| 摘要: |
| 针对传统的天线组阵宽带信号合成性能评估方法存在因宽带、低信噪比（Signal-to-Noise Ratio，SNR场景下SNR估计算法精度受限致使信号合成性能评估精度低的问题，提出了一种采用功率计算的天线组阵宽带信号合成性能评估方法。该方法首先仿真多路中频信号，施加时间及相位延迟，模拟实际天线接收信号的时延和相位差，并对每路信号加噪，模拟低信噪比环境。然后，利用待评估的天线组阵算法对原始和延迟信号进行同步补偿直至收敛。最后，计算原始信号补偿后的合成功率，与理想信号合成功率作比，得到合成损失。针对该方法进行的仿真实验验证结果表明，在信号带宽250~500 MHz、信噪比-20~0 dB的条件下，该方法相较基于信噪比的宽带信号合成性能评估方法在评估准确性上约有1 dB的提升，在评估稳定性上约有0.1 dB2的提升，且提升效果随信号带宽的降低而更加显著。 |
| 关键词: 天线组阵 宽带信号 合成性能评估 信噪比估计 |
| DOI：10.20079/j.issn.1001-893x.240730001 |
|
| 基金项目:北京市科技重大专项（2181100002918004 |
|
| A Performance Evaluation Method for Wideband Signal Synthesis of Antenna Array |
| LI Xuejian,b,MA Hong,b,JIAO Yiwen,b,WU Tao |
| (a.Department of Electronic and Optical Engineering;b.Key Laboratory of Intelligent Space TT&C and Operation,Ministry of Education,Space Engineering University,Beijing 101416,China) |
| Abstract: |
| The traditional antenna array wideband signal synthesis performance evaluation method has the problem of low signal synthesis performance evaluation accuracy due to the limited accuracy of the signal-to-noise ratio(SNR estimation algorithm in the wideband and low SNR scenarios.For above problem,a wideband signal synthesis performance evaluation method of antenna array using power calculation is proposed.The method first simulates multiple intermediate frequency(IF signals,applies time and phase delays to simulate the time delay and phase difference of the actual antenna received signals,and adds noise to each signal to simulate a low SNR environment.Then,the original and delayed signals are synchronously compensated until convergence using the antenna grouping algorithm to be evaluated.Finally,the synthesized power of the original signal after compensation is calculated and compared with the synthesized power of the ideal signal to obtain the synthesis loss.Simulation experiments results show that under the conditions of signal bandwidth of 250~500 MHz and SNR of -20~0 dB,the method has an improvement of about 1 dB in evaluation accuracy and 0.1 dB2 in evaluation stability compared with the wideband signal synthesis performance evaluation method based on SNR,and the improvement effect is more significant with the decrease of signal bandwidth,and the improvement effect is more significant with the decrease of signal bandwidth. |
| Key words: antenna array wideband signal synthesis performance evaluation SNR estimation |
