星载多波束发射阵列天线多通道数字上变频设计

针对多波束发射阵列天线输入为中频宽带信号的特点,设计了数字波束成形网络方案,提出了一种适合于工程实施的多通道数字上变频并行处理算法,同时设计了一个集混频滤波和预加重处理功能于一体的复合滤波器,并结合反馈式增强锁相环和逻辑锁定技术提高了阵列天线各通道的幅相一致性.通过仿真分析和工程试验表明,提出的算法利用多相滤波器结构、分布式算法和复用式设计既减少了运算量,又有放降低了硬件资源消耗;采用的复合滤波技术及时钟同步技术提高了通道的幅相一致性,确保了相控阵天线波束赋形的效果.该设计的算法和硬件实施技巧对资源有限的大规模阵列信号处理有较好的借鉴价值,对宽带数字收发信机信号流设计也有一定的参考意义.

The Design and Implementation of Muti-channels Digital-up-converters of Multi-beam Phased Array Antenna on Satellite

A type of algorithm fit for the project implementation of 61 channels signals' digital-up-converter process (medium frequency) was proposed in the paper, based on character of the input signal of multi - beam phased army antenna. The algorithm aimed at saving multiplier resource and reducing calculation by means of polyphase filter, distributed arithmetic and multiplex pro-cess. A composite filter eomposed of pre-emphasis and mixer filter was designed to achieve the goal of consistent RF channel's amplitude to frequency response. The fixed-point algorithm was simulated via MATLAB and implemented on the hardware platform at the speed of 160MSPS. The technique of enhanced feedback PLL and logic lock was "adopted to realize, the minimum of clock skew and coherence of 61 channels' delay, which can improve the performance of beam foaming. The algorithm and hardware technique can be applied on the occasion of large scale array signal process with limited resource.