Search/Track Properties reports all the
settings in the Radar Basic->Search/Track property page.
| Name |
Dimension |
Type |
Description |
| Enabled |
Unitless |
Text |
Reports out if the SAR (synthetic aperture radar)
mode has been turned on. |
| Mode |
Unitless |
Text |
Reports which mode, Fixed PRF or continuous wave,
has been selected in the search and track properties of the
radar. |
| PRF |
PRFUnit |
Real Number |
Reports out the pulse repetition frequency - range:
0.1 to 1000 kHz. |
| Unambig Range |
DistanceUnit |
Real Number |
Reports out the desired target range for which
unambiguous data is required. The Range is ambiguous where the true
target range is greater than the ambiguous range as computed by
radar. The Unambiguous Range constraint denies access when the
range is ambiguous (i.e. it enforces a low PRF mode). |
| Unambig Vel |
DopplerVelocityUnit |
Real Number |
Reports out the desired target velocity for which
unambiguous data is required. The Velocity is ambiguous where the
true target velocity is greater than the ambiguous velocity value
as computed by radar. The Unambiguous Velocity constraint denies
access when the velocity is ambiguous (i.e. it enforces a high PRF
mode). |
| Pulse Width |
SmallTimeUnit |
Real Number |
Reports out the width of the transmitted pulse (the
inverse of uncompressed RF bandwidth) if SAR mode has been enabled
and this factor has been selected. |
| Duty Factor |
Unitless |
Real Number |
Reports out the duty cycle set in the Search/Track
properties for the radar. The duty cycle of a radar is the ratio of
the pulse width to the pulse-repetition period. The default value
for Pulse Width is 0.1 microseconds. |
| MLC Filter
Enabled |
Unitless |
Text |
Reports out whether or not this optional parameter,
the MLC filter, has been turned on. |
| MLC Filter
Bandwidth |
DopplerVelocityUnit |
Real Number |
Main lobe clutter bandwidth is the total filter
width about the MLC velocity. Reports out the bandwidth in the
Doppler velocity unit that has been set. The default value is 0
m/s. |
| SLC Filter
Enabled |
Unitless |
Text |
Reports out whether or not this optional parameter,
the SLC filter, has been turned on. |
| SLC Filter
Bandwidth |
DopplerVelocityUnit |
Real Number |
Side lobe clutter bandwidth is the bandwidth about
the altitude line. Reports out the appropriate bandwidth in the
Doppler velocity unit that has been set. The default value is 0
m/s. |
| Probability of False Alarm |
Unitless |
Real Number |
Reports out the probability of false alarm that the
user has set. The probability of false alarm is the probability
that a target is declared to be present when in fact none exists.
Enter a value in the range 0-1. |
| CFAR Enabled |
Unitless |
Text |
Reports out whether or not this optional parameter
has been turned on. |
| CFAR Reference
Cells |
Unitless |
Integer |
This parameter is optional but if it has been
turned on this will report out the desired integer value that has
been set. |
| Single Pulse Detection
Threshold |
RatioUnit |
Real Number |
Mitchell Walker detection threshold is one of the
ingredients for computing Pdet. Refer to Mitchell, Walker,
Recursive Methods for Computing Detection Probabilities?, IEEE
Trans. On Aerospace and Electronics Systems, Vol AES-7, No. 4, July
1971. Note: The integration that STK performs for the purpose of
computing integrated Pdet is non-coherent. In non-coherent
integration, each pulse is passed through the detection process and
generates a voltage in the detector. The individual voltages are
then summed together for the number of pulses to generate the
non-coherent integrated SNR. Using this value and the number of
pulses integrated, we compute the average single pulse SNR. The
Mitchell Walker formulas require this average single pulse SNR as
an input along with the detection threshold, the number of pulses
integrated and the statistical model for fluctuations in the
per-pulse SNR. |
| Single Pulse CFAR Multiple |
Unitless |
Real Number |
Mitchell Walker CFAR alpha value is one of the
ingredients for computing the CFAR Pdet; the detection threshold
for CFAR is the single pulse value multiplied by alpha. |
| Integrated
Pulses |
Unitless |
Integer |
The number of pulses summed in the signal
processing. For Radars that use FFT (Doppler) processing, the
number of pulses in the FFT is the number of pulses integrated. FFT
is an example of coherent integration (I and Q channels summed
before detection). Other radars use non-coherent integration
(summing the post-detector amplitude). Coherent radars typically
have lossless integration, whereas non-coherent systems have a loss
and there are several common models to represent the loss. All of
these cases are represented in STK/Radar. Note: The integration
that STK performs for the purpose of computing integrated Pdet is
non-coherent. In non-coherent integration, each pulse is passed
through the detection process and generates a voltage in the
detector. The individual voltages are then summed together for the
number of pulses to generate the non-coherent integrated SNR. Using
this value and the number of pulses integrated, we compute the
average single pulse SNR. The Mitchell Walker formulas require this
average single pulse SNR as an input along with the detection
threshold, the number of pulses integrated and the statistical
model for fluctuations in the per-pulse SNR. |
| Integration Time |
SmallTimeUnit |
Real Number |
Reports out the time required to integrate the
number of pulses necessary to achieve the Goal SNR. |
| Integrated SNR
Goal |
RatioUnit |
Real Number |
For N pulses perfectly (coherently) integrated, the
integrated SNR will be N * SNR1, where SNR1 is the single pulse
SNR. When non-coherently integrated, the value will be less. |
| Integration Mode |
Unitless |
Text |
How STK computes the integrated SNR is one of four
possible values: 1.) Perfect Integrator 2.) Constant Efficiency 3.)
Pulse Number Exponent 4.) Gain File Note-STK has four different
ways to calculate the mean SNR for integrated pulses as indicated
by the integration mode. Perfect Integrator mode results in the
mean SNR for the Mitchell Walker formulas being the same as the
single pulse SNR. Users can impose signal processing losses by
using the Constant Efficiency or Pulse Number Exponent modes. Users
may also specify an external file that constrains the choice of
pulses integrated and the resulting integration gain |
| Integration Gain Value |
Unitless |
Real Number |
The amplifying information from the UI for the
selected mode. |