介紹了以DSP為核心的MSINS/GPS分布式控制組合導(dǎo)航計算機(jī)的設(shè)計方法。為降低系統(tǒng)成本，選用TI公司的DSP作為導(dǎo)航算法處理機(jī)，采用TL16C550和MAX3160設(shè)計了RS-232/485/422多協(xié)議串口，實現(xiàn)該系統(tǒng)與主機(jī)的通信。鑒于GPS－OEM板異步串口輸出的
報文在接收時需要進(jìn)行判斷和校驗，采用單片機(jī)單獨控制接收，并將預(yù)處理數(shù)據(jù)存儲到雙口RAM中,節(jié)約CPU的時間。對于MSINS六路數(shù)據(jù)的采集，則采用CPLD作為調(diào)度機(jī)，將A/D轉(zhuǎn)換結(jié)果也放于雙端口RAM中。系統(tǒng)還采用GPS接收機(jī)輸出的1PPS脈沖，結(jié)合CPLD產(chǎn)生的時序?qū)崿F(xiàn)M SINS和GPS數(shù)據(jù)的同步采集。
關(guān)鍵詞： MSINS；GPS；DSP；組合導(dǎo)航；同步
Abstract: The design method of distributing control navigation computer for MSINS/GPS
integrated system based on digital signal processor(DSP) have been introduced in this paper. To reduce the cost, DSP manufactured by Texas Instruments has been selected as navigation
algorithm processor. Multi-protocol UART RS-232/485/422 has been designed based on
TLC16C550 and MAX3160 to realize communication with host computer. As GPS OEM board’s output message from UART needing judge and verify, the system use single chip computer to receive the message and save the pretreatment data to dual-port static RAM to economize the time of CPU. Adopting complex programmable logic device(CPLD) to collect the 6 channels micro inertial measurement unit data, the A/D conversion values have been placed in RAM. Using the 1PPS signal from GPS receiver and combining the time sequence produced by CPLD, the system realizes synchronal data collection to MSINS and GPS.
Key words: MSINS；GPS； DSP；Integrated Navigation System；Synchronization；