Abstract: A laptop computer harness having a left shoulder strap for providing for the support in front of a standing user of a left side of a laptop computer. An upper part of a single belt is attached at a point near a left rear corner of the laptop computer, then passes over the left shoulder and then under the left arm of the user, and with an attachment to attach a lower part of the strap to a left front corner of the laptop computer. A right shoulder strap for providing for the support in front of the user of a right side of the laptop computer. An upper part of a single belt is attached at a point near a right rear corner of the laptop computer, then passes over the right shoulder and then under the right arm of the user, and with an attachment to attach a lower part of the strap to a right front corner of the laptop computer. A chest webbing for gathering the left shoulder strap to the right shoulder strap along a transverse line in front of the user's neck near the user's chest area.

Abstract: A GPS navigation receiver channel tracks satellites' Doppler frequencies sequentially during the twenty milliseconds that the signal is coherent in each bit time of the navigation data modulation. It measures frequency by differencing the angles of signal-vector sums weighted by parabolic humps, exploiting the commutativity of linear processing operations to raise the signal-to-noise ratio before the nonlinear operation phase of detection.

Abstract: A frequency synthesizer comprises a voltage controlled oscillator (VCO) with an output frequency f.sub.out that is dependent on a VCO-control voltage input. A divide-by-k counter is connected to receive the output frequency f.sub.out and to output a pair of in-phase and quadrature phase signals f.sub.k. A vector modulator is connected to receive the in-phase and quadrature phase signals f.sub.k and the output frequency f.sub.out, and outputs a single sideband (SSB) modulated output f.sub.n comprising only one of the sum (f.sub.out +f.sub.k) or difference (f.sub.out -f.sub.k) products. A divide-by-n counter is connected to receive the modulated output f.sub.n and to output a feedback frequency sample f.sub.f. And a phase detector is connected to receive the feedback frequency sample f.sub.f and to compare it with a reference frequency f.sub.r. A phase error output signal is provided for the VCO-control voltage input.