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在可控震源资料处理中,选取扫描信号有三种情况:①处理时用的扫描信号和野外用的扫描信号完全一样,但起、止时间不一样;②扫描信号的起、止时间相同,但起、止频率不同;③野外用的是一个频繁变化的扫描信号,而处理时用的是一个不变的扫描信号。对于情况①要考虑两令扫描信号之间的时移产生的影响。对于情况②要考虑共同频段之间的时差;当频率变化1赫兹时,造成的时移为0.463秒。情况③是无规律可循的。由此可见,扫描信号在可控震源资料处理中的作用。每炮记录相关时必需选用本炮实际记录的扫描信号,绝对不能选用计算机产生的统一扫描信号。野外记录的扫描信号变化时,必须有详细记录。
In vibroseis data processing, there are three cases of selecting the scanning signal: ① The scanning signal used in processing is the same as the scanning signal used in the field, but the starting and ending times are different; ② The scanning signal has the same starting and ending time but Starting and stopping frequencies are different; ③ Field is a frequently used scanning signal, and the processing time is a constant scanning signal. For Case 1, consider the effect of the time shift between two scan signals. For Case 2, the time difference between common bands should be taken into consideration; when the frequency changes by 1 Hz, the time-shift caused is 0.463 seconds. Case ③ is irregular to follow. Thus, the role of the scan signal in vibroseis data processing. Each gun records related to the actual use of the gun must be selected when the scan signal, the computer can not choose a unified scan signal. Field records of the scanning signal changes, there must be detailed records.