Abstract
The objective of this paper is to present a microwave photonic system that can measure the angle of arrival (AOA) of multiple microwave signals with improved measurement accuracy. It is based on a photonic mixer approach to down convert the incoming microwave signals into IF signals, which enables a low-frequency electrical spectrum analyser to be used for measuring the power of the IF signals to determine the incoming microwave signal AOAs. AOA measurement errors can be reduced by operating the optical modulator at a different transmission point for a different range of microwave signal AOA. The system also has the ability to remove the incoming microwave signal amplitude dependence in the AOA measurement. Measured results demonstrate 0°−81.5° AOA measurement with less than ±2° errors over the 0°−30° and 30°−81.5° AOA measurement range when the optical modulator is biased at the minimum and maximum transmission point respectively. The errors remain below ±2° even when there is a ±0.1 dB change in the output IF signal power. AOA measurement of two microwave signals is also demonstrated.
Highlights
The direction from which the signal is received, which is known as the angle of arrival (AOA), is an important parameter in many military and civilian systems
The objective of this paper is to present a microwave photonic system that can measure the angle of arrival (AOA) of multiple microwave signals with improved measurement accuracy
It is based on a photonic mixer approach to down convert the incoming microwave signals into IF signals, which enables a low-frequency electrical spectrum analyser to be used for measuring the power of the IF signals to determine the incoming microwave signal AOAs
Summary
The direction from which the signal is received, which is known as the angle of arrival (AOA), is an important parameter in many military and civilian systems. Systems implemented using microwave photonics technologies have the ability to operate at high frequencies and over a wide frequency range with immunity to electromagnetic interference. They can provide multiple functions or measure multiple parameters in a single unit [4], [5] and have advantages of lightweight and remote antenna feeding [6]. Cao et al presents an AOA measurement system [7] where the power of the system output first order
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