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 (T_X), receiver (R_X), 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 θ_T and θ_R 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 = θ_T - θ_R. It is convenient to use ß in calculations of target-related parameters, and θ_T or θ_R in calculations of transmitter or receiver-related parameters.

Inspec keywords: geometry; radar signal processing; direction-of-arrival estimation

Other keywords: bistatic triangle; LOS; transmitter-related parameters; receiver look angles; two-dimensional North-referenced coordinate system; receiver-related parameters; bistatic plane; bistatic angle; bistatic radar; target-related parameters; lines of sight; angles of arrival estimation

Subjects: Radar theory; Combinatorial mathematics; Signal processing and detection