Study On Method And Technique Of Multipath Signal Modulation

To take advantage of telemetry technique , the paper has developed a modulator with good compatibility, versatility, low cost and convenience . The research includes : the preprocssing of sensor signal , the normalization and compression , signal transferences in the first and second phases , which ensured an in-depth study of circuit designing for the lowpass wave filter , the digital-analog converter , the voltage controlled oscillator under the comparatively ideal linearity . The specific route is as follows: firstly , the output signals from the multipath sensor are nornalized , i.e. , all sensor signals (including the analog data ) are transformed into multipath square wave pulse signals to form multipath parallel condition codes . These codes are treated as input signals for DAC to obtain a series of dispersed analog signals for output as input signals for the VCO . Finally , a high frequency modulation signal is conducted at the VCO's output.