1357745 九、發明說明： 【發明所屬之技術領域】 本發明係有關於衛星信號接收！！，_麵於—種應用於全 球導航衛星系統的自適應性分時多工接收器及相應方法，其中全 球導航衛星系統係以導頻通道與資料通道定位衛星。 【先前技術】1357745 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to satellite signal reception! ! The invention relates to an adaptive time-division multiplex receiver for a global navigation satellite system and a corresponding method, wherein the global navigation satellite system locates the satellite by using a pilot channel and a data channel. [Prior Art]
於接收器檢測擴頻信號所承載之資_間，其中承載資料之 擴頻信號係經由全料航衛緣_心全球定㈣統，全球導 航衛星系統及㈣略系财)所傳送，血需封慮的三個參數： 可見衛星識別碼，都卜勒頻率及碼相位。於冷啟動狀態時，即最 初接收器剛開始運作之時，可見衛星識別碼，都卜勒頻率及碼相 位等參數皆為未知。因此有必要對每—藉由以上三個參數所可能 的形成之組合進行嘗試。其巾狀衛星識別碼，特定之都卜勒頻 率及特定之碼她卿成德合稱為—假歸刺㈣）。對衛星 SVx而言，倘若錢個可能都卜勒頻率_，dfi，脂，…咖小 以及N個碼她CP0, cpi, cp2, ._為例，則存在M X N箱 假設’如第1圖所示。藉此可推導倘若存在⑽衛星哪咖 svm，則存在之假設數目係為χ χ Μ χ N，即如第2 _示，。遷 不理想的情形T，需進行X X Μ X N次相關性運算才能獲取某一 特定鹏信號。於通常應用情況下，大約1/2或ι/4的碼細 達到較南跟蹤命中率所必要的。因此，引入另外一個參數卜若站 間距係為半㈣元時m碼間距係為1/4碼元時m 1357745 此類推，則上述假設之數目為X χ Μ χ Ν χ p。 '- 倘若於—健收器m相關器，則只有逐-驗證所有 •：可能*現之假設，但若此接收财存在__11，則表示接收 器可於同-時間同時處理兩種假設，顯而處理速度係為上述情況 之兩倍。如需提升速度’可藉由增加相_的數目來達成。於此 同時，將導致成本增加以及硬體複雜度的升高。 對GNSS信號而言，虛擬(pseud〇)隨機碼的碼率為ι 〇23ΜΗζ， #亦即於1毫秒時間内共聰_元。若相關器之時脈頻率為 服貝!此相關器需包含1〇23對乘法器與加法器以對所接收到的 信號進行相關性運算。搜尋頻率係為每—假設需—毫秒。再者， 如此種具有1023對乘法器與加法器之相關器，本身實現就很複 雜。另外，將時脈頻率設定為·ζ，亦不便於實現。反之，於本 例中亦可藉由增㈣脈鮮之大小來減少相關器之數量，以達到 同樣之功效。例如，使用33kHz之時脈頻率，則健需31對乘法 φ 器與加法器便能實現同樣之功效。 g如上所述，硬體的複雜度醜可藉由增加雜鮮來解決， ^是對假設的搜尋解仍祕每—毫秒搜尋—假設。對於一特定 =星與特定之都卜勒頻率而言，於碼相位中存在1〇23個假設，倘 右時脈頻率進—步提升至33 kHz X 1023 = 33.759 MHZ，則對所有 =相位饭设皆可於j毫秒時間中完成。於某些應用中，會要求 ^精準度因此採用Μ的碼間距係必要的，對於特定衛星與 特定之都卜勒_而言，碼相位中係存在鳩個假設需要處理，、 此時時脈鮮進—步提升至33.759脸X 2 = 67.51隨2，則對所 切7745 f的碼触假設皆可於1毫秒_中絲。隨著軸_的增加， • °己隐體谷里亦需隨之增加。不過，與乘法器及加法器相比，記憶 :體之成本她。進—步增加雜頻耗可聽地為各 多路搜索能力，以適應不同的應用需求。 女排 、、於某些GNSS系統中，如歐洲使用的伽利略系統，定義兩種 通道’亦即導頻通道與資料通道，導頻通道中無任何資料本身之 訊息’亦即沒有與導航資料有_資訊係承載於導頻通道中，導 麵航資料係被承載於資料通道中。經由導頻通道傳輸之信號係被稱 為導頻信號’並且導頻信號係對接收器所識別。藉由將導頻信號 作為-辅师訊’將麟長输秒_干齡達到 跟縱精度。 【發明内容】 "因此，為有效解決以上所述之技術問題，本發明提供了一種 自術星接收第一通道與第二通道之方法及接收器。 本發明揭示-種接收器，用於自—衛星接收—第—通道血一 第二通道’第-通道包含至少—已知參數、不同於第二通道之至 夕相異參數’及與第二通道朗的至少—共同參數這些參數 之特定組合構成-假設’接收器包含：—相關器，用以猶一相 關性運算；-時脈控㈣’控制相關器之一時脈頻率；以及一控 制單元，將於—特定咖可嘗試之全部假設數目.提供至時脈” 器，使得時脈控制器依據全部假設數目控制相關器之時脈頻率， 時脈控制綠置-假設分配來指秘特定時射細㈣衛星之 1357745 第一與第二通道之假設執行相關性運算；全部假設數目係依據這 些參數而分配。 . 本發明同樣揭示一種自一衛星接收一第一通道與一第二通道 之方法’第-通道包含至少—已知參數、不同於第二通道之至少 -相異參數以及與第二通道共同的至少—共同參數，這些參數之 組合構成-假設，包含：設置一假設分配以指示對第一與第二通 道之14些假設執行之相關性運算，這些假設係依據這些參數而分 • 配，以及依據假設分配來對每一假設執行相關性運算。 依據本發明之減ϋ及減方法，同—衛星之導頻通道與資 料通道係被視為兩個不·同之衛星而處理。其中大部分的相_資 源係分配用來接入並跟蹤導頻通道，以取得衛星之碼相位及都卜 勒頻率資訊’利用此等資訊便可解調變承載於該衛星之 上的資料’進而大大提高系統效能。 【實施方式】 為讓本發明之上述和其他目的、特徵、和優點能更明顯易僅， 下文特舉出較佳實施例，尬合所關式，作詳細說明如下： 如上述’分時多工接收器需進行相關性運算的次數為χ X Μ χ Νχρ。假設時脈頻率係硬體多工頻率的W(例如：具有31對乘 去器與加法器的相關器之頻率為33kHZ)。_多工傳輸的等式如 下： Κ>=ΧχΜχΝχρ ⑴ 其中Μ係指於都卜勒頻率範圍内所要嘗試的假設數目，n係 指於碼她朗崎要#簡假設數目。？低需滿足之 精度，如上述，p=2表示·距係為1/2碼元大小，p 碼=係為1/4碼元大小。X係表示需嘗試的衛星數目汶係表 於一毫秒時間可嘗試的假設數目。 於K為固定值之情形下，分時多工 總安排所要f試_㈣例說明，若KP=2Q46，== -毫秒時間嘗試綱6健設數目。職積組合的κ可表示為：卜 1 X助X 2。即表明於―毫秒時間中，關於—特稍星與一特定 之都卜勒頻率之1〇23個碼相位假設係以具有1/2碼間距之精準产 來進行嘗試。於某些情釘’碼相位範圍是已知的，因此沒有^ 要於碼她朗内嘗試财的假設。修，_組合κ可表示為： 3 341 X 2。即表明於一毫秒時間中，基於三種都卜勒頻率下 對682個碼她以具有1/2碼間距之精準絲進行嘗試。 於搜索到魅錢後，搜索進程進㈣衛星信舰行跟縱， 此時碼相位已鎖定，並無需搜尋如此多的碼相位假設。則乘積組 合Κ可表示為：u χ 3 χ 15 χ 4。即表明於一毫秒時間中，^個衛 星係被搜尋，對每-瓣星而·I·，細具有1/4 _距之精準度對 基於三種不_卜勒鮮，及供選擇的15碼相位之假設進行嘗 忒。如上述，適當地分配乘積組合以適應於固定時脈頻率的運作 模式下。該方法被稱之為固定速率自適應域 (fix-rate-adaptive-domain)。 然而，在實踐中，時常沒有必要於碼相位範圍内搜索15個假 設，亦沒有必要在3個不同的都卜勒頻率上進行搜索。另外，有 1357745 的並不需要搜索這麼多顆衛星。再者，有時並不需要搜索這麼多 .·顆衛星。如果可以省略這種不必要的進程，則接收器的功能損耗 可顯著減輕。 於另-情形下，κ係可變的，時脈頻率係隨模式的調整而改 變。例如’於衛星搜索模式下，接收器需要儘快獲取衛星信號， 因此，通常會使用-更高的時脈頻率。若於衛星追縱模式下，會 使用-較低的時脈頻率以減少能f損耗。該方法被稱之為自適應 •速率自適應域(adaptive-rate-adaptive_domain；) 〇 如上所述，有些全球導航衛星系统，如伽利略系統，具有用 ^衛星通訊的導频通道與資料通道，亦即每—衛星传输两种信 可，導頻信号和資料信号。對同样的衛星而言，導頻通道和資料 通道使用不同的;只别码，例如不同的虛擬隨機碼^因此，於本發 明中’提出的來自同-衛星的導频通道和f料通道可依據分時多 工方法而被视为係各別具有導魏道和資料通道_个衛星。该 方程可以表示为： Κ>=(Χρ+ΧφχΜχΝχρ (2) 其中’ Xp與Xd分別表示對導頻通道與資料通道分配各自對 應之相關性運算時槽。 對同一衛星而言，儘管經由導頻通道與資料通道分別進行傳 輸的導頻信號與資料信號皆係以不同之虛擬隨機瑪進行編碼，但 疋導頻通道與資料通道之其他諸如都卜_移、碼相位等參數係 為相同，亦即除虛擬隨機哚聲碼對應之參數外，關於衛星的導頻 通道與資料通道之其他參數，例如都卜勒頻率與碼相位係為相 同。因此倘若將同—衛星之導頻通道與資料通道視為不同衛星之 通道則必齡導致_性運㈣源的浪費。 如上所述，導頻信號是已知的，而接收並跟蹤特定衛星之導 頻通道的導齡號係可行的’並藉由湘諸如都卜細移與碼相 位等自導頻通道獲取之信息，來跟蹤資料通道所承載的資料。接 收器的衛星跟蹤迴路可分配大多數相關性運算資源來對導頻通道 的導頻信號進行相關性運算以接收並跟蹤導頻通道。當資料通道 始解擴頻(dispreading)及解調變資料位元時，衛星跟蹤迴路僅需 跟蹤同-衛星之資料通道。大部分__#源齡關來接收 並跟蹤導頻通道，而小部分的相關性資源係被分配為解擴頻及解 凋變承載於同一衛星之資料通道上的資料。 第3圖係顯示依據本發明實施例之利用分時多工分配複數個 假設的示意圖。於此例中，K=2〇46，即表明時長係為1毫秒，嘗 試2046個假設。係以分時多工方式對2046個假設進行嘗試的。 例如於一個時槽間對一個假設進行嘗試，對假設的複用方式在衛 星之各別域、都卜勒頻移、碼相位及碼間距係被設置為11 X 3 X 31 χ2。亦即表明共有η個衛星之假設被嘗試。對每一衛星而言， 係以3種都卜勒頻率與31個碼相位進行嘗試，並且碼間距係為1/2 碼元。但31個碼相位假設數目卻太多。依據本發明，僅分配小部 分碼相位假設來處理資料以實現導航，而其餘之假設係被用於接 收並跟蹤導頻信號。例如：對每一衛星而言，共需嘗試3 X 31 χ 2 =186個假設。於186個假設中(SV0〜SV10)中，其中180個假設 (ΗΥ1 〜ΗΥ 180, ΗΥ187〜ΗΥ366,…，ΗΥ1861 〜ΗΥ2040)係用來對導 1357745 頻信號進行相關性計算的，而剩余的6個假設(Ηγΐ81〜Ήγΐ86, HY367〜ίίΥ：372’…，ΗΥ2041〜HY2046)係分配用來擴展資料通道承 載之資料。第3圖中’-系列衛星名(SVG〜SV1G)之後綴字母”ρ” 與”d”係分職轉親道與資料通道。舉舰明絲處理資料 之假設係以設置成碼相位CPG來進行，但其他不同之設置亦有可 能，主要係依據實際情況對其進行設置。例如，同樣可設置對應 於碼相位CP8的部分假設並發送以處理資料。 第4圖係顯示依據本發明之GNSS接收器的結構示意圖，其 中包含位於後部分之基帶端3GG。以下將結合第3目進行說明，接 收器包含一用以處理射頻信號之射頻前端1〇〇，一接收控制器2〇〇 以及-基帶端300。射頻前端勘接收經擴頻編碼之GNSS信號 (如.伽利略信號），並將這些信號轉換中頻(IF)信號，其中中頻信 號係被傳送至基帶端3GG。以上錢包含關於每—個可接收衛星之 導頻信號與資料信號。町料細具作流程。 每一中頻率k號係被傳送至基帶端3〇〇中之載波混頻器/副載 波移除器310 ’其中載波混頻器/副載波移除器31〇之載波混頻部 分以經由數位控制振蕩器c〇ntr〇1丨ed 〇sdllatopNc〇) 產生之載波信號混頻中頻信號’⑽中頻信號轉換為基頻信號。 另外’載波混頻器/副載波移除器31〇之副載波移除器部分係用以 移除信號中之副載波。同樣地，亦可啊移除信號之毅與副載 波’以上僅為舉例朗，任何可適驗移除毅與副毅之方法 皆可運用於本發明巾。碼產生器324利驗由編碼數位控制振蕩 器322產生之碼時脈(c〇de d〇ck)，以產生虛擬隨機噪聲碼。為獲 1357745 ==號，錄剛_输_㈣齡號的虛擬 ”碼_接_信號進行相關性計算。時脈控制器3〇6係 2 θ供具有K時脈速度之時脈信號。相關器326依據時脈信 執仃相關性計算，其中提供時脈速度Κ之操作亦可為接收器内 部固有之操作。相關器326包含混碼器(未顯示)與累加器(未顯 不），错由触賴絲蝴基絲繼親麵制信號並 對f加後結果求積分，亦即相關器326對基頻信號執行一相關性 計算。於作相關性計算之前，相關器326接收一關於乘積组合K 的指令，並依據該指示進行相關性計算，該經由控制單元綱產 生之指令係有關於乘積組合κ的指令，關於乘積組合K的說明詳 見說明書後續内容。控制單元綱可以係内置於控制器200，亦可 以係設置於外部其他硬體電路、娜巾钱由軟體實現。 於本實施例中，控制單元204係内置於控制器200中。藉由 相關器326輸出之積分結果係被儲存於記憶體35〇中，獲取結果 判決器330判斷是否已取得相關器326輸出之積分結果；若已取 得，獲取結果判決器330觸發信號跟蹤操作。因為於跟縱模式中 搜尋速度沒有必要非常之大，所以會適當降低時脈頻率。另外， 於跟蹤模式下亦可適當限缩碼相位域之範圍與都卜勒頻率域之範 圍。因此，藉由改變乘積組合κ係可用以調整相關器326之分時 多工方式。獲取結果判決器330經由載波迴路控制器318與編碼 迴路控制器328將一反饋信號分別發送至載波數位控制振蕩器 312與編碼數位控制振蕩器322 ’藉此於瑪相位域與都卜勒頻率域 内跟縱信號。資料抽取器340係依據相關器326之輸出，並從輸 13 比 7745 入"is號中抽取資料。 .- 若自-特定衛星獲取導頻錢，即已獲得猶星之都卜勒頻 :^、‘14目位’同樣地，亦已麟該衛星之資料通道，控制相關器 6於所指定假設之時勘對資料通道之:越進行侧性計算，以 解擴頻資料。於本例中，係將最後6恤設分配至每— 處理資料。 如上所述’時脈控彻3G6提供具有κ時脈速度之時脈信號。 鲁其中時脈速度係為固定不變或係為可變的。倘若係為可變之時脈 速度’時脈控彻306接收一指令以控制時脈速度與相關器汹 之運作速度’其中該指令係關於由控制單元2〇4提供之乘積組合 Κ。。時脈控制器306包含一計數器(未顯示），相關器似依據該; 數器所紀錄之數目以執行相關性計算。 印一併參考第3圖’若該計數器顯示存在衛星sv〇之自肋 至HY180的假設，則執行相關性計算；而若該計數器顯示存在之 • 假設係自HY181至HY186,相關器汹則對資料執行相關性計算。 藉由分料工之原理來處理全料航衛星祕(如··伽利略系 統)之導頻通道或資料通道的方法的流程如第5圖所示。於步驟 S10 ’接收控制器200設置假設分配，其中係確定於一週期時間 (如：lms)内處理資料所需的假設，而剩餘的假設係用以接收並跟 蹤導頻信號。需注意，以上設置係隨時可改變或進行調整的。以 第3圖所π，最後從⑽個假設中剩餘的6個假設係被用以處理 信號資料，而其他的180個假設係被用以接收/跟蹤導頻信號。於 步驟S20 ’接收器接收信號並藉由射頻前端1〇〇來處理射頻信號。 1357745 需注意，此時繼續保持接收信號，而此處流程之順序僅為方便說 .明本發明，所示流程圖中步驟之順序並非為對本發明之限制。於 :步驟S3G ’触11 _導齡狀虛峨機鱗碼吨行相關性計 算，獲取結果判決器330觸是否已取得導頻信號(步驟S4〇)，若 尚未接收導頻信號，則保持相關性計算以接收導頻信號；若已接 收導頻is號，則跟蹤該導頻信號。除此之外，皆已獲得導頻信號 之都卜勒頻率與碼相位。如上述，對於一特定衛星而言，關於導 • 頻通道與資料通道之都卜勒頻率與碼相位皆相同。亦即等同於資 料通道被獲取。於步驟S50，相關器326利用已獲取的都卜勒頻率 與碼相位解擴頻，並以所設置的假設分配中特定之假設解調變資 料通道之資料。 於某些情況下，沒有必要嘗試如此多的假設。依據本發明， 相關器326與其他部分組件於分時多工之某些時槽時的狀態係為 空閒。舉例而言，分時多工之時槽數CPn>2_，則接收控制器2〇〇 _ 產生一失能信號TAP—MUTE，以使接收器之部分組件停止運作， 進而減少能量損耗。目前市場上使用的接收器中，主要耗能組件 包含相關裔與έ己憶體草元。因此，於本發明實施例中，失能作發 TAP_MUTE係被傳送至時脈控制器306並關閉一相關器時脈、被 傳送至記憶體350並產生關於記憶體之晶片致能信號、被傳送至 相關器326停止其中進行的邏輯通訊。同樣地，失能信號 TAP_MUTE亦可傳送至其他組件，以停止其運行，以達到減少功 耗。因此有關失能信號TAP_MUTE的傳送途徑可根據實際需要而 靈活設置。 15 1357745 上述之實施繼用來例舉本㈣之實施紐，減闡釋本發 明之技觸徵’並_來關本伽之賴範_。任何熟悉此技 術者可輕易完狀改變或解性之鑛關於本㈣所主張之範 圍’本發明之翻保護簡應以申料纖圍為準。 雖然本發明已喻佳實補娜如上，财並_以限定本 發明，任何熟習此技藝者，在猶縣利之精神和細内，當 可作各種之更動觸飾，因此本發明之保護制當視後附之申請 專利範圍所界定者為準。 【圖式簡單說明】 第1圖係顯示特疋彳#星之碼相位域與都卜勒頻率域之假設示 意圖。 第2圖係顯示關於可用衛星之碼相位域與都卜勒頻率域之假 設不意圖。 第3圖係顯示铺本翻實補之细分時多功配複數個 假設的示意圖。 第4圖係顯示依據本發明之GNSS接收器的結構示意圖。 第5圖侧示本發明之基於分時多功處理全球導航衛星系 統之導頻通道或資料通道的方法流程圖。 【主要元件符號說明】 200〜接收控制器； 204〜控制單元； 100〜射頻前端； 300〜基帶端； 16 1357745 306〜時脈控制器； 310〜載波混頻器/副載波移除器 312〜載波數位控制振蕩器； 318〜載波迴路控制器； 322〜編碼數位控制振蕩器； 324〜碼產生器； 326〜相關器； 328〜編碼迴路控制器； 330〜結果判決器； 350〜記憶體。 340〜資料抽取器； 17The receiver detects the information carried by the spread spectrum signal, wherein the spread spectrum signal carrying the data is transmitted through the whole carrier edge, the global navigation satellite system, and the (four) slightly financial system. Three parameters of the seal: visible satellite identification code, Doppler frequency and code phase. In the cold start state, that is, at the beginning of the initial operation of the receiver, the satellite identification code is visible, and the parameters such as the Doppler frequency and the code phase are unknown. It is therefore necessary to try each of the combinations formed by the above three parameters. Its towel-like satellite identification code, the specific metropolitan frequency and the specific code, she Qing Chengde collectively known as - false thorns (four)). For the satellite SVx, if the money may be the frequency _, dfi, fat, ... coffee and N code her CP0, cpi, cp2, ._ for example, there is an MXN box assumption 'as shown in Figure 1. Show. From this, it can be inferred that if there is (10) satellite svm, then the assumed number of hypotheses is χ χ χ χ N, as shown in the second _. In the case of undesired situation T, X X Μ X N correlation operations are required to obtain a specific Peng signal. In normal applications, a code size of approximately 1/2 or ι/4 is necessary to achieve a lower tracking hit rate. Therefore, when another parameter is introduced, the spacing between the stations is half (four) and the m-code spacing is 1/4 symbol, m 1357745, and the number of the above assumptions is X χ Μ Ν χ χ p. '- If it is - the receiver m correlator, then only the --verify all: • possible * current hypothesis, but if the received wealth exists __11, it means that the receiver can handle both hypotheses simultaneously at the same time. The processing speed is obviously twice as high as the above. If you need to increase the speed, you can do so by increasing the number of phases. At the same time, it will lead to increased costs and increased hardware complexity. For GNSS signals, the virtual (pseud〇) random code has a code rate of ι 〇 23ΜΗζ, which is the same as the time of 1 millisecond. If the clock frequency of the correlator is 服贝! This correlator needs to contain 1 〇 23 pairs of multipliers and adders to perform correlation operations on the received signals. The search frequency is - every millisecond. Moreover, if such a correlator with a 1023 pair multiplier and adder is implemented, the implementation itself is complicated. In addition, setting the clock frequency to ζ is also not easy to implement. Conversely, in this example, the number of correlators can be reduced by increasing the size of the pulse to achieve the same effect. For example, using a 33kHz clock frequency, you need 31 pairs of multiply φ and adders to achieve the same effect. g As mentioned above, the complexity of the hardware can be solved by increasing the number of impurities, ^ is the search for the hypothesis is still secret - every millisecond search - hypothesis. For a specific = star and a specific Doppler frequency, there are 1 〇 23 hypotheses in the code phase. If the right clock frequency is further increased to 33 kHz X 1023 = 33.759 MHZ, then for all = phase rice The settings can be completed in j milliseconds. In some applications, it is required that the accuracy of the code spacing is necessary. For a particular satellite and a specific Doppler _, there are two assumptions in the code phase that need to be processed, at this time. Fresh advance - step up to 33.759 face X 2 = 67.51 with 2, then the 7745 f code touch can be assumed to be 1 millisecond _ medium wire. As the axis _ increases, • ° has to increase in the hidden body valley. However, compared with multipliers and adders, memory: the cost of the body. Step-by-step increase of miscellaneous frequency consumption is audibly multi-channel search capability to suit different application needs. Women's volleyball team, in some GNSS systems, such as the Galileo system used in Europe, defines two channels 'that is, the pilot channel and the data channel, and there is no information in the pilot channel itself', that is, there is no navigation data. The information system is carried in the pilot channel, and the navigation data is carried in the data channel. The signal transmitted via the pilot channel is referred to as the pilot signal' and the pilot signal is identified by the receiver. By using the pilot signal as a - auxiliary teacher's message, Lin Long loses seconds and reaches the vertical accuracy. SUMMARY OF THE INVENTION Accordingly, in order to effectively solve the above-mentioned technical problems, the present invention provides a method and a receiver for receiving a first channel and a second channel from a star. The invention discloses a receiver for self-satellite reception - a first channel blood - a second channel 'the first channel contains at least - a known parameter, a different parameter from the second channel, and a second At least the common parameters of the channel rang - a specific combination of these parameters - assuming that the 'receiver contains: - the correlator for the correlation operation; - the clock control (four) 'controls one of the correlator clock frequencies; and a control unit , the number of hypotheses that will be tried by the specific coffee can be supplied to the clock, so that the clock controller controls the clock frequency of the correlator according to the total number of hypotheses, and the clock control is set to green - the hypothesis is assigned to specify the specific time. The projections of the first and second channels of the fine-spread (4) satellites perform correlation operations; all hypotheses are assigned according to these parameters. The invention also discloses a method of receiving a first channel and a second channel from a satellite. 'The first channel contains at least - a known parameter, at least a different parameter different from the second channel, and at least a common parameter common to the second channel, the combination of these parameters The hypothesis includes: setting a hypothesis assignment to indicate correlation operations on the 14 hypothetical executions of the first and second channels, the hypotheses are assigned according to the parameters, and each hypothesis is performed according to the hypothesis assignment Correlation operation. According to the subtractive and subtractive method of the present invention, the pilot channel and the data channel of the same-satellite are treated as two satellites that are not identical to each other. Most of the phase_resources are allocated for connection. Into and track the pilot channel to obtain the satellite code phase and Doppler frequency information 'Using this information to demodulate the data carried on the satellite' to further improve system performance. [Embodiment] The above and other objects, features, and advantages of the present invention will become more apparent and obvious. The preferred embodiments of the present invention are described in the following. The detailed description is as follows: As described above, the time-division multiplexer needs to be correlated. The number of sexual operations is χ X Μ χ Νχρ. It is assumed that the clock frequency is the W of the hardware multiplex frequency (for example, the frequency of the correlator with 31 pairs of multipliers and adders is 33 kHZ). _ multiplex transmission, etc. The formula is as follows: Κ>=ΧχΜχΝχρ (1) where Μ is the number of hypotheses to be tried in the Doppler frequency range, n is the number of hypothetical hypotheses that the code is hers. The accuracy is low, as described above, p =2 indicates that the distance system is 1/2 symbol size, p code = 1/4 symbol size. X indicates the number of satellites to be tried, and the number of hypotheses that can be tried in one millisecond time. In the case of a fixed value, the time-division multiplexing arrangement should be tested _ (four), if KP = 2Q46, == - millisecond time try the number of the number of the 6th. The κ of the job portfolio can be expressed as: X 2. It means that in the "millisecond time", the 1 〇 23 code phase hypothesis about the special star and a specific Doppler frequency is tried with a precision production of 1/2 code spacing. The nail's code phase range is known, so there is no assumption that it is necessary to try the money. Repair, _ combination κ can be expressed as: 3 341 X 2. That is to say, in one millisecond time, based on three Doppler frequencies, 682 codes were tried with precision wires having a 1/2 code pitch. After searching for the charm money, the search process enters (4) the satellite letter ship line, and the code phase is locked, and there is no need to search for so many code phase hypotheses. Then the product combination can be expressed as: u χ 3 χ 15 χ 4. That is to say, in one millisecond time, ^ satellite systems are searched, for each-petal star · I ·, fine with 1/4 _ distance accuracy is based on three kinds of not _ _ _ fresh, and the optional 15 yards The assumption of phase is tested. As described above, the product combination is appropriately allocated to be adapted to the operation mode of the fixed clock frequency. This method is called a fixed-rate-adaptive-domain. However, in practice, it is often unnecessary to search for 15 hypotheses within the code phase range, and there is no need to search on 3 different Doppler frequencies. In addition, there are 1357745 that do not need to search for so many satellites. Moreover, sometimes it is not necessary to search so much. If this unnecessary process can be omitted, the functional loss of the receiver can be significantly reduced. In another case, the κ system is variable and the clock frequency is changed as the mode is adjusted. For example, in satellite search mode, the receiver needs to acquire satellite signals as quickly as possible, so a higher clock frequency is usually used. In the satellite tracking mode, the lower clock frequency is used to reduce the energy loss. This method is called adaptive-rate-adaptive_domain; As mentioned above, some global navigation satellite systems, such as the Galileo system, have pilot channels and data channels for satellite communication. That is, each satellite transmits two kinds of signals, pilot signals and data signals. For the same satellite, the pilot channel and the data channel are used differently; only the code, for example, different virtual random codes. Therefore, in the present invention, the pilot channel and the f channel from the same-satellite can be proposed. According to the time-sharing multiplex method, it is considered to have separate Weidao and data channels. The equation can be expressed as: Κ>=(Χρ+ΧφχΜχΝχρ (2) where 'Xp and Xd respectively represent the correlation operation time slots for the pilot channel and the data channel respectively. For the same satellite, although via the pilot The pilot signal and the data signal respectively transmitted by the channel and the data channel are encoded by different virtual random horses, but the parameters of the pilot channel and the data channel are the same as those of the data channel and the code phase. That is, except for the parameters corresponding to the virtual random chirp code, other parameters of the pilot channel and the data channel of the satellite, for example, the Doppler frequency and the code phase are the same. Therefore, if the same-satellite pilot channel and data channel are used Channels that are considered to be different satellites are inevitably responsible for the waste of the sacred (four) source. As mentioned above, the pilot signal is known, and the pilot number of the pilot channel that receives and tracks the particular satellite is feasible. The information carried by the data channel is tracked by the information obtained by the self-pilot channel such as the fine shift and code phase of Xiang. The satellite tracking loop of the receiver can allocate most phases. The correlation computing resource performs correlation operation on the pilot signal of the pilot channel to receive and track the pilot channel. When the data channel begins to despread and demodulate the data bit, the satellite tracking loop only needs to track The same-satellite data channel. Most of the __# source ages are used to receive and track the pilot channels, while a small number of related resources are allocated to despread and de-emerge data carried on the same satellite data channel. Figure 3 is a diagram showing the use of time-division multiplex to allocate a plurality of hypotheses according to an embodiment of the present invention. In this example, K = 2 〇 46, indicating that the duration is 1 millisecond, and 2046 hypotheses are tried. Try 2046 hypotheses in time-multiplexed mode. For example, try to make a hypothesis between time slots, and the hypothetical multiplexing mode is in the satellite's respective domain, Doppler shift, code phase and code spacing. It is set to 11 X 3 X 31 χ 2. That is to say, the assumption that a total of n satellites is tried. For each satellite, try to use 3 Doppler frequencies and 31 code phases, and the code spacing is 1/2 symbol. But 31 codes The number of bit hypotheses is too large. According to the present invention, only a small portion of the code phase hypothesis is assigned to process the data for navigation, and the rest of the hypotheses are used to receive and track the pilot signals. For example, for each satellite, Try 3 X 31 χ 2 = 186 hypotheses. Among the 186 hypotheses (SV0~SV10), 180 of them (ΗΥ1~ΗΥ180, ΗΥ187~ΗΥ366,...,ΗΥ1861~ΗΥ2040) are used to guide 1357774 The frequency signal is correlated, and the remaining six hypotheses (Ηγΐ81~Ήγΐ86, HY367~ίίΥ:372'...,ΗΥ2041~HY2046) are allocated to extend the data carried by the data channel. In Figure 3, the '-series satellite Names (SVG~SV1G) are suffixed with the letters "ρ" and "d", which are transferred to the relatives and data channels. The assumption that the ship's filament processing data is set to the code phase CPG, but other different settings are also possible, mainly based on the actual situation. For example, a partial hypothesis corresponding to the code phase CP8 can also be set and sent to process the data. Fig. 4 is a view showing the structure of a GNSS receiver according to the present invention, which includes a baseband end 3GG at the rear portion. The following description will be made in conjunction with the third object. The receiver includes a radio frequency front end 1 for processing radio frequency signals, a receiving controller 2A, and a baseband terminal 300. The RF front-end survey receives the spread-spectrum coded GNSS signals (e.g., Galileo signals) and converts the signals to an intermediate frequency (IF) signal, wherein the intermediate frequency signal is transmitted to the baseband terminal 3GG. The above money includes pilot signals and data signals for each of the receivable satellites. The machicho is a fine process. Each medium frequency k number is transmitted to the carrier mixer/subcarrier remover 310 in the baseband terminal 3' where the carrier mixing portion of the carrier mixer/subcarrier remover 31〇 is via the digital bit Control oscillator c〇ntr〇1丨ed 〇sdllatopNc〇) Generated carrier signal mixed IF signal '(10) IF signal is converted to baseband signal. In addition, the subcarrier remover portion of the 'carrier mixer/subcarrier remover 31' is used to remove subcarriers in the signal. Similarly, the signal and the subcarriers can be removed. The above is only an example. Any method that can be used to remove Yi and Yiyi can be applied to the towel of the present invention. Code generator 324 tests the code clock (c〇de d〇ck) generated by coded bit control oscillator 322 to produce a virtual random noise code. In order to obtain the 1357774 == number, the virtual "code_connect__ signal of the just_transmission_(four) age number is recorded for correlation calculation. The clock controller 3〇6 is 2 θ for the clock signal with the K clock speed. The device 326 calculates the correlation according to the clock signal, wherein the operation of providing the clock speed 亦可 can also be an operation inherent to the receiver. The correlator 326 includes a mixer (not shown) and an accumulator (not shown). The error is determined by the touch-fed base signal and the integration of the f-added result, that is, the correlator 326 performs a correlation calculation on the fundamental frequency signal. Before the correlation calculation, the correlator 326 receives a correlation. The product combination K is commanded, and the correlation calculation is performed according to the instruction. The instruction generated by the control unit class has an instruction about the product combination κ. For the description of the product combination K, refer to the following content of the specification. The control unit can be built in. The controller 200 can also be disposed on other external hardware circuits, and the data is realized by the software. In the embodiment, the control unit 204 is built in the controller 200. The integration result output by the correlator 326 is Stored In the memory 35, the acquisition result determiner 330 determines whether the integration result output by the correlator 326 has been obtained; if it has been obtained, the acquisition result decider 330 triggers the signal tracking operation because the search speed in the vertical mode is not necessarily very large. Therefore, the clock frequency can be appropriately reduced. In addition, in the tracking mode, the range of the code phase domain and the range of the Doppler frequency domain can be appropriately limited. Therefore, the correlator 326 can be adjusted by changing the product combination κ system. Time division multiplexing mode. The acquisition result determiner 330 sends a feedback signal to the carrier digitally controlled oscillator 312 and the encoded digital control oscillator 322 ' via the carrier loop controller 318 and the encoding loop controller 328 respectively. And the Doppler frequency domain is followed by a vertical signal. The data extractor 340 is based on the output of the correlator 326, and extracts data from the input "is number from the input 13 . . - if the pilot money is obtained from the specific satellite, It has obtained the Bühler frequency of the Jewish capital: ^, '14 positions'. Similarly, the data channel of the satellite has also been used, and the control correlator 6 is surveyed at the specified hypothesis. Data channel: The more lateral calculation is performed to despread the spread data. In this example, the last 6 shirts are assigned to each data processing. As described above, the clock control 3G6 provides the speed of κ clock. Clock signal. The clock speed is fixed or variable. If it is a variable clock speed, the clock control 306 receives an instruction to control the clock speed and the operation of the correlator. Speed 'where the instruction relates to the product combination provided by the control unit 2〇4. The clock controller 306 includes a counter (not shown) that the correlator relies on; the number recorded by the counter to perform the correlation calculation Referring to Figure 3, if the counter shows the existence of the satellite sv〇 from the rib to HY180, the correlation calculation is performed; and if the counter is displayed, the hypothesis is from HY181 to HY186, and the correlator is Perform correlation calculations on the data. The flow of the method of processing the pilot or data channel of the full-satellite satellite (such as the Galileo system) by the principle of the splitter is shown in Fig. 5. The receiving controller 200 sets a hypothesis allocation in step S10', in which the assumptions required to process the data in a cycle time (e.g., lms) are determined, and the remaining hypotheses are used to receive and track the pilot signals. It should be noted that the above settings can be changed or adjusted at any time. The π remaining in the (10) hypothesis is used to process the signal data, while the other 180 hypotheses are used to receive/track the pilot signal. The receiver receives the signal in step S20' and processes the radio frequency signal by the radio frequency front end. 1357745 It should be noted that the sequence of the steps in the flowcharts shown in the flowcharts of the present invention is not limited to the present invention. Step: Step S3G 'Tip 11 _ age-old imaginary machine scale code ton line correlation calculation, the acquisition result decider 330 touches whether the pilot signal has been obtained (step S4 〇), if the pilot signal has not been received, then keep relevant The calculation is performed to receive the pilot signal; if the pilot is number has been received, the pilot signal is tracked. In addition, the Doppler frequency and code phase of the pilot signal have been obtained. As mentioned above, for a particular satellite, both the pilot frequency channel and the data channel have the same Bucher frequency and code phase. That is equivalent to the acquisition of the data channel. In step S50, the correlator 326 despreads the spread using the acquired Doppler frequency and code phase, and demodulates the data of the variable data channel with a specific assumption in the set hypothesis assignment. In some cases, there is no need to try so many assumptions. In accordance with the present invention, the state of correlator 326 and other components in some time slots of time division multiplexing is idle. For example, when the time division multiplexing time slot number CPn>2_, the receiving controller 2〇〇_ generates a disabling signal TAP_MUTE to stop some components of the receiver, thereby reducing energy loss. Among the receivers currently used in the market, the main energy-consuming components include related and sacred objects. Therefore, in the embodiment of the present invention, the disable TAP_MUTE is transmitted to the clock controller 306 and turns off a correlator clock, is transmitted to the memory 350, and generates a wafer enable signal about the memory, which is transmitted. The correlator 326 stops the logical communication performed therein. Similarly, the disable signal TAP_MUTE can also be transferred to other components to stop its operation to reduce power consumption. Therefore, the transmission path of the disabling signal TAP_MUTE can be flexibly set according to actual needs. 15 1357745 The above implementation is used to exemplify the implementation of this (4), to reduce the technical touch of the invention and to _ the gamma of the gamma. Any mine that is familiar with this technology can easily change the solvability of the mine. The scope of the invention is based on the scope of the invention. Although the present invention has been described as a good example of the above, the company is limited to the present invention, and anyone skilled in the art can make various types of touches in the spirit and detail of the Yuxian Li, so the protection system of the present invention is regarded as a The scope defined in the patent application is subject to change. [Simple description of the diagram] Fig. 1 shows the hypothetical schematic of the phase field of the code #星之之之之之之之地地地地地地。 Figure 2 shows the hypothesis of the code phase domain and the Doppler frequency domain of the available satellites. Figure 3 is a schematic diagram showing the hypothesis of multiple functions in the subdivision of the shop. Figure 4 is a block diagram showing the structure of a GNSS receiver in accordance with the present invention. Figure 5 is a side view showing a flow chart of a method for processing a pilot channel or a data channel of a global navigation satellite system based on time division multiplexing. [Main component symbol description] 200~receiving controller; 204~control unit; 100~RF front end; 300~baseband end; 16 1357745 306~clock controller; 310~carrier mixer/subcarrier remover 312~ Carrier digitally controlled oscillator; 318~carrier loop controller; 322~coded digitally controlled oscillator; 324~code generator; 326~correlator; 328~coded loop controller; 330~result decision maker; 350~memory. 340~ data extractor; 17