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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
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Research article 05 Sep 2018

Research article | 05 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Novel specular meteor radar systems using coherent MIMO techniques to study the mesosphere and lower thermosphere

Jorge Luis Chau1, Juan Miguel Urco1, Juha Pekka Vierinen2, Ryan Andrew Volz3, Matthias Clahsen1, Nico Pfeffer1, and Jörg Trautner1 Jorge Luis Chau et al.
  • 1Leibniz Institute of Atmospheric Physics at the University of Rostock, Germany
  • 2UiT Arctic University of Norway, Norway
  • 3MIT Haystack Observatory, USA

Abstract. Typical specular meteor radars (SMRs) uses one transmitting antenna and at least a five-antenna interferometric configuration on reception to study the mesosphere and lower thermosphere (MLT) region. The interferometric configuration allows the measurement of the angle-of-arrival (AOA) of the detected meteor echoes, which in turn is needed to derive atmospheric parameters (e.g., mean winds, momentum fluxes, temperatures, and neutral densities). Recently, we have shown that coherent MIMO configurations in atmospheric radars, i.e., Multiple Input (transmitters) and Multiple Output (receivers), with proper diversity in transmission can be used to enhance interferometric atmospheric and ionospheric observations. In this study we present two novel SMR systems using multiple transmitters in interferometric configuration, each of them employing orthogonal pseudo-random coded transmitted sequences. After proper decoding, the AOAs of the detected meteor echoes with respect to the transmitter site are obtained at each antenna of the receiver site. We present successful implementations of (1) five transmitters and one receiver using coded continuous wave (CW) (MISO-CW), and (2) five transmitters and five receivers using coded CW (MIMO-CW). The latter system allows simultaneous independent observations of the specular meteor trails with respect to the transmitter and with respect to the receiver. The quality of the obtained results is evaluated in terms of the resulting mean winds, the number of detections and the daily diffusion trail versus altitude behavior. We show that the proposed configurations can increase the number of meteor detections, thereby improving the quality of atmospheric estimates, and obtain new atmospheric parameters (e.g., horizontal divergence, vorticity, etc.), particularly when combined with multi-static approaches. The use of multiple collocated transmitters for interferometric AOA determination makes building a multi-static radar network logistically easier, as only one receiver antenna is sufficient for interferometric measurements.

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Jorge Luis Chau et al.
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Jorge Luis Chau et al.
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Publications Copernicus
Short summary
New systems to study the mesosphere are introduced. They result from the re-engineering of previous systems, by making use of MIMO, spread-spectrum and compressed sensing techniques that are widely used in telecommunications. The interferometer configuration is now implemented in transmission, making the location of meteor echoes possible with just one antenna on reception. Our novel concept, makes feasible the study of a mesosphere volume from different viewing points on the ground.
New systems to study the mesosphere are introduced. They result from the re-engineering of...