Choosing a Push Broom Camera: Application Fit and Specification Checks for 0.5 m Resolution

How Push-Broom Imaging Works and Why GSD Matters

A push broom camera builds images by scanning a linear detector array in continuous strips as the platform moves. Unlike area-array cameras that expose a full frame in a single shutter click, this line-by-line approach delivers very high spatial consistency across wide swaths — making it the standard choice for satellite and airborne remote sensing that demands both coverage and fine detail.

The central performance metric is ground sample distance (GSD): a 0.5 m GSD means each pixel corresponds to a 0.5 × 0.5 m area on the ground. At this level, individual vehicles, narrow field boundaries, and roof-mounted infrastructure become distinguishable features. Missions that genuinely require sub-half-metre detail must verify this specification against their sensor; those that can work with coarser GSD should consider lighter, lower-power alternatives.

Astralink's 0.5 m Push-Broom Camera: Confirmed Specifications

Astralink Science and Technology Co., Ltd. manufactures the 0.5m-resolution Push-broom Camera (product code SC-CA-OC-102-01-PBC0.5m). Its confirmed published specifications are:

The five-band configuration — one panchromatic and four multispectral — provides meaningful spectral flexibility without adding complexity beyond what most mapping and land-cover missions require.

Seven Selection Criteria

Use the criteria below to decide whether this camera fits your mission. Each criterion is grounded in confirmed specification data.

1. Required Ground Resolution

Determine the smallest feature your mission must reliably detect, then work back to the GSD you need. The 0.5 m model resolves sub-half-metre detail. If your project requires only 0.75 m or coarser resolution, Astralink's 0.75m-resolution Push-broom Camera (SC-CA-OC-102-02-PBC0.75m) is a confirmed alternative: 10 kg, 85 W, a slightly wider ≥ 17 km swath, and an improved signal-to-noise ratio of 38 dB — relevant trade-offs when platform mass or power budgets are constrained.

2. Required Swath Width

Swath width governs how many passes are needed to cover a target area. The 0.5 m camera delivers ≥ 15 km at nadir. For very large-area collection tasks where fine spatial resolution is less critical, the 5m-Resolution Multispectral Camera (SC-CA-OC-102-04-MC5m) provides a 58 km swath in a single pass.

3. Spectral Requirements

• Panchromatic-only needs (structural inspection, vehicle detection): met by the 450–700 nm panchromatic band.
• Vegetation or land-cover analysis: the NIR band at 740–895 nm provides sensitivity for basic vegetation indices.
• Broader spectral depth: the 5 m multispectral camera covers 19 bands from 403 to 1 050 nm — suitable when extensive spectral discrimination matters more than fine spatial resolution.
• Buyers evaluating a push broom hyperspectral camera configuration should verify whether the five-band layout meets the band-count and bandwidth requirements of their analysis, or whether a dedicated hyperspectral payload is necessary.

4. Platform Mass Budget

The camera weighs 40 kg. Confirm that the satellite or airborne platform's payload mass allocation supports this. For reference, Astralink's own 0.5m-Resolution Satellite (approximately 90 kg) integrates a comparable push-broom imaging system. Platforms with tighter mass budgets should evaluate the 0.75 m model at 10 kg.

5. Power Budget

Power consumption is ≤ 190 W. Verify that the platform's power system can sustain this draw during imaging operations. The 0.75 m alternative consumes 85 W; the 5 m multispectral camera only 20 W.

6. Data Rate and Downlink Capacity

At 6.62 Gbps, the 0.5 m camera generates substantially more data than the 0.75 m model (2.13 Gbps) or the 5 m multispectral camera (2.5 Gbps). Before committing to this sensor, confirm that on-board storage and the ground-station downlink architecture can sustain this throughput. A mismatch here directly limits how much full-resolution imagery is recovered per pass.

7. Physical Envelope

The cylindrical body (Φ 770 mm × 1 430 mm) must fit within the payload bay or optical tube assembly. This is a hard mechanical constraint. The 0.75 m model at Φ 440 mm × 710 mm is significantly more compact; review fairing and structural accommodation early in the mission design phase.

Side-by-Side Comparison of Astralink Imaging Systems

The table below draws on confirmed specifications from Astralink's product range to support side-by-side evaluation:

Prices, delivery schedules, and export availability are not represented in this table and should be confirmed directly with Astralink Science and Technology Co., Ltd.

When This Camera Is the Right Fit — and When an Alternative May Be Better

Well suited for:

• Satellite or airborne mapping that mandates sub-metre spatial detail
• Urban change detection, precise cadastral surveys, and infrastructure monitoring
• Land-use classification combining panchromatic sharpness with multispectral band data
• Missions on platforms sized to carry a 40 kg, 190 W payload with 6.62 Gbps downlink support

Consider an alternative when:

• Platform mass is constrained well below 40 kg (the 0.75 m camera at 10 kg is the confirmed lighter option)
• Very large-area coverage per pass is the primary requirement (the 5 m camera's 58 km swath reduces mission time significantly)
• More than five spectral bands at sub-5 m resolution are needed
• The on-board or downlink architecture cannot sustain 6.62 Gbps

Pre-Procurement Checklist

Before requesting a quotation for the 0.5m-resolution Push-broom Camera, verify each of the following against your mission design:

1. Sub-0.5 m GSD is a firm mission requirement
2. ≥ 15 km nadir swath is sufficient per pass
3. Five spectral bands (Pan + Blue + Green + Red + NIR) cover the analytical workflow
4. Platform mass allocation supports 40 kg
5. Platform power system can sustain ≤ 190 W during imaging
6. On-board storage and downlink can handle 6.62 Gbps
7. Payload bay accommodates Φ 770 mm × 1 430 mm

All seven constraints must be satisfied for the camera to be an unambiguous fit. Where any constraint is not met, review the alternative cameras described above or contact Astralink Science and Technology Co., Ltd. for further engineering guidance.