毫米波收发信道研制

Design of a Transmitter and Receiver of Ka Band

本文介绍了一种Ka波段收发信道,主要用于航天及航空领域,实现空间数据通信、高精度测量定位。采用模拟调制技术实现数字基带信号的QPSK调制,利用数字间接合成、锁相倍频技术实现Ka波段低相噪本振源,通过上变频产生Ka波段QPSK发射调制信号;采用超外差接收方式接收回波信号,利用多级AGC技术实现大动态范围接收线性度。通过CAD优化、电磁仿真和MCM技术进行结构和电路设计,实现了Ka波段收发信道。实测发射信号相位噪声:≤-95d Bc/Hz@10k Hz,群时延波动:≤2ns,接收动态:-95d Bm^-25d Bm,群时延波动:≤25ns。

This article introduces a kind of Ka-band transceiver receiving and transmitting channel mainly data communications and high-accuracy surveys and positions between satellites.It uses analog modulation technology to implement the digital-based signal’s QPSK modulation,it uses digital-indirect-synthesis and phase-locked frequency multiplication technologies to generate Ka-band sending signals by up-conversions from Ka-band low-phase noise sources; super heterodyne receiving modes to receive echo signals and multi-level AGC technologies are used to implement high dynamic range linearity.CAD optimizations,EML electromagnet simulations and MCM technologies are used to design structures and circuits realizing Ka-band transceiving channel.Actually measuring signal phase-noise is less than equal to≤-95 dBc/Hz@10 kHz,group delay fluctuation is ≤2 ns; receiving gain is 25 dB-95 dB,group delay fluctuation is ≤25 ns.