WO2011024679A1 - 航法メッセージの取得方法、サブフレーム作成方法、航法メッセージ取得プログラム、gnss受信装置、および移動端末 - Google Patents
航法メッセージの取得方法、サブフレーム作成方法、航法メッセージ取得プログラム、gnss受信装置、および移動端末 Download PDFInfo
- Publication number
- WO2011024679A1 WO2011024679A1 PCT/JP2010/063903 JP2010063903W WO2011024679A1 WO 2011024679 A1 WO2011024679 A1 WO 2011024679A1 JP 2010063903 W JP2010063903 W JP 2010063903W WO 2011024679 A1 WO2011024679 A1 WO 2011024679A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- subframe
- word
- navigation message
- acquired
- words
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- 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
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/27—Acquisition or tracking or demodulation of signals transmitted by the system creating, predicting or correcting ephemeris or almanac data within the receiver
Definitions
- the present invention relates to a navigation message acquisition method for decoding a GNSS positioning signal and acquiring a navigation message, a navigation message acquisition program, a GNSS receiver and a mobile terminal using the method and program.
- the GPS positioning signal is received and demodulated to calculate a pseudorange, and a navigation message superimposed on the GPS positioning signal is acquired and used for positioning calculation.
- FIG. 5 is a configuration diagram showing a data configuration of a GPS navigation message.
- the navigation message is transmitted at a bit rate of 50 bps, and has a data configuration in which five frames FF each having a total data bit number of 1500 bits (30 seconds on the time axis) are included in one group and the group is repeated.
- Each frame FF is divided into five subframes SF1 to SF5 each consisting of 300 bits (6 seconds).
- the subframe SF1 which is the head side of the frame FF has satellite health information and the like, the subframes SF2 and SF3 have ephemeris, and the subframes SF4 and SF5 have almanac.
- the same data string is transmitted in each frame FF until the ephemeris is updated by the control segment.
- the subframes SF4 and SF5 having almanacs are different for each frame FF, and are set so that all almanacs can be obtained in 25 frames. Note that the groups of 25 frames constituting the almanac are sequentially repeated.
- Each subframe SF1 to SF5 is composed of 10 words W1 to W10 each consisting of 30 bits (0.6 seconds), and each word W1 to W10 is composed of navigation data in the 24 bits at the head of the subframe SF. Yes, 6 bits on the rear end side are parity bits.
- a synchronization pattern is arranged at the head of the word W1, and the weekly time data (Z count) is included in the word W2.
- Patent Document 1 by substantially differentially demodulating common data between frames, a substantial C / N is improved and a navigation message is effectively acquired.
- Patent Document 2 if a preamble of a subframe is detected and a data string constituting the subframe cannot be obtained by continuous words constituting one subframe, it is obtained intermittently in units of words. When it is detected that all the words constituting the subframe have been acquired, the navigation message is acquired from the subframe.
- the demodulated bit data is discarded in units of subframes until the navigation message can be acquired. Then, the subframe bit data in the new frame is demodulated again, and the process of acquiring the navigation message in units of subframes is repeated.
- GPS receivers are required to have high sensitivity, and a GPS positioning signal with a high C / N of the received signal is not a problem, but even if it is a GPS positioning signal with a low C / N of the received signal, There is a requirement to make navigation messages available for acquisition and tracking.
- the bit position of the preamble is used as a reference, and the data is acquired by performing a parity check on a 30-bit unit, that is, a data unit constituting a word. Data is acquired in units of words. Then, such data acquisition processing is repeated until all words constituting the subframe can be acquired.
- data since data is acquired in units of words, it is more efficient than data acquisition in units of subframes.
- a preamble must be found for each subframe, and processing in units of words cannot be performed. In some cases, acquisition may be almost the same as acquisition in units of subframes.
- An object of the present invention is to provide a GPS receiver and a navigation message acquisition method that can reliably and efficiently acquire navigation messages, particularly ephemeris.
- the present invention relates to a navigation message acquisition method for acquiring a navigation message from a received GNSS positioning signal.
- this navigation message acquisition method when at least one word necessary for acquiring a navigation message in a subframe cannot be acquired at a different timing, the steps of acquiring each word constituting the subframe are acquired. Complementing with the words of the acquired subframe to create a complementary subframe, and acquiring the navigation message based on the complementary subframe.
- this navigation message acquisition method when a supplementary subframe is created from words of a plurality of subframes, a process of acquiring weekly time data included in a specific word of the subframe, and based on the weekly time data And determining which subframe each word constituting another subframe in which the time data of the week cannot be obtained belongs to.
- the navigation message is not acquired and discarded in units of subframes as in the past, but is performed in units of words. This is because each subframe having the ephemeris of the navigation message is set so that the same one is repeatedly transmitted, and each piece of information constituting the ephemeris does not cover a plurality of words. It is used that there is no problem even if acquisition and destruction processing is performed. Then, the navigation message acquisition unit repeats acquisition in units of words in a plurality of frames unless all the words of the predetermined subframe are correctly decoded in one frame. The navigation message acquisition unit arranges each word obtained from a plurality of frames and outputs it as one subframe (complementary subframe) when all the words constituting the predetermined subframe can be correctly decoded.
- the navigation message is efficiently acquired.
- the time data (Z count) within the week included in the HOW word of the GNSS positioning signal (indicating “Hand Over Word”) is used.
- the weekly time data is a numerical value counted up for each subframe and can be uniquely associated with the number of each subframe, so that the subframe can be identified by acquiring the weekly time data.
- each word in the subframe may be identified based on the bit data string of the word W2. it can. Thereby, even if acquisition of a plurality of words constituting a predetermined subframe spans a plurality of frames, it is possible to accurately determine which subframe each word belongs to.
- the present invention also relates to a navigation message acquisition method for acquiring a navigation message from a received GNSS positioning signal.
- this navigation message acquisition method when at least one word necessary for acquiring a navigation message in a subframe cannot be acquired at a different timing, the steps of acquiring each word constituting the subframe are acquired. Complementing with the words of the acquired subframe to create a complementary subframe and acquiring a navigation message based on the complementary subframe.
- this navigation message acquisition method when a complementary subframe is created from words of a plurality of subframes, there is a step of causing each word constituting the complementary subframe to have the same phase.
- the complementary subframe is created after performing the phase adjustment process so that each word has the same phase.
- the navigation message acquired from the complementary subframe does not have a phase inversion between words, and an accurate navigation message can be acquired.
- a step of acquiring weekly time data included in a specific word of the subframe Based on this, the step of determining to which subframe each word constituting other subframes for which the time data of the week cannot be obtained belongs and each word constituting the complementary subframe are in phase.
- This method combines the above two methods. Thereby, a navigation message can be acquired efficiently and correctly.
- each word constituting the complementary subframe is in phase based on the bit data string constituting the word and a predetermined number of bit data strings from the last bit of the immediately preceding word. Like that.
- This method shows a specific method for bringing the words constituting the above-described complementary subframe into the same phase.
- the word arrangement by this method if the bit data on the rear end side of the immediately preceding word stored at the same time and the bit data on the rear end side of the word arranged immediately before this word are in phase, The array processing is performed on the assumption that there is no phase inversion between words. On the other hand, if these bit data are out of phase, it is assumed that phase inversion has occurred between words, and the array processing is performed after inversion processing. Thereby, the in-phase processing between words can be performed accurately.
- a step of detecting the start position of the subframe from a unique bit pattern included in the subframe, and a step of specifying the position of each word in the subframe based on the start position And further.
- This method shows a method for specifying a further word position, and utilizes the fact that a unique bit pattern is provided at the head of the subframe. Then, by detecting the head position of the subframe, the word position can be specified based on the bit amount from the head position.
- a complementary subframe is created from the words acquired after the update.
- the subframe is composed of a predetermined number of words, and the word is composed of a bit data string of predetermined bits.
- This method shows a specific subframe data structure.
- the present invention also relates to a method of creating a subframe.
- the method of creating a subframe at least one word required to configure a subframe and a step of acquiring each word configuring the subframe are provided. And subtracting words that cannot be acquired with words of subframes acquired at different timings to create a complementary subframe.
- this subframe creation method when a complementary subframe is created from words of a plurality of subframes, time data included in a specific word of the subframe and time data based on the time data are obtained. Determining which subframe each word constituting another subframe in which the above cannot be obtained belongs to.
- the present invention also relates to a method for creating a subframe.
- a method for creating a subframe When at least one word necessary for obtaining a navigation message in a subframe cannot be obtained, and a step of obtaining each word constituting the subframe. And a step of generating a complemented subframe by complementing the unacquirable words with words of subframes acquired at different timings.
- the subframe creation method includes a step of making each word constituting the complementary subframe in phase when the complementary subframe is created from words of a plurality of subframes.
- the navigation message acquisition method is mainly described.
- a program having each process for realizing the navigation message acquisition method, a GNSS receiving apparatus having a mechanical configuration for realizing the navigation message acquisition method Similar effects can be obtained also in the mobile terminal.
- the navigation message superimposed on the GPS positioning signal can be reliably and effectively acquired. Thereby, even if the reception environment is bad, highly accurate positioning can be performed relatively quickly and reliably.
- FIG. 1 It is a block diagram which shows the main structures of the GPS receiver 100 of embodiment of this invention. It is a flowchart which shows the main flows of the navigation message acquisition part 14. FIG. It is a flowchart which shows the detailed flow of the data generation process of the sub-frame of the navigation message acquisition part 14. FIG. It is a figure which shows the concept of the data formation of a concrete supplementary sub-frame. It is a block diagram which shows the data structure of the navigation message of GPS.
- FIG. 1 is a block diagram showing the main configuration of the GPS receiver 100 of this embodiment.
- GPS is described as an example, but the following acquisition method and configuration can be applied to other GNSSSs that use the same navigation message transmission method.
- the GPS receiver is simply described as an example.
- various mobile terminals for example, mobile phones
- the following acquisition method and configuration can also be applied to telephones, car navigation devices, PNDs, cameras, watches, and the like.
- a GPS receiver having a mechanical configuration for realizing the navigation message acquisition method is shown as an example, but a navigation in which processing for realizing the navigation message acquisition method described in the present embodiment is programmed is described. If the message acquisition program is stored and softwareized, the navigation message acquisition method shown below can be realized by executing the softwareized navigation message acquisition program by a CPU or the like.
- the GPS receiving device 100 includes a positioning signal receiving antenna 11, an RF processing unit 12, a demodulation unit 13, a navigation message acquisition unit 14, and a positioning calculation unit 15.
- the positioning signal receiving antenna 11 receives a radio signal for positioning transmitted from a GPS positioning satellite.
- a radio wave signal for positioning (hereinafter referred to as “positioning signal”) is a signal obtained by spectrum-spreading a carrier wave having a predetermined single frequency using a spreading code and a navigation message set for each positioning satellite.
- the positioning signal receiving antenna 11 converts the received signal into an electrical signal and outputs it to the RF processing unit 12.
- the RF processing unit 12 down-converts the frequency of the received signal, generates a correlated signal including an intermediate frequency signal and a baseband signal having a predetermined frequency, and supplies the correlated signal to the demodulation unit 13.
- the demodulator 13 performs code acquisition processing based on the correlation processing result between the correlated signal and the replica code, and then executes code tracking processing and carrier tracking processing using, for example, Early-Late correlation processing, and Prompt correlation
- the received signal is despread using the processing result.
- the demodulator 13 integrates the despread signal (correlation processing data) to generate a bit data string having a predetermined bit length, and outputs the bit data string to the navigation message acquisition unit 14.
- the demodulator 13 calculates a pseudo distance based on the code tracking result, calculates carrier frequency information based on the carrier tracking result, and performs a positioning calculation on the pseudo distance and the carrier frequency information. To the unit 15.
- the navigation message acquisition unit 14 acquires a navigation message from the bit data string input from the demodulation unit 13 and outputs the navigation message to the positioning calculation unit 15, although a detailed method will be described later. At this time, the navigation message acquisition unit 14 acquires navigation messages in units of words and outputs them in units of subframes. At this time, the navigation message acquisition unit 14 sets weekly time data (Z count) uniquely set for the subframe by the HOW word of the word W2 among the words W1 to W10 constituting one subframe. If it is confirmed that at least the words W3 to W10 used as the navigation data can be acquired, these are output to the positioning calculation unit 15.
- the navigation message acquisition unit 14 stores only the word that has been correctly decoded, and repeatedly executes this processing in a plurality of frames.
- the words W3 to W10 are aligned, they are phase-matched and connected and output to the positioning calculation unit 15.
- the positioning calculation unit 15 performs a positioning calculation based on the navigation message from the navigation message acquisition unit 14 and the pseudo distance and carrier frequency information from the demodulation unit 13.
- FIG. 2 is a flowchart showing a main flow of the navigation message acquisition unit 14.
- the navigation message acquisition unit 14 When the navigation message acquisition unit 14 acquires the bit data string from the demodulation unit 13, the navigation message acquisition unit 14 performs a parity check on the bit data every 30 bits, which is the bit configuration unit of the word, to calculate the leading position of the word (S101). For example, the navigation message acquisition unit 14 repeats the process of acquiring 30 bits from the bit data string and performing the parity check while shifting the bits one bit at a time, and detects 30 bits in which the parity check is OK as one word. The head position of the word is calculated.
- the navigation message acquisition unit 14 calculates the start position of the subframe by comparing the segmented bit data string in units of words with the synchronization pattern set at the start of the subframe (S102). This is based on the fact that in GPS, the word W1 of the subframe has a preset synchronization pattern, and the navigation message acquisition unit 14 compares the detected word with the synchronization pattern. Thus, the word W1 is detected and the head position of the subframe is calculated.
- the navigation message acquisition unit 14 reads the word W2, which is the next word after the word W1 having the calculated subframe head position, and acquires intra-weekly time data (Z count) (S103). By reading out this weekly time data, it is identified which of the subframes SF1 to SF5 in the frame. This makes it possible to determine to which subframe each word belongs.
- the navigation message acquisition unit 14 can identify the subframe and the word by the count value of the counter even when the weekly time data cannot be acquired because the word W2 is determined to be bit data that cannot be correctly decoded. . That is, the navigation message acquisition unit 14 is provided with a counter. Once the weekly time data can be acquired, the counting is started based on the acquisition timing. Here, the sequence of subframes SF1 to SF5 and the sequence of words W1 to W10 of each subframe are unchanged, and the bit rate of the navigation message superimposed on the GPS positioning signal is also constant. Therefore, if the weekly time data can be acquired even once, each subframe and word can be identified by counting at regular time intervals with the timing as a reference.
- FIG. 3 is a flowchart showing a detailed flow of subframe data generation processing.
- the navigation message acquisition unit 14 can accurately decode and acquire the consecutive words W3 to W10 constituting one subframe by identifying the subframes SF1 to SF5 and the words W1 to W10 described above (S401: Yes) ).
- the bit data string composed of these words W3 to W10 and the corresponding weekly time data are output to the positioning calculation unit 15 as a set (S406).
- the navigation message obtaining unit 14 sets and outputs the weekly time data based on the count value described above.
- the navigation message acquisition unit 14 If the navigation message acquisition unit 14 does not have all of the words W3 to W10 constituting the subframe (S401: No), it stores only the bit data of the correctly decoded word (S402). At this time, the navigation message acquisition unit 14 stores the bit data of the word to be stored and the stored bit string M as a set of the two bits on the rear end side in the word immediately before the word to be stored.
- the navigation message acquisition unit 14 repeatedly executes such acquisition processing of the bit data string in units of a plurality of frames until all of the words W3 to W10 constituting the subframe are prepared (S403: No). ⁇ S401).
- the navigation message acquiring unit 14 determines that all of the words W3 to W10 constituting the subframe are prepared (S403: Yes), The phase relationship between W10 is detected and the phase between words is matched (S404). This is because when the reception environment is poor and the C / N is low, the level of the received signal to be tracked (correlated processing signal) is also low, so that the phase is inverted when the phase is locked in the tracking loop. Because there is. In other words, the bit having a relationship of “0, 1” until just before may have a relationship of “1, 0”. For this reason, it is necessary to perform processing for matching these phases.
- the navigation message acquisition unit 14 performs a process (phase matching process) for matching the phases in the order of words W3 to W4, W5,.
- the navigation message acquisition unit 14 acquires the first two bits of the storage bit string M3 including the word W3, and these two bits are both “0”, that is, a bit string of “0, 0”. If so, it is determined that the word W3 is in a non-inverted state. On the other hand, if these two bits are both “1”, that is, a bit string of “1, 1”, the navigation message acquisition unit 14 determines that the word W3 is in an inverted state. This is because the last two bits of the word W2 are always set to “0, 0” in the GPS navigation message. When the navigation message acquisition unit 14 determines that the word W3 is in the inverted state, the bit data “0” is converted into the bit data “1” and the bit data “1”. "Is converted into bit data” 0 ".
- the navigation message acquisition unit 14 acquires the first two bits of the storage bit string Mk including the word Wk (k is an integer of 4 to 10) for each of the words W4 to W10. If these two bits are in phase with the last two bits of the immediately preceding word Wk-1, the navigation message acquiring unit 14 determines that the word Wk is in a non-inverted state. On the other hand, the navigation message acquisition unit 14 determines that the word Wk is in an inverted state if both of these two bits are opposite in phase to the last two bits of the immediately preceding word Wk-1. When the navigation message acquisition unit 14 determines that the word Wk is in an inverted state, the navigation message acquisition unit 14 inverts all the bit data constituting the word Wk.
- the navigation message acquisition unit 14 After performing the phase matching process between the words, the navigation message acquisition unit 14 discards the bit data part for phase matching, that is, the bit data at the rear end of the immediately preceding word stored together with the target word. .
- the navigation message acquisition unit 14 connects W3 to W10 constituting the subframe (S405), and outputs the result together with the weekly time data of the subframe to the positioning calculation unit 15 (S406).
- a subframe composed of words over a plurality of frames corresponds to the “complementary subframe” of the present invention.
- FIG. 4 is a diagram showing a concept of subframe data formation by specific complementation.
- the navigation message acquisition unit 14 stores a storage bit string M3 (n) composed of the last two bits of the word W3 and the word W2, a storage bit string M5 (n) composed of the word W5 and the last two bits of the word W4, A storage bit string M6 (n) composed of the last two bits of the word W6 and the word W5, a storage bit string M8 (n) composed of the word W8 and the last two bits of the word W7, and the last two bits of the word W10 and the word W9
- the navigation message acquisition unit 14 stores a storage bit string M4 (n + 1) composed of the last two bits of the word W4 and the word W3, a storage bit string M5 (n + 1) composed of the word W5 and the last two bits of the word W4, Storage bit string M7 (n + 1) consisting of the last two bits of word W7 and word W6, storage bit string M9 (n + 1) consisting of word W9 and the last two bits of word W8, last two bits of word W10 and word W9 A storage bit string M10 (n + 1) consisting of
- the navigation message acquisition unit 14 overwrites and stores the storage bit string M5 (n + 1) in the storage bit string M5 (n) and stores the storage bit string M10 (n + 1) in the storage bit string M10 (n).
- the navigation message acquisition unit 14 executes the phase matching processing of the words W3 to W10 sequentially from the word W3 when all of the words W3 to W10 of the subframe SF3 are prepared in the Nth frame and the (N + 1) th frame. To do.
- the navigation message acquisition unit 14 detects the first two bits of the stored bit string M7 (n + 1) when detecting the phase of the word W7. Then, it is detected that the phase is opposite to that of the last two bits of the word W6 which has already undergone phase detection.
- the navigation message acquisition unit 14 executes phase inversion processing on all bit data of the storage bit string M7 (n + 1) including the word W7 based on the detection of the reverse phase, and stores it again.
- the navigation message acquisition unit 14 detects the phase of the word W8, the first two bits of the stored bit string M8 (n) are the last two bits of the word W7 that have already undergone phase detection and phase inversion processing. It is detected that the phase is reversed.
- the navigation message acquisition unit 14 performs phase inversion processing on all bit data of the storage bit string M8 (n) including the word W8 based on the detection of the reverse phase, and stores it again.
- the navigation message acquisition unit 14 thus performs phase matching processing so that all the phase relationships of the words W3 to W10 coincide with each other, and then extracts only the word portions from the respective stored bit strings and sequentially connects them to perform positioning. The result is output to the calculation unit 15.
- words that can be correctly decoded are continuous (for example, words W5 and W6 in the Nth frame in FIG. 4), These continuous words may be stored as one storage unit.
- the ephemeris has been described for a certain period.
- the words stored up to the updated timing are collectively discarded, and the word is restarted. Get the. Thereby, it is possible to prevent formation of an inappropriate subframe in which words composed of different ephemeris are combined.
- the method for acquiring the ephemeris has been described.
- this method can also be used for acquiring the almanac. That is, a navigation message data group consisting of 25 frames may be acquired a plurality of times to form complementary frame data as in the above ephemeris.
- a method for creating a subframe including a navigation message has been described.
- a communication signal of a communication system having the above-described word configuration, subframe configuration, and frame configuration can be used without including a navigation message. If so, the above-described subframe creation method can be applied.
- 11-positioning signal receiving antenna 12-RF processing unit, 13-demodulation unit, 14-navigation message acquisition unit, 15-positioning calculation unit
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
Description
図3はサブフレームデータ生成処理の詳細フローを示すフローチャートである。
航法メッセージ取得部14は、上述のサブフレームSF1~SF5およびワードW1~W10の同定により、1個のサブフレームを構成する連続するワードW3~W10を正確に復号して取得できると(S401:Yes)、これらワードW3~W10からなるビットデータ列とこれに対応する週内時刻データとを組として、測位演算部15へ出力する(S406)。この際、航法メッセージ取得部14は、週内時刻データがワードW2から取得できていなければ、上述のカウント値に基づいて週内時刻データを設定して出力する。
図4は具体的な補完によるサブフレームのデータ形成の概念を示す図である。
Claims (14)
- 受信したGNSS測位信号から航法メッセージを取得する航法メッセージ取得方法であって、
サブフレームを構成する各ワードを取得する工程と、
前記サブフレームにおいて前記航法メッセージを取得するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成する工程と、
前記補完サブフレームに基づいて前記航法メッセージを取得する工程と、を有し、
前記補完サブフレームを複数のサブフレームのワードから作成する場合に、
サブフレームの特定ワードに含まれる週内時刻データを取得する工程と、
前記週内時刻データに基づいて、週内時刻データが得られない他のサブフレームを構成する各ワードがいずれのサブフレームに属するかを判断する工程と、
を有する、航法メッセージ取得方法。 - 受信したGNSS測位信号から航法メッセージを取得する航法メッセージ取得方法であって、
サブフレームを構成する各ワードを取得する工程と、
前記サブフレームにおいて前記航法メッセージを取得するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成する工程と、
前記補完サブフレームに基づいて前記航法メッセージを取得する工程と、を有し、
前記補完サブフレームを複数のサブフレームのワードから作成する場合に、
前記補完サブフレームを構成する各ワードが同位相になるようにする工程を、有する航法メッセージ取得方法。 - 請求項1に記載の航法メッセージ取得方法であって、
前記補完サブフレームを複数のサブフレームのワードから作成する場合に、
前記補完サブフレームを構成する各ワードが同位相になるようにする工程を、有する航法メッセージ取得方法。 - 請求項2または請求項3に記載の航法メッセージ取得方法であって、
ワードを構成するビットデータ列と直前のワードの最終ビットから所定数のビットデータ列とに基づいて、前記補完サブフレームを構成する各ワードが同位相となるようにする、航法メッセージ取得方法。 - 請求項1~請求項4のいずれかに記載の航法メッセージ取得方法であって、
サブフレームに含まれる固有のビットパターンからサブフレームの先頭位置を検出する工程と、
前記先頭位置に基づいて、前記サブフレームにおける各ワードの位置を特定する工程と、をさらに有する航法メッセージ取得方法。 - 請求項1~請求項5のいずれかに記載の航法メッセージ取得方法であって、
前記航法メッセージはエフェメリスであり、
該エフェメリスが更新された時、更新後に取得されたワードにより補完サブフレームを作成する、航法メッセージ取得方法。 - 請求項1~請求項6のいずれかに記載の航法メッセージ取得方法であって、
前記サブフレームは、所定数のワードにより構成され、
前記ワードは、所定ビットのビットデータ列により構成されている、航法メッセージ取得方法。 - サブフレームを構成する各ワードを取得する工程と、
前記サブフレームを構成するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成する工程と、を有し、
前記補完サブフレームを複数のサブフレームのワードから作成する場合に、
サブフレームの特定ワードに含まれる時刻データを取得する工程と、
前記時刻データに基づいて、時刻データが得られない他のサブフレームを構成する各ワードがいずれのサブフレームに属するかを判断する工程と、
を有する、サブフレーム作成方法。 - サブフレームを構成する各ワードを取得する工程と、
前記サブフレームを構成するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成する工程と、を有し、
前記補完サブフレームを複数のサブフレームのワードから作成する場合に、
前記補完サブフレームを構成する各ワードが同位相になるようにする工程を、有するサブフレーム作成方法。 - 受信したGNSS測位信号から航法メッセージを取得する処理を実行するための航法メッセージ取得プログラムであって、
サブフレームを構成する各ワードを取得する処理と、
前記サブフレームにおいて前記航法メッセージを取得するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成する処理と、
前記補完サブフレームに基づいて前記航法メッセージを取得する処理と、を含み、
前記補完サブフレームを複数のサブフレームのワードから作成する処理を実行する場合に、
サブフレームの特定ワードに含まれる週内時刻データを取得する処理と、
前記週内時刻データに基づいて、週内時刻データが得られない他のサブフレームを構成する各ワードがいずれのサブフレームに属するかを判断する処理と、
を有する、航法メッセージ取得プログラム。 - 受信したGNSS測位信号から航法メッセージを取得する処理を実行するための航法メッセージ取得プログラムであって、
サブフレームを構成する各ワードを取得する処理と、
前記サブフレームにおいて前記航法メッセージを取得するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成する処理と、
前記補完サブフレームに基づいて前記航法メッセージを取得する処理と、を含み、
前記補完サブフレームを複数のサブフレームのワードから作成する処理を実行する場合に、
前記補完サブフレームを構成する各ワードが同位相になるようにする処理を、有する航法メッセージ取得プログラム。 - 受信したGNSS測位信号から航法メッセージを取得するGNSS受信装置であって、
前記GNSS測位信号をビットデータに復調する復調部と、
サブフレームを構成する各ワードを取得し、前記サブフレームにおいて前記航法メッセージを取得するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成し、該補完サブフレームに基づいて前記航法メッセージを取得する航法メッセージ取得部と、を備え、
該航法メッセージ取得部は、前記補完サブフレームを複数のサブフレームのワードから作成する処理を実行する場合に、前記補完サブフレームを構成する各ワードが同位相になるようにする、GNSS受信装置。 - 受信したGNSS測位信号から航法メッセージを取得するGNSS受信装置であって、
前記GNSS測位信号をビットデータに復調する復調部と、
サブフレームを構成する各ワードを取得し、前記サブフレームにおいて前記航法メッセージを取得するのに必要なワードが少なくとも一つ取得できないときに、該取得できないワードを異なるタイミングに取得されたサブフレームのワードにより補完することで、補完サブフレームを作成し、該補完サブフレームに基づいて前記航法メッセージを取得する航法メッセージ取得部と、を備え、
該航法メッセージ取得部は、
前記補完サブフレームを複数のサブフレームのワードから作成する場合に、サブフレームの特定ワードに含まれる週内時刻データを取得して、該週内時刻データに基づいて、週内時刻データが得られない他のサブフレームを構成する各ワードがいずれのサブフレームに属するかを判断する、GNSS受信装置。 - 自装置位置を利用するアプリケーションを実行する移動端末であって、
請求項12または請求項13に記載のGNSS受信装置を備え、
前記航法メッセージ取得部から得られた航法メッセージと、前記GNSS測位信号の追尾結果とから、自装置位置を測位する測位演算部を、備えた移動端末。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/393,156 US20120154217A1 (en) | 2009-08-31 | 2010-08-18 | Method and program of acquiring navigation message, gnss receiving apparatus, and mobile terminal |
JP2011528748A JP5480906B2 (ja) | 2009-08-31 | 2010-08-18 | 航法メッセージの取得方法、サブフレーム作成方法、航法メッセージ取得プログラム、gnss受信装置、および移動端末 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-199132 | 2009-08-31 | ||
JP2009199132 | 2009-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011024679A1 true WO2011024679A1 (ja) | 2011-03-03 |
Family
ID=43627784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/063903 WO2011024679A1 (ja) | 2009-08-31 | 2010-08-18 | 航法メッセージの取得方法、サブフレーム作成方法、航法メッセージ取得プログラム、gnss受信装置、および移動端末 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20120154217A1 (ja) |
JP (1) | JP5480906B2 (ja) |
WO (1) | WO2011024679A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104181557A (zh) * | 2013-05-24 | 2014-12-03 | 凹凸电子(武汉)有限公司 | 星历收集装置及其方法 |
JPWO2017175294A1 (ja) * | 2016-04-05 | 2018-04-19 | 三菱電機株式会社 | 信号受信装置及び信号受信方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104777490B (zh) * | 2015-03-18 | 2017-12-29 | 广东工业大学 | 一种导航卫星信号接收机及其冷启动方法 |
CN109884671B (zh) * | 2017-12-06 | 2022-02-25 | 上海司南卫星导航技术股份有限公司 | 卫星信号捕获的方法和装置 |
CN110794430A (zh) * | 2019-09-27 | 2020-02-14 | 北京遥测技术研究所 | 一种gps-l1c或bds-b1c频点卫星导航接收机冷启动方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61226668A (ja) * | 1985-03-30 | 1986-10-08 | Japan Radio Co Ltd | Gps航法装置 |
JP2000056007A (ja) * | 1998-08-06 | 2000-02-25 | Matsushita Electric Ind Co Ltd | Gps受信機 |
JP2008170435A (ja) * | 2007-01-05 | 2008-07-24 | Media Tek Inc | 衛星ナビゲーションデータのサブフレームを収集する方法及び装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2900671B2 (ja) * | 1991-11-29 | 1999-06-02 | ソニー株式会社 | Gps受信機 |
US6816710B2 (en) * | 1998-05-06 | 2004-11-09 | Snaptrack, Inc. | Method and apparatus for signal processing in a satellite positioning system |
US8244271B2 (en) * | 2001-05-21 | 2012-08-14 | Csr Technology Inc. | Distributed data collection of satellite data |
US6788249B1 (en) * | 2003-07-23 | 2004-09-07 | Snaptrack Incorporated | System for setting coarse GPS time in a mobile station within an asynchronous wireless network |
US7924947B2 (en) * | 2004-02-06 | 2011-04-12 | Broadcom Corporation | Method and apparatus for decoding satellite navigation data from a satellite positioning system |
KR100594123B1 (ko) * | 2005-05-03 | 2006-06-28 | 삼성전자주식회사 | 이동통신 단말에서 전세계 위치확인 신호의 수신 장치 및방법 |
JP4924017B2 (ja) * | 2006-12-27 | 2012-04-25 | カシオ計算機株式会社 | 位置検出装置および位置検出方法 |
US20090021427A1 (en) * | 2007-07-18 | 2009-01-22 | Tsai Chien-Liang | Receiver and related method for synchronizing data segments by comparing reference time data and time information carried by data segments |
-
2010
- 2010-08-18 US US13/393,156 patent/US20120154217A1/en not_active Abandoned
- 2010-08-18 WO PCT/JP2010/063903 patent/WO2011024679A1/ja active Application Filing
- 2010-08-18 JP JP2011528748A patent/JP5480906B2/ja not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61226668A (ja) * | 1985-03-30 | 1986-10-08 | Japan Radio Co Ltd | Gps航法装置 |
JP2000056007A (ja) * | 1998-08-06 | 2000-02-25 | Matsushita Electric Ind Co Ltd | Gps受信機 |
JP2008170435A (ja) * | 2007-01-05 | 2008-07-24 | Media Tek Inc | 衛星ナビゲーションデータのサブフレームを収集する方法及び装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104181557A (zh) * | 2013-05-24 | 2014-12-03 | 凹凸电子(武汉)有限公司 | 星历收集装置及其方法 |
JPWO2017175294A1 (ja) * | 2016-04-05 | 2018-04-19 | 三菱電機株式会社 | 信号受信装置及び信号受信方法 |
Also Published As
Publication number | Publication date |
---|---|
US20120154217A1 (en) | 2012-06-21 |
JPWO2011024679A1 (ja) | 2013-01-31 |
JP5480906B2 (ja) | 2014-04-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1711841B1 (en) | Method and apparatus for processing satellite positioning system signals to obtain time information | |
US8116354B2 (en) | Sync detection device and method for GNSS | |
TWI452323B (zh) | 用於通信的方法和系統 | |
JP4898844B2 (ja) | 携帯型電子デバイスのための位置決めシステム | |
JP5480906B2 (ja) | 航法メッセージの取得方法、サブフレーム作成方法、航法メッセージ取得プログラム、gnss受信装置、および移動端末 | |
JP2008203266A (ja) | クライアントシステム、ネットワークシステム及び測位方法 | |
US20070096985A1 (en) | System for transmitting position signal | |
US7924947B2 (en) | Method and apparatus for decoding satellite navigation data from a satellite positioning system | |
CN102084265A (zh) | 用于卫星定位系统时间分辨的方法和装置 | |
JPH05150031A (ja) | Gps受信機 | |
US7430196B2 (en) | Transmission systems | |
JP6308406B1 (ja) | 測位装置、測位方法及びプログラム | |
JP2004109133A (ja) | 高感度衛星測位システムレシーバのための合成航法データ | |
JP2008076319A (ja) | 衛星信号判定装置 | |
JP5357451B2 (ja) | 多周波gnss受信装置 | |
US9014304B2 (en) | Demodulation method, demodulation device, and electronic apparatus | |
EP3511741B1 (en) | Positioning receiver | |
US8908805B2 (en) | Signal receiving method and receiver with error detection and correction | |
EP1184674A1 (en) | A method of aligning predicted navigation information | |
JP2012145342A (ja) | メッセージデータ受信方法、メッセージデータ受信プログラム、メッセージデータ受信装置、gnss信号受信方法、gnss信号受信プログラム、gnss信号受信装置、および移動端末 | |
CN111049606B (zh) | 一种gnss接收机快速帧同步的方法及系统 | |
CN113721275B (zh) | 一种北斗b1c信号导航电文帧同步及解码方法 | |
Hegarty et al. | Status of RTCA Activities for the Future GPS Signal at L5 | |
WO2017175294A1 (ja) | 信号受信装置及び信号受信方法 | |
JP2003084056A (ja) | 測位用信号受信装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10811729 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011528748 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13393156 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 10811729 Country of ref document: EP Kind code of ref document: A1 |