Design Of Integrated Baseband Processing Equipment For Satellite

The integrated baseband processing equipment applied to TT&C based onsimulant hardware exist single function, poor scalability, parameter adjustmentdifficulties and other problems.With the ultra-large-scale programmable gate array(FPGA) and high-speed digital processor (DSP) applications in the TT&C equipment,making equipments with IF70M below digital, synthesis,integration is possible. Theintroduction of software radio thought make the TT&C equipment enter into a newdevelopment period, the hardware greatly simplify, functional parameters can beconfigured by software flexibly. The paper aims at various deficiencies of theintegrated baseband processing equipment, explore to develop the functional parameterscan be configured, highly integrated baseband processing equipment.The paper refer software radio thought to establish a common hardware platformbased on FPGA, The modulation and demodulation function of the integrated basebandprocessing equipment can be realized by loading the software. Sampling IF70Mdirectly by the band-pass filter,using FPGA complete all the digital processes. FFTfrequency analyzing method can realize the pseudo-code capture, resolve thepseudo-code capture problem under big dynamic conditions, complete carrier doppleraccurate estimate synchronously. using digital orthogonal up-frequency conversionachieve70MHz modulation, can realize diversified methods,make the equipmentflexible. realize Doppler frequency of spread signal simulation by scanning pseudo-codeand carrier jointly.Though practical test, the integrated baseband processor device can perform avariety of code rate of the intermediate frequency signal modulation and demodulationtasks in a larger Doppler case, the software is set by the PC. the error rate very low,showing good performance under certain signal to noise ratio conditions.