳＰＳ信号に基づいてＳＰＳ受信装置の測位を行うためのＳＰＳ測位演算を行うためのＳＰＳ衛星取得情報を生成する。ＳＰＳ衛星取得情報は、具体的には、測位の際にＳＰＳ信号の取得が可能であった衛星の数（以下、受信ＳＰＳ衛星数ともいう）、衛星とＳＰＳ受信装置の間の擬似距離を示す位相情報、衛星周波数情報、ＳＰＳ信号の品質（以下、ＳＰＳ信号品質ともいう）に係る情報などを含む。なお、ＳＰＳ信号品質としては、例えば信号レベルやＳＮＲ（Signal Noise Ratio）が考えられる。ＳＰＳ衛星取得情報はＳＰＳ信号の受信状況に関する受信状況情報の一例であり、ＳＰＳ受信部２は受信処理部の一例である。
The SPS receiver 2 demodulates the received signal after down-conversion (step-down), and generates SPS satellite acquisition information for performing SPS positioning calculation for performing positioning of the SPS receiver based on the SPS signal. Specifically, the SPS satellite acquisition information indicates the number of satellites from which SPS signals could be acquired during positioning (hereinafter also referred to as the number of received SPS satellites) and the pseudo distance between the satellite and the SPS receiver. It includes phase information, satellite frequency information, information on SPS signal quality (hereinafter also referred to as SPS signal quality), and the like. As the SPS signal quality, for example, a signal level or SNR (Signal Noise Ratio) can be considered. The SPS satellite acquisition information is an example of reception status information related to the reception status of the SPS signal, and the SPS reception unit 2 is an example of a reception processing unit.
制御部３は、ＳＰＳ受信部２から出力されたＳＰＳ衛星取得情報に基づいてＳＰＳ測位演算を行うとともに、ＳＰＳ受信部２の動作に係る設定を行う。タイマ部４は、時刻周期をもつタイマであり、測位を間欠的に行うためのトリガとなる。制御設定部３３は、このタイマ情報に基づいてＳＰＳ受信部２のＯＮ／ＯＦＦを設定する。なお、ＳＰＳ受信装置の測位を間欠的に行うことは一例であり、間欠的でなくてもよい。
The control unit 3 performs SPS positioning calculation based on the SPS satellite acquisition information output from the SPS receiving unit 2 and makes settings related to the operation of the SPS receiving unit 2. The timer unit 4 is a timer having a time period and serves as a trigger for intermittent positioning. The control setting unit 33 sets ON / OFF of the SPS receiving unit 2 based on the timer information. Note that intermittent positioning of the SPS receiver is merely an example, and may not be intermittent.
ＳＰＳ受信部２は、ダウンコンバート部２１、復調部２２、衛星取得情報生成部２３、受信制御部２４、を有する。ダウンコンバート部２１は、ＳＰＳ信号をダウンコンバートする。復調部２２は、ダウンコンバートされた信号を復調する。復調部２２は、存在する衛星の数に対応してｎ個（２２１～２２ｎ）設けられている。衛星取得情報生成部２３は、ｎ個の復調部２２の出力からの信号に基づいて、各々のＳＰＳ衛星取得情報を生成し、出力する。受信制御部２４は、制御部３からの制御信号を受けて、復調部２２や衛星取得情報生成部２３など、ＳＰＳ受信部２の受信動作を制御する。
The SPS receiver 2 includes a down-converter 21, a demodulator 22, a satellite acquisition information generator 23, and a reception controller 24. The down-conversion unit 21 down-converts the SPS signal. The demodulator 22 demodulates the down-converted signal. There are n (22 1 to 22n) demodulation units 22 corresponding to the number of existing satellites. The satellite acquisition information generation unit 23 generates and outputs each SPS satellite acquisition information based on signals from the outputs of the n demodulation units 22. The reception control unit 24 receives a control signal from the control unit 3 and controls reception operations of the SPS reception unit 2 such as the demodulation unit 22 and the satellite acquisition information generation unit 23.
また、制御部３は、測位演算部３１、省電力制御判定部３２、制御設定部３３、を有する。測位演算部３１は、ＳＰＳ衛星取得情報からＳＰＳ測位演算を行い、ＳＰＳ受信装置の位置情報を生成する。
The control unit 3 includes a positioning calculation unit 31, a power saving control determination unit 32, and a control setting unit 33. The positioning calculation unit 31 performs SPS positioning calculation from the SPS satellite acquisition information, and generates position information of the SPS receiver.
省電力制御判定部３２は、ＳＰＳ受信部２を省電力で動作させるか否かを所定の判定基準に基づいて判定する。省電力制御判定部３２は、後述する判定方法でＳＰＳ受信装置の位置を判定し、受信不可能もしくは困難な位置にあると判定した場合には、省電力制御信号を出力してＳＰＳ受信部２を省電力モードで動作させる。ＳＰＳ受信装置が受信可能な位置にあるか否かは、例えば、上述のＳＰＳ衛星取得情報のうち、受信ＳＰＳ衛星数やＳＰＳ信号品質が所定レベル以上であった衛星の数などに基づいて判定することができる。具体的な判定方法については後述する。これにより、ＳＰＳ受信装置１０がＳＰＳ信号を受信不可能もしくは困難な環境下にある場合、ＳＰＳ受信部２を省電力で動作させ、電流消費量を抑制することができる。
The power saving control determination unit 32 determines whether or not to operate the SPS receiving unit 2 with power saving based on a predetermined determination criterion. The power saving control determination unit 32 determines the position of the SPS receiving device by a determination method described later, and outputs a power saving control signal and determines that the SPS receiving unit 2 is in a position where reception is impossible or difficult. To operate in power saving mode. Whether or not the SPS receiver is in a receivable position is determined based on, for example, the number of received SPS satellites or the number of satellites whose SPS signal quality is equal to or higher than a predetermined level in the SPS satellite acquisition information described above. be able to. A specific determination method will be described later. Thereby, when the SPS receiver 10 is in an environment where it is impossible or difficult to receive the SPS signal, the SPS receiver 2 can be operated with power saving, and the current consumption can be suppressed.
制御設定部３３は、省電力制御判定部３２がＳＰＳ受信部２を省電力で動作させると判定した場合に、間欠的に実行する測位の少なくとも一部において、ＳＰＳ受信部２の動作電流を低減させる設定を行う。制御設定部３３は、測位演算部３１が出力するＳＰＳ測位演算の経過状態および省電力制御判定部３２が出力する省電力制御信号に基づいてＳＰＳ受信部２の制御設定を行い、制御信号を出力する。従って、制御設定部３３により省電力で動作するよう設定された場合、ＳＰＳ受信部２は所定値よりも電流が小さい低電流で動作する。
The control setting unit 33 reduces the operating current of the SPS receiving unit 2 in at least a part of the positioning performed intermittently when the power saving control determining unit 32 determines to operate the SPS receiving unit 2 with power saving. Set to be The control setting unit 33 performs control setting of the SPS receiving unit 2 based on the progress state of the SPS positioning calculation output from the positioning calculation unit 31 and the power saving control signal output from the power saving control determination unit 32, and outputs a control signal To do. Therefore, when the control setting unit 33 is set to operate with power saving, the SPS receiving unit 2 operates with a low current whose current is smaller than a predetermined value.
なお、本実施形態では、特に明示しない限り、ＳＰＳ信号の受信が不可能であるとは、ＳＰＳ信号の受信が困難であることを含む。
In this embodiment, unless otherwise specified, “unable to receive an SPS signal” includes difficulty in receiving an SPS signal.
次に、上記構成のＳＰＳ受信装置の具体的な動作について説明する。
Next, a specific operation of the SPS receiving apparatus having the above configuration will be described.
はじめに、ＳＰＳ受信装置では、間欠的な測位において、ＳＰＳアンテナ部１により受信されたＳＰＳ信号が、ＳＰＳ受信部２のダウンコンバート部２１によりＩＦ（Intermediate Frequency）信号に周波数変換される。ＩＦ信号に変換されたＳＰＳ信号は、ｎ個の復調部２２によって元の信号がデコードされる。ＳＰＳ信号はＣＤＭＡ（Code Division Multiple Access）方式を用いて送信されているため、復調部２２は、各衛星からの信号の有するＣＤＭＡコードにより逆拡散することで信号をデコードできる。また、復調部２２が逆拡散を行う際のＣＤＭＡコードの位相条件の情報に基づいて、衛星取得情報生成部２３は、衛星とＳＰＳ受信装置間の伝搬遅延に基づく擬似距離も導出する。
First, in the SPS receiver, in intermittent positioning, the SPS signal received by the SPS antenna unit 1 is frequency-converted to an IF (Intermediate Frequency) signal by the down-converter 21 of the SPS receiver 2. The original signal of the SPS signal converted into the IF signal is decoded by n demodulation units 22. Since the SPS signal is transmitted using a CDMA (Code Division Multiple Access) system, the demodulator 22 can decode the signal by despreading using the CDMA code of the signal from each satellite. Further, based on the information on the phase condition of the CDMA code when the demodulator 22 performs despreading, the satellite acquisition information generator 23 also derives a pseudorange based on the propagation delay between the satellite and the SPS receiver.
複数の復調部（２２１～２２ｎ）は、複数の衛星からのＳＰＳ信号を同時に受信するとともに、同一衛星のＳＰＳ信号についても複数の復調部２２を設け、逆拡散時の位相や周波数をシフトしたものを並列に設けて位相／周波数での相関が高い条件を見出して逆拡散（コリレート）を行う。
The plurality of demodulation units (22 1 to 22n) simultaneously receive SPS signals from a plurality of satellites, and also provide a plurality of demodulation units 22 for the SPS signals of the same satellite to shift the phase and frequency during despreading. Despreading (correlation) is performed by finding a condition in which the correlation in phase / frequency is high by providing them in parallel.
次に、衛星取得情報生成部２３は、ｎ個の復調部２２が逆拡散した信号をデコードして得られるデータ（ＧＰＳ信号の場合、アルマナック、エフェメリス、時刻情報等）や逆拡散時の位相／周波数条件から得られる各衛星とＳＰＳ受信装置との間の擬似距離の検出結果を、ＳＰＳ衛星取得情報として制御部３へ出力する。
Next, the satellite acquisition information generation unit 23 decodes the signals despread by the n demodulation units 22 (in the case of GPS signals, almanac, ephemeris, time information, etc.) and the phase / The detection result of the pseudo distance between each satellite and the SPS receiver obtained from the frequency condition is output to the control unit 3 as SPS satellite acquisition information.
制御部３の測位演算部３１は、ＳＰＳ衛星取得情報に基づいて、ＳＰＳ測位演算を行う。ＳＰＳ測位演算の演算結果としての測位位置情報は、測位演算部３１から外部へ出力され、測位位置情報の報知や画像の表示などに供される。また、測位演算部３１は、演算結果の出力と同時に、受信ＳＰＳ衛星数やＳＰＳ信号品質に係る情報を省電力制御判定部３２へ出力する。省電力制御判定部３２は、受信ＳＰＳ衛星数やＳＰＳ信号品質を判定基準と比較し、ＳＰＳ受信部２を省電力で動作させるか否かを判定する。
The positioning calculation unit 31 of the control unit 3 performs SPS positioning calculation based on the SPS satellite acquisition information. Positioning position information as a calculation result of the SPS positioning calculation is output to the outside from the positioning calculation unit 31 and is used for notification of positioning position information, display of an image, and the like. The positioning calculation unit 31 outputs information related to the number of received SPS satellites and SPS signal quality to the power saving control determination unit 32 simultaneously with the output of the calculation result. The power saving control determination unit 32 compares the number of received SPS satellites and the SPS signal quality with the determination criterion, and determines whether or not to operate the SPS receiving unit 2 with power saving.
ここで、省電力制御判定部３２の判定動作について具体的に説明する。
図２（ａ）、（ｂ）は、省電力制御判定部３２が行う判定動作手順の一例を示すフローチャートである。 Here, the determination operation of the power savingcontrol determination unit 32 will be specifically described.
FIGS. 2A and 2B are flowcharts illustrating an example of a determination operation procedure performed by the power savingcontrol determination unit 32.
図２（ａ）、（ｂ）は、省電力制御判定部３２が行う判定動作手順の一例を示すフローチャートである。 Here, the determination operation of the power saving
FIGS. 2A and 2B are flowcharts illustrating an example of a determination operation procedure performed by the power saving
図２（ａ）は、受信ＳＰＳ衛星数に基づいて省電力制御判定を行う場合のフローチャートである。はじめに、省電力制御判定部３２は、測位演算部３１を介して取得したＳＰＳ衛星取得情報のうち、受信ＳＰＳ衛星数に係る情報を参照し、測位開始後所定期間（例えば数秒間）の受信ＳＰＳ衛星数が所定数未満であるか否かを判定する（ステップＳ１０１）。所定数未満である場合、省電力制御判定部３２は、ＳＰＳ受信部２の動作が省電力になるように制御設定部３３へ省電力制御信号を出力する（ステップＳ１０２）。一方、所定数以上である場合、省電力制御判定部３２は、ＳＰＳ受信部２の動作を通常のままとする（ステップＳ１０３）。つまり、省電力とならないようにする。以上の手順では、受信ＳＰＳ衛星数が所定数より少ない場合、ＳＰＳ受信装置がビル内や地下など（ＳＰＳ信号を受信不可能な環境）にあると判断し、ＳＰＳ受信部２の動作を省電力モードに設定（つまりＳＰＳ受信部２の動作電流を低減させるよう設定）する。
FIG. 2 (a) is a flowchart when the power saving control determination is performed based on the number of received SPS satellites. First, the power saving control determination unit 32 refers to the information related to the number of received SPS satellites among the SPS satellite acquisition information acquired via the positioning calculation unit 31, and receives the received SPS for a predetermined period (for example, several seconds) after starting the positioning. It is determined whether the number of satellites is less than a predetermined number (step S101). If the number is less than the predetermined number, the power saving control determination unit 32 outputs a power saving control signal to the control setting unit 33 so that the operation of the SPS receiving unit 2 saves power (step S102). On the other hand, if the number is greater than or equal to the predetermined number, the power saving control determination unit 32 keeps the operation of the SPS receiving unit 2 as normal (step S103). In other words, power is not saved. In the above procedure, when the number of received SPS satellites is less than the predetermined number, it is determined that the SPS receiver is in a building, underground, or the like (an environment where SPS signals cannot be received), and the operation of the SPS receiver 2 is reduced in power consumption. Set to mode (that is, set to reduce the operating current of the SPS receiver 2).
図２（ｂ）は、ＳＰＳ信号品質に基づいて省電力制御判定を行う場合のフローチャートである。はじめに、省電力制御判定部３２は、測位演算部３１を介して取得した衛星取得情報のうち、ＳＰＳ信号品質に係る情報を参照し、所定基準以上（例えば所定の信号レベル以上）であるＳＰＳ信号品質の衛星の数が所定数未満であるか否かを判定する（ステップＳ２０１）。所定数未満である場合、省電力制御判定部３２は、ＳＰＳ受信部２の動作が省電力になるように制御設定部３３へ省電力制御信号を出力する（ステップＳ２０２）。一方、所定数以上である場合、省電力制御判定部３２は、ＳＰＳ受信部２の動作を通常のままとする（ステップＳ２０３）。つまり、省電力とならないようにする。以上の手順では、所定基準以上であるＳＯＳ信号品質の衛星の数が少ない場合、ＳＰＳ受信装置がビル内や地下など（ＳＰＳ信号を受信不可能な環境）にあると判断し、ＳＰＳ受信部２の動作を省電力モードに設定する。
FIG. 2B is a flowchart in the case where the power saving control determination is performed based on the SPS signal quality. First, the power saving control determination unit 32 refers to the information related to the SPS signal quality among the satellite acquisition information acquired via the positioning calculation unit 31, and is an SPS signal that is equal to or higher than a predetermined reference (for example, a predetermined signal level or higher). It is determined whether or not the number of quality satellites is less than a predetermined number (step S201). If the number is less than the predetermined number, the power saving control determination unit 32 outputs a power saving control signal to the control setting unit 33 so that the operation of the SPS receiving unit 2 saves power (step S202). On the other hand, if the number is greater than or equal to the predetermined number, the power saving control determination unit 32 keeps the operation of the SPS receiving unit 2 as normal (step S203). In other words, power saving is avoided. In the above procedure, when the number of satellites having the SOS signal quality equal to or higher than the predetermined standard is small, it is determined that the SPS receiver is in a building, underground, or the like (an environment where SPS signals cannot be received), and the SPS receiver 2 Set the operation to power saving mode.
次に、ＳＰＳ受信装置の具体的な動作についての説明に戻る。
制御設定部３３は、測位演算部３１の測位演算の経過状況に応じて、また、ＳＰＳ受信装置の測位動作の開始、終了の設定やＳＰＳ信号を受信する衛星の設定情報に基づいて、ＳＰＳ受信部２を制御する制御信号を出力する。 Next, the description returns to the specific operation of the SPS receiver.
Thecontrol setting unit 33 receives the SPS signal according to the progress of the positioning calculation of the positioning calculation unit 31, and based on the setting of the start and end of the positioning operation of the SPS receiver and the setting information of the satellite that receives the SPS signal. A control signal for controlling the unit 2 is output.
制御設定部３３は、測位演算部３１の測位演算の経過状況に応じて、また、ＳＰＳ受信装置の測位動作の開始、終了の設定やＳＰＳ信号を受信する衛星の設定情報に基づいて、ＳＰＳ受信部２を制御する制御信号を出力する。 Next, the description returns to the specific operation of the SPS receiver.
The
一方、ＳＰＳ受信部２の受信制御部２４は、制御部３の制御設定部３３からの制御信号を受けて、各々の復調部２２が動作するパラメータ（周波数、位相、「ＰＲＮ（pseudo-random number、疑似ランダム信号をデコードするための符号）コード」）を設定し、復調部２２を動作させる。また、受信制御部２４は、制御設定部３３からの制御信号に基づいて、ダウンコンバート部２１、復調部２２、衛星取得情報生成部２３などを制御し、ＳＰＳ受信部２のＯＮ／ＯＦＦの制御を行う。
On the other hand, the reception control unit 24 of the SPS receiving unit 2 receives the control signal from the control setting unit 33 of the control unit 3, and parameters (frequency, phase, “PRN (pseudo-random number)” , A code for decoding a pseudo-random signal)) is set, and the demodulator 22 is operated. The reception control unit 24 controls the down-conversion unit 21, the demodulation unit 22, the satellite acquisition information generation unit 23, and the like based on the control signal from the control setting unit 33, and controls ON / OFF of the SPS reception unit 2. I do.
タイマ部４がカウントするタイマ周期で制御設定部３３がＳＰＳ受信部２のＯＮ／ＯＦＦの制御を行う場合には、上述した一連の測位は間欠的に実行される。より詳細には、タイマ部４のタイマをトリガ情報として、制御部３は、測位演算部３１による測位が完了するまで、又は一定時間が経過するまで、ＳＰＳ受信部２をＯＮにする。そして、その後測位演算部３１による測位が完了したときにはＳＰＳ受信部２をＯＦＦにする、というＯＮ／ＯＦＦの制御を繰り返す。
When the control setting unit 33 performs ON / OFF control of the SPS receiving unit 2 in the timer cycle counted by the timer unit 4, the above-described series of positioning is intermittently executed. More specifically, using the timer of the timer unit 4 as trigger information, the control unit 3 turns on the SPS receiving unit 2 until positioning by the positioning calculation unit 31 is completed or until a predetermined time has elapsed. Then, the ON / OFF control of turning off the SPS receiver 2 when the positioning by the positioning calculator 31 is completed is repeated.
図３（ａ）、（ｂ）は、本実施形態のＳＰＳ受信装置と従来のＳＰＳ受信装置との、測位時のＳＰＳ受信部２の電流消費の違いを説明するための模式図である。図３（ａ）では、従来のＳＰＳ受信装置について、測位の際の時間経過に対する消費電流の変化を示している。また、図３（ｂ）では、本実施形態のＳＰＳ受信装置について、測位の際の時間経過に対する消費電流の変化を示している。
FIGS. 3A and 3B are schematic diagrams for explaining the difference in current consumption of the SPS receiver 2 during positioning between the SPS receiver of the present embodiment and the conventional SPS receiver. FIG. 3A shows a change in current consumption with respect to time during positioning for a conventional SPS receiver. Further, FIG. 3B shows a change in current consumption with respect to the passage of time during positioning for the SPS receiver according to the present embodiment.
測位は所定期間Tint毎に間欠的に実行されており、測位開始後タイムアウト時間（To）まで測位動作を行い、タイムアウト前に測位が完了した場合には、Toを待たずに測位動作が完了する。図３の例では、（ａ）、（ｂ）いずれも最初の２回（左側からの２つの斜線部分）は測位可能な環境下での動作、次の２回（右側２つの斜線部分）はＳＰＳ信号が受信できず、測位不可能な環境下での動作を表している。最初の２回（図３左側の２回）では、（ａ）、（ｂ）ともにToを待たずに測位動作を完了している。一方、測位不可能な環境下である図３右側の２回では、従来のＳＰＳ受信装置は、測位可能な環境下の場合と同様の電流消費をToまで継続するのに対し、本実施形態のＳＰＳ受信装置は、所定期間（例えばタイムアウトToよりも短い数秒間）においては従来と同様の電流消費であるが、当該所定期間経過時点、即ち、測位不可能と判断された時点で省電力モードへ移行して電流消費量が低減されている。従って、Toまでの残り時間の電流消費量を削減できる。
Positioning is executed intermittently every Tint for a predetermined period, and after the start of positioning, the positioning operation is performed until the timeout time (To). When positioning is completed before the timeout, the positioning operation is completed without waiting for To. . In the example of FIG. 3, both (a) and (b) are the first two times (two hatched portions from the left side) in an environment where positioning is possible, and the next two times (two hatched portions on the right side) This shows the operation in an environment where the SPS signal cannot be received and positioning is impossible. In the first two times (two times on the left side of FIG. 3), both (a) and (b) complete the positioning operation without waiting for To. On the other hand, in the two times on the right side of FIG. 3, which is an environment in which positioning is impossible, the conventional SPS receiver continues to consume current up to To as in the environment in which positioning is possible. The SPS receiving apparatus consumes the same current as in the past in a predetermined period (for example, several seconds shorter than the timeout To), but enters the power saving mode when the predetermined period has elapsed, that is, when positioning is determined to be impossible. The current consumption is reduced by shifting. Therefore, current consumption for the remaining time until To can be reduced.
また、測位の際にＳＰＳ信号の受信が不可能と判断された場合、制御設定部３３は、ＳＰＳ受信部２を省電力モードに設定する際、ＳＰＳ受信部２内の複数の復調部２２１のうち、動作させる復調部２２の数（動作チャネル数）を減じるように設定してもよい。例えば、ＳＰＳ信号の受信が不可能であった衛星に対応する復調部２２を停止し、受信が可能であった衛星に対応する復調部２２のみを動作させ、ＳＰＳ受信部２で動作する復調部２２の数を減らす設定が可能である。これにより、更に効率的で電流消費を抑制した測位を実行することができる。
When it is determined that the SPS signal cannot be received during positioning, the control setting unit 33 sets the plurality of demodulation units 22 1 in the SPS receiving unit 2 when setting the SPS receiving unit 2 in the power saving mode. Of these, the number of demodulating units 22 to be operated (number of operating channels) may be set to be reduced. For example, the demodulation unit 22 corresponding to the satellite incapable of receiving the SPS signal is stopped, only the demodulation unit 22 corresponding to the satellite capable of reception is operated, and the demodulating unit operating in the SPS receiving unit 2 Setting to reduce the number of 22 is possible. This makes it possible to perform positioning that is more efficient and suppresses current consumption.
尚、本実施形態では、受信ＳＰＳ衛星数や所定基準以上のＳＰＳ信号品質の衛星の数を、ＳＰＳ受信部２を省電力で動作させるか否かの判定パラメータとして用いたが、これに限定されるものではなく、ＳＰＳ受信装置がＳＰＳ信号を受信できない環境にあることを判定できるパラメータであって、ＳＰＳ信号から取得可能なものであればどのようなものを用いてもかまわない。また、それらのパラメータを組み合わせて判定を行うようにしてもよい。
In the present embodiment, the number of received SPS satellites or the number of satellites having an SPS signal quality equal to or higher than a predetermined standard is used as a determination parameter for determining whether or not to operate the SPS receiving unit 2 with power saving. Any parameter may be used as long as it is a parameter that can determine that the SPS receiving apparatus is in an environment incapable of receiving the SPS signal and can be acquired from the SPS signal. Moreover, you may make it determine by combining those parameters.
また、本実施形態では、受信ＳＰＳ衛星数や所定基準以上のＳＰＳ信号品質の衛星の数が所定数未満の場合に、ＳＰＳ受信部２を一律の省電力モードで動作させるという判定例について説明したが、これに限定されるものではなく、上記衛星の数に応じて段階的に電流量を低減させ、多段階の省電力モードで動作させてもよい。
Further, in the present embodiment, the determination example in which the SPS receiving unit 2 is operated in the uniform power saving mode when the number of received SPS satellites or the number of satellites having SPS signal quality equal to or higher than a predetermined standard is less than the predetermined number has been described. However, the present invention is not limited to this, and the current amount may be reduced stepwise according to the number of the satellites, and the operation may be performed in a multistage power saving mode.
以上のように、本実施形態におけるＳＰＳ受信装置によれば、ＳＰＳ信号を受信できない環境において実行される測位時に、不要な電流消費を抑え、装置のバッテリー駆動時間を長くすることができる。
As described above, according to the SPS receiver in the present embodiment, unnecessary current consumption can be suppressed and the battery drive time of the device can be extended during positioning performed in an environment where the SPS signal cannot be received.
本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
本出願は、2009年7月9日出願の日本特許出願No.2009-162738に基づくものであり、その内容はここに参照として取り込まれる。 Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2009-162738 filed on Jul. 9, 2009, the contents of which are incorporated herein by reference.
本出願は、2009年7月9日出願の日本特許出願No.2009-162738に基づくものであり、その内容はここに参照として取り込まれる。 Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2009-162738 filed on Jul. 9, 2009, the contents of which are incorporated herein by reference.
本発明は、ＳＰＳ信号を受信できない環境において実行される測位時に、電流消費量を低減させることで、長時間動作が可能なＳＰＳ受信装置等に有用である。
The present invention is useful for an SPS receiver capable of operating for a long time by reducing current consumption during positioning performed in an environment where an SPS signal cannot be received.
１ ＳＰＳアンテナ部
２ ＳＰＳ受信部
３ 制御部
４ タイマ部
２１ ダウンコンバート部
２２１～２２ｎ 復調部
２３ 衛星取得情報生成部
２４ 受信制御部
３１ 測位演算部
３２ 省電力制御判定部
３３ 制御設定部 1SPS antenna unit 2 SPS receiver 3 controller 4 timer unit 21 downconverting unit 22 1 ~ 22n demodulator 23 Ministry satellite acquisition information generation unit 24 receives the control section 31 positioning calculation unit 32 power control determination unit 33 control setting unit
２ ＳＰＳ受信部
３ 制御部
４ タイマ部
２１ ダウンコンバート部
２２１～２２ｎ 復調部
２３ 衛星取得情報生成部
２４ 受信制御部
３１ 測位演算部
３２ 省電力制御判定部
３３ 制御設定部 1
Claims (6)
- ＳＰＳ信号を受信し測位を行うＳＰＳ受信装置であって、
前記ＳＰＳ信号の受信状況に関する受信状況情報を生成する受信処理部と、
前記受信処理部により生成された受信状況情報に基づいて、前記受信処理部を省電力で動作させるか否かを判定する省電力制御判定部と、
前記省電力制御判定部により省電力で動作させると判定された場合、前記ＳＰＳ信号に基づく当該ＳＰＳ受信装置の測位時に、前記受信処理部の動作電流を低減させる動作制御部と、
を備えるＳＰＳ受信装置。 An SPS receiver that receives an SPS signal and performs positioning,
A reception processing unit for generating reception status information related to the reception status of the SPS signal;
A power saving control determination unit that determines whether to operate the reception processing unit with power saving, based on the reception status information generated by the reception processing unit;
An operation control unit that reduces the operating current of the reception processing unit at the time of positioning of the SPS receiver based on the SPS signal when the power saving control determination unit determines to operate with power saving;
An SPS receiver comprising: - 請求項１に記載のＳＰＳ受信装置であって、
前記省電力制御判定部は、前記ＳＰＳ信号が受信された衛星の数が所定値未満である場合、前記受信処理部を省電力で動作させると判定するＳＰＳ受信装置。 The SPS receiver according to claim 1,
The power saving control determination unit is an SPS receiver that determines that the reception processing unit is operated with power saving when the number of satellites from which the SPS signal is received is less than a predetermined value. - 請求項１に記載のＳＰＳ受信装置であって、
前記省電力制御判定部は、前記ＳＰＳ信号の品質が所定基準を満たす衛星の数が所定値未満である場合、前記受信処理部を省電力で動作させると判定するＳＰＳ受信装置。 The SPS receiver according to claim 1,
The power saving control determination unit is an SPS receiving device that determines that the reception processing unit is operated with power saving when the number of satellites satisfying a predetermined standard for the quality of the SPS signal is less than a predetermined value. - 請求項１ないし３のいずれか１項に記載のＳＰＳ受信装置であって、
前記受信処理部は、前記ＳＰＳ信号を復調する復調部を複数備え、
前記動作制御部は、前記省電力制御判定部により前記受信処理部を省電力で動作させると判定された場合、動作させる前記復調部の数を低減させるＳＰＳ受信装置。 The SPS receiver according to any one of claims 1 to 3,
The reception processing unit includes a plurality of demodulation units that demodulate the SPS signal,
The operation control unit is an SPS receiver that reduces the number of the demodulation units to be operated when the power saving control determination unit determines that the reception processing unit is operated with power saving. - 請求項１ないし４のいずれか１項に記載のＳＰＳ受信装置であって、
当該ＳＰＳ受信装置の測位を間欠的に行うＳＰＳ受信装置。 The SPS receiver according to any one of claims 1 to 4,
An SPS receiver that intermittently performs positioning of the SPS receiver. - ＳＰＳ信号を受信するステップと、
前記ＳＰＳ信号の受信状況に関する受信状況情報を生成するステップと、
生成された前記受信状況情報に基づいて、前記受信状況情報を生成する受信処理部を省電力で動作させるか否かを判定するステップと、
前記受信処理部を省電力で動作させると判定された場合、前記ＳＰＳ信号に基づくＳＰＳ受信装置の測位時に、前記受信処理部の動作電流を低減させるステップと、
を有する省電力制御方法。 Receiving an SPS signal;
Generating reception status information related to the reception status of the SPS signal;
Determining whether to operate the reception processing unit that generates the reception status information with power saving based on the generated reception status information; and
When it is determined that the reception processing unit is operated with power saving, the operation current of the reception processing unit is reduced during positioning of the SPS receiver based on the SPS signal;
A power saving control method.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| JP2009162738A JP2011017631A (en) | 2009-07-09 | 2009-07-09 | Sps reception device and power saving control method of the same |
| JP2009-162738 | 2009-07-09 |
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| WO2011004515A1 true WO2011004515A1 (en) | 2011-01-13 |
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| PCT/JP2010/001480 WO2011004515A1 (en) | 2009-07-09 | 2010-03-03 | Sps reception device and power saving control method therefor |
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| CN102967867A (en) * | 2012-11-23 | 2013-03-13 | 苏州海客科技有限公司 | Power saving system and method for global positioning system (GPS) module in intelligent tour guide software automatic broadcast function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9088951B2 (en) | 2011-05-25 | 2015-07-21 | Qualcomm Incorporated | Dynamic feature-aware power management |
| JP2013088356A (en) * | 2011-10-20 | 2013-05-13 | Sony Corp | Information processing apparatus, receiving information server, information processing method, program, and recording medium |
| JP6440837B2 (en) * | 2015-06-08 | 2018-12-19 | 三菱電機株式会社 | Receiver for satellite positioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008196896A (en) * | 2007-02-09 | 2008-08-28 | Mitsubishi Electric Corp | Location positioning device |
| JP2009063451A (en) * | 2007-09-06 | 2009-03-26 | Sony Corp | Positioning device and positioning method |
-
2009
- 2009-07-09 JP JP2009162738A patent/JP2011017631A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008196896A (en) * | 2007-02-09 | 2008-08-28 | Mitsubishi Electric Corp | Location positioning device |
| JP2009063451A (en) * | 2007-09-06 | 2009-03-26 | Sony Corp | Positioning device and positioning method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967867A (en) * | 2012-11-23 | 2013-03-13 | 苏州海客科技有限公司 | Power saving system and method for global positioning system (GPS) module in intelligent tour guide software automatic broadcast function |
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