The paper proposes to estimate the spread spectrum sequence of the direct sequence spread spectral(DSSS) signals by chip-delay-multiply and correlation matrix Analysis.

Based on the typical characteristic that the signal transmitted in each hop by a correlated frequency hopping spread spectrum communication system is a frequency-fixed sine wave,the paper looks into the hop-duration based invariability of the correlated frequency hopping spread spectrum signals after delay multiplication low-pass processing.

The DS-SS/(Binary Phase Shift Keyed,BPSK) signal detection approach with delay multiplication multi-correlation is proposed in this paper.

This paper explains some problems encountered in the practical measurement using Virtual Instruments developed by LabVIEW,such as phase delay,noise,multitasking and ex-ecution,continuous analog output &input and so on.

The influence of carrier phase delay on demodulation output is corrected.

The simple method research for measuring the phase retardation of wave-plates;

Two-dimensional measurement for optical phase retardation;

Normal acceleration is provided by aerodynamic force,which is restricted by flight height and velocity;Orbit-pulse-control is very different in that it provides normal acceleration without delay,and response time is reduced by one order of magnitude;Attitude-pulse-control behaves 180o phase lag at natural frequency of the missile body,however,the phrase lag of o.