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本文介绍一种采用数字式频率合成和单边带混频技术的连续波多普勒模拟器。其载波为30兆赫,多普勒频率程控范围可达到±200千赫,量化间隔为1赫,频率稳定度为10~(-7),副波电平小于-40分贝。 由于计算机和数字技术在雷达中广泛应用,所以对雷达信号模拟提出了模拟参数应具有程控能力和高精度的要求。例如对目标速度的模拟要求多普勒频率程控和高频率稳定度等。常用的压控振荡器(VCO)由于频率稳定度低(10~(-4)左右),频率线性度差(3％～5％),所以不能实现精密频率程控。本文介绍的数字式多普勒模拟器能够满足这些要求。
This article describes a continuous wave Doppler simulator using digital frequency synthesis and single-sideband mixing. The carrier frequency is 30 MHz, the Doppler frequency range is ± 200 kHz, the quantization interval is 1 Hz, the frequency stability is 10 -7, and the level of sub-wave is less than -40 dB. As computer and digital technology are widely used in radar, the simulation parameters of radar signal simulation should have the requirements of program-controlled capability and high precision. For example, simulation of the target speed requires Doppler frequency programming and high frequency stability. Commonly used voltage-controlled oscillator (VCO) because of the low frequency stability (10 ~ (-4) or so), the frequency of linearity difference (3% ~ 5%), it can not achieve precision frequency programming. This article describes the digital Doppler simulator to meet these requirements.