Abstract
火星离子与中性粒子分析仪共设计10种在轨探测模式,不同探测模式下数据率不同,多种探测模式下数据量远超出最大下行数据率的限制。为降低数据率,利用仪器内部FPGA有限的资源对压缩处理方法进行了详细设计。通过分析仪器数据特点,火星离子与中性粒子分析仪压缩算法采用合并处理、对数压缩和无损压缩三种压缩算法组合。对于每种探测模式,FPGA程序可根据压缩标志选择相应压缩算法,实现三种压缩算法串行使用,或选择其中一种或两种算法。并且压缩标志可通过注入指令改写,实现在轨时根据需求灵活配置。合并处理压缩比为2或4,对数压缩的压缩比为2,无损压缩效率与样本数据间的相关性有关。在此基础上,利用等离子体定标测试系统完成了地面测试。测试结果表明,各探测模式下科学数据经过压缩后数据率满足任务指标要求。
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