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The following
alphabetical listing identifies and broadly defines the Fields employed
in the Radar Emitter Database (REDB). All data is entered into the base
on a mode per line basis except where there may be conflict between
those sources of information then, additionally, data is entered on
a mode & source per line basis. Each line of data has a separate
mode number: For quick reference, where there is an expanded explanation,
the Database Field Title is emboldened and the Section number
is shown in Red
| Field Title |
Definition and Section Number |
| AEG |
Antenna
Gain of the main beam is given in dBs |
| AGbw |
Agility
Bandwidth is the maximum bandwidth over which the radar is known
or reported to be frequency agile, or tuneable, with a given transmission
source. Results of 25 MHz or less indicate the pulse receiver's
reported bandwidth governed by the transmission pulse duration. |
| Alias
1, 2 |
These
fields note the major alternative names, designators or sequence
of characters by which an emitter may also be known but they only
carry one alias each. All additional lesser aliases are stored in
Alias 3. |
| Alias
3 |
This
field retains all other aliases by which an emitter might be known. |
| Antenna |
Basic
indication of antenna type. This has three associated fields; Width
(cm), Height (cm), Diameter (cm). This data may be used to support
radar hazard calculations. |
| Ass
Platform |
Records
the commercial or military PLATFORMS associated with the named EMITTER
or the location by name or latitude and longitude. Where the information
is complex individual solutions may be followed by a country code
in parenthesis. e.g. (UK) |
| Ass
Weapon |
Major
WEAPONS known to be fitted on the associated PLATFORM or to be commonly
associated with the named EMITTER for the indicated USER Country(ies) |
| AvPW |
Average
transmitter power in Watts. When they are both available in a single
emitter mode, AvPW and PEPkW values are used to calculate the Duty
Cycle (DCpow). (See below) |
| AzArc |
The
AzArc Fields define the number of degrees in azimuth through which
the antenna array may be made to train or scan, for other than circular
scan systems (0° to 360° - scan code A) either under local or remotely
controlled conditions. Section
9 |
| AzArcL |
AzArcL
states the number of degrees to the left of a selected bore-sight
through which the emitter’s antenna may scan. Mainly applicable
to sector scanners (scan code B) and active phased arrays (scan
code Pa) with a look forward, look back capability. Section
9 |
| AzArcR |
AzArcR
gives the number of degrees to the right of a selected bore-sight
through which the emitter’s antenna will scan. This will normally
be 360° indicating a circular scanner, scanning clockwise, or an
equal number of degrees to that recorded in the AzArcL which would
imply a sector scanner or an active phased array (scan code Pa)
with a look forward, look back capability. Section
9
An example of a circular scanner scanning clockwise would be
0.00 – 360.00 in AzArcL and AzArcR respectively. An Omni-direction
emission is recorded as -360.0 & 360.0 respectively. In the
case of a scanning phased array the result might be given as 300.00
– 420.00 respectively, implying that there is a 60 degree look back
and look forward capability about any point in a 360 clockwise rotational
period. Section 9 |
| Band |
This
field shows the (NATO defined) RF band in which the transmission(s)
takes place. If the RF straddles
two adjacent bands, or transmits in two non-adjacent bands, both
bands will be shown. eg: EF. If the emitter is multi-banded, such
as a radar jammer, it will be indicated by a hyphen between the
extreme values, e.g: H-J. NATO band designators are given at Section
16. |
| Beamwidths |
Where
a beamwidth has not been reported but the antenna's dimensions are
available, they may be used to approximate the antenna beamwidths.
See page 46 in Section 9. |
| Chirp
[& Chip] |
States
the changing RF value (Chirp) in MegaHertz (MHz) caused by intra-pulse
modulation. The suffix indicates whether the RF changes up (U) or
down (D) with time, or whether their direction is unknown (Z). (eg.
25D would indicate a 25 MHz Downward frequency transition). Where
phase modulation (PMOP) is employed, this field will record the
number of phase steps (Chips) within the pulse. A Chip is defined
as the shortest period of time for which the pulse exhibits a fixed
phase value.
This field may also be used to indicate an audio frequency shift
as used in Frequency Shift keying (FSK), but in this case no directional
or pulse compressive information will be shown.
|
| CoPD |
Gives
the duration of the processed compressed pulse in microsecs. Although
this characteristic cannot be intercepted, knowledge of its value
indicates the radar's minimum target discrimination range and, for
ship or airborne emitters, the increased probability of a military
application. Section
8 |
| CoS2 |
Gives
the elevation angular cover in degrees for a cosecant-squared antenna
pattern. See also VBW. |
| CSF |
This
field allows for a simple, two-character indication of any Complex
Scan Function that may be employed. These antenna scan functions
are explained in detail in Section
9. |
| Duty
Cycle |
The
reported Duty Cycle of an emitter is recorded in one of two fields
down to six decimal places. The values in these two fields may take
one of three forms in the following priority order:
DCpint If
there is no equation in this cell any value is as reported from
an authoritative source, which will be listed as a data source.
DCpint
Given no authoritative source for the DC but the availability
of PRI and PD data, then the Pulse Duration divided by the Pulse
Repetition Interval (in microsecs) is recorded in the DCpint field
and will be recognised by an equation in the cell when it is selected.
[=sum(PDma / PRIma)].
DCpow
Where power values only are available in a single mode, then the
result of Average Power divided by Peak Power (in Watts) is recorded
in DCpow:
[=sum(AvPW/PEPkW) / 1000)].
It should be
noted that, given sufficient data, both DCpint and DCpow may be
satisfied and their values may, therefore, be compared. (see
also page 26)
|
| Diameter
cm |
A
dish or parabolic shaped antenna aperture’s diameter is recorded
in centimetres. |
| ElArc |
The
ElArc fields define the number of degrees in elevation through which
the antenna may be trained or scanned under local or remote control
conditions. |
| ElArcN |
ElArcN
defines the number of degrees in elevation below the emitter’s stabilized
horizon through which the antenna may be made to scan electronically
or mechanically, but note this does not have to be a negative number. |
| ElArcP |
ElArcP
defines the number of degrees in elevation above the emitter’s stabilized
horizon through which the antenna may be made to scan electronically
or mechanically and may be any value up to 180°. i.e. the scanner
can be made to pass through the zenith and look ‘backwards’. In
the case of airborne emitters, this may also be a negative value.
(See US Research labs WASSAR radar). |
| ERPkW |
Estimated
Radiated Power level in kW (theoretically = PEP x AeG).
However, solutions given are those supplied by the emitter's
manufacturer only. Because PEP and AEG are so often misreported
ERPkW is not computed. |
| FN1 |
Identifies the
sensors operating platform by generic type in Section
11.
|
| FN2 |
Identifies
the sensor's primary operating function in Section
13. |
| HBW |
Horizontal
3dB Beam Width of the antenna in degrees |
| Height
cm |
The
antenna aperture’s heights is recorded in centimetres. |
| Height
ft |
A
radar’s detection height is given in feet for a particular target
RCS. Where the RCS is not known the radar’s reported maximum (instrumented)
operational height is recorded. |
| Instrumented
PRF |
TThis
is the PRF calculated from the instrumented (target detection) range,
also called the maximum theoretical unambiguous range (MTUR - see
below), recorded in the Range km field. Further details are in Section
|
| ISD |
Tabulates
the emitter’s first reported In-Service-Date where a User is listed,
otherwise it indicates the equipment's promotion year. |
| MODE |
Each
line of data is considered to be a Mode, where the transmission
characteristics of a given emitter differ from those of the same
emitter in the previous line. Each Mode carries a separate Mode
Number |
| MTBF |
Indicates
the reported Mean Time Between Failures, in hours |
| MTTR |
Indicates
the reported Mean Time To Repair, in minutes |
| MTUR |
Maximum
Theoretical Unambiguous Radar Range. Detail in Section 6. |
| NAT |
Identifies
the Country of origin of the sensor’s Manufacturer from the Country
Decode listing at Section 12. |
| Nf |
This
is the radar receiver Noise factor expressed in decibels. |
| PCr |
This
is the reported pulse compression ratio. Section
8. |
| PD
Tables |
Lists
the minimum (PDmi) and maximum (PDma) values of Pulse Duration in
microseconds (µs) |
| PDC |
The
Pulse Duration Characteristic field gives a simple indication of
the pulse stability at Section 7. |
| PEPkW |
Peak
Emitter Power in kW. (emitter tube power). When they are both available
in a single emitter mode, AvPW and PEPkW values are used to calculate
the Duty Cycle (DCpow). (See above) |
| PMC |
The
Pulse Modulation Characteristic identifies the modulation type or
waveform technique employed from the listings at Section
8 |
| Pol |
A
single character code that identifies the transmission polarisation
from the listing at Section 10. |
| PRC |
Gives
the Pulse Repetition Characteristic applicable to the PRF &
PRI Fields from the codes at Section 6. |
| PRF
Fields |
Lists
the minimum (PRFmi) and maximum (PRFma) values of Pulse Repetition
Frequency in pulses per second (pps) or, in the case of data transmissions,
the minimum and maximum data rates respectively in bits per second
(bits/sec). |
| PRI
Fields |
Tabulates
the minimum (PRImi) and maximum (PRIma) values of Pulse Repetition
Interval in microsecs, which are calculated as the mathematical
reciprocals of PRFma and PRFmi respectively. When available the
PRIma and PDma data are used to calculate the Duty Cycle (DCpint).
(see above). |
| Radar
Name |
Indicates
the sensor manufacturer's product name, identifying number or, typically
the radar's official military designator. The US Army Navy (AN/…)
military nomenclature scheme is tabulated at Section
19. However,
there are occasions when a radar's location and its parameters are
known but not its identity. In these cases the radar is given the
arbitrary name of its location. For example PATSCHERKOFEL RADAR
which is a weather profiling radar in Austria. If neither the name
nor location of a radar is known it is given a ZZ+ numeric notation.
The naming of emitters is quite a complex issue and is further amplified
at Sections 16 [Radar Nomenclature]
and Section 17 [Radar Acronyms]. |
| Range
km |
A
radars detection range is reported in kilometres for a given target
RCS. Where the RCS is not known, if available the radar’s reported
maximum operational range is recorded. |
| Remarks |
A
free text field used to comment about any aspect of the emitter;
its technology, ownership or operation. |
| RFb |
States
the number of elevation beams generated by the radar’s antenna and
associated transmission feed assembly. |
| RFC |
Lists,
as a single character code from Section 3
the radar's basic Radio Frequency Characteristics. (See
also Sections
4 & 5) |
| RF
Fields |
Lists
the minimum (RFmi) and maximum (RFma) Radio Frequency values in
MegaHertz (MHz), down to three decimal places, between which the
emitter may be found to operate. |
| RFs |
The
number of radio frequencies (RFs) used either singly, simultaneously
or sequentially during one complete cycle of a transmission. Section
5 |
| RxSen |
Gives
the radar receiver system sensitivity in –dBm. This is usually reported
as the minimum discernible signal level. |
| SLL |
Stores
the strongest (normally the first) Side Lobe Level in dBs without
reference to any angular offset from the main beam boresight. |
| SP
fields |
Tabulates
the minimum (SPmi) and maximum (SPma) Scan Periods in seconds for
primary scans or the Hertzian rates for secondary or complex scans.
Thus it is important these fields are read concurrently with field
ST, to ensure correct interpretation of antenna data type and associated
rate. |
| ST |
Indicates
a radar antenna's Scan Type from the coding at
Section 9. (see
also CSF) |
| Status |
This
field remains blank unless the emitter is known to be under development
(Dev) is a demonstration model (Dem) or is obsolete (Obs). It is
designed to assist data sorting. |
| STG |
Gives
the number of PRF / PRI Stagger levels employed.
Also used to indicate the number of pulses in a group transmitted
as one of a regular pattern of groups. The translation of Stagger
or Group will be indicated by the use of codes G, K, L or R in the
PRC Field. (See also Section
6). |
| Target
RCS |
The
targets Radar Cross Section (RCS) is given in whole or fractions
of a square metre. There are two associated fields where the detection
values for Range (km) and Height (ft) can be recorded for a given
target RCS. |
| User |
Identifies
known User Countries by the Country Code listed at Section
14. |
| VBW |
This
is the Vertical Beam Width of the antenna in degrees.
Where the radar antenna is known to have a cosecant squared
radiation pattern, the maximum angle of the cosec2
cover diagram will be quoted in the Cos2 field. Generally, any angle
greater than 10 degrees can be considered to be a cosec2
radiation pattern if multiple elevation beams are not reported in
the RFb Field. Where values appear in both the VBW and Cos2 fields,
this would imply the dimension of an individual beam and the sum
of the beams respectively that create the cosecant squared pattern.
Where this might alternatively indicate a switched antenna beam
function this will be noted in the remarks field. |
| Width
cm |
The
antenna’s aperture width is recorded in centimetres. |
| Z |
As
a single character, wherever it appears in the database, Z is taken
to mean Undetermined or Unknown. |
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e-mail:
info@radars.org.uk
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2392 251635, Mobile +44 07802 709247
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