Staccato pulse edge correlation
OwnerJames Lamanceinventor
Life of this patent
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Abstract
The present invention discloses a system and method for mitigating multipath in DSSS CDMA radio navigation signals by a) transmitting a rapid pulsing pattern from a transmitting device to a position receiver that samples the transmitted signal, b) separating the received samples and storing sample-based correlation accumulation values into independent bins that are synchronous with the received pulsing pattern, c) applying a logical decision process to determine the accumulation bin associated with the leading edges of the received pulses, and d) generating a range estimate from the correlation accumulation bin associated with the leading edges of the received pulses.
Claims20
A method of mitigating multipath in a radio navigation receiver, the method including the steps of:
- a) transmitting a rapid pulsing pattern from a transmitting device to a position receiver that samples the transmitted signal;
- b) separating the received samples and storing sample based correlation accumulation values into independent bins that are synchronous with the received pulse pattern;
- c) applying a decision process to determine the accumulation bin associated with the leading edges of the received pulses;
- and
- d) generating a range estimate from the correlation accumulation bin associated with the leading edges of the received pulses;
- such that the multipath of the range estimate is mitigated.
A system for transmitting and receiving a pulsed signal to mitigate multipath in a radio navigation receiver, the system comprising:
- a controller configured to generate a pulsed signal having sufficient quiet time between pulses so as to enable multipath signals to substantially dissipate prior to the beginning of subsequent pulses;
- and
- a transmitter configured to transmit the pulsed signal;
- a receiver configured to receive the pulsed signal, the pulsed signal having a plurality of pulses each of which has a leading edge;
- and
- a processor of the receiver configured to sample at the leading edges.
A method of mitigating multipath in a radio navigation receiver, the method including the steps of:
- a) transmitting a pulsed radio navigation signal from a transmitting device to a radio navigation receiver
- b) correlating on the leading edge of each pulse from said pulsed radio navigation signal by said radio navigation receiver
- c) generating a range estimate from said correlation.
A method mitigating multipath in a radio navigation receiver, the method comprising the steps of:
- a) receiving a pulsed CDMA radio navigation signal;
- b) correlating the pulsed CDMA radio navigation signal with internally generated pseudorandom code sequence in order to produce correlation values;
- c) generating range estimates from a subset of correlation values of the produced correlation values, the subset of correlation values being associated with leading edges of the pulsed CDMA radio navigation signal,
- such that the range estimates are generated from correlation values that are least multipath-affected.
Dependencies are inferred from the claim text.