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System Components
The Rosum TV-GPS and TV-GPS Plus location systems are made up of the following components:
- RTMM (positioning module contained in the positioning device)
- Location Server (deployed at service provider site)
- Monitor Unit (typically 3-4 per large metropolitan area)
- Communication channels (cellular SMS & packet data, Internet; proprietary radio for TV-GPS Plus)
- Pseudo-TV Transmitter (TV-GPS Plus applications only; typically 5-6 per deployment)
TV-GPS application components
Rosum TV Measurement Module (RTMM)
The Rosum RTMM is a chipset which can be integrated into the user device to be located or tracked. The RTMM contains a TV tuner module, a digital signal processing module, and other supporting glue logic and memory.
Rosum is building two versions of this chipset: one DSP-based, and one ASIC-based.
The RTMM receives aiding information from the Location Server and sends back to the Location Server pseudorange measurements for TV channels in the area.
The RTMM has been designed to process all standard analog and digital terrestrial broadcast television signals based on simply changing the internal description of the signal(s) to be processed.
The RTMM is common to both the TV-GPS and TV-GPS Plus systems.
Location Server
The Location Server receives monitor data from Monitor Units in the region, and forwards that information, in the form of aiding information, to RTMMs. The Location Server's primary role is to compute the location of each RTMM based on its pseudorange measurements. Once a position has been computed, that information is either sent back to the RTMM to be displayed on the user device or it is forwarded to a tracking application or service provider, as required by the specific application.
The Location Server may be hosted by Rosum, or it may be hosted by the service provider or by the end customer, depending on the customer's application and need.
Monitor Unit
The Monitor Unit is a small device that is deployed in a fixed location in the region in which RTMMs (and their host location devices) will be deployed. The role of the Monitor Unit is to use its highly sensitive antenna to monitor TV signals in the region, to analyze the stability and timing of these signals, and to report this information back to the Location Server.
The Monitor Unit function is incorporated into PTTs for TV-GPS Plus applications.
Communication Channels
Rosum uses the following channels for intra-system data communication:
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| Communication Link | System | Mechanism |
| Monitor-to-Location Server | All | Internet |
| Location Server-to-RTMM | TV-GPS | Any IP Communication |
| TV-GPS Plus | Any IP Communication |
Pseudo-TV Transmitter (PTT)
Pseudo-TV Transmitters are deployed locally to "light up" buildings or areas with TV signals that the RTMM can detect. The result of using higher-powered local TV signals is greatly increased accuracy. Rosum TV-GPS applications enjoy room-level accuracy, in-building, in the deployed area.
The system components for a typical TV-GPS Plus deployment are shown below.
TV-GPS System Components
PTTs broadcast on unused TV channels as permitted by our FCC licensing agreement.