Earth/Horizon Sensors

11 Earth/Horizon Sensors for Space Applications from 8 manufacturers listed on SatNow

Earth/Horizon Sensors for space applications from multiple manufacturers are listed on SATNow. Use the filters to select products based on your requirement. View product details, download datasheets, compare products, get quotes and pricing for matching products. SATNow has compiled this list of products specifically for Space and Satellite Applications.

Description:Earth sensor assembly for measuring radiation
Mass:
1.95 kg
Accuracy:
±0.03 Degree
Supply Voltage:
31 to 50 V
Power Consumption:
4 W
Space Heritage:
Yes
more info
Description:Digital Earth Sensor with Thermal Infrared Micro Camera
Satellite Type:
SmallSat
Mass:
0.4 g
Accuracy:
1 Degree
Field of View:
37 x 44 Degree
Data Acquisition Rate:
8 Hz
Supply Voltage:
15 to 50 V
Power Consumption:
2 W
Interface:
CAN, RS-422
more info
Description:The unit measures relative radiant intensity in the CO2 (15u) frequency band
Mass:
0.35 g
Accuracy:
0.2 Degree
Field of View:
±5 Degree
Data Acquisition Rate:
20 Hz
Vibration:
25 g RMS
Supply Voltage:
±12 V
Power Consumption:
1 W
more info
Description:Single earth sensor with integrated electronics
Mass:
0.03 kg
Accuracy:
0.2 Degree (1-sigma)
Field of View:
180 Degree
Vibration:
14 g RMS
Radiation Tolerance:
24 krad
Supply Voltage:
3 V
Power Consumption:
0.1 W
Space Heritage:
Yes
Interface:
I2C, UART
more info
Description:Two axis infrared Earth horizon sensor
Mass:
2.5 kg
Accuracy:
0.05 Degree random error (3s), 0.02 Degree Bias Er...
Vibration:
26 g RMS, 20 g (PeaK)
Supply Voltage:
24 to 50 V
Power Consumption:
4 W
Space Heritage:
Yes
more info
Description:Dual conical scanning Earth Sensor
Mass:
3.4 kg
Accuracy:
0.035 Degree (Bias)
Data Acquisition Rate:
1.25 Hz
Vibration:
16.9 g RMS (Z axis), 13.2 g RMS ( X, Y axis)
Supply Voltage:
20 to 55 V
Power Consumption:
6.5 W
Space Heritage:
Yes
more info
Description:Earth sensor with four thermopile-optical assemblies
Satellite Type:
MicroSat
Mass:
0.1 kg
Supply Voltage:
5 V
Power Consumption:
0.05 W
more info
Description:Earth sensor for measuring infrared radiation from Space and from Earth with 4 IR-eyes
Satellite Type:
NanoSat, MicroSat
Mass:
0.12 kg
Accuracy:
1 Degree, (3-sigma)
Field of View:
±2.5 Degree
Data Acquisition Rate:
10 Hz
Radiation Tolerance:
30 krad
Supply Voltage:
5 V
Space Heritage:
Yes
Interface:
UART, I2C
more info
Description:The use of two pairs of 16 element pyroelectric detectors, the horizon Each 16 element
Mass:
1.5 kg
Accuracy:
0.04 Degree
Field of View:
±5 Degree
Vibration:
28 g RMS
Supply Voltage:
28 V
Power Consumption:
0.8 W
Space Heritage:
Yes
Interface:
RS-422
more info
Description:Dual conical scanning Earth Sensor for harsh environmental conditions
Mass:
3.5 kg
Accuracy:
0.06 Degree (Bias)
Data Acquisition Rate:
1 Hz
Vibration:
14 g RMS (Z axis), 12.2 g RMS ( X, Y axis)
Supply Voltage:
20 to 52 V
Power Consumption:
7.5 W
Space Heritage:
Yes
more info

What are Earth/Horizon Sensors

Earth/Horizon Sensor is used to observe the earth and collect the data to determine the nadir vector relative to the sensor. The nadir vector is the vector that points directly below a particular location, that is, it is one of the two vertical directions or it points in the direction of the force of gravity at that location. It is also commonly used as a reference vector in autonomous navigation, especially in the satellites' orbit determination. 


The calculated nadir vector is passed to the spacecraft. The spacecraft then uses this information to determine its orientation and make necessary attitude adjustments.

Earth Horizon Sensors can further be classified as follows:

  • Static Earth Horizon Sensor – It contains several sensors and senses infrared radiation from the Earth’s surface with a field of view slightly larger than the Earth with its use being restricted to spacecraft with circular orbits.
  • Scanning Earth Horizon Sensor – They primarily use a spinning mirror or prism that focuses a narrow beam of light onto a sensing element called the bolometer. The spinning of the mirror or prism causes the device to sweep out the areas of a cone and electronics inside the sensor which then detects when the infrared signal from Earth is first received and when it is lost. The time elapsed is used to determine Earth’s width. From this, the roll angle can also be determined.
  • GPS - This sensor uses one signal to determine many characteristics such as satellite identification, position, the duration of the propagated signal, and clock information. Using a constellation of GPS satellites, navigation, positioning, precise time, orbit, and attitude can be determined.

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Space Heritage

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