angel echo

angel echo

[′ān·jəl ‚ek·ō]
(engineering)
A radar echo from a region where there are no visible targets; may be caused by insects, birds, or refractive index variations in the atmosphere.
References in periodicals archive ?
Advertisements in the windows of letting agents featuring the Deposit Angel echo the information made available through student organisations, tenants' rights groups, legal centres and consumer groups.