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## Coordinate Systems, Geometry, and Equations

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A two-dimensional, North-referenced coordinate system is the principal coordinate system used throughout this book. Figure 3.1 shows the coordinate system and parameters defining bistatic radar operation in the plane containing the transmitter (TX), receiver (RX), and target (Tgt). It is called the bistatic plane. The bistatic triangle lies in the bistatic plane. The distance L between the transmitter and receiver is called the baseline range, or simply baseline. The extended baseline is defined as continuing the baseline beyond either the transmitter or the receiver. The angles θT and θR are, respectively, the transmitter and receiver look angles, which are taken as positive when measured clockwise from North. They are also called angles of arrival (AOA) or lines of sight (LOS). The bistatic angle ß is the angle between the transmitter and receiver with the vertex at the target. Note that = θT - θR. It is convenient to use ß in calculations of target-related parameters, and θT or θR in calculations of transmitter or receiver-related parameters.

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