The Study, Based On The Tms320c6747 Onboard Gps Receiver

The gun is irreplaceable in the modern and future war, but its accuracy is always not high. In recent years, with the rapid development of Global Navigation Satellite System (GNSS), precise and all-weather navigation and global position can be achieved, which provides gun a new way of accurate technology. By far, Global Positioning System (GPS) is the most mature technology of the GNSS system. The second generation of our Beidou GNSS (BD-02), similar to the GPS, will operate in the near future. In order to accumulate technical experience of gun-borne BD-02 receiver, gun-borne GPS receiver is being researched for speeding up the application of BD-02 in the conventional weapons.However, there are several difficulties in the precise gun technology, such as overload, small-scale, low cost, shielding barrel and short flight time. So the gun-borne GPS receiver must have three properties: high overload resistance, small size and ability to quickly capture GPS signal. Therefore, based on those three properties, this thesis researched the gun-borne GPS receiver and good practical results were achieved. The main contents are summarized as follows.First, on resisting overload, in printed circuit board (PCB) design, a series of methods to enhance overload are adopted, which gun-borne GPS receiver used a foreign OEM receiver can not be achieved. Finally, encapsulation technology is taken to improve the performance of resisting overload. After 30,000g drop-hammer overload experiments, the results show that the receiver can work stably.Second, on signal reflection and crosstalk caused by small size of PCB, RF circuit and high-speed digital circuit design method is used effectively to ensure the signal integrity.Third, on ability to quickly capture GPS signal, ballistic solution is proposed in this thesis regarded as ancillary to GPS signal quickly capture algorithm. With this algorithm, the Doppler frequency shift between high-speed projectiles and GPS satellite stars visible can be quickly estimated and compensated. By new digital signal processor TMS320C6747, low-power, high performance and small package, the algorithm is programmed. Through the GPS satellite signal simulator tests, the results show that the algorithm can effectively reduce the signal acquisition time and successfully resolve the problem that the gun-borne GPS receiver needs to capture signal quickly...