GAMMA Remote Sensing AG GPRI-II User Manual Download Page 52 | Manualshive

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8. References

[1]

Werner C., T. Strozzi, A. Wiesmann, and U. Wegmüller, "GAMMA’s Portable Radar
Interferometer”, Procs. IAG – FIG Symposium Lisbon, Portugal, 12 – 15 May 2008.

[2]

Wiesmann A., C. Werner, T. Strozzi, and U. Wegmüller, "Measuring deformation and topography
with a portable Radar interferometer”, Procs. IAG – FIG Symposium Lisbon, Portugal, 12 – 15
May 2008.

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Summary of Contents for GPRI-II

Page 1: ...GAMMA Portable Radar Interferometer II GPRI II User Manual 16 Nov 2011 GAMMA Remote Sensing AG Worbstrasse 225 CH 3073 G mligen Switzerland www gamma rs ch...

Page 2: ...r best efforts in preparing this manual However the author and GAMMA Remote Sensing AG make no warranties of any kind expressed or implied with regard to the informational content documentation or fil...

Page 3: ...age List 21 4 2 Instrument Hardware 22 4 2 1 GPRI II Electronics 23 Chirp Generator 23 4 2 2 Antenna 25 4 2 3 Mechanics 26 GPRI II Antenna Tower 26 Tripod Positioner and Tribrach Leveler 26 Azimuthal...

Page 4: ...n py 44 6 5 5 gps_poweroff py 44 6 5 6 ima_poweron py 45 6 5 7 ima_poweroff py 45 6 5 8 rfa_poweron py 45 6 5 9 rfa_poweroff py 45 6 5 10 rx_poweron py 45 6 5 11 rx_poweroff py 45 6 5 12 tscc_status p...

Page 5: ...imaging no obstacle must be between the antennas and the target area during image acquisition at all shadow effects This transmitter must not be co located or operating in conjunction with any other a...

Page 6: ...s and the basic commands needed to operate the instrument Section 4 gives more detailed information on the instrument Section 5 gives insight in the communication interfaces Section 6 summarizes the i...

Page 7: ...ployed and obtain data with both high spatial and temporal resolutions that are particularly well suited to measuring rapid deformation Unlike orbital SAR systems in situ measurement permit flexibilit...

Page 8: ...gure 1 GPRI II fully assembled Instrument is aligned at 0 deg azimuth position 3 1 1 Leica heavy duty tripod Installation of the tripod is the first step in setting up the GPRI2 The tripod legs should...

Page 9: ...e tripod fully retracted and only extend the other 2 legs 4 Screw the feet through the hole in the tip to the ground using anchor screws 6mm anchors 5 Measure and note the extension of the legs for fu...

Page 10: ...n the tower mounting plate and mount the tower on the plate There is an alignment pin on the plate that makes sure that there is only one way to position the tower Screw the tower to the mounting plat...

Page 11: ...Antenna cable to the BNC connector The GPS receiver is located on the rotation axis of the tower Figure 9 RF Assembly mounted at the back of the Antenna Tower On the left side the GPS Antenna mounted...

Page 12: ...SMA connectors It is very important that these be pushed on gently and without being tilted relative to the connector axis or else they will be damaged Inspect the connector before each use to make s...

Page 13: ...is also possible to connect screen and keyboard after opening the Pelican case The GPRI2 supports two communication layers SSH Secure Shell and HTTPS Secure Web It is good policy to have also a logbo...

Page 14: ...nding measurement profile The profile contains information on the transmitter chirp angular scan speed and receiver attenuation See Table 1 for the description Depending on the maximum range you want...

Page 15: ...014l slc slc 20110714 20110714_084014l slc par mli 20110714 20110714_084014l mli mli 20110714 20110714_084014l mli par 5 1 rasmph_pwr int 20110714_084014l_20110714_084014u int mli 20110714 20110714_08...

Page 16: ...and from mnt ionice c2 n7 cp av Rosenlaui mnt Make sure you unmount the device at the end sudo umount mnt 17 Always do a positioner home run before you switch off the instrument home_run py 18 and shu...

Page 17: ...d for the scene When the images are satisfying repeat observation can be initiated preferably by adding the settings as a Repeat Task on the Scheduler Click the corresponding link Figure 16 So the num...

Page 18: ...Figure 12 Instrument Web Access Login Figure 13 Motor Status Accordion Panel Figure 14 Initial Measurement Control Tab...

Page 19: ...Figure 16 Measurement Settings The button starts the measurement as a single task the links allow to transfer the settings to the Repeat task Scheduler...

Page 20: ...Figure 17 Recurrent Task Menu Cron Interface Figure 18 Compute Interferogram Tab Figure 19 Main Menu...

Page 21: ...4 1 Instrument Components Package List The instrument consists of the following components 3 Fan Beam Antennas 1 RF Assembly Aluminum case 1 Instrument Computer yellow Pelican case 1 Power Cord black...

Page 22: ...on Newmark RMS 5S IP67 rotary stage Continuous scanning with a single sweep acquisition 10 deg sec 3 Slotted waveguide antennas 2 06m long beam 0 4 azimuth beam 37 5 deg elevation pattern 4 DDS contr...

Page 23: ...r avoiding stop start motion and the associated mechanical settling time The computer power supply ADC and stepper motor controller are all within the controller power assembly enclosure Temperature a...

Page 24: ...tance from the radar These two baseband channels are amplified and digitized at 6 25 MHz by 14 bit analog to digital converters ADC These ADCs are in the front end of the ETTUS USRP 2 Software Defined...

Page 25: ...as a coaxial line The receiver output goes directly to the input of the ADCs in the CPA enclosure 4 2 2 Antenna The GPRI II antenna is an end fed slotted waveguide antenna The azimuth antenna sidelob...

Page 26: ...crew that is standard and is adjustable to permit repeatable positionig A small bubble level embedded in the tripod mounting plate is used to ensure that the tripod itself is level within a few tenths...

Page 27: ...ach Red knobs adjust the tilt of the tribrach motor mounting plate Azimuthal Scanner Te GPRI II uses the Newmark RMS 5S azimuthal scanner This scanner uses a stepper motor with a 72 1 gear reduction T...

Page 28: ...d radar echo in the receiver The Ku Band Microwave Assembly KuMA contains a Transmitter TX and two Receiver modules RX The TX module accepts as input the chirp signal with a frequency range between 90...

Page 29: ...ower unit contains a 2 8 GHz Intel Core 2 Duo Processor T9600 on a Kontron KTGM45 mini ITX form factor CPU board with 4 GB RAM and 500 GB SATA disk An ATMEL micro controller switches the PC GPS and RF...

Page 30: ...tem services such as openssh and lighttpd and tools that are provided through the Ubuntu software repository are running Additional instrument specific software is provided through the GAMMA gpri2 Deb...

Page 31: ...gnome user interface is shown It allows full access on system settings in particular also the network settings 5 2 Graphical User Interface The graphical user interface can be accessed with any recen...

Page 32: ...Sensing v1 5 8 Aug 2011 clw usage gpri2_capture_utc py profile RAW_dir nraw start_T delta_T p slc_dir m mli_dir x d r rmin R rmax h heading a s scale e exp profile GPRI2 profile for raw data acquisit...

Page 33: ...rofile This profile is organized as keyword value pairs and described in Section 6 6 1 There are template profiles prf for different duration chirps 250us 500us 1ms 2ms 4ms and 8ms GPRI II data captur...

Page 34: ...d to check data quality That includes range profile analysis gpri2_plot py conversion of raw data to SLC gpri2_proc py and gpri2_proc_all py and MLI multi_look and visualisation raspwr and computation...

Page 35: ...ion Options h help show this help message and exit d DATA_TYPE data type DATA_TYPE Specify the data type float32 int16 default int16 o OFFSET offset OFFSET Specify record offset to begin display defau...

Page 36: ...quired for Along Track Interferometry default False e little_endian Generate little endian SLCs Gamma Software default is big endian default False h HEADING Heading of radar boresight clockwise from N...

Page 37: ...To further reduce range sidelobes this window is also applied at the end of the received data The e parameter sets the endian format for the floating point data with big endian standard for Gamma sof...

Page 38: ...the scan default 0 This script is used to process an entire stack of raw data to produce SLC images The script generates the arguments to call the processing program gpri2_proc py The input to the scr...

Page 39: ...RFA that supports 2 transmit channels H and V By default the transmit channel is V since the Ku data are all acquired with V transmit polarization For data acquired with alternating transmit polarizat...

Page 40: ...for the co registered image OFF_par input ISP offset interferogram parameter file interf output interferogram from SLC 1 and SLC 2R rlks number of range looks azlks number of azimuth looks loff offse...

Page 41: ...with cc values below cc_min are displayed using greyscale default 2 6 2 9 raspwr Compute image from MLI data DISP raspwr generate raster image of intensity image power law scale Copyright 2008 Gamma R...

Page 42: ..._005 raw_par raw_20110606 20110606_006 raw raw_20110606 20110606_006 raw_par raw_20110606 20110606_007 raw raw_20110606 20110606_007 raw_par raw_20110606 20110606_008 raw raw_20110606 20110606_008 raw...

Page 43: ...C_tab of the reference SLC 2 row number in SLC_tab of SLC 2 of the interferogram 3 line number in the itab 4 flag used to indicate if this interferogram is used for IPTA processing 0 not used 1 used M...

Page 44: ...10 6 4 5 stop_scan py Immediately stop motion of the tower even in the middle of an acquisition 6 5 Maintenance A collection of tools is available for instrument status monitoring and maintenance 6 5...

Page 45: ...12 tscc_status py program to print current TSCC status voltage input and temperature TSCC Software version SW V1 02 TSCC Voltage U1 23 8 TSCC Temperature C T1 31 3 6 5 13 tx_poweron py Turn on power t...

Page 46: ...0 digitizer It is important that the digitizer ADCs do not saturate A test data acquisition followed by examining the data with gpri2_plot py can confirm if saturation is occurring Saturation in the p...

Page 47: ...ord value If the start and end angles are the same then the duration of the ADC capture is specified by the ADC_capture_time parameter seconds The value of capture time should be set to 0 0 otherwise...

Page 48: ...specifies the transmitter mode The value None is used for the current Ku band GPRI For C band operation 3 modes are supported including H horizontal polarization transmit V vertical polarization tran...

Page 49: ...56752 3141 m number_of_state_vectors 0 GPRI_az_start_angle 93 33750 degrees GPRI_az_angle_step 0 10081 degrees GPRI_ant_elev_angle 10 00000 degrees GPRI_ref_north 46 68099000 GPS lat lon in the WGS84...

Page 50: ...coord are the positions of the antenna phase centers in the local tower coordinate system The origin of the tower coordinates is the intersection of the rotation axis and the central plane of the towe...

Page 51: ...Bandwidth 200 MHz maximum programmable Range resolution 1 0 meters with 200 MHz chirp and Kaiser window weighting Azimuth resolution 3 dB 8m 1 km proportional to slant range Analog to Digital conversi...

Page 52: ...A s Portable Radar Interferometer Procs IAG FIG Symposium Lisbon Portugal 12 15 May 2008 2 Wiesmann A C Werner T Strozzi and U Wegm ller Measuring deformation and topography with a portable Radar inte...

Page 53: ...Customer Site Name and Coordinates Date Weather Temp Wind Antenna elevation Tripod legs etc GPS Position Power Source Chirps TX_mode C Band RX IMAAttenuation Start Azimuth Stop Azimuth Start End Time...

Page 54: ...10 Demo Data Processing 10 1 Continuous Measurements 10 2 Repeat Measurements...

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