公开(公告)号：US3750167A

公开(公告)日：1973-07-31

申请号：US3750167D

申请日：1971-07-22

Applicant: GEN DYNAMICS CORP

Inventor： GEHMAN J ,  HERLICH G ,  MIKUTEIT S

IPC: B07C3/12 ,  B65G47/49 ,  G01S13/75 ,  G06K7/10 ,  G07B17/00 ,  G01S9/56

CPC classification number: G06K7/10346 ,  B07C3/12 ,  B65G47/49 ,  G01S13/753 ,  G01S13/758 ,  G06K7/10009 ,  G07B17/00508 ,  G07B2017/0004 ,  G07B2017/00629

Abstract: A system for tracking mail bags, letters, and parcels through a post office to determine mail processing times accurately as well as processing delays is disclosed. An unobtrusive transponder in the form of a card is located in letters or mail bags to be tracked. A number of stations are located along the route of the mail bags and irradiate these bags. Each station includes an array of three antennas disposed in mutually orthogonal relationship so as to irradiate the transponder notwithstanding its position. When irradiated by ultra high frequency (UHF) energy, the transponder is activated and transmits a VHF signal. The transponder includes a transmitting circuit which may be selectively set to transmit a signal having a frequency uniquely identifying the transponder. The system includes a receiver for tracking a plurality of transponders and providing an output as to when and if the transponder is tracked as it passes through each station along the mail route.

Abstract translation: 公开了一种通过邮局跟踪邮袋，信件和包裹以确定邮件处理时间以及处理延迟的系统。 卡片形式的不引人注目的转发器位于要跟踪的信件或邮袋中。 沿着邮袋的路线设有多个车站，照射这些行李。 每个站包括以相互正交关系设置的三个天线的阵列，以便尽管照射其应答器的位置来照射应答器。 当被超高频（UHF）能量照射时，应答器被激活并发射VHF信号。 应答器包括发射电路，其可以被选择性地设置为发送具有唯一地识别应答器的频率的信号。 该系统包括用于跟踪多个应答器的接收机，并且提供关于在通过沿着邮件路由通过每个站时跟踪应答器何时以及是否被跟踪的输出。