Beidou Users From The Zero Value Of The Test Equipment Development

The main content of this thesis is developing the device,which will be used to measure the transmitting and processing time of "BeiDou" navigation receiver so that it can help to minish the position error. In this thesis we use the Spread-Spectrum system to do the job;First,a rf carrier signal modulated by pseudorandom noise code was transmitted , the signal passed through the measured system and received by the developed device. Comparing the phase of the PN code can get the delay time. The receiving part include mixer,local oscillator,lpf,AGC circuit,the theory of these circuit is introduced in the anterior chapter ;then in the following chapter the baseband circuit is introduced. The key technology of the device is the PN code acquisition.we chose digital matched filters to reality the PN code acquisition with 1bit quantization and 16 time sample per chip. At last,we achieved the goal while using the device to measure the delay time of the BeiDou" navigation receiver.