Abstract: The optimal design of the SPS Receiver is disclosed. The optimal SPS Receiver includes the digital filter with adjustable characteristics in each digital processing channel. The optimal design of the SPS Receiver is achieved by adjusting the filter characteristics of each digital filter to match the observed spectrum of the unknown W code satellite signals. The matching operation can be performed for each satellite channel with its own secret W code signal.

Abstract: The system for the remote computer assisted precise pile driving and rig drilling operations is disclosed. The system includes a base station, a computer assisted precise pile driving and rig drilling (CAPPDARD) system, and a communication link. The CAPPDARD system includes a moving platform including a piling rig and a mast, a location determination means, a computer, and a communication means. The CAPPDARD system can be operated manually or remotely from the base station.

Abstract: The present invention relates to the new W code enhanced GPS receiver which allows to receive and demodulate the L1 and L2 satellite signals encrypted with the unknown Y code. No assumptions are made about the timing or the structure of the unknown Y code. The signal-to noise ration is not compromised in comparison with the reception of the L1 and L2 signals without code encryption.

Abstract: Apparatus and method for eliminating the time delay variation associated with the satellite signal propagating within an antenna for a GPS receiver (or GLONASS receiver). The antenna is an n-point symmetrical feed double-frequency feed antenna which has the reduced electrical center error ellipsoid as compared with the single point antenna. The angular dependence of the time delay variation on the azimuth and the angle of elevation of the incoming satellite signal is reduced in case of n-feed point symmetrical antenna. The GPS receiver with n-point antenna can be used for differential GPS, both static and dynamic, and for absolute GPS positioning.

Abstract: The GPS-map speed matching system for controlling the speed of the vehicle is described. The system includes a GPS navigation receiver, a database processing facility, a GPS computer, an engine computer, a video display, a speed sensor and a heading sensor. The database processing facility can be local or remote. The GPS computer obtains the latitude, longitude, heading and speed of the vehicle. The database processing facility processes the GPS data and obtains the location and the maximum posted speed of the vehicle. The GPS computer or an engine computer perform the comparison between the vehicle speed and the maximum posted speed and signal the odometer to decrease the vehicle speed if the vehicle speed exceeds the maximum posted speed plus some predetermined value.