Deliverable 6.3: First version of an integrated performance specification

The integration of the initial Performance Specification document with the first version of the updated Science Case and the first version of the Handbook of Measurement Principles is a comprehensive Performance Specification covering the hardware and software elements of the new system, and showing how the science goals can be addressed:

The EISCAT_3D facilities will comprise one core site and four distant sites equipped with antenna arrays, supporting instruments, platforms for movable equipment and high data rate internet connections. Two pairs of distant sites with primary receiving capabilities will be located at different baseline distances within roughly 90 km ≤ d ≤ 280 km from the core site. The most favorable geometry for tri-static observation, for the four remote sites, is along two baselines, running orthogonally to each other from the central site. The core site with full transmitting and receiving capability will be located within roughly 100 km of a point at 69°N 20.5°E.

The mono-static core array consists of antenna elements having transmitting and receiving capability. Distributed receivers located added at close distance at the core site allow for testing bi-static measurements. This set-up allows modular construction as well as first scientifically exploitable results at an early stage.

The core site will comprise:

  • Phased-array of order of 10000 elements including both Tx and Rx capabilities
  • RF signal generation equipment and RF power amplifiers
  • Transmit/receive switching system
  • Beam-steering systems for transmission and reception
  • Incoherent scatter receiver subsystem
  • Outlier elements
  • Receive-only phased-array for narrow receiving beams and in-beam interferometry
  • Beam formers
  • Time and frequency synchronisation equipment
  • Digital signal processing equipment
  • Built-in test equipment

The total size of the central site will exceed 1 km, given that the dense inner core of antennas will be accompanied by a sparsely distributed array of outlying antennas.

The remote sites will comprise:

  • Phased-array antennas with associated receivers
  • Beam-formers
  • Time and frequency synchronisation equipment (performance clock and clock distribution systems)
  • Digital signal processing equipment
  • Built-in test equipment

The approximate size of a remote site will be around 300 m squared.

The transmitter parameters are:

Centre frequency
233 MHz (or < 233 MHz if need to be shifted)
Peak output power
10 MW
Average Power
2.5 MW
Instantaneous –3 dB power bandwidth
5 MHz
Pulse length
0.5–3000 microseconds or continuous
Pulse repetition frequency
0–3000 Hz (also irregular pulse sequences being possible)

The receiver parameters are:

Centre frequency
233 MHz (or centered around receiver frequency)
Instantaneous bandwidth
+/- 15 MHz at core site, preferably also at other sites at least +/- 5 MHz
Overall noise temperature
<50 K referenced
Cable length
not much longer than 5m
Spurious-free dynamic range
>70 dB