PacComm offers complete GPS-based tracking systems, including both the hardware and software components of these systems for customer integration.
Typical uses are:
Object tracking.
Automatic Vehicle Location (AVL).
Theft prevention and recovery
Security
Cargo tracking.
Differential GPS Data Links.
Dedicated systems on VHF/UHF .
Integrated differential and tracking.
Remote control of surveying systems.
Many other uses.
PacComm manufactures a wide range of packet data modems, RF modems and conventional (non-packet) modems which are widely used in GPS systems. We supply modem equipment to several GPS receiver manufacturers.
PacComm GPS data systems are in daily use around the world in these applications. PacComm is the outstanding choice for low cost AVL systems and components. We are continuing to develop and customize systems to meet the demands of our customers in this burgeoning marketplace..
PacComm offers a variety of mapping software and modem/RF hardware options to suit the capabilities of existing equipment in your system.
These include several types of AVL modem,"smart" modems (packet controllers) and "dumb" modems straight through.
AVL modems incorporate a GPS receiver, packet modem and, if desired, radio transceiver in a single integrated package.
Packet modems, whether independent or part of an AVL modem, handle data addressing, generate and decode packets and handle the link protocol including managing packet collision avoidance and recovery and error correction.
Straight-through modems convert host data to radio data at the same serial rate. All network addressing, link control, and error handling are handled by higher level protocols/equipment.
(All models include an active magnetic mount GPS antenna)
1200/2400bps MSK.
4-38.4 Kbps GMSK.
AVLM with 2 or 5 watt data transceiver.
AVLM-H with 2 or 5 watt data transceiver.
Economy Wireless Modem 1200bps AFSK
Economy Wireless Modem 2400bps MSK
These are a series of "dumb" modems which can be attached directly to the TTL or RS-232 serial ports on a host device. However, the customer must provide their own error detecting and framing protocol to account for vagaries of the RF link. Where the cost of engineering overhead would be excessive to do this a "smart" packet modem should be used.
1200 Baud AFSK circuit board assembly for integration into customer equipment.
1200bps AFSK encased unit.
2400bps MSK encased unit.
Packet Modems
EWM-1200 1200bps AFSK
EWM-24M 1200/2400bps MSK
EWM-4800 4800bps DFM
EWM-9600 9600bps DFM
EWM-19200 19.2Kbps DFM
I-SPIRIT 9600/19200bps DFM
UP-1200 1200bps AFSK
UP-24M 1200/2400bps MSK
UP-4800 4800bps DFM
UP-9600 9600bps DFM
UP-19200 19,200bps DFM
PP-1200 1200bps AFSK
I-Pico 1200bps AFSK
Note: Physical size precludes higher data rate modems in these models.
Our 'dumb' modems may be successfully used for transfer of RTCM-104 differential data. They are especially appropriate when used on a radio channel dedicated to full time broadcast of RTCM.
Packet modems contain the link protocols necessary to ensure data is received reliably. When packet modems are used for collection of object location information, they may also be used to carry the differential correction data in the reverse direction.
1200Bd modems will successfully send RTCM SC-104 corrections at the rate of one correction every 2 seconds.
GPS Receiver Modules
PacComm can provide a number of models of GPS receiver modules for your own evaluation and integration. These may be from any of the major manufacturers such as: TRIMBLE, Garmin, Motorola, etc. As applications vary, so do the specification requirements of the receiver. Please consult PacComm for the most appropriate choice of receiver to suit your needs.
Radios
All data links require a radio. Some PacComm products incorporate a radio (AVLM/RF and RF series radio modems - see additional price lists). PacComm has dealership agreements with many of the major radio manufacturers.
Choice of radios for each application is determined by licensing, power & frequency limitations. Please contact PacComm to discuss the best radio for your systems needs. Trunked radios are also available.
Uses in surveying for PacComm packet modems include transmission of DGPS data, remote data gathering from survey grade GPS receiver systems, remote control of theodolites, etc.
Well suited to Trimble 4000 and Ashtech surveying systems.
Allows rapid correlation of data and GIS resources.
Remotely control next generation theodolites with extensive microprocessor control.
Transparent usage of TAIP protocols, etc.
Reduces workload on operators.
PacComm specializes in manufacturing units to meet your packaging, power, weight and performance requirements.
Custom design work may consist of entirely new development work undertaken to the customer's specifications or may involve modifications to existing PacComm designs to better fit customer requirements.
Custom integration entails the use of existing standard PacComm products, possible with other manufacturers finished or OEM units into a custom unit meeting the final specification.
PacComm will make all efforts to comply to the individual needs set forth in a written specification at or before the time of order placement.
PacComm will maintain confidentiality of the details of configuration of modules, interface connectors, etc. and details of the customer and their detailed application whether or not a non-disclosure agreement has been signed.
Where multiple customers request similar or identical custom configurations, PacComm reserves the right to simply state that such a configuration has been previously shipped to another existing customer and therefore represents a non-original concept.
Contact Paccomm for application specific mapping support.
Applications
Vehicle Dispatch
Emergency services tracking
Fleet vehicle tracking (taxis, limos., etc.)
Marine vessel tracking
Buoy tracking
High Altitude balloon tracking
Charter yacht fleets
Animal movements
Oil spill tracking
Aircraft management
Differential GPS systems
What is Pseudo-differential GPS?
PDGPS is sometimes referred to as "Inverted DGPS". PDGPS works on the principle that if the system base station is told it's exact location, then a high quality GPS receiver can be used to monitor the difference vector from that known point to the point which the GPS receiver says it is. This difference vector is then applied to each incoming report from vehicles.
The compromise is that the system assumes that the vehicles and the base see the same satellites and resolve position with the same degree of selective availability (S /A). The corrected position is accurate to better than 10m for >90% of the time. Careful monitoring algorithms can reject false or large vectors and time averaging can minimize errors.
Transition from PDGPS to true DGPS becomes economically viable at around 10 vehicles.
Scaling up radio data rates to accommodate increased through-put is retro-fittable in all PacComm packet controllers.
Some of Our GPS related Customers
Ashtech, NavSymm, Rockwell International, Trimble Navigation, Qualcomm, TransTrak, Challenger Surveys, KARA, InterFerometrics, Space Quest, General Railway Signal, Robson & Parsons Ltd.,InfoTrade, Holst-Webster, Oceantronics, Avionicare, Everett Avionics, Aqua-Tech, Ham Radio Outlet, Global Electronics, Coastal Systems Station, Data-Com, Greenfield Assoc., Geonav, Integrated Systems Research, KiloWatt, MITRE, MacCormack Inversiones, Stennis Space Center (NRL), Texas A & M, Custom Software, Scientech, Satelite C.A., UEL, Vinncler, Optimal Golf Solns., Agrelo, Orbital Sciences, Civil Air Patrol, U.S. Department of Defense, U.S. Coastguard, U.S. Army, U.S. Navy, U.S. Army Corps. of Engineers, Unitech, DeKalb Agra, Opalfire International, University of Berkeley, University of Princeton, Amatek Systems Corp.