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Native positioning service

Last updated on December 7th, 2022

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If you still have questions or feedback about the technology, please contact us on our ticketing tool: Kinéis Customer Support. Our team will get back to you as soon as possible !

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The native positioning is an additional service on top of data uplink subscription, the data uplink service is thus required to activate the service. 

 

Service  Description Specifications Pricing
Native positioning 1 position every 4 received transmission, in average
  • Specific transmission strategy required (4msg per pass for optimal positioning)
  • Can be activated with short messages
+ 30% extra cost

 

Additionnal requirement

 A transmitter certification with good frequency stability is necessary to access this option.

 

 

Service Access Model

  • Complementary service: on top of Data uplink service. Messages received for data uplink service can be used to compute native location
  • Dedicated: Specific short messages. Native location is calculated with dedicated Low power short transmissions for longer autonomy
  • A combination of both types of messages​

 

Pricing

Prices are based on Data uplink service + 30% extra cost. Discount can apply based on commitment and volumes. 

 

 

 

Why use the native positioning?

 

  • No need for GNSS receiver and antenna integration for smaller and less expensive devices​
  • Power saving solution for device positioning ​since it can be computed using messages containing useful data and thus does not require additional emissions
  • 200m to 1km accuracy for static asset​
  • Insensitive to GNSS jamming
  • Unforgeable Doppler based location

 

More information about the quality of this service here: Native positioning service accuracy.

 

 

 

How does it work? The Doppler effect

 

When a device transmits signals to the Kinéis satellites, it is possible to compute a position using the Doppler effect.

 

The Doppler Effect is the change in frequency of an electromagnetic wave that occurs when the source and observer are moving relative to each other.

 

 

In this case, the satellite is passing above the Kinéis device, which is considered relatively still for the duration of the satellite pass (~10mn) in comparison to the satellite (passing at about 8km/s). The onboard instrument measures the received frequency of each message received over the satellite pass. Considering that the transmitted frequency is constant from the device, tracing the evolution of the received frequency over time gives the Doppler curve (exemple hereunder), from which the location of the device is computed by the Kinéis Service Center (c.f. image Native positioning step by step).

 

The location is attributed to the Device for a cluster of several messages. Each message is not localized individually.

 

Example of a Doppler curve

 

Native positioning has existed for 40 years! Argos has contributed to the knowledge of the migratory routes followed by animals thanks to the Doppler effect exploitation. 

 

 

Native positioning step by step

 

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