Radiolocation system having writing pen application

A method for tracking a wireless moving object, comprising:

• transmitting a plurality of RF bursts at a PRF from the moving object;
• providing a plurality of receivers at known relative positions;
• generating a plurality of gating pulses at the PRF and sweeping the occurrence time of the gating pulses relative to the RF bursts;
• receiving the RF bursts, at each of the receivers;
• and
• producing digital representations of the RF bursts in response to the gating pulses.

A method of digitizing handwriting written by a user using a wireless pen, comprising:

• transmitting, from the wireless pen, a plurality of RF bursts at a PRF;
• providing a plurality of receivers, each of the receivers having an antenna at a known position;
• generating a plurality of gating pulses at the PRF which are swept in time relative to the RF bursts, each of the gating pulses having a duration;
• receiving the RF bursts at each of the receivers within the durations of the gating pulses;
• producing digital representations of the RF bursts received by the receivers.

A radiolocation system for tracking a wireless moving object, comprising:

• a transmitter, integral with the moving object, for transmitting a plurality of RF bursts at a transmit PRF;
• a plurality of receivers, at known relative positions, for receiving the RF bursts upon receipt of gating pulses and outputting a digital representation of the received RF bursts;
• a receive PRF generator for receiving a digital representation from a receiver and for providing a PRF at the exact frequency of the transmit PRF;
• a timing sweep coupled to the receive PRF generator for sweeping the gating pulses over a range of delays relative to the transmitted RF bursts;
• and
• a gate generator coupled to the timing sweep for generating a plurality of gating pulses at the transmit PRF and swept in time relative to the transmit RF bursts, and for supplying the gating pulses substantially simultaneously to each of the receivers, each of the receivers then receiving the RF bursts for the duration of the gating pulses.

A method for tracking a wireless moving object, comprising:

• transmitting a plurality of RF bursts at a transmit PRF from the moving object;
• providing a plurality of receivers at known relative positions;
• locking a receive PRF generator to the exact frequency of the transmit PRF;
• generating a plurality of gating pulses having a duration at the transmit PRF;
• sweeping the occurrence time of the gating pulses relative to the RF bursts;
• receiving the RF bursts during the duration of the gating pulses at each of the receivers;
• producing digital representations of the RF bursts in response to the gating pulses.