In application,t h e acquired target and background by a ATR system are always changed temporarily, causing the disaccord of the reference and acquired target and the degradation o f correlation SNR.

• 但在实际应用中，ATR系统所获取的外场的目标与背景总是处于随时间不断变化的条件下，与系统所存储的参考目标通常都不会一致，从而导致相关识别SNR劣化。