CAJ | 학술논문

针对无源定位中的时差频差联合估计问题，利用内积公式推导出了基于互模糊函数的时差频差联合估计公式，并提出了相应的快速实现算法。其中通过适当变换互模糊函数计算公式，将传统的二维时差频差搜索算法变为对信号内积进行快速傅里叶变换，然后对变换后的数据进行二维搜索，大大提高了时差频差联合估计的速度，降低了运算量。通过重构离散傅里叶变换项，并进行近似，进一步降低了运算量。仿真结果说明，两种算法都能得出准确的结果，改进的算法计算时间更少。
침대무원정위중적시차빈차연합고계문제，이용내적공식추도출료기우호모호함수적시차빈차연합고계공식，병제출료상응적쾌속실현산법。기중통과괄당변환호모호함수계산공식，장전통적이유시차빈차수색산법변위대신호내적진행쾌속부리협변환，연후대변환후적수거진행이유수색，대대제고료시차빈차연합고계적속도，강저료운산량。통과중구리산부리협변환항，병진행근사，진일보강저료운산량。방진결과설명，량충산법도능득출준학적결과，개진적산법계산시간경소。
Deduce the cross ambiguity function using inner product. For the signal transmitted from the target is received by two different receivers, use cross ambiguity function to figure out the TDOA and FDOA between the two received signals. Transformed suitably, the cross ambiguity function formula can be counted as making a FFT to the inner production of the two signals, then find the max from the transformed data in two-dimensional search, which reduces calculation largely. Furthermore, simplify the Fourier transform term reduces calculation largely, meanwhile saves calculation time.