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Arecibo Planetary Radar Implementation Tasks

Planetary Radar Implementation and testing

Arecibo Observatory

The following are my conception of what is required. Many of the pieces are contract requirements with which I am not completely familiar. This document is not a formal specification, and should not be relied on for any purpose except suggestion. Any corrections and improvements will be appreciated, and should be directed to Mike Nolan

Initial tests

Initially, there are a number of contract requirement tests, which will provide an initial set of required tests:

The turbine generator will meet its final acceptance test by providing power to operate the transmitter running into a dummy load.

Radiating tests

There are a few tests that can be run without pointing or focus:

Transmitter test

Can it put out power? Can the turret rotate between Transmit and Receive? This test probably comes under contract requirements.

Requires:

Leakage test

Transmit a signal (tone or spectrum?) and watch leakage into the receiver. This is the first test of a round trip signal through every part except a target. We need some leakage to do closed-loop tests, but we don't want to saturate the receiver, etc. There is some attenuation available upstairs ahead of the fiber (22 dB?), and we need to know if that is sufficient. If the is not enough leakage to do a close loop test, we need to arrange some. Parts of this test may come under contract requirements.

Requires:

Coded closed-loop test

Transmit a coded signal, and return leakage signal back down the signal path to be decoded. This test assures that a correctly coded signal can be cleanly brought through the system and dealt with. This test should really be run with different sampling systems: The hardware decoder, the Radar Interface running into a tape recorder, and the Mk IV Pulsar timing machine, used as a fast sampling system.

Requires:

Observational Tests

The following tests require a target, and therefore require:

CW Test

Acquire a CW spectrum of a planet (minor or major). There is at least one minor planet observable at a S/N of at least 30 in one day on any day through 1997 April. That's high enough for CW detection and probably ranging. After the equinox, the ecliptic (at midnight) moves south, and there are merely many opportunities. Major planets are also available at various times.

Additional Requirements:

Ranging test

This test will demonstrate the ranging ability, change of bauds, time dilation of the code due to changing range, and the monitor software.

Requirements: