By so doing, the biases in the modeled measurements that are common to both receivers, such as residual satellite clock error, are canceled or significantly reduced. It is a standard approach to collect measurements at a reference station and a target station and to form the double differences of the measurements between pairs of satellites and the pair of receivers. Take GPS carrier-phase measurements, for example. To extract the most useful amount of information from the measurements, the errors must be properly analyzed.Įrrors can be broadly grouped into two major categories: biases, which are systematic and which can be modeled in an equation describing the measurements, thereby removing or significantly reducing their effect and noise or random error, each value of which cannot be modeled but whose statistical properties can be used to optimize the analysis results. As I am fond of telling the students in my introduction to adjustment calculus course, there is no such thing as a perfect measurement. JACQUES-BÉNIGNE BOSSUET, the 17th century French bishop and pulpit orator, once said “Every error is truth abused.” He was referring to man’s foibles, of course, but this statement is much more general and equally well applies to measurements of all kinds.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |