What does the concept of 'flat range' refer to in radar systems?

The concept of 'flat range' in radar systems primarily refers to equal distance resolution. In this context, it signifies that the radar system can discriminate between targets at varying distances with the same level of precision or resolution. Achieving flat range means that the system maintains consistent performance across different ranges, ensuring that targets can be detected and resolved equally well no matter how far they are from the radar. This characteristic is essential for effective radar operation, particularly in applications where targets may be present at diverse distances.

This contrasts with the other concepts mentioned. A low elevation angle pertains to the angle at which the radar beam is directed above the horizontal plane, which can influence target detection but does not specifically denote equal distance resolution. Uniform frequency response relates to how consistently the radar system responds to different frequencies, important for signal processing, yet it does not directly equate to distance resolution. Constant signal strength, while important in maintaining radar performance, doesn't guarantee that targets can be resolved equally at various distances. Thus, equal distance resolution serves as the foundational meaning of 'flat range' in radar technology.