초록 ▼

Disclosed is an in-band, non-sampling, real time VHF radio relay or signal repeater for use in two-way, multi-hop remote sensor data links. Each signal repeater comprises a transceiver which includes interference cancellation circuits for preventing the high level signal produced by the radio repeat

Disclosed is an in-band, non-sampling, real time VHF radio relay or signal repeater for use in two-way, multi-hop remote sensor data links. Each signal repeater comprises a transceiver which includes interference cancellation circuits for preventing the high level signal produced by the radio repeater\s transmitter section from desensitizing the low noise RF amplifier circuitry incorporated in the front end of the radio repeater\s receiver section. Such apparatus is utilized to implement a remote sensor data collection network consisting of a plurality of subject radio repeaters and several sensors normally arranged in groups. The data which flows over the relay network can either originate at the sensors and flow to a read out station or it may originate at the read out station and flow to the sensors. Sensor originated information may be either digital or analog, or both, while read-out station originated information is digital only. The relay operates with either analog or digitally-modulated signals. When used with an omnidirectional antenna, it is not direction-preferential.

대표청구항 ▼

Radio apparatus for operating as a signal repeater for the relaying of information signals from one location to another over a network, comprising: co-located receiver and transmitter means coupled to a common antenna and being operable such that RF signals received by said receiver means are retran

Radio apparatus for operating as a signal repeater for the relaying of information signals from one location to another over a network, comprising: co-located receiver and transmitter means coupled to a common antenna and being operable such that RF signals received by said receiver means are retransmitted without substantial delay from said transmitter means and wherein said receiver means includes RF input amplifier means, and further includes a first adaptive interference signal cancellation means coupled between said common antenna and said RF input amplifier means for preventing RF signals being currently retransmitted from rendering said receiver means unresponsive to concurrently received RF signals, and further including a second adaptive interference signal cancellation means coupled to the output of said RF input amplifier means to cancel any residue of interference signals not cancelled by said first adaptive interference signal cancellation means, whereby said receiver and transmitter means may be simultaneously operated without signal interference between one another thereby permitting near continuous use of both said receiver and transmitter means at a substantially 100% duty cycle.