초록 ▼

The improved vehicle navigation system can take advantage of the recent availability of low cost micro-machined and piezoelectric sensors, and partially overcomes the low dynamics and line of sight limitations of GPS receivers without resorting to the hard wired approach described above. The low cos

The improved vehicle navigation system can take advantage of the recent availability of low cost micro-machined and piezoelectric sensors, and partially overcomes the low dynamics and line of sight limitations of GPS receivers without resorting to the hard wired approach described above. The low cost sensors introduce system level errors due to their inherent DC offset and drift rates. The improved vehicle navigation system minimizes both the sensor induced errors and GPS low dynamic limitations by using a zero motion detection system as a self contained (within the navigation system), vehicle independent device.

대표청구항 ▼

[ I claim:] [14.] An improved navigation system comprising:a GPS receiver which provides GPS velocity information, said navigation system using GPS velocity information to propagate a previous position to a current position, said system determines east and north displacements from said GPS velocity

[ I claim:] [14.] An improved navigation system comprising:a GPS receiver which provides GPS velocity information, said navigation system using GPS velocity information to propagate a previous position to a current position, said system determines east and north displacements from said GPS velocity information and applies said east and north displacements to said previous position to obtain said current position; andan orthogonal axes accelerometer providing longitudinal and lateral acceleration information, said vehicle navigation system determines longitudinal and lateral calibration information from said GPS velocity information to calibrate said orthogonal axes accelerometer; anda zero motion detection system which provides a zero motion signal upon detecting a zero motion state to resolve ambiguity of low velocity GPS information.