Processor for multiple, continuous, spread spectrum signals
First Claim
1. An apparatus for decoding N spread spectrum pseudo randomly coded signals in the form of a single composite CW signal to form a plurality of pulses each containing all the information in one of said N signal, comprising:
- means for adjusting the bandwidth of said composite signal to a predetermined bandwidth;
a tapped delay line for serially receiving said CW signal of said predetermined bandwidth;
means for storing a pseudo random reference code corresponding to a preselected code segment of one of said N spread spectrum signals;
comparison means for detecting correlation between said reference code and said one of said N signals;
means for generating a pulse containing all the information in a segment of one of said N signals, said segment corresponding to the total delay time of said tapped delay line, the position of said pulse indicative of the degree of synchronization between said reference code and said first signal; and
means for changing said reference code to one associated with another of said N signals;
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Abstract
This relates to a signal processor which accepts the linear sum of several continuous (CW) direct sequence, spread spectrum signals, and outputs a sequence of narrow pulses, each of which contains all the available energy of one of the input signals. The CW signals are applied to the input of a tapped delay line, the contents of which are compared, in a parallel fashion, with the output of a code storage register. When correlation has been achieved, a narrow pulse is produced which contains all the available energy of one of the input signals. The circuit reduces the problem of continuously processing several simultaneous signals, conventionally performed with dedicated circuitry for each signal, to a sequential pulse processing operation, effectively timesharing the same single set of circuitry. Both amplitude and phase information is preserved through the processing technique allowing implementation in coherent and non-coherent system architectures.
190 Citations
4 Claims
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1. An apparatus for decoding N spread spectrum pseudo randomly coded signals in the form of a single composite CW signal to form a plurality of pulses each containing all the information in one of said N signal, comprising:
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means for adjusting the bandwidth of said composite signal to a predetermined bandwidth; a tapped delay line for serially receiving said CW signal of said predetermined bandwidth; means for storing a pseudo random reference code corresponding to a preselected code segment of one of said N spread spectrum signals; comparison means for detecting correlation between said reference code and said one of said N signals; means for generating a pulse containing all the information in a segment of one of said N signals, said segment corresponding to the total delay time of said tapped delay line, the position of said pulse indicative of the degree of synchronization between said reference code and said first signal; and means for changing said reference code to one associated with another of said N signals; - View Dependent Claims (2, 3, 4)
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Specification