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Two-cycle compensator for flux valve heading repeater system

  • US 3,938,257 A
  • Filed: 12/02/1974
  • Issued: 02/17/1976
  • Est. Priority Date: 12/02/1974
  • Status: Expired due to Term
First Claim
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1. In a magnetic compass data transmission system for navigable craft having generator means responsive to the earth'"'"'s magnetic field for generating first and second alternating output signals proportional to sin ψ

  • and cos ψ

    representative of said earth'"'"'s magnetic field direction ψ

    with respect to said craft and substantially independent of the magnitude thereof, said generator means inherently producing two-cycle data transmission errors in the presence of an element distorting the earth'"'"'s magnetic field in the vicinity of said generator means, the combination for correcting two cycle data transmission errors comprising;

    amplifier circuit means having first and second input means,first summation means for coupling said signals proportional to sin ψ and

    cos ψ

    from said generator means to said first input means,second summation means for coupling said signals proportional to sin ψ and

    cos ψ

    from said generator means to said second input means,variable impedance means coupled in parallel relation with said second input means for controlling the magnitude of the effective gain γ

    of said amplifier circuit means in proportion to said two cycle data transmission error thereby supplying at the output of said amplifier circuit means in cooperation with said first and second summation means a signal representative of (-γ

    (sinψ

    + cos ψ

    ), and third and fourth summation means responsive to said amplifier circuit means output for producing respective corrected data transmission signals proportional to sin ψ

    + γ

    (sin ψ

    + γ

    cos ψ

    ), and to cos ψ

    + γ

    (sin ψ

    + cos ψ

    ).

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