基于优化扩频发射信号超声多生命体定位方法
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摘要
震后超声多生命体定位系统受到噪声及串扰的影响导致错误的定位结果并降低系统的工作效率。为提高超声多生命体定位性能,提出了混沌编码和二值相移键控调制法构造超声传感器发射端的扩频发射信号,相关技术被用于接收端解扩。为获得最佳的相关效果,采用遗传算法优化Ulam-von Neumann变换混沌序列初值。在模拟震后环境中,优化扩频发射信号作用于超声多生命体定位系统进行了实验验证。实验结果表明,所提优化扩频发射信号可实现多个生命体同时定位,定位绝对误差在3.9cm以内。
Noise and crosstalk in post-earthquake multi-life location system can result in false location and decrease the work efficiency of system.To improve the performance of multi-life location system,the chaotic codes with Binary Phase Shift Keying(BPSK) method is proposed to construct the spread spectrum emission signals for ultrasonic sensors.Correlation technique in the receiving circuit is used to de-spread.To obtain the optimal correlation performance,the genetic algorithm is applied to optimize chaotic initial values of Ulam-von Neumann transformation.In simulated post-earthquake environment,experimental verification of ultrasonic multi-life location system with optimized spread spectrum emission signal is carried out.The experimental results demonstrate that the proposed method can realize multi-life location simultaneously with maximal 3.9 cm absolute error.
Noise and crosstalk in post-earthquake multi-life location system can result in false location and decrease the work efficiency of system.To improve the performance of multi-life location system,the chaotic codes with Binary Phase Shift Keying(BPSK) method is proposed to construct the spread spectrum emission signals for ultrasonic sensors.Correlation technique in the receiving circuit is used to de-spread.To obtain the optimal correlation performance,the genetic algorithm is applied to optimize chaotic initial values of Ulam-von Neumann transformation.In simulated post-earthquake environment,experimental verification of ultrasonic multi-life location system with optimized spread spectrum emission signal is carried out.The experimental results demonstrate that the proposed method can realize multi-life location simultaneously with maximal 3.9 cm absolute error.
引文
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[2]刘懿,郭勇,郑凯元,等.基于手机信号定位的地震灾害搜救系统研究[J].计算机工程与应用,2008,44(22):219-222.
[3]朱爱军,胡宾鑫,赵云,等.声光一体生命搜索与定位探测仪设计与实现[J].计算机工程与应用,2004,40(4):198-200.
[4]Hernández A,Urea J,García J,et al.Ultrasonic ranging sensor using simultaneous emissions from different transducers[J].IEEE Transactions on Ultrasonic,Ferroelectrics and Frequency Control,2004,51(12):1660-1670.
[5]Hernández A,Urea J,Mazo M,et al.Reduction of blind zone in ultrasonic transmitter/receiver transducers[J].Sensors and Actuators,2007,133(1):96-103.
[6]Marziani C,Urea J,Hernández A,et al.Modular architecture for efficient generation and correlation of complementary set of sequences[J].IEEE Transactions on Signal Processing,2007,55(5):2323-2337.
[7]Alvarez F,Urea J,Mazo M,et al.High reliability outdoor sonar prototype based on efficient signal coding[J].IEEE Transactions on Ultrasonics,Ferroelectrics,and Frequency Control,2006,53(10):1862-1871.
[8]陈玉桃,易波,许广廷.基于线性调频信号的多频测距算法[J].计算机工程,2007,33(16):226-228.
[9]孟庆浩,兰少莹,姚振静,等.基于混沌脉冲位置调制的实时超声测距系统串扰抑制[J].电子学报,2008,36(11):2268-2273.
[10]Meng Q,Lan S,Yao Z,et al.Real-time noncrosstalk sonar system by short optimized pulse position modulation sequences[J].IEEE Transactions on Instruments and Measurement,2009,58(10):3442-3449.
[11]Meng Q,Yao Z,Peng H.Improvement of energy efficiency via spectrum optimization of excitation sequence for multichannel simultaneously triggered airborne sonar system[J].Review of Scientific Instruments,2009,80(12).
[12]徐雯琪.生命搜索中超声探测的机理研究及超声探生仪的初步设计[D].成都:成都理工大学,2006.
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