Patent ID: 11956744
Assignee: CRYSTAL INSTRUMENTS CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A data acquisition unit for a distributed data acquisition system, the ground recording unit comprising:
a satellite radio beacon positioning system receiver, the receiver having a time register output supplying a current absolute time;
an analog-to-digital converter (ADC) that samples measurement data using a clock connected to an input of the ADC, the clock having a control input coupled to a time pulse output of the receiver for regular synchronization of a clock sampling rate;
a hardware logic circuit having a first input coupled to an output of the ADC to receive the measurement data, an initial start control output coupled to a control input of the ADC, and a measurement data output providing timestamped measurement data associating each sampled measurement data with a timestamp with a sub-microsecond accuracy relative to a corresponding absolute time established by the time register of the receiver;
wherein a remote host processor in communication to receive timestamped measurement data from the data acquisition unit is configured to compute a bias correction based on a comparison by the processor of a measured time from a timestamp of the measurement data with a corresponding nominal time based on a start time, nominal sampling rate of the clock, and number of samples, and applies the bias correction to the timestamped measurement data.