Pseudo-random coder with improved near range rejection

Details Pseudo-random coder with improved near range rejection Pseudo-random coder with improved near range rejection

1975-12-15

1977-05-10

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

331 78, G06F 102

Patent

active

040230260

ABSTRACT:
A modified maximal length PRC (pseudo-random code) sequence generator for use in autocorrelating systems such as CW, bi-phase modulated PRC radar systems. The code generator for the system is a modified version of a known shift register and feedback arrangement, which provides a wordlength of 2.sup.n - 1 as known in the prior art. Means are shown for adding a zero in the sequence of n-1 zeroes which always occur within the PRC word according to pseudo-noise theory. The result is an autocorrelation function having no residual value for several bits on either side of the correlation peak, thereby providing a theoretically infinite range discrimination in the near vicinity of a true range value.

REFERENCES:
patent: 3609327 (1971-09-01), Paine et al.
patent: 3614400 (1971-10-01), Farnett et al.
patent: 3700869 (1972-10-01), Low et al.
D. Lancaster, "Understanding Pseudo-Random Circuits," Radio-Electronics, Apr. 1975, pp. 42-43 & 48-49.

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