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中文摘要：
阐述了直扩BPSK调制原理，给出了调制模型，论述了基于FPGA和直接数字频率合成技术的DS-BPSK调制器的设计与电路实现，根据伪码的产生原理，给出了在FPGA中实现平衡Gold码的方法及时序仿真；针对调制器的测试结果，提出了提高频谱纯度的高斯滤波器的优化设计方法，实现了对上行信号的DS-BPSK调制；通过无人机测控系统的搭载实验与应用证明：该调制器不仅实现了遥控数据的扩频功能，而且解决了无人机数据链中上行数据加密和抗干扰问题，扩大了无人机无线电的控制距离。
英文摘要：
In the article, the DS-BPSK modulation theory is introduced and the modulation model is analyzed. The designing and realizing of DS-BPSK modulator based on FPGA and direct digital frequency synthesis （DDFS, DDS） is elaborated. According to the rules of PN code, the realizing method of the balance Gold code in FPGA and the timing simulation are presented. Aiming at the modulator test results, an optimization design method of Gaussian filter has been proposed on improving the spectrum purity and the uplink signal DS--BPSK modulation is realized. According to the carrying experiments and applications of telemetry and teleeontrol systems of UAV （Unmanned Air Vehicle）, it is proved that the modulator is able to achieve telecontrol data spread spectrum, moreover the method may solve the uplink data eneryption and the anti-interference in UAV data link and UAV radio control distance is expanded.
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