The North Seeking System Based On DSP

Platform system, as an independent and highly precise navigation equipment, has been widely used in kinds of ships and submarines. However, seeking north in this way takes too much time because its principle is the compass principle based on movable mount. This paper introduces an analytic method of quick north seeker , whose principle is to use gyro to sense the component value of the angle-rate of the earth rotation, with which the northern azimuth angle between the referenced shaft of carrier and actual north angle can be measured. With this method, ships can only spend few minutes in seeking north in the static state.The north-seeking system equipped in chariots is the orientational instrument based on this elementary principle. This system applies two-position north-seeking scheme conbineed with highly stable and accurately directional machine, with which cancelled the constant drift of gyro concerning no g, namely got rid of the infection caused by value of drif accumulated. And the price, the volume and power consumption of this product was reduced at the same time with the application of DSP as CPU.TMS320VC5402, the DSP, as an special digital signal processor, has high operation speed and precision, and it make the operation of complicated mathematics in north-seeking system more easy with all these advantages. Using VC5402 as the core, CPLD as the main assistant element in charge of control , this project designed and debugged the hardware and software consisting of data collection, processing and output ,the communication. The result is good.