Update >Overview 2004
Radar Overview 2004 - Ultrawideband Accumulation Radar
- Maps internal layers to a depth of 200 m with 10 cm resolution
- Generates an extremely linear chirp signal with minimum variation
in transmit power for improved sidelobe performance
- Fast sweep rate.
- Compact PCI form factor
|Number of Coherent Integrations
|A/D Dynamic Range
||12-bit, 72 dB
The system has 5 modules, as follows:
- A Phase-Locked Loop system to generate the transmit signal.
- An Automatic Gain Control system to level the transmit power.
- A Phase-Locked Oscillator system to down convert the transmit signal.
- An RF receiver board.
- An IF receiver board (to match the received signal to the dynamic
range of the A/D converter)
FM-CW Radar Principles
In FM-Cw radar, a chirp signal is transmitted, hits a target and is
mixed with the transmit signal. If many targets are present, the IF
signal will be a superposition of many signals at different beat frequencies.
The beat frequency is B_/T and the resolution is c/2B.
The entire operational radar fits on one aluminum compact
PCI card and is placed in a compact PCI case along with the data acquisition
systems and the WCORDS system.
Delay Line Test
Corrected Spectrum (Blue) vs. Ideal Spectrum (Red) after
removing the delay line effects and the system effects.
Radar In Action - 2004 Field Experiment
Internal layers were successfully mapped at both NGRIP (2003) and Summit
(2004), Greenland with high resolution to a depth of 200 m.
The water-equivalent accumulation rate at Summit was determined to be