The Designation And Implementation Of The High-speed Multi-channel Digital Intermediate Frequency Receiver

The development of modern radar and communication technology, has brought a great challenge to electronic reconnaissance technology. As one of the key components of anti-radiation seeker, the stand or fall of receiver performance directly affects the reconnaissance and the interception performance of anti-radiation missile. The traditional analog receiver due to the low reliability, poor stability, and not flexible configuration has gradually can not adapt to an increasingly complex electromagnetic environment. And with the rapid development of microelectronics and digital signal processing technology, high sampling rate, large instantaneous dynamic range of ADC device and high performance of digital signal processing chip, for digital receiver based on software radio thought technology development has brought the good opportunity.Intermediate frequency digital receiver is mainly composed of the ADC conversion parts, data extraction, mixing and filter parts etc.In this paper, in accordance with the overall design scheme, aimed at intermediate frequency digital receiver data acquisition and processing are discussed, respectively through theoretical analysis and simulation verification and for hardware implementation.First of all, the working principle and classification based on software radio receiver were analyzed, and the seven channels of intermediate frequency digital receiver verifies the theory and design. Including bandpass sampling theory, the theory of orthogonal transformation and filter design principle, a detailed theoretical analysis and simulation verification. Secondly, the design of the system design scheme of the whole system, from the Angle of system hardware and software design of the whole system design. Including the system hardware circuit design, hardware module program configuration design, digital orthogonal transformation program design, high speed data interface design, design of digital receiver working mode and channel phase correction program design. Finally, to test the performance of the whole system, with the help of the FFT test method this paper analyzes the several main performance parameters of the high-speed ADC chip. Testing orthogonal mixing performance of the system, test analysis image rejection ratio after mixing within the passband filter. Performance testing phase correction between the channel effect, carries on the comparison to phase difference between before and after the correction,good phase consistency were obtained after correction. For resolution of four source Angle measuring results, finally achieved a good resolution Angle effect, the working performance of the whole system was verified.