一种新的数字阵列雷达接收机技术

高速ADC和先进DSP器件的进展使数字波束形成智能天线的实现成为现实。在传统的M单元天线阵系统中，每一单元都有各自的接收通道和ADC，设备量大。文中提出了一种适合于多通道数字阵列雷达接收系统的新型数字接收机结构，其主要思想是基于多个不同信号的带通采样原理实现数字阵列雷达接收机，新接收机结构使IF接收通道和基带采样ADC显著减少，功耗大大降低。阐述了数字阵列接收的数据模型和工作原理，分析了多信号带通采样信号频率和采样率的关系，给出了采样率选取的约束条件。新接收机在降低设备量的同时，还减小了接收系统通道间幅一相不一致性失真。

A New Receiver for Digital Array Radar

The high speed analog to digital converters （ADC） and advanced digital signal processors （DSP） make the smart antenna with digital beamforming（DBF） to be practical. In conventional M-elements array antenna system, each element has its own receiving channel and ADCs. To reduce the hardware requirements for the DBF antenna array, a novel receiver for digital array radar is proposed. The essential idea is to realize the digital receiver based on bandpass sampling of multiple distinct IF signals. The receiver architecture is presented in detail and the simulation of bandpass sampling of multiple signals and digital down conversion to baseband is given. The principle analysis and simulation results indicated the effectiveness of the new proposed receiver.