Abstract: In a satellite navigation system a navigation terminal continuously receives navigation signals from navigation satellites and continuously implements navigation calculations, thereby obtaining navigation calculation results, and executes in parallel: using clock offset values determined through the navigation calculations, calculates, in real time, changes in difference between time differences with regard to difference between time differences, which are differences between a clock offset value and a standard deviation value, which is the value of the standard deviation of fluctuation amounts of the clock offset values; determines, in real time, two navigation precision indices of the calculated navigation calculation results on the basis of each change in the calculated difference between time differences and standard deviation value; associates, in real time, the determined two navigation precision indices with the calculated navigation calculation results; and outputs, in real time, the navigation calcul

Abstract: Provided is a positioning terminal of a global navigation satellite system configured to: receive a plurality of navigation signals and an augmentation signal from a plurality of navigation satellites and an augmentation satellite; acquire, in a process of causing each value of error causes including an ambiguity to converge through a plurality of times of observation to enhance an accuracy of positioning through continuous observation, each value of a position of the positioning terminal recorded in advance in a storage area to calculate each value of the error cause, and use the calculated each value as an initial value and/or one value to be added for the continuous observation to cause each value of the error cause to converge; and successively perform positioning calculation.

Abstract: In a satellite navigation system a navigation terminal continuously receives navigation signals from navigation satellites and continuously implements navigation calculations, thereby obtaining navigation calculation results, and executes in parallel: using clock offset values determined through the navigation calculations, calculates, in real time, changes in difference between time differences with regard to difference between time differences, which are differences between a clock offset value and a standard deviation value, which is the value of the standard deviation of fluctuation amounts of the clock offset values; determines, in real time, two navigation precision indices of the calculated navigation calculation results on the basis of each change in the calculated difference between time differences and standard deviation value; associates, in real time, the determined two navigation precision indices with the calculated navigation calculation results; and outputs, in real time, the navigation calcul

Abstract: Provided is a positioning terminal of a global navigation satellite system configured to: receive a plurality of navigation signals and an augmentation signal from a plurality of navigation satellites and an augmentation satellite; acquire, in a process of causing each value of error causes including an ambiguity to converge through a plurality of times of observation to enhance an accuracy of positioning through continuous observation, each value of a position of the positioning terminal recorded in advance in a storage area to calculate each value of the error cause, and use the calculated each value as an initial value and/or one value to be added for the continuous observation to cause each value of the error cause to converge; and successively perform positioning calculation.

Abstract: A system for transmitting and receiving an image signal has transmission apparatuses and reception apparatuses. Each of the transmission apparatuses includes an image pickup device for alternately outputting first and second image signals obtained by picking up images of a subject with different exposure times, a compressor for separately compressing data amounts of the first and second image signals, and a transmission interface for attaching an identification signal for identification of a transmitter and a frame number to each of compressed first and second image signals and transmitting attached compressed signals to a signal path. Each of the reception apparatuses includes a reception interface for receiving from the signal path the compressed image signals, an expander for individually expanding the received compressed image signals to reproduce the first and second image signals, and a combiner for combining reproduced first and second image signals at a desired combination ratio.

Abstract: A system for transmitting and receiving an image signal has transmission apparatuses and reception apparatuses. Each of the transmission apparatuses includes an image pickup device for alternately outputting first and second image signals obtained by picking up images of a subject with different exposure times, a compressor for separately compressing data amounts of the first and second image signals, and a transmission interface for attaching an identification signal for identification of a transmitter and a frame number to each of compressed first and second image signals and transmitting attached compressed signals to a signal path. Each of the reception apparatuses includes a reception interface for receiving from the signal path the compressed image signals, an expander for individually expanding the received compressed image signals to reproduce the first and second image signals, and a combiner for combining reproduced first and second image signals at a desired combination ratio.