Abstract and motivation a theodolite is a prec...abstract and motivation a theodolite is a precision instrument used in surveying and engineering to measure horizontal and vertical angles. it consists of a telescope mounted on a base that can be rotated horizontally and vertically, and a set of graduated circles that allow the angles to be measured with great accuracy. the telescope is equipped with crosshairs that enable the observer to aim it at a particular point and determine its angle of elevation or depression relative to the horizontal plane. theodolites are commonly used in land surveying, construction, and mapping to establish points, lay out boundaries, and determine the heights and positions of objects or features on the earth’s surface. theodolite evolve to traditional total stations which is typically operated by a surveyor who manually aims and reads the instrument to obtain measurements. the traditional total stations also features an onboard computer that calculates the position of the target point relative to the instrument. to obtain measurements with a traditional total station, a surveyor first sets up the instrument on a tripod and levels it using a spirit level. they then aim the instrument at a target point and record the measured angles and distance. the surveyor can repeat this process for multiple points to create a detailed map or plan of the site. robot total stations (rts) are advanced surveying instruments, they are an evolution of traditional total stations, equipped with motorized components and a remote control system that allows them to be operated by a single person. the instrument can automatically track a prism, which is placed on a target point, and provide accurate measurements and data on a screen or a computer. robot total stations are faster and more efficient than traditional total stations because they rely on computer instead of a surveyor to physically move the instrument between measurement points. despite being advanced surveying instruments, robot total stations still have roots in the technology of theodolites. robot total stations maintain the essential two degrees of freedom serial mechanism found in theodolites, i.e. pan and tilt. in the mechanical community, it is well known serial mechanisms have some problems of low precision, high inertia and something else that is undesirable for robot total stations. to improve the mechanical part of robot total stations parallel mechanisms must to be used due to low inertia, high speed and frequency, and high precision. objectives this project aim to provide the novel insight on parallel mechanisms for robot total stations and laser trackers due its design requirements of high frequency, speed and precision. to achieve the general objective, the following specific goals and objectives were defined: 1. update the state of the art update on rts mechanism. 2. identify the geometric parameters and design requirements for rts. 3. propose new mechanisms form rts. 4. proposal of methods for analysis of rts. 5. publication of papers in international journals qualis a or b; 6. presentation of works related to rts in national and international conferences.