초록 ▼

A method for installation alignment of an inertial reference unit (IRU) with vehicle axes when the IRU is installed within the vehicle is provided. The vehicle axes include roll, pitch, and yaw axes. The method includes recording vehicle angular position data including roll and pitch, using an angul

A method for installation alignment of an inertial reference unit (IRU) with vehicle axes when the IRU is installed within the vehicle is provided. The vehicle axes include roll, pitch, and yaw axes. The method includes recording vehicle angular position data including roll and pitch, using an angular position measurement device with the vehicle being in a starting position, recording IRU data including roll and pitch, receiving measured nose plunge data, computing initial roll and pitch misalignment corrections, applying initial roll and pitch misalignment corrections to measured nose plunge data. A nose plunge yaw misalignment is determined using corrected nose plunge data and utilized to adjust the assumed heading reference.

대표청구항 ▼

A method for installation alignment of an inertial reference unit (IRU) with vehicle axes when the IRU is installed within the vehicle is provided. The vehicle axes include roll, pitch, and yaw axes. The method includes recording vehicle angular position data including roll and pitch, using an angul

A method for installation alignment of an inertial reference unit (IRU) with vehicle axes when the IRU is installed within the vehicle is provided. The vehicle axes include roll, pitch, and yaw axes. The method includes recording vehicle angular position data including roll and pitch, using an angular position measurement device with the vehicle being in a starting position, recording IRU data including roll and pitch, receiving measured nose plunge data, computing initial roll and pitch misalignment corrections, applying initial roll and pitch misalignment corrections to measured nose plunge data. A nose plunge yaw misalignment is determined using corrected nose plunge data and utilized to adjust the assumed heading reference. a second pulse signal of a second reference ON period, that is shorter in time than the first reference ON period of the first pulse signal, according to the heavy load state; an ON period comparison circuit comparing one of the first reference ON period and the second reference ON period with an ON period of the pulse signal to be used for performing the ON/OFF operation of the second switching element, and switching the output of the reference period generation circuit from the second pulse signal of the second reference ON period to the first pulse signal of the first reference ON period when the judgment result indicates the current state of the load is the light load state. 4. The switching power supply according to claim 3, wherein the ON period comparison circuit switches the output of the reference period generation circuit from the first pulse signal of the first reference ON period to the second pulse signal of the second reference ON period when the judgment result indicates the current state of the load is the heavy load state. 5. The switching power supply according to claim 4, wherein the load state judgment circuit determines that the current state is the light load state when a power consumption of the load is not more than a high frequency wave control target power. 6. The switching power supply according to claim 4, wherein the reference period generation circuit has a hysteresis characteristic in which the reference period generation circuit outputs the first pulse signal of the first reference ON period when the ON period of the third pulse signal to be used for switching the second switching element is shorter in time than the second reference ON period, and outputs the second pulse signal of the second reference ON period when the ON period or the pulse signal to be used for switching the second switching element is longer in time than the first reference ON period. 7. The switching power supply according to claim 3, wherein the PFC ON/OFF switching circuit stops the operation of the power factor improving converter during the light load state in order to reduce the magnitude of the current flowing through the power factor improving converter. 8. The switching power supply according to claim 3, wherein the reference period generation circuit has a hysteresis characteristic in which the reference period generation circuit outputs the first pulse signal of the first reference ON period when the ON period of the pulse signal to be used for switching the second switching element is shorter in time than the second reference ON period, and outputs the second pulse signal of the second reference ON period when the ON period of the pulse signal to be used for switching the second switching element is longer in time than the first reference ON period. 9. The switching power supply according to claim 1, wherein the control section controls that the ON period of the pulse signal to be used for switching the second switching element is decreased according to decreasing the load while keeping the output voltage of the switching power supply to a constant level. hrough a fourth winding of the plurality of windings. The third and fourth windings are arranged with opposite polarity. The output portion includes an output inductor connecting the virtual phase node to an output terminal providing an output voltage (VOUT). The controller is adapted to control operations of the first, second, third and fourth power switches such that the first and second power switches are enabled in respective alternating phases. The third switch is disabled when the second switch is enabled so that current flows concurrently through both the second and fourth windings to the output inductor during a first phase, and the fourth switch is disabled when the first switch is enabled so that current flows concurrently through the first and third windings to the output inductor.