Generations of sequences of waveforms

一种波形、序列的技术，应用在生成波形序列领域，能够解决不能够增加峰值自相关值等问题
CN1816755AInactive Publication Date: 2006-08-09MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI ELECTRIC CORP
Publication Date
2006-08-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The signals within a packet of transient signals are generated at timings corresponding to a binary pulse sequence having an autocorrelation function which, for all non-zero shifts, has a value which is substantially smaller than the maximum value at zero shift. The times of occurrence of the signals within a packet are such that the minimum gap between adjacent pulses in the corresponding binary pulse sequence exceeds a predetermined value, whereby the autocorrelation function of the binary pulse sequence exhibits a zero value for consecutive relative shifts which do not exceed a predetermined limit. Each transient signal may be a randomly-selected waveform with predetermined characteristics. At least one packet may be based on a composite sequence including a first binary pulse sequence interleaved with a second binary pulse sequence which is a time-reversed replica of the first binary pulse sequence, at least a substantial number of the transient signals corresponding to each binary pulse sequence being distinguishable from those corresponding to the other binary pulse sequence.
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Description

field of invention

[0001] The present invention relates to a method and apparatus for generating a sequence of waveforms, for example in an obstacle detection system, especially but not limited to blind spots or pre-crash ) used in the alarm system. Background of the invention

[0002] An important type of automotive blind spot or pre-collision warning system uses short bursts of electromagnetic or ultrasonic energy to interrogate a detection zone. Decisions about the presence or absence of obstacles within a predetermined range are then made by appropriately processing the energy backscattered by different objects within the field of view of the system. The detection device is arranged to detect whether the reflected pulse occurs within a certain delay (corresponding to a predetermined range) after the interrogation pulse has been transmitted. Instead of merely detecting the presence of reflected pulses, the analog value of the signal received after each pulse transmissio...

Claims

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