公开(公告)号：US4112497A

公开(公告)日：1978-09-05

申请号：US782464

申请日：1977-03-29

申请人： James C. Administrator of the National Aeronautics and Space administration, with respect to an invention of Fletcher ,  James W. Layland ,  Warren L. Martin ,  Arthur I. Zygielbaum ,  Richard M. Goldstein ,  William P. Hubbard

发明人： James C. Administrator of the National Aeronautics and Space administration, with respect to an invention of Fletcher ,  James W. Layland ,  Warren L. Martin ,  Arthur I. Zygielbaum ,  Richard M. Goldstein ,  William P. Hubbard

IPC分类号： G06F17/15 ,  G06F15/34 ,  G01S9/38

CPC分类号： G06F17/15

摘要： Apparatus for demodulation and correlation of a code modulated 10 MHz signal is comprised of a sample and hold analog-to-digital (A/D) converter synchronized by a frequency coherent 40 MHz pulse to obtain four evenly spaced samples A1,B1,A2 and B2 of each cycle of the signal, and means for adding, or subtracting, each sample to, or from, one of four accumulators to form the sums: ##EQU1## where M1 = 10 MHz Reference .multidot. Receiver Code .angle.0.degree.M2 = 10 mhz Reference .multidot. Receiver Code .angle.90.degree.The correlation functions that are used for the range measurements are then computed from the following equations:I = S1.sub.I cos .alpha. - S2.sub.I sin .alpha.Q = S1.sub.Q cos .alpha. - S2.sub.Q sin .alpha.where sin .alpha. and cos .alpha. are determined at the start of each range acquisition by forcing the receiver code for both M1 and M2 to be equal to 1 and applying these equations: ##EQU2##

摘要翻译： 用于码调制的10MHz信号的解调和相关的装置由通过频率相干40MHz脉冲同步的采样和保持模数（A / D）转换器组成，以获得四个均匀间隔的采样A1，B1，A2和 B2，以及用于将四个累加器中的每个采样的每个采样相加或减去的装置，以形成总和：其中M1 = 10MHz参考x接收码ANGLE 0 DEG M2 = 10 MHz参考值x接收机编号角度90°用于范围测量的相关函数由以下公式计算：