This is the source code for GSM - GPS based Vehicle Tracking System done using PIC microcontroller and CCS C Compiler
標(biāo)簽： microcontroller Tracking Vehicle System
上傳時(shí)間： 2014-01-31
上傳用戶：dianxin61
This is schematic and Gerber files of PCB that is used for GPS tracking device with GSM link. Scheme has many valuable schematic features, like protected digital and analog I/Os, power part adapted for car power supply, etc. Can be used as a reference design for anyone who wants to make own GPS GSM tracking system based on SIM508 module from Simcom.
標(biāo)簽： schematic tracking Gerber Scheme
上傳時(shí)間： 2013-12-19
上傳用戶：chfanjiang
Software-defined radios (SDRs) have been around for more than a decade. The first complete Global Positioning System (GPS) implementation was described by Dennis Akos in 1997. Since then several research groups have presented their contributions.We therefore find it timely to publish an up-to-date text on the subject and at the same time include Galileo, the forthcoming European satellitebased navigation system. Both GPS and Galileo belong to the category of Global Navigation Satellite Systems (GNSS).
標(biāo)簽： Software-defined complete Global radios
上傳時(shí)間： 2017-06-08
上傳用戶：wkchong
this is a document about radio frequency identification RFID, this was a project ,i have done last year ,actually this technology is a very inpotrtant one due to its relation with newest technologies , like GPS , or the miniturization of integrated circuits ,and that is described in chapter 3 . chapter 1 gives an introduction of the technology RFID , chapter 2 gives a discussion of a library using RFID , and chapter 3 is about the future of RFID , and finally the conclusion .
標(biāo)簽： this identification frequency document
上傳時(shí)間： 2014-01-10
上傳用戶：gtzj
NEA1803 51單片機(jī)與12864 由串口中斷收取數(shù)據(jù) 顯示經(jīng)度緯度 高度 速度 時(shí)間 使用衛(wèi)星數(shù)-GPS development NEA1803 51 SCM and 12864 collected by the serial interrupt data show a high degree of longitude latitude speed time-use satellite
標(biāo)簽： 12864 1803 development NEA
上傳時(shí)間： 2017-08-22
上傳用戶：lepoke
Software-defined radios (SDRs) have been around for more than a decade. The first complete Global Positioning System (GPS) implementation was described by Dennis Akos in 1997. Since then several research groups have presented their contributions.We therefore find it timely to publish an up-to-date text on the subject and at the same time include Galileo, the forthcoming European satellitebased navigation system. Both GPS and Galileo belong to the category of Global Navigation Satellite Systems (GNSS)
標(biāo)簽： Software-defined complete Global radios
上傳時(shí)間： 2013-12-16
上傳用戶：xauthu
[摘要]在天線單元設(shè)計(jì)中采用了高頻、低噪聲放大器，以減弱天線熱噪聲及前面幾級(jí)單元電路對(duì)接收機(jī)性能的影響；基于超外差式電路結(jié)構(gòu)、鏡頻抑制和信道選擇原理，選用G P2010芯片實(shí)現(xiàn)了射頻單元的三級(jí)變頻方案，并介紹了高穩(wěn)定度本振蕩信號(hào)的合成和采樣量化器的工作原理，得到了導(dǎo)航電文相關(guān)提取所需要的二進(jìn)制數(shù)字中頻衛(wèi)星信號(hào)。[被屏蔽廣告]關(guān)鍵詞：GPS接收機(jī)靈敏度超外差鎖相環(huán)頻率合成利用GPS衛(wèi)星實(shí)現(xiàn)導(dǎo)航定位時(shí)，用戶接收機(jī)的主要任務(wù)是提取衛(wèi)星信號(hào)中的偽隨機(jī)噪聲碼和數(shù)據(jù)碼，以進(jìn)一步解算得到接收機(jī)載體的位置、速度和時(shí)間（PVT）等導(dǎo)航信息。因此，GPS接收機(jī)是至關(guān)重要的用戶設(shè)備。目前實(shí)際應(yīng)用的GPS接收機(jī)電路一般由天線單元、射頻單元、通信單元和解算單元等四部分組成，如圖1所示。本文在分析GPS衛(wèi)星信號(hào)組成的基礎(chǔ)上，給出了射頻前端GP2010的原理及應(yīng)用。1GPS 衛(wèi)星信號(hào)的組成GPS衛(wèi)星信號(hào)采用典型的碼分多址（CDMA）調(diào)制技術(shù)進(jìn)行合成（如圖2所示），其完整信號(hào)主要包括載波、偽隨機(jī)碼和數(shù)據(jù)碼等三種分量。信號(hào)載波處于L波段，兩載波的中心頓率分別記作L1和1.2，衛(wèi)星信號(hào)參考時(shí)鐘頻率f0為10.23MHz，信號(hào)載波L1的中心頻率為ro的154倍頻，即：fL.1=154×f0-1575，42MHz（1）其波長(zhǎng)A 1-19.03cm：信號(hào)載波12的中心頻率為f0的120倍頻，即：fL.2-120X f0-1227.60M1z（2）其波長(zhǎng)A 2-24.42cm.兩載波的頻率差為347.82M1z，大約是12的28.3%，這樣選擇載波頻率便于測(cè)得或消除導(dǎo)航信號(hào)從GPS衛(wèi)星傳播至接收機(jī)時(shí)由于電離層效應(yīng)而引起的傳播延遲誤差，偽隨機(jī)噪聲碼（PR N）即測(cè)距碼主要有精測(cè)距碼（P碼）和粗測(cè)距碼（C/A碼）兩種。其中P碼的碼率為10.23M12、C/A碼的碼率為1.023MHz。數(shù)據(jù)碼是GPS衛(wèi)星以二進(jìn)制形式發(fā)送給用戶接收機(jī)的導(dǎo)航定位數(shù)據(jù)，又叫導(dǎo)航電文或D碼，它主要包括衛(wèi)星歷、衛(wèi)星鐘校正、電離層延遲校正、工作狀態(tài)信息、C/A碼轉(zhuǎn)換到捕獲P碼的信息和全部衛(wèi)星的概略星歷：總電文由1500位組成，分為5個(gè)子幀，每個(gè)子幀在6s內(nèi)發(fā)射10個(gè)字，每個(gè)字30位，共計(jì)300位，因此數(shù)據(jù)碼的波特率為50bps.
上傳時(shí)間： 2022-06-19
上傳用戶：zhaiyawei
GPS原理及應(yīng)用課件
標(biāo)簽： GPS
上傳時(shí)間： 2013-04-15
上傳用戶：eeworm
GPS教學(xué)實(shí)習(xí)
標(biāo)簽： GPS 實(shí)習(xí)
上傳時(shí)間： 2013-04-15
上傳用戶：eeworm
GPS應(yīng)用程序設(shè)計(jì)
標(biāo)簽： GPS 應(yīng)用程序
上傳時(shí)間： 2013-06-29
上傳用戶：eeworm
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