长春理工大学学报（自然科学版）
長春理工大學學報（自然科學版）
장춘리공대학학보（자연과학판）
Journal of Changchun University of Science and Technology
2015年
5期
97-100
,共4页
导航%精密测距码%粗测距码%捕获%引导
導航%精密測距碼%粗測距碼%捕穫%引導
도항%정밀측거마%조측거마%포획%인도
navigation%P code%C/A code%acquisition%led
针对GPS系统P码(Precision Code)信号多普勒频移大、码周期长和速率高的特点带来的捕获慢且资源消耗较多的问题,提出了一种新的基于GPS C/A (Coarse/Acquisition Code)码引导P码捕获的方法.系统首先完成C/A码捕获,然后向新型P码发生器置入引导信号zv_set,在接下来的第1个1.5s码周跳变沿对V1和V2置入计数初值;在码同步信号的驱动下,V1和V2进行循环计数,等到V2=0时,P码码值正确,返回引导完成标志.通过仿真分析,该方法资源占用率减少了50%.结果表明该方法可有效避免繁琐的运算,适用于星载GPS双频导航接收机设计.
針對GPS繫統P碼(Precision Code)信號多普勒頻移大、碼週期長和速率高的特點帶來的捕穫慢且資源消耗較多的問題,提齣瞭一種新的基于GPS C/A (Coarse/Acquisition Code)碼引導P碼捕穫的方法.繫統首先完成C/A碼捕穫,然後嚮新型P碼髮生器置入引導信號zv_set,在接下來的第1箇1.5s碼週跳變沿對V1和V2置入計數初值;在碼同步信號的驅動下,V1和V2進行循環計數,等到V2=0時,P碼碼值正確,返迴引導完成標誌.通過倣真分析,該方法資源佔用率減少瞭50%.結果錶明該方法可有效避免繁瑣的運算,適用于星載GPS雙頻導航接收機設計.
침대GPS계통P마(Precision Code)신호다보륵빈이대、마주기장화속솔고적특점대래적포획만차자원소모교다적문제,제출료일충신적기우GPS C/A (Coarse/Acquisition Code)마인도P마포획적방법.계통수선완성C/A마포획,연후향신형P마발생기치입인도신호zv_set,재접하래적제1개1.5s마주도변연대V1화V2치입계수초치;재마동보신호적구동하,V1화V2진행순배계수,등도V2=0시,P마마치정학,반회인도완성표지.통과방진분석,해방법자원점용솔감소료50%.결과표명해방법가유효피면번쇄적운산,괄용우성재GPS쌍빈도항접수궤설계.
Because of the GPS P code's own features: longer Doppler shift,longer duration and higher speed,there is more resource and time consumption in the traditional GPS P code acquisition. A new P code acquisition method base on C/A code guide is proposed to resolve the problem. The system first finish the acquisition of C/A code,then en-able the zv_set guide signal in the new type P code generator, set the initial value of V1 and V2 counter until the first 1.5s code cycle's edge arrived. The V1 and V2 start cycle count under the code synchronization signal drive, the P code is generated and the guide end flag is enabled when the V2 reached to zero. Simulation result shows that the method reduced 50% resource consumption,suitable for satellite dual-frequency GPS navigation receivers.
