The Design Of Multi-Mode Agile Signal Generator

With the continuous development of electronic warfare theory and perational platforms, anti-interference technology of wireless communication and radar has become the focus of attention of the electronic warfare. The wireless communication and radar system output signal bandwidth, stable, frequency switching time as well as many kinds of pattern signal production and agility output immediate influence antijamming effect. How to achieve multi-mode signal for the generation and agile output, to enhance anti-interference performance problems, this paper proposes a multi-mode agile signal generator design. This system uses in the wireless communication and the radar transmitting end produces the multi-mold signal and the random agility output, strengthened radar system's anti-interference effect.This article first unifies the direct digital frequency synthesis the principle of work, analysis the signal spectrum of ideally system, and the actual situation of the phase truncation, amplitude quantization, spurious noise caused by D/A non-ideal errors of characteristics then based on multi-mode agile signal system functional requirements, the various modules of the system design and implementation. In the design of hardware modules, mainly achieved signal control module, signal generation module circuit design, and in order to restrain the system signals stray noise and joined the high-frequency floating amplifier circuit, Also on the low-pass filter Circuit design and implementation of simulation and verification. In the design of software module, First realization of the system software design of the main control program functions while the system function control word and the working pattern, and achieve FPGA based on the QUARTUS II programming software environment under through the hardware description language to control AD9852 the software system design, then causes the LabVIEW superior machine software platform and the lower position machine through the serial port driver carries on the correspondence, has realized the man-machine interaction contact surface to the signal parameter establishment and the real-time monitoring. Makes the system to produce the frequency rang of 0~120MHz sine waveform,square waveform,triangle waveform,ASK waveform,FSK waveform,BPSK waveform, CHIRP waveform and so on many kinds of pattern waveform and the arbitrary agility output.Finally, the system debugging and results of analysis, experimental results show that the system can perform a variety of model, then the output signal of variable frequency signal output has high precision, high resolution, stability good points, to improve anti-interference, satisfy the system technology index and functional requirement.