Research On Wireless Ranging Method Based On PN Sequence

The measuring of the distance is a basic data requirement in the production and in many areas of life. There are many kinds of measuring and mapping ways, from the original location means, to the mathematical means after the emergence of the science. But that the ranging technology has a substantial progress, which becomes further, faster and more precise, is just occurred in the20th century after the scientific breakthroughs. The new-type microwave spread spectrum ranging system, using the pseudo-random noise sequence as its signal, which is described in this thesis, is developed in recent decades. This system aside from the transmission range, strong penetrability of microwave technology characteristics, also has anti-noise, anti-multipath interference, and without specific band occupation and so on which is derived from the benefits of spread spectrum technology. The technology has a broad application in the air ranging and satellite positioning situation.This article introduces the basic theory of spread spectrum technology, the character and the generation of pseudo-random code signal. According to actual needs, the thesis identifies specific parameters of code system and select JPL rapid capture based on m-m composite sequences as ranging code signals of the system. A more optimized scheme of capture, constituted by the combination of parallel-serial scheme, based on digital matched filter acquisition scheme and Sliding correlation acquisition method, is also put forward after the analysis of modulation, tracking and capture of the PN-ranging code.A series of simulation waveform about the generation of m-sequence and m-m composite sequence, the digital matched filter, the slippage correlation capture and the parallel-serial combined capture are shown in the thesis. The simulation shows that the scheme can meet the needs of regenerative phase-modulation ranging system.