Description

The Mini-RX Beacon can be used in both the Non-Inverse Architecture (NIA) and the Inverse Architecture (IA):

The is a 915MHz version only (for the moment).

All Mini-RX beacons have 6D IMU (3D gyro + 3D accelerometer) onboard.

The Mini-RX beacon differs from regular Beacon HW v4.9 in several ways:

  • The Mini-RX is an RX-only beacon, i.e. it can receive, but it cannot transmit ultrasonic signal
  • The fact that it is RX-only makes it far more sensitive, i.e. you will get a longer range between Beacon HW v4.9 and the Mini-RX than between Beacon HW v4.9 and Beacon HW v4.9
  • The Mini-RX beacon can receive any ultrasonic frequency from the bands: 19kHz, 25kHz, 31kHz, 37kHz, 45kHz, 56kHz. The filter can be simply selected in the Dashboard. At the same time, the ultrasonic frequency of Beacon HW v4.9 is HW-defined by ultrasonic sensors and can’t be changed
  • The Mini-RX beacon can receive several ultrasonic frequencies at once. That is used in Inverse Architecture. See the comparison
  • The Mini-RX Beacon is significantly smaller, than Beacon HW v4.9 in volume and weight. See the Beacons Comparison table
  • The Mini-RX Beacon can work with regular Beacons HW v4.9 in any combination as a part of a Starter Set or as a part of navigation systems and it is a superior RX-only replacement to HW v4.9. At the same time, since it is RX-only beacon, the Beacons HW v4.9 are here to stay as universal dual-use beacons. In all cases, beacons shall use the same radio band

Distance between beacons

  • Reaches up to 50 meters in lab conditions – signal strength limited. Practical limitation is 25m now – memory limited and may be fixed in upcoming SW releases
  • Recommended distance is up to 30 meters (Transducer4 of Beacon HW v4.9 looking straight at Beacon DSP HW v5.xx) – signal strength limited. But see the memory limitation above
  • Range of stable tracking of DSP beacon + Beacon HW v4.9 is 20-50% bigger, than the range of Beacon HW v4.9 + Beacon HW v4.9 in the same conditions

Coverage area

  • Reaches up to 1000 m2 with the Starter Set configurations
  • Coverage for larger territories is similar to cellular networks

Location precision

  • Absolute: 1–3% of the distance to the beacons
  • Differential precision: ±2 cm
  • Differential precision is on par or better than in the Beacon HW v4.9, partially, because the sensor is a point – not as spread sensors of HW v4.9; and, partially, because of higher processing power and more advanced algorithms of the DSP beacon

Location update rate

Non-Inverse Architecture:

  • 0.05–25Hz
  • Can be set manually or in automatic mode
  • Depends on the distance between the mobile and stationary beacons (shorter distance — higher update rate)
  • Depends on the number of mobile beacons: for example, update rate of 25Hz for 1 mobile beacon will result in update rate of 25Hz/2 for 2 mobile beacons, and 25Hz/3 – for 3 mobile beacons, etc. – TDMA approach
  • Depends on the radio interface profile (500kbps vs. 38kbps)

 

Inverse Architecture:

  • 0.05–25Hz. Future SW releases are planned to support IMU fusion that will  enabled update rate of up to 100Hz
  • Can be set manually or in automatic mode
  • Depends on the distance between the mobile and stationary beacons (shorter distance — higher update rate)
  • Doesn’t depend on the number of mobile beacons – all of them are receiving
  • Depends on the radio interface profile (500kbps vs. 38kbps)

Power supply and battery lifetime

Internal:

  • LiPol battery 750mAh
  • Battery lifetime totally depends on usage
  • Stationary beacon with 8Hz update rate => up to 30h
  • Stationary beacon with 1Hz update rate => 1 week
  • Future power saving features may increase battery life to 1year and more (with very slow update rate or location update on demand)

External:

  • microUSB – recommended for permanent use

Weight

  • 25g (board + battery + plastic housing)
  • 9g (board only)

Size

47x42x15mm

Description

The Mini-RX Beacon can be used in both the Non-Inverse Architecture (NIA) and the Inverse Architecture (IA):

The is a 915MHz version only (for the moment).

All Mini-RX beacons have 6D IMU (3D gyro + 3D accelerometer) onboard.

The Mini-RX beacon differs from regular Beacon HW v4.9 in several ways:

  • The Mini-RX is an RX-only beacon, i.e. it can receive, but it cannot transmit ultrasonic signal
  • The fact that it is RX-only makes it far more sensitive, i.e. you will get a longer range between Beacon HW v4.9 and the Mini-RX than between Beacon HW v4.9 and Beacon HW v4.9
  • The Mini-RX beacon can receive any ultrasonic frequency from the bands: 19kHz, 25kHz, 31kHz, 37kHz, 45kHz, 56kHz. The filter can be simply selected in the Dashboard. At the same time, the ultrasonic frequency of Beacon HW v4.9 is HW-defined by ultrasonic sensors and can’t be changed
  • The Mini-RX beacon can receive several ultrasonic frequencies at once. That is used in Inverse Architecture. See the comparison
  • The Mini-RX Beacon is significantly smaller, than Beacon HW v4.9 in volume and weight. See the Beacons Comparison table
  • The Mini-RX Beacon can work with regular Beacons HW v4.9 in any combination as a part of a Starter Set or as a part of navigation systems and it is a superior RX-only replacement to HW v4.9. At the same time, since it is RX-only beacon, the Beacons HW v4.9 are here to stay as universal dual-use beacons. In all cases, beacons shall use the same radio band

Additional information

Weight 0.025 kg
Dimensions 4.7 x 4.2 x 1.5 cm

Questions and Answers


Abraham Reichert
4 months 6 days ago

Hi
Dose it also can give except the XYZ position, also rotation data?

admin
4 months 5 days ago

It gives raw 3D gyro + 3D accel + 3D compass data.
Additionally, with IMU fusion enabled, quaternion is streamed out.
Even more, with Paired Beacon feature, you will have location + direction without any IMU drift: https://www.youtube.com/watch?v=aBWUALT3WTQ

Leandro Zimmer
21 days 2 hours ago

What’s the battery lifetime of Mobile Beacon Mini-RX at 1Hz in Inverse Architecture?
“Future power saving features may increase battery life to 1year and more”. Do you have more information about this feature?

admin
15 days 21 hours ago

We haven’t done yet detailed tests and focus in others things in SW development than power savings … There are really many parameters affecting the battery lifetime, most of all, size of the submap. Larger submap – shorter battery lifetime.

Now, we would suggest using these figures for the budgetary estimation:
Stationary beacon with 8Hz update rate => up to 30h
Stationary beacon with 1Hz update rate => 1 week