Ainstein US-D1 User Manual

Radar altimeter

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2029 Becker Dr

Lawrence, KS 66047

Radar Altimeter

US-D1

User Manual

D00.02.04

11/04/2021

Proprietary information

Page 1

Table of Contents

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Summary of Contents for Ainstein US-D1

Page 1 2029 Becker Dr Lawrence, KS 66047 Radar Altimeter US-D1 User Manual D00.02.04 11/04/2021 Proprietary information Page 1...
Page 2 2029 Becker Dr Lawrence, KS 66047 Revision History Version Number Date Authors Notes D00.00.01 Mar 2, 2018 Jin Cheng, Sheen Xiao Draft based on engineering spec and customer requirements D00.00.02 April 10, 2018 Jin Cheng, Sheen Xiao Put customer requirements in development phases D00.00.03 September 10, 2018...
Page 3 2029 Becker Dr Lawrence, KS 66047 Copyright 2019 © Ainstein AI, Inc. All rights reserved. No part of this work may be reproduced, published, or distributed in any form or by any means (electronically, mechanically, photocopying, recording, or otherwise), or stored in a database retrieval system, without the prior written permission of Ainstein AI, Inc.
Page 4: Table Of Contents
2.1. Mounting Angle 2.2 Mounting to an Aircraft 2.3. Line of Sight Clearance 2.4. Integration Requirements 3. Operational Requirements 3.1 Obstruction to the US-D1 Field of View 3.2 Excessive Pitch/Roll 3.3 Terrain 3.4 Power Source 3.5 Orientation of US-D1 3.6 Minimum and Maximum Operating Altitude 4.
Page 5: Product Description
(altitude) is derived by the diﬀerence in time from when the signal is sent from the sensor to when the signal is received by the sensor The US-D1 is enclosed in a black plastic case, the radome, which is conducive to radar telemetry. The US-D1 has a short cable terminated with a connector.
Page 6: Installation Guidelines
2.1. Mounting Angle When mounting the device, the front face of the US-D1 must be perpendicular to the ground below the aircraft. There should not be any angle of inclination in any direction while the device is fastened to the aircraft.
Page 7: Line Of Sight Clearance
Additionally, keep any unexpected objects out of the radar’s FoV (Field of View). Obstructions to the US-D1’s ﬁeld of view will cause a decrease in the performance of the radar. It is highly recommended that the US-D1 be mounted on the underside of the aircraft far away from the landing gear, other aircraft structures, or other equipment.
Page 8 2029 Becker Dr Lawrence, KS 66047 angular orientation based on rate gyroscopes, accelerometer, compass, GPS, airspeed and barometric pressure measurements in addition to the recorded US-D1 measurements. Sensor redundancy is heavily advised for the US-D1. Proprietary information Page 8...
Page 9: Operational Requirements
US-D1 to worsen. This sensitivity increases with altitude. 3.3 Terrain Terrain with poor reﬂectivity may cause the performance of the US-D1 to worsen. Flying at the limit of the US-D1’s range over dry, loose soil, such as tilled farmland, or sand is not recommended. 3.4 Power Source Any power source used to operate the US-D1 that does not provide the minimum power and voltage can worsen the performance of the device or cause it’s operation to...
Page 10: Technical Specifications
2029 Becker Dr Lawrence, KS 66047 4. Technical Speciﬁcations Table 1: Speciﬁcations Frequency 24 GHz Band Bandwidth 190 MHz Minimum Operating 0.5 meters Altitude Maximum Operating 50 meters Altitude Altitude 6.0cm (< 1m), 4.0cm (> 1m) Precision Field of View 43 °...
Page 11 2029 Becker Dr Lawrence, KS 66047 ● Operational Temperature Range indicates radar works properly in this range. If operating temperature goes beyond this range, radar might not be accurate and can suﬀer mechanical damage. ● The radar unit can be shipped with either CAN or UART for it’s output data protocol.
Page 12: Data Protocol For Us-D1
2029 Becker Dr Lawrence, KS 66047 5. Data Protocol For US-D1 5.1 UART Data Protocol Speciﬁcations ● Baud Rate: 115200 b/s ● Data bit: 8 ● Parity bit: N ● Stop bit: 1 ● Voltage Level: 3.3V A single data packet consists of six(6) bytes. Table 2 deﬁnes the packet structure.
Page 13: Can Data Protocol Specifications
2029 Becker Dr Lawrence, KS 66047 ● Checksum: The Checksum Byte could be used in the following: ○ checksum = (Version_ID + Altitude_H + Altitude_L + SNR) & 0xFF ○ If checksum = 1, check passed ○ if checksum = 0, check failed 5.2 CAN Data Protocol Speciﬁcations ●...
Page 14 2029 Becker Dr Lawrence, KS 66047 Table 3: CAN Frame Data Packet Deﬁnition From US-D1 Altimeter Receiver Byte Data Note StdID 0x*** Standard ID frame EtdID 0x******** Extended ID frame (Default 0x00090002) 0x** Altitude (Most Signiﬁcant 8 Bits) 0x** Altitude (Least Signiﬁcant 8 Bits) 0x** SNR(Most Signiﬁcant 8 Bits)
Page 15: Mechanical Specifications
2029 Becker Dr Lawrence, KS 66047 6. Mechanical Speciﬁcations Figure 3: Dimensions of US-D1 (Units: mm) Proprietary information Page 15...
Page 16 2029 Becker Dr Lawrence, KS 66047 Figure 4: Field of View Orientation of US-D1 Proprietary information Page 16...
Page 17: Radiated Emissions
2029 Becker Dr Lawrence, KS 66047 7. Radiated Emissions The output ﬁeld strength generated by the US-D1 is within the acceptable range set by the FCC and CE. Maximum Transmit Power (EIRP) 25 dBm 8. Hardware Interface Table 4: Data Packet Deﬁnition...
Page 18: Accessories & Peripherals
9. Accessories & Peripherals 9.1. Firmware Update Kit The US-D1 Firmware Update Kit is an external device that can update the ﬁrmware of the US-D1 radar altimeter. The Firmware Update Kit contains an update tool, a USB connector, and power cable. The Kit allows the US-D1 to connect to the Firmware Update Tool via USB port, which allows the user to load and ﬂash new ﬁrmware...
Page 19: Application Notes
~0.51m when out-of-range, because 0.51m is the edge of the US-D1’s blind zone. When the US-D1 is close to the blind zone (<1m) and a highly reﬂective object is placed in between the US-D1 and the ground and then is...
Page 20 2029 Becker Dr Lawrence, KS 66047 object enters the FOV. Proprietary information Page 20...
Page 21 2029 Becker Dr Lawrence, KS 66047 Figure 6: US-D1 Altitude Drop-oﬀ Example Proprietary information Page 21...
Page 22: Hardware & Firmware Version
2029 Becker Dr Lawrence, KS 66047 11. Hardware & Firmware Version Firmware V1.8.2/V1.8.3 Bootloader V1.0.7 Hardware V2.1.0 Proprietary information Page 22...
Page 23: Firmware Changelog
2029 Becker Dr Lawrence, KS 66047 12. Firmware Changelog US-D1 Generation 1 Firmware Changelog Firmware Change Reason Date Version v1.0.6 Initial released version 3/24/2019 v1.3.1 Update data format 7/17/2019 v1.4.0 Improve performance at low 12/20/2019 temperatures v1.4.1 New customized data format...
Page 24 Lawrence, KS 66047 v1.5.2N Fix for out of range aliasing 3/13/2021 v1.8.2 Optimize boot sequence to ﬁx a 8/16/2021 altitude hang issue US-D1 Generation 2 Firmware Changelog Firmware Change Reason Date Version v1.5.3 Add support for new MCU 11/20/2020 model* v1.5.3N...
Page 25: Contact Us
2029 Becker Dr Lawrence, KS 66047 13. Contact Us ADDRESS: 2029 Becker Drive, Lawrence, KS 66047 USA EMAIL: hi@ainstein.ai PHONE: 785-856-0460 Proprietary information Page 25...