流星余迹极低信噪比通信同步估计与信号补偿方法

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流星余迹极低信噪比通信同步估计与信号补偿方法

本发明公开了一种流星余迹极低信噪比通信同步估计与信号补偿方法，其目的是快速、准确的估计频率偏移并进行补偿，以提高极低信噪比环境中流星余迹通信系统的接收性能。该方法的具体实现步骤为：中频发送端首先采用多进制正交扩频系统对信号进行多进制扩频，然后调制并发送；中频接收端通过同步估计与信号补偿方法，对采用长扩频序列的接收信号进行载波频率偏移的估计，使频率偏移估计值尽可能的接近实际频率偏移，再通过对载波偏移的频率和相位补偿，使相关谱峰值至最大值，最后运用多进制判决得到恢复的原始信号。本发明可实现极低信噪比条件下流星余迹通信的可靠数据接收。

Meteorictrail extremely-low-signal-to-noise-ratio communication synchronous estimationand signal compensation method

Theinvention discloses a meteoric trail extremely-low-signal-to-noise-ratio communicationsynchronous estimation and signal compensation method aiming at quickly andaccurately estimating frequency deviation and conducting compensation so as toimprove the receiving performance of a meteoric trail communication system inan extremely-low-signal-to-noise-ratio environment. The meteoric trail extremely-low-signal-to-noise-ratiocommunication synchronous estimation and signal compensation method comprises theconcrete realizing steps that a medium frequency sending end conducts multi-aryfrequency spreading on signals by adopting a multi-ary orthogonal frequencyspreading system firstly, and then the signals are modulated and sent; and a mediumfrequency receiving end conducts carrier frequency deviation estimation on receivedsignals adopting a long frequency spreading sequence through the synchronousestimation and signal compensation method, so that a frequency deviationestimation value approximates to actual frequency deviation as far as possible,then a relevant spectrum peak value reaches the maximum value by compensating thecarrier deviation frequency and phase position, and finally, restored originalsignals are obtained by applying multi-ary judgment. The meteoric trail extremely-low-signal-to-noise-ratiocommunication synchronous estimation and signal compensation method can achievereliable data receiving of meteoric trail communication under the extremely-low-signal-to-noise-ratiocondition.