In this paper a near real-time (typically a baseline update once per hour, or once per day) continuous array system, with at least three dual-frequency GPS receivers connected to the IGS network, and many single frequency receivers, is proposed for monitoring applications covering a region of 50km radius. A weighted differential GPS method, appropriate for the suggested array design, can be imp...

This paper deals with the hardware implementation of base band (acquisition and tracking) modules of a GPS receiver using system generator 9.2 has been tried out. The implementation will be tested on Lyrtech (small form factor-software defined radio) platform which consists of 3 layers. The upper layer is the radio frequency (1 GHz) layer, middle layer is the ADACMasterIII layer and the last is...

This paper is concerned with frequency modulated (FM) interference cancelation in GPS receivers. FM signals are instantaneously narrowband and have clear time–frequency signatures that are distinct from the GPS C/A spreading codes. Interference cancelation is performed by first constructing the interference subspace and then projecting the data onto the orthogonal subspace. Interference subspac...

The atomic clocks orbiting around the earth in GPS satellites can be utilised by anyone to obtain accurate timing. All that is required is an inexpensive GPS receiver and a clear view of the sky. This has enabled a revolution in applications requiring synchronization such as cellular networks, telecommunications timing, digital TV and radio transmission, calibration laboratory systems and the i...

GPS telemetry markedly enhances the temporal and spatial resolution of animal location data, and recent advances in micro-GPS receivers permit their deployment on small mammals. One such technological advance, snapshot technology, allows for improved battery life by reducing the time to first fix via postponing recovery of satellite ephemeris (satellite location) data and processing of location...

New positioning applications’ availability requirements demand receivers with higher sensitivities and ability to process multiple GNSS signals. Possible applications include acquiring one signal per GNSS constellation in the same frequency band and combining them for increased sensitivity or predicting acquisition of other signals. Frequency domain processing can be used for this purpose, sinc...

GPS timing receivers have long been relied upon by various communications networks for achieving synchronization among the network nodes. Cellular networks, particularly CDMA cellular networks, actively employ GPS timing receivers for making their time critical decisions, particularly handoff. Operations and parameters which set the network quality of service (QoS) require that these GPS receiv...

CASSIOPE, the CAScade demonstrator Smallsat and IOnospheric Polar Explorer, is a Canadian satellite scheduled for launch in 2007. It is a hybrid mission designed for a wide range of tasks including space-based communication, high capacity information delivery, and observations of the Earth’s atmospheric environment. A dedicated suite of eight scientific instruments, called e-PoP, will investiga...

GAGAN is an Indian implementation of Satellite Based Augmentation System (SBAS), developed jointly by Airports Authority of India (AAI) and Indian Space Research Organisation (ISRO). It is in final operational phase with all the required ground and space segments ready. With the availability of GAGAN signal-in-space (SIS), the improvement in position solution is investigated using the two collo...