Self-test method for a microwave module
AssigneeHoneywell International Inc.
InventorsTianfeng Zhao, Mingzhi Xzao, Lei Qin, Hansen Gu
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Abstract
A method and apparatus are provided for automatically testing microwave instruction detection modules of a security system. The method includes the steps of detecting intruders within a protected space by monitoring a Doppler output of a signal extraction circuit coupled to a microwave transceiver module, varying a frequency of direct current power pulses applied to the microwave transceiver module, detecting a difference in magnitude of the Doppler output of the signal extraction circuit over the varied frequency and comparing the detected difference with a fault threshold level.
Claims20
A method comprising:
- detecting intruders within a protected space by monitoring a Doppler output of a signal extraction circuit coupled to a microwave transceiver module;
- varying a frequency of direct current power pulses applied to the microwave transceiver module;
- detecting a difference in magnitude of the Doppler output of the signal extraction circuit over the varied frequency;
- and
- comparing the detected difference with a fault threshold level.
Apparatus comprising:
- a microwave transceiver module that detects intruders within a protected space;
- a signal extraction circuit coupled to an output of the microwave transceiver module that generates a Doppler output;
- a first programmed processor that varies a frequency of direct current power pulses applied to the microwave transceiver module;
- a second programmed processor that detects a difference in magnitude of the Doppler output of the signal extraction circuit over the varied frequency;
- and
- a third programmed processor that compares the detected difference with a fault threshold level.
Apparatus comprising:
- a microwave transceiver module of a security system that detects intruders within a protected space;
- a signal extraction circuit coupled to an output of the microwave transceiver module that couples a Doppler output from the microwave transceiver to an output connection of the signal extraction circuit;
- a first programmed processor that applies a sequence of direct current power pulses to the microwave transceiver module at a predetermined number of pulses per time period;
- a second programmed processor coupled to the output connection of the signal extraction circuit that detects a magnitude of the output;
- and
- a third programmed processor that compares an output of the signal extraction circuit with a fault threshold level.
Dependencies are inferred from the claim text.