The model inputs that govern laser shot coverage, characterize the instrument system, laser and signal processing are entered via a series of input screens.
Platforms supported in the LSM are satellites and aircrafts. Future platforms that are intended to be included are balloon and ground-based systems.
SATELLITE
Orbit Inclination Angle
The starting inclination angle of the satellite orbit counter-clockwise from starboard.
Pointing Offset
Accuracy of platform attitude knowledge (bias).
Pointing Jitter
Unrecorded high frequency variation in platform attitude.
AIRCRAFT
Aircraft Inventory
The user chooses an existing aircraft flight file from the inventory.
Aircraft Heading
Overall heading adjustment made to the existing aircraft file.
Aircraft Attitude Option
There are three aircraft attitude options: do not include roll, pitch yaw effects, use roll. pitch, yaw effects from the aircraft file , roll, pitch, yaw effects computed by model.
LATITUDE/LONGITUDE
Starting location of the satellite or a location adjustment of the aircraft flight track.
ALTITUDE
Starting Altitude of the Satellite or Aircraft.
Laser Energy
The transmitted energy of the laser pulse.
Laser Wavelength
The wavelength of the laser.
Pulse Duration
The length of the laser pulse expressed in time.
Frequency Stability
The standard deviation of the output frequency.
Peak PRF
Maximum pulse repetition frequency capability over short time intervals given thermal and power constraints.
Design PRF
Design pulse repetition frequency average operations point.
Efficiency
Transmission efficiency of the lidar's optimal subsystems, expressed as a number between 0 and 1.
Beam Quality
Factor that expresses the accumulated wave front error for the entire optical path.
Conical Scanner
The beam is continuous scanned azimuthally at a fixed angle to nadir.
Step-stare
The beam is stepped, either clockwise or counter-clockwise through a conical scan, pausing at prescribed azimuth angles for prescribed dwell times.
Fixed Beam
The beam is pointed at a fixed azimuth angle relative to the platform.
Diameter Primary
The size of the primary telescope mirror.
Quantum Efficiency
Photonic to electronic conversion factor.
SHOT MANAGEMENT SCREENS:
For the CONICAL scanner,
Nadir Scan Angle
The slant path angle referenced from nadir.
Scan Rate
Revolution rate of the scanner.
PRF
Pulse repetition rate.
Cosine Modulation
Modulation switch applies a cosine modification to pulse timing during a conical scan.
For the FIX BEAM and the STEP-STARE BEAM
Number of Telescopes
The user may choose up to twenty telescopes placed in any sequence order.
The following indented inputs must be entered for each telescope:
Azimuth Angle
The azimuth angle for the dwell period referenced counter-clockwise from starboard.
Nadir Scan Angle
The slant path angle referenced from nadir.
Dwell Time
The length of time to stay at a fixed azimuth angle.
Dwell PRF
The PRF for the dwell period.
Gap Time
The length of time not to fire the laser between dwell periods for fixed beam scanners or the length of time to conically scan and fire the laser for step-stare scanners.
Gap PRF
The PRF for the step-stare scanner's conical scan period between dwell periods.
Directional Indicator
For the Step-stare beam only, a directional component (clockwise or counter-clockwise) of the conic scans between dwell periods must be entered for each telescope.
Cycle Period
The length of time before repeated the telescope pattern.
Pointing Jitter
Unrecorded high frequency variation in scanner.
The user can choose either Pulse-Pair Autocorrelation method or a Consensus Algorithm for signal processing.
Pulse-Pair Autocorrelation - Narrow-band SNR based
SNR error threshold
SNRn threshold used in the SNR weighting function.
Velocity Wind Maximum
Maximum atmospheric wind velocity measured Window.
Consensus Algorithm - Wide-band SNR
Velocity bandwidth
Maximum atmospheric wind velocity window.
Line-of -Sight Uncertainty
Line-of-sight uncertainty used for a signal that passed consensus.
| This page managed by Sidney A. Wood | Last modified: 21 Feb. 1998 |