SearchTrack Properties
Reports the settings in the Radar Basic->Search/Track property page.Available for these objects: Radar
Type: Fixed data.
Availability: Reports
Data Provider Elements
| 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 | PRF | Real Number | Reports out the pulse repetition frequency - range: 0.1 to 1000 kHz. |
| Unambig Range | Distance | 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 | DopplerVelocity | 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 | SmallTime | 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 | DopplerVelocity | 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 | DopplerVelocity | 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 | Ratio | 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. 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. 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 | SmallTime | Real Number | Reports out the time required to integrate the number of pulses necessary to achieve the Goal SNR. |
| Integrated SNR Goal | Ratio | 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. |