首页>
外国专利>
Method and apparatus for improved autocorrelation in biphase modulated pseudorandom noise coded systems using tri-state demodulation
Method and apparatus for improved autocorrelation in biphase modulated pseudorandom noise coded systems using tri-state demodulation
展开▼
机译:利用三态解调在双相调制伪随机噪声编码系统中改善自相关的方法和装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
The present invention describes a method and apparatus for improving the autocorrelation performance in spread spectrum radar and communications systems by using a tri-state digital correlator to demodulate the received biphase modulated waveform. The tri-state correlator (100) includes a multiplexer (112) having a code input for receiving a tri-state code sequence, and three inputs each for receiving a sequence of data words including a first input for receiving a digitized signal data word, a second input for receiving an inverted digitized signal data word, and a third input for receiving a zero data word. The multiplexer includes an output and a means for producing a sequence of data words at the output, said means presenting at the output exactly one of the three data words appearing at either the first, second, or third input depending on which of the three code states appears at the code input. The present invention also describes the manner in which the tri-state code sequence is constructed from a binary code sequence to effect a significant improvement in the autocorrelation performance.
展开▼