Generations of sequences of waveforms
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Accused Products
Abstract
A sequence of waveforms is generated by producing a primary symbol sequence and, for each symbol within the sequence, substituting a randomly-selected waveform. The primary symbol sequence has a narrow autocorrelation function, and may be a train of pulses, with the pulses arranged in packets of predetermined configuration. Objects can be detected by transmitting the waveforms, forming a representation of the transmitted waveform and delaying that representation, and correlating the representation with signals received as a result of reflection of the transmitted waveforms.
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Citations
35 Claims
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1-17. -17. (canceled)
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18. A method of generating a sequence of waveforms, wherein:
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the waveforms are generated at timings corresponding to pulses in a primary sequence having a narrow autocorrelation sequence, said pulses being arranged in packets of predetermined configuration with gaps between the packets, and the timings of the pulses within each packet being such that each packet has a narrow autocorrelation sequence;
and wherein each waveform is randomly selected from a set of waveforms with respective predetermined characteristics. - View Dependent Claims (19, 20, 21, 22, 23)
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- 24. A method of generating a sequence of waveforms, each waveform being generated at a liming corresponding to that of a respective symbol in a primary sequence having a narrow autocorrelation sequence, the primary symbol sequence including symbols of a plurality of types, wherein each waveform is randomly selected from one of a plurality of sets of waveforms having respective predetermined characteristics, the set from which the waveform is selected being dependent on the type of the respective symbol.
- 26. A method of generating a sequence of waveforms, the waveforms being generated at timings corresponding to symbols in a primary sequence having a narrow autocorrelation function, wherein each waveform is randomly selected from a set of waveforms with respective predetermined characteristics.
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30. Apparatus for generating a sequence of waveforms, the apparatus being arranged to operate in accordance with a method as claimed in 18.
Specification