伪随机等效采样法在超宽带接收机中的应用

Application of Pseudorandom Equivalent Sampling in Ultra-wideband Receiver

超宽带接收系统的主要任务是将回波信号进行模数转换,供给后端平台处理。超宽带窄脉冲信号带宽一般从直流到GHz量级,且具有周期性,可采用等效时间采样对信号进行数模转换。顺序等效采样和随机等效采样硬件的实现都有一定的难度。伪随机等效采样克服了前两种等效采样方法的缺点,具有随机等效采样的数据不按照采样先后顺序排列的优点,同时采样时钟比顺序等效采样更容易获得,降低了对采样时钟的要求。

The main task of ultra-wideband （UWB） receiving system is to transmit radar echo signals to back-end processing platform after analog-to-digital conversion. The bandwidth of UWB narrow pulse is from direct-current to GHz and it is cyclical, so equivalenttime sampling can be used to handle digital-to-analog conversion. Both the hardware of sequence equivalent sampling and the hardware of random equivalent sampling are difficult to be implemented. Pseudorandom equivalent sampling overcomes the shortcoming of two equivalent sampling methods. It needs no permutation on sampling data like random equivalent sampling. It is easier to get sampiing clock in comparison with sequence equivalent sampling and it would reduce requirements for the sampling clock.