摘要:
Synchronization for achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system whose radio receiver receives periodic transmissions, includes receiving periodic transmissions; turning on a radio receiver for a limited time to detect an expected message; if an expected message is not found, turning off the receiver and turning it on again after a time asynchronous with the transmission period; and after finding an expected message, waiting for the period of the transmissions less the length of an expected message and then looking for a synchronization symbol in the expected message and synchronizing subsequent actuation of the receiver using that synchronization symbol.
摘要:
Improved power management for a vehicle locating unit is achieved by receiving a transmission from a communication source, each transmission including at least one message frame having a data field and at least one auxiliary field; entering a wake mode upon indexing the assigned message frame of the receiver in the transmission; matching the pattern of bits of at least one auxiliary field of the indexed frame with one or more stored patterns of bits expected for that auxiliary field; and returning to the sleep mode as soon as a mismatch is determined or processing the message if no mismatch occurs.
摘要:
Improved power management for a vehicle locating unit is achieved by receiving a transmission from a communication source, each transmission including at least one message frame having a data field and at least one auxiliary field; entering a wake mode upon indexing the assigned message frame of the receiver in the transmission; matching the pattern of bits of at least one auxiliary field of the indexed frame with one or more stored patterns of bits expected for that auxiliary field; and returning to the sleep mode as soon as a mismatch is determined or processing the message if no mismatch occurs.
摘要:
A multi-spectral sensor assembly having a plurality of mosaics of four-side buttable focal plane arrays in which each mosaic array is responsive to a different range of the electromagnetic spectrum. The scene image is received through a baffled solar shade to a beam-splitting element which transmits a first portion of the received image in a first electromagnetic spectrum to a short wave infrared (SWIR) buttable focal plane array detector element. The beam-splitting element transmits a second portion of the received image in a second electromagnetic spectrum to a mid-wave infrared (MWIR) buttable focal plane array detector element by means of a folding mirror. The first and second portions of the received image are passed through a filter wheel having multiple selectable optical filters to provide a multi-spectral imaging system.
摘要:
A combined proximity monitoring and locating system including a wearable unit, a proximity detector, and a control subsystem. The proximity detector includes a receiver for receiving the wearable unit transmitter signal, a processing subsystem configured to signal an alert if the wearable unit transmitter signal strength is below a pre-established minimum, and a tracking subsystem configured to assist in locating the wearable unit based on the signal strength of the wearable unit transmitter signal. A control subsystem is responsive to an indication that the alert has been signaled. The control subsystem includes an RF transmitter configured to transmit a transponder activation signal, and an RF antenna network for relaying the transponder activation signal to a receiver of the portable unit to activate the transponder thereof. A tracking unit includes a receiver configured to receive the transponder signal of the wearable unit to locate the wearable unit.
摘要:
A combined proximity monitoring and locating system including a wearable unit, a proximity detector, and a control subsystem. The proximity detector includes a receiver for receiving the wearable unit transmitter signal, a processing subsystem configured to signal an alert if the wearable unit transmitter signal strength is below a pre-established minimum, and a tracking subsystem configured to assist in locating the wearable unit based on the signal strength of the wearable unit transmitter signal. A control subsystem is responsive to an indication that the alert has been signaled. The control subsystem includes an RF transmitter configured to transmit a transponder activation signal, and an RF antenna network for relaying the transponder activation signal to a receiver of the portable unit to activate the transponder thereof. A tracking unit includes a receiver configured to receive the transponder signal of the wearable unit to locate the wearable unit.
摘要:
A recovery system with repeating communication capabilities. The system includes a station configured to send an activation message, at least a first “primary” remote transmitting unit responsive to the station and configured to transmit the activation message and at least a one “secondary” remote transmitting unit. That unit includes a receiver which receives the activation message, a transmitter for transmitting the activation message, and a controller responsive to the receiver and controlling the transmitter. The controller is programmed to transmit the activation message and then automatically stop transmission of the activation message after a predetermined time period unless the activation message is again received.
摘要:
A recovery system and method with repeating communication functionality includes a station configured to send a first message and at least a first remote transmitting unit responsive to the central station and configured to transmit a second message to a locating unit. At least a second remote transmitting unit includes a receiver which receives the second message, a controller configured to process the second message, and a transmitter for transmitting a third message to the locating unit.
摘要:
A LIDAR system having a rotating geometric solid polyhedron reflective scanning and receiving element disposed on a rotation table element. The system is configured for scanning a transmitted electromagnetic beam such as a laser beam over a scene of interest in both elevation and azimuth and for receiving a reflected portion of the transmitted beam onto the focal plane detector array of the invention and to output an (x, y, range) set of point cloud coordinate image data.
摘要:
A sensor suite comprising a first electronic imaging element such as an LWIR imager element and a second imaging element such as a visible imager element. The transmitter operates with a plurality of selectable beam-forming optics or a tilt-tip element. The optics for the system may be configured in a Cassegrain-type configuration in cooperation with a plurality of beam-splitting elements to permit different ranges of the received optical input to be provided respectively to the first and second electronic imagers. One or a plurality of laser illuminator analysis spectrometers are provided for the detection and characterizing of incoming laser illumination from an external source which may be in the form of a micro-lamellar spectrometer element.