Precise Velocity Estimation with a Stand-Alone GPS Receiver
نویسندگان
چکیده
A scrutiny of the existing time differencing carrier phase (TDCP) velocity estimation algorithms has revealed several shortcomings which could be further improved. One of those is that the velocity estimation at epoch t would require the receiver positions at epoch t+Δt or more are available. Another one is the usage of satellite velocities in the calculations which would increase the receiver computational load and degrade the accuracy. In this paper, an improved TDCP velocity estimation approach has been proposed and tested. The new approach depends only on receiver position at epoch t and satellite positions at epoch t and t+Δt. Satellite velocities are not required in this calculation. This proposed algorithm has been validated using static and kinematic field test data, showing that equivalent velocity accuracy achievable by using differential GPS techniques can be made possible with the proposed standalone GPS method.
منابع مشابه
A GPS Velocity Sensor: How Accurate Can It Be? – A First Look
To obtain accurate velocity information, traditional optical velocity sensors and RTK-GPS positioning are common but expensive solutions. However, velocity information can be obtained from the time-differential method using a stand-alone single-frequency receiver without resolving carrier phase ambiguities. In dynamic vehicle testing, such a GPS sensor is attractive because it enables a single ...
متن کاملAccuracy Assessment of a High Sensitivity GPS Based Pedestrian Navigation System Aided by Low-Cost Sensors
Key words: pedestrian navigation, high sensitivity GPS Using long total dwell times, acquisition and weak GPS signal tracking in degraded signal environments are possible. A technology utilizing such long integration methods is called High Sensitivity GPS (HSGPS). A previous hardware in-the-loop GPS signal simulator test has demonstrated that, for a stand-alone HSGPS implementation provided by ...
متن کاملSmoother-Based GPS Signal Tracking in a Software Receiver
Global Positioning System (GPS) signal tracking algorithms have been developed using the concepts of Kalman filtering and smoothing. The goal is to improve phase estimation accuracy for non-real-time applications. A bit-grabber/software-receiver has been developed for the GPS L1 coarse/acquisition signal. The bit grabber down-converts, digitizes, and stores the raw RF signal. The software recei...
متن کاملA Single GPS Receiver as a Real-Time, Accurate Velocity and Acceleration Sensor
The determination of velocity and acceleration from GPS measurements is very important for many dynamic applications, but also for airborne gravimetry and geophysics, as long as we can achieve the specific accuracy and resolution for each application. The use of GPS receivers rather than speedometers and/or accelerometers, is a very attractive option, since they can be more cost-effective, easi...
متن کاملGPS Precise Point Positioning Using IGS Orbit Products
The International GPS Service (IGS) has provided GPS orbit products to the scientific community with increased precision and timeliness. Many users interested in geodetic positioning have adopted the IGS precise orbits to achieve centimeter level accuracy and ensure long-term reference frame stability. Currently, a differential positioning approach that requires the combination of observations ...
متن کامل