smartmicro UMRR-0A Operator's manual

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Project Documentation | UMRR-0A Radar Sensor Documentation
Project Number:
...
SMS Project Number:
Project Title:
General Purpose Radar Sensor
Keyword(s):
UMRR-0A radar sensor, type 31 antenna
Date:
August 22, 2013
Document:
UMRR-0Axxxx Type31 Operational Description.docx
Version:
1

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1Contents
1Contents.................................................................................................................... 2
2Abbreviations............................................................................................................. 3
3Introduction............................................................................................................... 4
4General description .................................................................................................... 5
4.1 Sensor description................................................................................................ 5
4.2 Transmit Signal.................................................................................................... 6
4.3 General Performance Data.................................................................................... 6
5Hardware .................................................................................................................. 7
5.1 UMRR sensor ....................................................................................................... 7
5.2 Sensor Dimensions............................................................................................... 9
6Cables and connectors.............................................................................................. 11
6.1 Sensor connector ............................................................................................... 11
7Data interfaces ........................................................................................................ 12
7.1 CAN data interface ............................................................................................. 12
7.2 CAN-Settings ..................................................................................................... 12
7.3 RS485 data interface.......................................................................................... 13
7.4 Transceiver schematics....................................................................................... 16
8Designated use ........................................................................................................ 17
9Frequency Approval.................................................................................................. 18
9.1 Declaration of Conformity for USA....................................................................... 18
9.1.1 FCC Label.................................................................................................... 18
9.2 Declaration of Conformity for CANADA ................................................................ 19
9.2.1 Declaration of Conformity in English.............................................................. 19
9.2.2 Déclaration de conformité en francais ........................................................... 19
9.2.3 Industry Canada (IC) Label........................................................................... 19

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2Abbreviations
ADC Analog-to-digital converter
CAN Controller area network
DAC Digital-to-analog converter
DSP Digital signal processing; digital signal processor
EEPROM Electrically erasable programmable read-only memory
FMCW Frequency modulated continuous wave
MMIC Monolithic microwave integrated circuit
RAM Random access memory
RS485 Physical communication layer standard EIA RS-485
SPI Serial peripheral interface
UMRR Universal medium-range radar

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3Introduction
This document is a short documentation of the general purpose universal medium range
radar (UMRR) UMRR-0Axxxx radar sensor with type 31 antenna in the housing version
0306xx.

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4General description
4.1 Sensor description
The main task of the UMRR is the detection of any reflectors in the field of view, to measure
the distance, the relative speed and the angle to the shortest reflector (and to other
reflectors), to detect motion and to track (filter) the results over time.
For this general purpose measurement application, range and relative radial speed and
the angle value of each reflector inside the antenna beam are measured and the results are
reported via the communication links cycle by cycle.
The UMRR sensor consists of two printed circuit boards: The DSP board and the RF
transceiver board.
The major component of the DSP board is the DSP TMS320F28335 which integrates flash
memory (for program code) and RAM. The DSP provides interfaces to external RAM,
EEPROM, CAN bus and RS485 (both for data communication). The DSP controls the RF
transceiver board via an SPI interface.
The RF transceiver board consists of transmit and receive antennae and the RF circuitry that
includes the radar MMIC SC3001.2. The radar MMIC generates the transmit signal and down
converts the receive signals into baseband. The analog baseband signals are then routed to
the DSP board and digitized by the DSP’s built-in ADC. The digital data are further processed
on the DSP.
The MMIC also features a PLL circuitry to calibrate and linearize the transmit frequency
ramps, a DAC for setting the VCO voltage (corresponding to the transmit frequency) and an
SPI interface for receiving the control signals from the DSP.
For the time of emission the device is one fixed point to point application.

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4.2 Transmit Signal
The UMRR transmit frequency is located in the 24 GHz ISM band (24050 MHz to 24250 MHz),
the used bandwidth is smaller than 200 MHz. The maximum transmit power is 12.7dBm.
Antenna type 31 is used, consisting of one transmit and two receive antennas, both linear
polarized. The 2 way 3 dB cut-off angle in azimuth ±28deg. and in elevation ±5deg.
The device uses different FMCW transmit signal waveforms for distance and speed
measurement.
4.3 General Performance Data
As soon as the device is powered up, the unit (TX and RX) starts operation.

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5Hardware
5.1 UMRR sensor
An example picture of a UMRR (universal medium-range radar) sensor (housing type 0306xx)
is shown in the figures below.
Figure 1: UMRR sensor, housing type 0306xx, front.

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Figure 2: UMRR sensor housing 0306xx rear

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5.2 Sensor Dimensions
All values given in mm.
Figure 3: Sensor Front side.
Figure 4: Sensor Top, Left and Right Side.

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Figure 5: Sensor Rear Side.

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6Cables and connectors
6.1 Sensor connector
The used sensor connector is an 8-pin male circular connector (water proof IP67, series 712,
manufacturer Binder GmbH, Germany). A female counterpart has to be used to connect to
the sensor. The pin numbering of the female connector is shown in Figure 6 the pin out of
the connector is shown in Table 1.
Figure 6: Female counterpart of sensor connector (rear view)
Pin
Function
Wire color
1
RS485 L
Pink = RS_485_L
2
Ground
Blue = GND
3
RS485 H
Grey = RS_485_H
4
CAN_L
Yellow = CAN_L
5
CAN_H
Green = CAN_H
6
not connected
Brown = n.c.
7
+7V…+32V
Red = Vcc (+7V…+32V)
8
not connected
White = n.c.
Table 1: Sensor connector pin out Model UMRR-0Axxxx
Please note that in the standard configuration the sensor has no 120Ohms resistor on board
(CAN bus termination between CAN_L and CAN_H). The resistor is nevertheless required at
either end of a CAN bus and is in most cases integrated in the cable delivered along with the
sensor (if cable is manufactured by Smartmicro).

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7Data interfaces
7.1 CAN data interface
This specification gives a detailed description of the CAN data communication used in the
UMRR based systems on the sensor CAN. The UMRR is compliant with CAN 2.0B standard.
CAN is a very robust full duplex bidirectional interface.
7.2 CAN-Settings
Baud Rate: 500kBit/s or lower
Tseg1: 8
Tseg2: 7
Tsjw: 1 (SJW: synchronization jump width)
Above values for CAN bit timing are illustrated in Figure 7 for the DSP TI TMS320F28335
used in the UMRR radar sensor (note: the eCAN module is integrated in the DSP). For
comparison purposes, in Figure 8 the CAN bit timing as defined by the CAN protocol is
shown. For the DSP TMS320F28335 the value of SYNCSEG (Figure 7) is always equal to 1 TQ
(Time Quantum) and it corresponds to the value Sync in Figure 8. TSEG1 (Figure 7)
combines the two time segments Prop and Phase 1 (Figure 8) as defined by the CAN
protocol. TSEG2 (Figure 7) corresponds to Phase 2 (Figure 8)
The CAN bit timing parts as defined by the CAN protocol (Figure 8) can be described as
follows:
Sync: This part of bit time is used to synchronize the various nodes on the bus. An
edge is expected to lie within this segment. For the UMRR sensor, this segment is
always 1 TIME QUANTUM (TQ).
Prop: This part of the bit time is used to compensate for the physical delay times
within the network. It is twice the sum of the signal’s propagation time on the bus
line, the input comparator delay, and the output driver delay. For the UMRR sensor,
this segment is programmable from 1 to 8 TIME QUANTA (TQ.
Phase 1: This phase is used to compensate for positive edge phase error. For the
UMRR sensor, this segment is programmable from 1 to 8 TIME QUANTA (TQ) and
can be lengthened by resynchronization.
Phase 2: This phase is used to compensate for negative edge phase error. For the
UMRR sensor, this segment is programmable from 2 to 8 TIME QUANTA (TQ) and
can be shortened by resynchronization.

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Figure 7: CAN bit timing for UMRR sensor (eCAN module on DSP TMS320F28335)
Figure 8: CAN bit timing as defined by the CAN protocol
7.3 RS485 data interface
The RS485 interface from the UMRR sensor has a predefined speed of 230400 baud/s.
Typical other data rates are between 921.6kBit/s and 56.7kBit/s.
The RS485 message payload is identical to the CAN format. The data messages will be sent
in several packets of one byte.
Every cycle begins with a start sequence and ends with a calculated checksum and an end
sequence. The length of the data payload depends on the number of targets and tracked
objects.
Every cycle has one start sequence one end sequence and one checksum.

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Table 2: RS485 message structure
Byte\Bit
7
6
5
4
3
2
1
0
0
Start sequence (4 x UINT8)
0xCA
1
0xCB
2
0xCC
3
0xCD
x
Data payload (n x UINT8)
x
x
x
x
x
x
x
0
XOR Checksum (UINT8)
1
End sequence (4 x UINT8)
0xEA
2
0xEB
3
0xEC
4
0xED
Every data message consists of its own message ID, the number of used data bytes and the
data bytes itself.
The checksum is calculated on all data except the start sequence and the end sequence. The
Checksum is a simple XOR Assignment of all n data bytes.
Byte0 XOR Byte1 XOR Byte2 ... XOR Byte (n-1)

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Table 3: Structure of a RS485 data payload block
Byte\Bit
7
6
5
4
3
2
1
0
0
CAN message ID (UINT16)
High
1
Low
2
CAN message length (UINT8)
3
CAN data payload (length x UINT8)
4
5
6
7
8
9
10
The sensor receives only one message per cycle. It is important to wait for the end sequence
to send an additional command.

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7.4 Transceiver schematics
In Figure 9 an extract of the DSP board schematic of the UMRR is given. As can be seen in
this figure, the CAN pins of the DSP TMS320F28335 are connected to a CAN transceiver
which is connected to the pins CAN_L and CAN_H. Similarly, the RS485 pins of the DSP are
connected to a RS485 transceiver, which is connected to the pins RS_485_L and RS_485_H.
It should be noted that the mentioned pins CAN_L and CAN_H correspond to the pins 4 and
5 of the sensor connector described in section 6.1 and that the pins RS_485_L and
RS_485_H correspond to pins 1 and 3.
Figure 9: UMRR-0Axxxx DSP board schematics: CAN and RS485 transceivers

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8Designated use
The UMRR general purpose medium range radar is suitable for any application where the
distance to and relative radial speed of large objects has to be measured.
Typical applications are:
Automotive: measure shortest distance to obstacle.
Robotics: measure shortest distance to obstacle.
Security: detect motions and measure distance to moving object.
Traffic management: detect moving objects, count those, measure speed and measure
distance to moving object.
Cranes: measure distance to ground.
Aircraft: measure distance to ground.
The detection range depends on object size. Very large reflectors can be detected at a range
of more than 500 m.

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9Frequency Approval
9.1 Declaration of Conformity for USA
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
Usually this is followed by the following FCC caution:
Any changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate this equipment.
Note: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may case harmful interferences to radio communications. However,
there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more following
measures:
-Reorient or relocate the receiving antenna
-Increase the separation between the equipment and receiver
-Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected
-Consult the dealer or an experienced radio/TV technician for help.
9.1.1 FCC Label
Figure 10: FCC Label
Figure 11: FCC ID

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9.2 Declaration of Conformity for CANADA
9.2.1 Declaration of Conformity in English
This device complies with RSS-310 of Industry Canada. Operation is subject to the condition
that this device does not cause harmful interference.
9.2.2 Déclaration de conformité en francais
Cet appareil est conforme au CNR-310 d'Industrie Canada. Son exploitation est autorisée
sous réserve que l'appareil ne cause pas de brouillage préjudiciable.
9.2.3 Industry Canada (IC) Label
Figure 12: Label IC Model (Sample)
Figure 13: RSS310 Label