ID	原文	译文
53997	然而，在弧形阵列SAR模式中，双基弧形阵列SAR天线特殊的圆弧型结构，回波信号的二维频谱难以用传统的驻定相位原理进行解析。	Due to the special arc antenna configuration of AA-BiSAR, it is difficult to have access to the two-dimensional frequency spectrum for AA-BiSAR via the principle of stationary phase(POSP).
53998	针对以上问题，本文引入隐函数的思想，	In view of the above problems, the method of implicit function is introduced into AA-BiSAR in this paper.
53999	将驻定相位点视为多普勒频率的一个隐函数，在对隐函数方程进行求导后运用代数运算求解出该驻相点，	The stationary phase can be considered as an implicit function of the Doppler frequency, and after deriving the implicit function equation, the stationary point can be solved by algebraic operation.
54000	从而可以直接利用驻定相位原理来推导出双基弧形阵列SAR的二维频谱，	On that account, the 2-D spectrum can be directly obtained by using the principle of stationary phase.
54001	并基于此频谱研究了一种适用于双基弧形阵列SAR的高分辨率成像处理方法，	On the basis of the previously obtained spectrum, an imaging algorithm based on the derived spectrum is developed for AA-BiSAR.
54002	最后点目标的仿真结果验证了结论的正确性与该成像方法的有效性。	The numerical simulation results of point target demonstrate the validity and effectiveness of the approach.
54003	针对阶数为3×2p的非标准调制与纠错编码难以匹配的问题，提出了一种面向6阶正交幅度调制(QAM)的双层编码调制传输方案。	Considering the problem of matching the non-standard modulation with the order of 3×2p and error correction code, a two-level coded modulation transmission scheme for 6-order quadrature amplitude modulation(QAM) is proposed.
54004	在发送端，采用有限域GF(2)低密度奇偶校验(LDPC)码与GF(3) LDPC码进行分层编码，并将两种编码码字映射为6进制码字后进行6-QAM调制;	At the transmitter, the Galois field GF(2) low-density parity-check(LDPC) code and GF(3) LDPC code were used for layered encoding, and the two kinds of LDPC codewords were mapped to senary codewords for 6-QAM modulation.
54005	在接收端，根据GF(2) LDPC码和GF(3) LDPC码的译码顺序，设计了两种双层迭代译码方法。	At the receiver, two-level iterative decoding methods were designed according to the decoding order of GF(3) LDPC code and GF(2) LDPC code.
54006	仿真结果表明，在加性高斯白噪声(AWGN)信道下，执行一次整体迭代译码时，先执行GF(3) LDPC码译码的6-QAM分层编码调制方案比先执行GF(2) LDPC码译码的方案获得了更优的误符号率(SER)性能;	Simulation results show that, under the additive white Gaussian noise(AWGN) channel, performing an overall iterative decoding, the coded modulation scheme for 6-QAM which performs GF(3) LDPC decoding first achieves better decoding performance than the scheme which performs GF(2) LDPC decoding first.