Method and apparatus for controlling a biphase modulation to imp

Details Method and apparatus for controlling a biphase modulation to imp Method and apparatus for controlling a biphase modulation to imp

1996-01-30

1997-07-08

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

For correlation

342145, 342194, 342203, G01S 728

Patent

active

056466277

ABSTRACT:
This invention relates to a method and apparatus for controlling a biphase modulator (602, 702) to improve autocorrelation in pseudorandom noise coded systems. The biphase modulator modulates a carrier frequency with one of two phase states responsive to a pseudorandom noise (PN) binary code sequence. The spectrum (610, 710) at the output of the biphase modulator comprises a plurality of spectral lines separated by the code repetition frequency, including a center spectral line (611, 711) and at least one adjacent spectral line (612-615, 712-717). The magnitude of the center spectral line is measured and compared to a reference to produce a control signal which is responsive to the magnitude of the center spectral line. This control signal is supplied to the biphase modulator for maintaining a predetermined magnitude of the center spectral line thereby achieving a desired spectrum output and improving autocorrelation of the system.

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patent: 5497160 (1996-03-01), Koehler et al.
patent: 5568150 (1996-10-01), Taylor, Jr. et al.

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