The flight test of Pi-SAR(L) for the repeat-pass interferometric SAR

Hitoshi Nohmi; Masanobu Shimada; Masanori Miyawaki

doi:10.1117/12.690357

3 October 2006 The flight test of Pi-SAR(L) for the repeat-pass interferometric SAR

Hitoshi Nohmi, Masanobu Shimada, Masanori Miyawaki

Proceedings Volume 6361, Sensors, Systems, and Next-Generation Satellites X; 63611I (2006) https://doi.org/10.1117/12.690357
Event: SPIE Remote Sensing, 2006, Stockholm, Sweden

Abstract

This paper describes the experiment of the repeat pass interferometric SAR using Pi-SAR(L). The air-borne repeat-pass interferometric SAR is expected as an effective method to detect landslide or predict a volcano eruption. To obtain a high-quality interferometric image, it is necessary to make two flights on the same flight pass. In addition, since the antenna of the Pi-SAR(L) is secured to the aircraft, it is necessary to fly at the same drift angle to keep the observation direction same. We built a flight control system using an auto pilot which has been installed in the airplane. This navigation system measures position and altitude precisely with using a differential GPS, and the PC Navigator outputs a difference from the desired course to the auto pilot. Since the air density is thinner and the speed is higher than the landing situation, the gain of the control system is required to be adjusted during the repeat pass flight. The observation direction could be controlled to some extent by adjusting a drift angle with using a flight speed control. The repeat-pass flight was conducted in Japan for three days in late November. The flight was stable and the deviation was within a few meters for both horizontal and vertical direction even in the gusty condition. The SAR data were processed in time domain based on range Doppler algorism to make the complete motion compensation. Thus, the interferometric image processed after precise phase compensation is shown.

Citation Download Citation

Hitoshi Nohmi, Masanobu Shimada, and Masanori Miyawaki "The flight test of Pi-SAR(L) for the repeat-pass interferometric SAR", Proc. SPIE 6361, Sensors, Systems, and Next-Generation Satellites X, 63611I (3 October 2006); https://doi.org/10.1117/12.690357

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KEYWORDS

Synthetic aperture radar

Antennas

Interferometry

Image processing

Global Positioning System

Interferometric synthetic aperture radar

Control systems

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