FILTRONIC RWR

Man Portable Radar
Warning Receiver
For Covert and U.A.V.
Applications
Figure 1 RWR Unit
Introduction
The unit is designed for Radar Warning Receiver (RWR) applications where small size and low power
consumption are of prime importance, with filtering, amplification, detection and frequency
measurement being combined into one multi-function unit.
Figure 2 shows a block diagram of the RWR and its three integral RF modules. Two amplitude
measurement channels allow direction finding by amplitude comparison between adjacent antennas.
One of these channels is also used in standby mode for detecting the presence of signals by polling
round the antennas. A two-tier discriminator, fed from one of the amplitude channels via an SPDT
switch, performs frequency measurement. Frequency resolution is nominally 160 MHz over an 8 to 18
GHz band.
Video
Output
Linear
Amplifier
Limiting
Amplifier
N
Trigger
S
IFM
Inputs
E
Digital
Data Out
DLVA
W
Bandpass
Filter
Video
Output
Figure 2: Radar Warning Receiver Block Diagram
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602 Fax:+44 (1274) 539724 Email: [email protected]
Page 1 of 1
Man Portable Radar Warning Receiver
Electrical Specifications
Operating temperature range 0ºC to 70ºC
Characterised at 25ºC.
Table 1: Electrical Specifications
Parameter
Amplitude Module
Frequency Module
Operating Frequency
8 to 18 GHz
8 to 18 GHz
Operating Dynamic Range
-73 to 0dBm
-43 to –5 dBm
Frequency Measurement Resolution
-
150 MHz nom.
Frequency Measurement Accuracy
-
<200 MHz r.m.s.
Minimum Pulse Width
-
100 ns
Triggering
-
External Command
Trigger to Data Delay
-
<100 ns max.
Out of Band Rejection
d.c. to 7 GHz > 60 dB
20 to 26 GHz > 30 dB
-
-73 dBm
-
-70 to -30 dBm
-
Frequency Flatness (Video)
±2.5 dB
-
Amplitude Tracking (Between any Two Modules at the
Same Frequency and Temperature)
±1 dB
Typical
-
30ns Typ 70 ns Max
-
50 mV/dB
-
±1 dB
-
Active d.c. restored
-
50 %
-
>30 dB Typ
>30 dB Typ
RF Input Switch Speed
<5 µs
<5 µs
RF Input Switch Control
TTL
TTL
27dB nominal
-
Tangential Signal Sensitivity (8 dB Video SNR)
Logging Range
Video Rise Time
Video Output Slope
Logging Linearity
Video Coupling
Maximum Duty Cycle
RF Input Switch Isolation
Insertion Gain RF Input to RF Output
Insertion Ripple
±2dB
Input Return Loss
7dB min (10dB typ)
Power Supply Current (operating - no rf)
+6 V at 130 mA
-6 V at 50 mA
+6 V at 200 mA
-6 V at 30 mA
Power Supply Current (standby)
+6 V at 50 mA
-6 V at 50 mA
+6 V at 120 mA
-6 V at 30 mA
Power-up Time (standby to on)
<100 µs
<100 µs
Power-up Time (cold start)
<30ms
<2ms
4 x 1 x 0.25 inches
101.6 x 25.4 x 6.35 mm
4 x 2 x 0.25 inches
101.6 x 50.8 x 6.35 mm
50 grams
85 grams
SSMA Female
Dynawave
Dimensions
Weight 2
Microwave Input Connector
1
2
1
not including amplitude module gain
plus 10 grams for the interconnect module
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: [email protected]
Page 2 of 2
Man Portable Radar Warning Receiver
System Timing
The operation of the frequency measurement unit is as follows:
When r.f. enters the discriminator circuits, the video voltages settle after a delay
depending on the video bandwidth. The video signals are then stable and can be
digitised by the comparators and ASIC. This digitization takes a maximum of 15 ns
(ASIC worst case timing). Therefore valid raw frequency data is available 75 ns after
the leading edge of the r.f. pulse. The raw frequency data is decoded in the EPROM
look-up table which takes 55 ns.
Figure 3: System Timing Diagram
r.f.
trfhld
video out
tlatch
LATCH
tlpw
tdig
tlhold
Raw Data
tdechold
tdecode
Data Valid
Frequency Data Out
tmeas
Table 2: Timing
Description
time between latch edge and trailing edge of r.f
time from leading edge of r.f. and latch edge
Width of latch pulse
time to digitise video
time from latch disable and raw data invalid
time to decode raw frequency data
time to hold decoded frequency data
time from start of r.f. to valid frequency out
symbol
trfhld
tlatch
tlpw
tdig
tlhold
tdecode
tdechold
tmeas
min
6
60
5
max
15
10
55
7
130
units
ns
ns
ns
ns
ns
ns
ns
ns
The LATCH signal holds the digitised frequency data when it is in the logic high
state. When the LATCH signal is low, the digitising circuits are transparent and the
data buses may change state rapidly increasing current consumption, thus to reduce
this effect the latch signal should be held high and digitising initiated by a narrow
logic low pulse. In order to capture 100 ns pulses the rising edge of the LATCH signal
must occur no later than 94 ns after the start of the r.f. pulse.
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: [email protected]
Page 3 of 3
Man Portable Radar Warning Receiver
Application Information
The Amplitude Measurement Module and the Frequency Measurement Module are
designed to be used together as the front end for a Radar Warning Receiver. The
configuration described here has two Amplitude Modules facilitating direction of
approach measurement from 4 directional antennae. If desired, only one Amplitude
Module can be used in conjunction with an omni directional antenna forming a simple
Radar Warning Receiver for simple classification of the threat signal. The unused
input ports must be terminated with 50Ω loads.
Both modules feature a power saving standby mode that turns off the bias to the
microwave amplifiers. The power supply can be removed completely for better
power efficiency but there is a penalty to pay in start-up time as the modules
incorporate switch mode DC-DC converters that take time to stabilise. The amplitude
module also incorporates a CW removal circuit which can take up to 30ms to
stabilise.
The frequency measurement module requires an externally generated latch signal to
hold the frequency data word on the digital output. This can be derived from the
amplitude measurement video output or from some other source. The responsibility
for generating the latch rests with the application circuit. Refer to figure 3 for timing
information for the latch generation.
Options and Future Developments
Other configurations may be possible, e.g., SMA connectors instead of SSMA,
custom outline, different logging range, etc. In addition Filtronic is developing this
product further to provide extended frequency range and a back end control system to
integrate the trigger, direction of approach and emitter characterisation functions.
Please contact the factory for further details.
While every effort is made to ensure the accuracy this release, please check with the
factory for the latest information.
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: [email protected]
Page 4 of 4
Man Portable Radar Warning Receiver
Typical Performance Data
Figure 4: Log plot at 8 GHz
Figure 5: Log plot at 13 GHz
Figure 6: Log plot at 18 GHz
Figure 7: Frequency Flatness at –50dBm input
Figure 8: Cell size distribution - CW
Figure 9: Frequency accuracy - CW
Figure 10: Cell size distribution – 100ns pulse
Figure 11: Frequency accuracy – 100ns pulse
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: [email protected]
Page 5 of 5
Man Portable Radar Warning Receiver
Connector Details
The Frequency Measurement Module connector is a 15 way Nanonics® Dualobe®
single row receptacle. The mating part is a 15 way single row plug with wire leads.
Example part number: SSM015PC2DC012N
Table 4: Frequency Measurement Module Connector Designations
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Type
POWER
POWER
POWER
POWER
IN TTL
OUT TTL
OUT TTL
OUT TTL
OUT TTL
OUT TTL
OUT TTL
IN TTL
IN TTL
POWER
POWER
Signal
+6V
+6V
-6V
DGND
Input Select
D0
D1
D2
D3
D4
D5
Trigger
Standby (active low)
GND
GND
The Amplitude Measurement Module connector is a 9 way Nanonics® Dualobe®
single row receptacle. The mating part is a 9 way single row plug with wire leads.
Example part number: SSM009PC2DC012N
Table 5: Amplitude Measurement Module Connector Designations
Pin
1
2
3
4
5
6
7
8
9
Type
POWER
POWER
POWER
GND
IN TTL
IN TTL
GND
OUTPUT
GND
Signal
+6V
+6V
-6V
Power Ground
Antenna Select
Standby (active low)
Digital Ground
Video Output
Video Ground
The mating connectors are available from:
Nanonics® Corporation
Call (623) 581-6188 or Fax (623) 581-8242
21644 North 14th Ave., Phoenix, Arizona 85027-2840
email: [email protected]
www.nanonics.com
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: [email protected]
Page 6 of 6
Man Portable Radar Warning Receiver
Figure 12: Outline and fixing details
© Filtronic Components Ltd – All rights reserved. Unauthorised reproduction prohibited.
Man Portable Radar Warning Receiver - rev 1.1 - March 2001
Specifications subject to variation without notice. Check with factory for latest.
E&OE
Filtronic Components Ltd., Airedale House, Royal London Industrial Estate, Acorn Park, Shipley,
West Yorkshire, BD17 7SW, United Kingdom.
Tel: +44 (1274) 531602, Fax: +44 (1274) 539724, Email: [email protected]
Page 7 of 7