Abstract: A device and method monitor integrity of a communication network. A local clock maintains a local time. A network interface receives time synchronization packets and associates with each the local time of receipt at the network interface. A processing system implements a neural network for classifying whether integrity of the communication network is compromised from originate, receive, and transmit values determined from the time synchronization packets. The originate value is a difference between the local time of the receipt of the request packet and a transmission timestamp of the request packet. The receive value is a difference between a reception timestamp of the request packet or the reply packet and the local time of the receipt of the request packet or the reply packet. The transmit value is a difference between the local time of the receipt of the reply packet and a transmission timestamp of the reply packet.

Abstract: A device and method monitor integrity of a communication network. A local clock maintains a local time. A network interface receives time synchronization packets and associates with each the local time of receipt at the network interface. A processing system implements a neural network for classifying whether integrity of the communication network is compromised from originate, receive, and transmit values determined from the time synchronization packets. The originate value is a difference between the local time of the receipt of the request packet and a transmission timestamp of the request packet. The receive value is a difference between a reception timestamp of the request packet or the reply packet and the local time of the receipt of the request packet or the reply packet. The transmit value is a difference between the local time of the receipt of the reply packet and a transmission timestamp of the reply packet.

Abstract: A method for estimating the position of a mobile station (MS) comprising the following steps: physically moving the MS at a constant velocity v in an environment comprising S stationary scatterers; wirelessly transmitting N uplink communication signals from a transmitter physically mounted to the MS; receiving each of the N uplink signals via D distinct paths at a fixed-location base station (BS); recording with the BS a time of arrival (TOA) ?, an angle-of-arrival (AOA) ?, and a Doppler-shifted frequency (DSF) of each received uplink signal; estimating the location of the MS using a least squares algorithm based on the TOA, the AOA, and the DSF.

Abstract: A method for estimating the position of a mobile station (MS) comprising the following steps: physically moving the MS at a constant velocity v in an environment comprising S stationary scatterers; wirelessly transmitting N uplink communication signals from a transmitter physically mounted to the MS; receiving each of the N uplink signals via D distinct paths at a fixed-location base station (BS); recording with the BS a time of arrival (TOA) ?, an angle-of-arrival (AOA) ?, and a Doppler-shifted frequency (DSF) of each received uplink signal; estimating the location of the MS using a least squares algorithm based on the TOA, the AOA, and the DSF.

Abstract: A GPS carrier-tracking method comprising: acquiring a GPS signal from a satellite with a receiver in acquisition mode when the signal strength of the GPS signal is equal to or above a carrier/noise (C/N0) threshold; tracking the carrier frequency of the GPS signal while the receiver in a tracking mode when the signal strength of the GPS signal is above the C/N0 threshold; recording carrier frequency values while the receiver is in tracking mode; predicting a current Doppler shift based on the recorded values when the signal strength of the GPS signal drops below the C/N0 threshold for a time period t; and resuming, without the receiver re-entering acquisition mode, tracking of the GPS signal after time t and once the signal strength of the GPS signal is again equal to or above the C/N0 threshold, wherein the resumed tracking is based on the predicted Doppler shift.