Abstract: A refrigeration unit is provided with a manually operated fresh air vent made up of a cap assembly and a handle assembly which move together in a linear/axial direction. The handle assembly is rotatable to change the position of the fresh air vent. The fresh air vent controls both the providing of fresh air to the circulating air in the trailer and the exhausting of a portion of the circulating air. The evaporator fan is run continuously when the air vent is open to prevent the build up of gases produced by the perishable cargo.

Abstract: A GPS receiver for integrating a GPS signal separately in a series of “A” type and “B” type time segments, the “A” segments alternating with the “B” time segments; combining the squares of the magnitudes of “A” time segment integrations corresponding to code phases for forming “A” type combined magnitudes; combining the squares of the magnitudes of the “B” time segment integrations corresponding to code phases for forming “B” type combined magnitudes; and determining an acquisition code phase of the signal from the strongest of the “A” or “B” combined magnitudes. The “A” time segments and the “B” time segments are one-half the period of the data bits of the signal, thereby ensuring that either the “A” time segments or the “B” time segments avoid the nullifying effect of data bit inversions.

Abstract: An indoor GPS clock using GPS signals lower that ?143 dBm for issuing disciplined frequency and time standard signals. The indoor GPS clock includes a correlation machine using long integration periods for enabling the indoor GPS clock to operate with low signal levels; a carrier-less tracking loop for tracking the low level signals without carrier offset feedback, a clock bias loop for providing clock bias feedback; and a reference oscillator using the clock bias feedback for providing disciplined frequency and time signals having greater accuracy than is available in conventional GPS positioning receivers. The indoor GPS clock also includes a holdover driver providing compensation for predicted drift in clock bias error for disciplining the reference oscillator for several hours when the GPS signal is no longer being received.

Abstract: An indoor GPS clock using GPS signals lower that −143 dBm for issuing disciplined frequency and time standard signals. The indoor GPS clock includes a correlation machine using long integration periods for enabling the indoor GPS clock to operate with low signal levels; a carrier-less tracking loop for tracking the low level signals without carrier offset feedback, a clock bias loop for providing clock bias feedback; and a reference oscillator using the clock bias feedback for providing disciplined frequency and time signals having greater accuracy than is available in conventional GPS positioning receivers. The indoor GPS clock also includes a holdover driver providing compensation for predicted drift in clock bias error for disciplining the reference oscillator for several hours when the GPS signal is no longer being received.

Abstract: A mobile temperature controlled container having an enclosed indoor section that closes against the one wall of the container. A blower wheel compartment is contained within the housing which has a spiral-shaped lower section that communicates with an upper discharge section. A blower wheel is mounted within the lower section of the compartment and the front of the enclosure is closed by a cover. The cover contains a circular inlet opening adjacent the blower wheel and a rectangular outlet nozzle located adjacent the discharge section of the compartment. The nozzle is arranged to discharge conditioned air into the container and has a vane thereon for optimizing the discharge flow into the container.

Abstract: A GPS receiver and method using alternating “A” and “B” integration time segments. The polarities of certain GPS data bits are known beforehand and their expected reception times are known. The GPS signal in 10 millisecond “A” time segments and “B” time segments is depolarized according to the known polarities. The depolarized GPS signal during an “A” time period made up of all the “A” time segments is integrated for providing an “A” time period magnitude for each code phase. Likewise, the depolarized GPS signal during a “B” time period made up of all the “B” time segments is integrated for providing a “B” time period magnitude for each potential GPS code phase. The strongest of the time period magnitudes is compared to a correlation threshold for selecting a code phase for signal acquisition.

Abstract: A mobile temperature controlled container having an enclosed indoor section that closes against the one wall of the container. A blower wheel compartment is contained within the housing which has a spiral-shaped lower section that communicates with an upper discharge section. A blower wheel is mounted within the lower section of the compartment and the front of the enclosure is closed by a cover. The cover contains a circular inlet opening adjacent the blower wheel and a rectangular outlet nozzle located adjacent the discharge section of the compartment. The nozzle is arranged to discharge conditioned air into the container and has a vane thereon for optimizing the discharge flow into the container.

Abstract: A mobile temperature controlled container having an air conditioning unit that has an indoor section and an outdoor section. The indoor section includes a housing having a rectangular shaped frame, the front face of which is secured to one wall of the container and a rear wall that is secured to the back of the frame. The rear wall is molded of a suitable plastic and contains a blower wheel compartment and a heat exchanger compartment containing a heat exchanger coil. Both compartments open into the frame and a generous flow path area is provided in the top section of the heat exchanger compartment over the coil so that return air from the container that is drawn into housing can move freely into the blower wheel compartment. The blower wheel compartment is enclosed by a cover having an air inlet opening adjacent the blower wheel and further includes a discharge nozzle that exhausts into the container.