| As society develops quickly, criminals more and more easily commit crimesacross reginons and their sense of counterreconnaissance has been increased rapidlyas well. How to make use of hi-tech methods to improve ability on solving criminalcases has become an urgent need for police. Electron Orientation technology is one ofimportant technological methods for police investigation. As for urgency ofinvestigation and complexity of civil roads, we are required to have more precise andeffective ability to trace targets. Effeciency of electron orientation determines onsolution on criminal cases. How to build the electronic map with function of preciseorientation is an exact need for police to-deal with all sorts of emergencies and toimprove ability for quick response.This thesis focuses on the research of CDMA GPSOne technology, its protocols,and building the interface between the electronic map and tracing device based on theCDMA GPSOne ASIC. This thesis also focus on basing on the real time display oftraced target moving track on the map, realizing the real time orientation of tracedtarget, displaying the moving track of traced target, and building oriented electronicmap fit for police needs, therefore police work efficiency can be improved.The objective of this thesis is to help decision-makers make most effectivedecisions in minimum duration.By buliding this system,police can be improvedinvestigation ability. |